I7ctronic Industries

1955 WEST COAST ISSUE

WESCON SAN FRANCISCO

Au6ust 24 26

CO HARE THIS Route to Pleose August 1955

In 2 Sections Section 1 Caldw eli- Clements, Inc. www.americanradiohistory.com Using Ceramic Capacitors? Specify RMC DISCAPS Temperature Compensating Heavy -Duty

These DISCAPS meet all elec- RMC Type B "Heavy- Duty" R Sc trical specifications of the DISCAPS are designed for all RTMA standard REC- 107 -A. by -pass or filtering applications Small size, lower self inductance and meet or exceed the RTMA and greater dielectric strength REC -107 -A specifications for adapt them for VHF and UHF type Z5Z ceramic capacitors. applications. Type C DISCAPS Rated at 1000 V.D.C.W., Type are rated at 1000 working volts B DISCAPS cost no more than providing a high safety factor. lighter constructed units. Avail- Available in six sizes in all re- able in standard capacities be- quired capacities and tempera- tween 470 MMF and 40,000 ture coefficients. MMF.

Type JL

Type JL DISCAPS afford exceptional stability over an ex- The exclusive wedge design of tended temperature range. They the leads on these DISCAPS are especially engineered for .02 lock them in place on printed applications requiring a mini- circuit assemblies prior to the mum capacity change as tem- soldering operation. "Wedg- perature varies between -60 °C Loc" DISCAPS are available in and +110 °C. The maximum capacities between 2 MMF and capacity change between these 20,000 MMF in TC, by -pass extremes is only 4 7.5% of and stable capacity types. Sug- capacity at 25 °C. gested hole size is an .062 square.

High Voltage Plug -in Special high voltage DISCAPS RMC Plug -in DISCAPS will are available in a wide range of speed up production time in capacities for color television and printed circuit operations. Leads other electronic applications. are constructed of No. 20 tinned RMC DISCAPS for deflection copper (.032 diameter) and are yokes insure the voltage safety available up to 1 %" in length. factor required in this applica- Manufactured in TC, by -pass tion. They are available in all and stable capacity types, Plug - capacities between 5 MMF and in DISCAPS have all the elec- 330 MMF. trical and mechanical features of standard DISCAPS.

Write today on your company letterhead for expert engineering help on any capacitor problem.

DISCAP CERAMIC RADIO MATERIALS CORPORATION CAPACITORS GENERAL OFFICE: 3325 N. California Ave., Chicago 18, III.

FACTORIES AT CHICAGO, ILL. AND ATTICA, IND. Two RMC Plants Devoted Exclusively to Ceramic Capacitors

www.americanradiohistory.com In 2 Sections Section 2 August 1955 TELE -TECH E. Electronic Industries

1955 Directory of the West Coast Electronic Indus tries

This directory contains the latest and most complete alphabetical listing of some 462 leading manufacturers in the West Coast electronic industries. Each listing contains the company name, address, name of chief engineer or key person to contact, telephone number. The principal proprietary items (p) and avionic items (a) manufactured are also indicated. Companies preceded with an asterisk are Eastern or Midwestern firms with manufacturing facilities on the West Coast. This is the fourth con- secutive annual directory of the western electronic industries published by TELE -TECH & ELECTRONIC INDUSTRIES.

Acme Camera 2704 W Olive Ave Burbank Air Transport Mfg 1114 N Sycamore Ave American Elect Mfg Co 9503 W Jefferson Applied Physics 362 W Colorado St Pasa- Callflohn Kiel -VI 9 -3144 (p) TV Recdg Los Angeles 38 Calif -E L Hollywood 1r- Blvd Culver City Calif -1 Yablanka -TE dena Calif- Howard Cary-SY 6 -0197 (p) Cameras HO 7 -5175 (a) Harness Assemblies 0 -5581 (p) Control Motors Electrometers Acme Electric 1375 W Jefferson Blvd Los Allied Electronic Equip Bidg 604 Oakland American Helicopter Div Fairchild Engine & Arnoux Corp 1357 Hawthorne Blvd Haw- Angeles 7 Calif -RE 4 -3194 (p) Trans- Airport Oakland 14 Calif -E Crandall -LO Airplane Rosecrans Ave Manhattan thorne Calif -R W Hodgson -OS 5 -4483 formers 2-1400 (p) Headsets (a) Headsets 1800 Beach Measuring System (a) Temp Acousti Craft 14122 Aetna St Van Nuys Allison Labs 14185 Skyline Dr Puente Calif - Calif -Lewis Emmerich -OS 6 -1138 (p) Temp Calif -G L Burch -ST 6-0676 (p) Spkr C L Stevens -OX 4 -4056 (p) Passive Net- (p) Bridge Bal-nce Units Indicating Systems Enclosures work Filters American Microphone AM Elgin National Assembly Products Desert Hot Springs Adel Precision Products Div General Metals Aloha Radio 330 W Bdwy Long Beach 2 Watch 370 S Fair Oaks Ave Pasadena Calif -John Saint -Armour (p) Contact Corp 10777 Van Owen St Burbank Calif - Calif -H Putnam Best -747.16 (p) Marine Calif -1 Brown -SY 6-9008 (p) Micro- Meter Relays 1 W Kelly -SU 2 -1131 (p) Precision Air- Receivers phones Associated Missile Products 2709 N Gamey craft Equip (a) Precision Aircraft Equip Alpar Mfg 2910 Spring St. Redwood City Thermo -Electric 7269 Santa Ave Pomona Calif -R F CrispLY 4-0104 Advance Electric & Relay 2435 N Naomi St Calif -C B Parmenter -EM 8 -4701 (p) American Calif - Missile Prod- Burbank Calif -V C HuckabeeTH 2-8191 Cable Analyzer (a) Cable Analyzer Monica Blvd Los Angeles 46 (p) Tube Comparator (a) (p) Relays (a) Relays Altee Lansing 9356 Santa Monica Blvd Abraham Levy -HO 4-1632 (p) Vacuum uct Test Equip Aerovox Corp Pacific Coast Div 2724 Peck Beverly Hills Calif -Dr E M Honan -CR 5- Thermocouples (a) Vacuum Thermo- Audio Products 2265 Westwood Blvd In Rd Monrovia Calif - Morgan Harris -RY 5101 (p) Spkrs, Amplifiers (a) Trans- couples Angeles 64 Calif -F H Pruss -BR 2 -4266 1 -5621 (p) Amplifiers (p) Voltage Controlled Oscillators (a) formers Ampex Corp 934 Charter St Redwood City Airad Co Telemetering 5956 Hester Ave Van Nuys Calif - Alto Scientific 4037 El Camino Way Palo Calif -John Leslie -EM 8 -1471 (p) Tape Systems Geo Hewitt -ST 0 -2531 (p) Sheet Metal Allo Calif -L L Libby -DA 4 -4733 Avery Adhesive Label 1616 S California Ave (p) Recorders (a) Data Recorders Fabr Grid Dip Ose. Monrovia Calif -Harry Hoffman -EL 8 -2524 Electronics 1246 Folsom St San Airborne Electronics Co 6813 Troost Ave N Amelco Inc 2040 Colorado Ave Santa Applied (p) Pressure- sensitive Tapes Francisco 3 Calif -S S Konigsberg -MA Hollywood Calif -L W Cannon -PO 5 -1351 Monica Calif -G A CarlsonEX 3.7281 Avionex Electronics 2838 N Naomi St Bur Marine Radiotelephones (p) Test Equip (p) Continuity Meter 1 -2634 (p) bank Calif-I G Davidson -TH 2 -2381 (p)

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 1

www.americanradiohistory.com BUILDING BLOCKS

Monuluctu ing N Manufacturing, produ t development and re eorch Marwlacly ing and product development DIG îlot manufacturing, product development and research PRECISION N ,ECHANICS, OPTICAL DEVICES, CERAMICS N ON N N N 00 N MD OEM EL ECTRICAL EQUIPMENT and COMPONENTS 000 N N ELECTRONICS 0410 N N N N 000 0 HYDRAULICS, LIQUIDS PROCESSING, HEAT EXCHANGE 00 WW1 TELEVISION

Studio, Theatre, Educational, Business, Industrial - INSTRUMENTS, SERVOS, CONTROLS Hydraulic, Pneumatic, Magnetic, Electronic NON N AIRCRAFT and MI SILE GUIDANCE, CONTROL, SIMULATION ON ON N N 4100 AU 'OMATIC COMPUTERS and COMPONENTS 000 ON N RADAR, MICROWAVE, ULTRASONICS 000 N ON 00 OTION PICTURE and AUDIO EQUIPMENT 000 o.. N N NUCLEA R POWER COMPONENTS and CONTROLS 000 N SYSTEMS ENGINEERING Aeronautical, Naval, Industrial N/ N 11100

UZ aZ Op ZOZpW a

www.americanradiohistory.com une at a series telling how the producing companies of General Precision Equipment Corporation are contributing to America's progress. advanced techniques 8 resources

The producing companies of General Precision Equipment Corporation are engaged in the development, production and sale of advanced technological products. Each of these companies specializes in particular areas of advanced com- petence and possesses highly developed techniques and resources in its particular field or fields. These are the building blocks of GPE Coordinated Precision Tech- nology, through which GPE serves more than a dozen important industries. The chart at the left shows the areas in which each GPE Producing Company works. But it cannot show the high degree of specialization and the important position each GPE Company occupies in its field or fields.

The "Bullet" TV Camera; for industriol, institutional and educational use. Produces Take TELEVISION, for instance, and the work of useful pictures under conditions of poor light; General Precision Laboratory Incorporated, the GPE leader in feeds any TV receiver or monitor; unique packaging permits placement in ordinarily the field. LPL's research, development and manufacturing activi- inaccessible areas; unitized construction ties in TV are concerned with quality equipment for theatre, studio, business, with plug -in component chassis minimizes industrial, institutional and military TV and do not relate to the home TV field. maintenance requirements. ç GPL equipment was used for all video recording of the Coronation, both U. S. Intermediate Size and Canadian. It is by used 90% of the studios equipped for video recording. Projection TV System; q The first appearance of a President on closed- circuit TV- President Eisenhower projects bright, clear speaking from pictures on screens from the White House to distinguished guests at the dedication of the 3'x 4' to 9' to 12' Ford Research Center in Dearborn-was projected on GPL theatre equipment, Completely producing fine quality pictures up to (i5 feet wide. self -contained; easily transported; set up in Ç The same large- screen GPL equipment -and high quality, portable, intermediate matter of minutes; does size projection equipment newly developed by GPL-enabled guests assembled in not require skilled operator. Designed several separate ballrooms of the Waldorf- Astoria to see and hear the Queen especially for Mother at two New York dinners last Fall; made possible the historic 53 -city TV medium sized theatres, hook -up which was a feature of GM's fifty -millionth car celebration. Both these hotels, clubs, schools and auditoriums. types of GPL projection equipment also played key roles in the nationwide "heart - video-clinic" -the largest meeting of its kind ever held- attended by over 20,000 specialists in 35 cities. This GPL equipment is rapidly making closed- circuit TV a practical, everyday business and institutional meeting medium. (I Many broadcast studios, including CBS's famous TV 61 -the largest in the East, are exclusively equipped with GPL cameras and control equipment. Ç New uses are developing steadily for LPL's "Bullet," the new, portable, easily operated, industrial television camera: in banks to speed service, eliminate con- gestion and reduce personnel costs; in railroads to better control and speed train make -up and freight car loadings; in industry to monitor and improve manufac- Remote Control TV Camera; turing processes, for surveillance and security, and to view hazardous operations. for broadcast and industrial use. Pre -set control permits GPL is a leader in military TV with its special and exacting requirements for memory of 6 different shots.

airborne, shipboard and under -water uses and is also at work on color TV. A color Mounted on servo -operated . film camera chain of high pedestal, provides complete quality, for studio use, is in production and additional remote control of lens color equipment will be announced in 1955. selection, iris, pan and tilt. Highly useful A broad for observing description of the work of GPL and the other GPE Companies is dangerous phenomena; contained in the GPE brochure, "Serving Industry Through Coordinated Precision permits broadcasting Technology." For a copy, or other information, address: without use of cornera man.

General Precision Equipment Corporation 92 GOLD STREET, NEW YORK 38, NEW YORK

TELE -TECH & ELECTRONIC INDUSTRIZS August 1955 3

www.americanradiohistory.com 1955 Directory of West Coast Electronic Manufacturers

Tube Corp W Los Receivers (a) Control Panels Calvideo 5232 104 St Davis Electronics 4002 Burbank Blvd Bur - Electronic Production & Development 138 Ave Van Angeles 45 -S H -OR Babcock Radio Eng'g 7942 Woodley Calif Newton 8 -3979 Bank Calif -Bob Taylor -VI 9 -1815 (p) Nevada St El Segundo Calif -W M Thomas - -St 5 Cathode -Ray Tubes Nuys Calif -D A Gehlke -8648 (p) (p) Mobile Comm Equip EA 2 -1515 (p) D C Power Supplies Radio Guidance Control Equip (a) Radio Cannon Electric 3201 Humboldt St Los Daystrom Pacific Corp 3030 Nebraska Ave Electronic Products 322 State St Santa Angeles 31 Calif -Roger Bowen -CA Recurs & Transmitters 5-1251 Santa Monica Calif -D 1 Santogrossi -EX Barbara Calif -D E Hildreth -WO 5 -8541 Background Engineers 7313 Santa Monica (p) Connectors (a) Connectors 3 -6755 (p) Potentiometer (a) Floated (p) Plug -in Modules M Bodde Jr- Nuys Blvd Hollywood 46 Calif -B Canoga Corp 5955 Sepulveda Blvd Van Rate Gyro Electron Products 919 Riverside Dr Los Rear Projection Screens Calif -G E Hewitt -ST 7-1156 Ampli- HO 5-4161 (p) (p) De Coursey Eng'g Lab 11828 W Jefferson Angeles 31 Calif -1 G Stevens -CA fiers 6116 & Projectors Blvd Culver City Calif -S C Baden -EX 7- (p) Capacitors (a) Capacitors Bardwell & McAllister Div Hall Scott Motors Carad Corp 2850 Bay Rd Redwood City 9668 (p) Toroids (a) Low Pass Filters Electro -Pulse Inc 11861 Teale St Culver Calif -L H Calif -Wallace Burton -EM 8 -2969 (p) 2950 N Ontario St Burbank DeMornay- Bonardi Corp 780 S Arroyo Pkwy City Calif -1 S Johnson -TE 0 -8006 (p) Cooper -VI 9 -2341 (p> TV Lighting Equip Pulse Transformers (a) Filters Pasadena Calif -G Fonda -Bonardi -RY 1- Long Time Delay Generator Bartells Marine Radio 800 W Coast Hwy Carruthers & Fernandez 1501 Colorado Ave 7416 (p) Microwave Lab Test Equip (a) Electro- Switch & Controls 5755 Camilla A -LI 8- Santa Monica -F C Newport Beach Calif -1 Bartell Calif Fernandez -EX Radar Components Ave Culver City Calif -A T Beals -TE 0- 6242 (p) Marine Radiotelephones 4 -6768 (p) Solenoids (a) Solenoids Detectron Corp 5528 Vineland Ave N Holly- 4643 (p) Relays (a) Relays Rd El Carstedt Research Baughman Co E 1 1914 N Cogswell 8276 Phlox St Downey wood Calif -P F Swain -ST 7-0401 (p) Elgin -Neomatic Inc 9010 Bellanca Ave Los 0 Calif -Donald White -TO Monte Calif -E C Baughman -F0 -7586 9 -1091 (p) Counters (a) Radiation Survey lnstr Angeles 45 Calif -Ben McCannon -OR 3- (p) Microphone Booms Transformer Cores (a) Transformer Cores Detroit Controls Corp Research Div 1650 3814 (p) Relays (a) Relays Cascade Research Victory Lane Los Gatos Beckman Div Beckman Instruments 2500 53 Bdwy Redwood City Calif -H R Hulett - El Ray Motor Co 11747 Vose St N Holly- -1 F Bishop - Calif -1 S Jaffe -EL. 4 -9900 (p) Micro- Fullerton Rd Fullerton Calif EM 8 -5360 (p) Commutating Switches wood Calif -C H Adams -ST 7-1686 (p) OX 7-1771 (p) Measuring & Recording wave Load Isolators (a) Microwave Load (a) Commutating Switches Motors Isolators Instruments Deutsch Co 7000 Avalon Blvd Los Angeles Endevco Carp 689 S Fair Oaks Pasadena Carlos Ave Century Engineers 2741 N Naomi St Beckman & Whitley 985 San Bur- 3 Calif -C C Douglas -PL 1 -4131 (a) Calif -T C Woodward -RY 1-5231 (p) San Carlos Calif -E M Whitley -LY 3.7824 bank Calif -George Rice -TH 8-6614 (p) Connectors Measuring Instruments (p) Camera Controls (a) Guided Missile Simulation & Automation Systems Diacoustic Lab 4545 Encino Ave Encino Engineered Instruments 815 Sato St Hayward Chemalloy Electronics Gillespie Airport Destructors Calif-E C Knight -ST 4-0881 (p) Dia- Calif -D R Callow -1E 7 -1545 (p) Chokes Benchmaster Mfg 1835 W Rosecrans Ave Santee CalifSamuel Freedman -H 1 4.7661 mond Pivot Bearings for Guided Missiles Coils (p) Microwave Gardena Calif -1 A Matzdorff -PL 6 -8134 Calorimeters (a) Micro- (a) Diamond Pivot Bearings for Guided Essex Electronics 7303 Atoll Ave N Holly- wave Calorimeters Missiles (p) Punch Presses wood Calif -W 1 Hirschberg -St 7 -5451 Bendix Aviation Pacific Div 11600 Sher- Chromatic TV Labs West Coast Develop- Digital Products 7643 Fay Ave La Jolla (p) Coils (a) Encapsulated Assemblies ment Lab 1476 man Way N Hollywood Calif -C D Perrine- 66 St Emeryville 8 Calif -G S MacDOnnell -GL 4 -7216 (p) CalifC S NananPI 5 ST 7 -2651 (p) Radar, Telemetering, -8081 (p) Color Etched Circuit Boards Faber Mfg Merle 35 Stillman St San Fran- CR Picture Tubes (a) Color CR Tubes Dileetron Sonar Div Gudeman Co 2661 S Myrtle cisco 7 Calif -M F Faber -EX 2 -7302 (p) Cinema Eng'g Co Div Aerovox Bendix Aviation Bendix Computer Div 5630 Corp 1100 Monrovia Calif -F T Reischel -DO 6-3101 Vacuum Tube Components -Dr Chestnut St Burbank -Chas Broneer- Arbor Vitae St Los Angeles 45 Calif Calif (p) Capacitors (a) Capacitors Feay Co Neal 427 Olive St Santa Barbara Digital Com- VI 9 -5511 (p) Amplifiers Dollar Co Robt O C Evans -OR 8 -2128 (p) Comm Equip Div 50 Drum Calif -Jerry Kucera -WO 2 -0722 (p) Dials, Circon Component Co 17544 Raymer puters St St San Francisco 11 Calif -R W Bruce - Panels, Scales (a) Dials, Panels, Scales Northridge Calif -D B O'Rork -DI Bennett Laboratories 2700 Bay Rd Redwood 3-3089 YU 2 -4479 (p) Audio Comp Federal Equipment 38 Brady St San Fran- (p) Connectors (a) Instr Hardware Donner City Calif -A E Bennett -EM 6 -6845 (p) Scientific Co 2829 7 St Berkeley 10 cisco 3 Calif -R W Randolph -UN 3 -3607 Clark Electronic Labs P TV Optical Filters 0 Box 165 Palm Calif -Dr V B Corey -TH 5 -3150 (p) (p) Photoelectric Traffic Counting Equip Springs Calif -D B Clark -8 Bennett Products P 0 Box 1055 Palo Alto -3011 (p) Analog Computer (a) Servo Accelerometer Ferraprint 7070 Santa Monica Blvd Holly- Silicon Rectifiers (a) Rectifiers Dressen Barnes Calif -John DodenhoffYO 7-7249 (p) Corp 250 N Vineda Ave wood 38 Calif -S G Ellis -HO 9 -8374 (p) Clary Corp 408 Juniro Hermetic Compression Seals (a) Rocket St San Gabriel Pasadena 8 Calif -B F McNamee -SY 3- Magnetic Sound Recording Tape Calif-Fl E Boyden -CU 3 -2724 (p) Read- Hermetic Seal Components 0691 (p) Regulated Power Supplies (a) Fischer & Co R A 517 Commercial St Glen- out Machines & Keyboards Benson -Lehner Corp 2340 Sawtelle Blvd Input Regulated Power Supplies dale 3 Calif -Ralph DeVries -CH 5-2404 Beam Antenna Los Angeles 64 CalifB S Benson -BR Clear 21341 Roscoe Blvd D & R Ltd 402 E Gutierrez St Santa (p) Transformers Canoga Park Calif -Jerry Fisher 2 -1198 (p) Oscillograph Trace Readers -DI 7- Barbara Calif -G M Kingman -WO 5 -4511 Fisher Research Lab 1961 University Ave 2255 (p) TV Antennas R (a) Oscil lograpn Trace Headers (p) -F Equip (a) High -Freq Power Palo Alto Calif -G F Fisher -DA 2 -4646 Berkeley Div Beckman Instruments Inc 2200 Coast Coil Co 5333 W Washington Blvd Los Altern tors (p) Measuring Instruments M Angeles 16 Calif -C H Adams -WE 4 Duncan-Rohne Wright Ave Richmond Calif -W Harger- -0442 11310 Sherman Way N Fluke Mfg Co John 1111 W Nickerson St (p) Toroidal Windings Hollywood LA 6 -7730 (p) Counters & Timers (a) Calif -D D Malcomb -ST 7 -3433 Seattle 99 Wash -1 M Fluke -AL 3322 (p) Analog Computers Coleman Eng'g 6040 W Jefferson Blvd Los (a) Radar Wave Guides Wattmeter (a) Wattmeter Angeles 16 Calif -E A Gardner -TE Dynamic Berlant Instruments 4917 W Jefferson Blvd 0.6931 Air Eng'g 7512 Male Ave Los F & M Sales 1054 Cahuenga Blvd Holly- (p) Analog -to- Digital Los Angeles 16 Calif -Paul Letl -RE 1- Converters Angeles 1 Calif -1 Lowrey -LU 8.3292 (p) wood 38 Calif -Harold Furno -HO 3 -1959 2141 (p) Magnetic Tape Recorders (a) Collins Radio 2700 W Olive Ave Burbank Blowers (a) Blowers (p) Crystal Processing Equip Calif -VI 9-3361 (p) Comm Equip (a) Data Recorders Dynamic Analysis Inc Box 2188 So Annex Ford Eng'g Co 129 East A St Upland Calif - Comm Equip Van Nuys Berndt -Bach Auricon Div 6926 Romaine St Calif -W Woodson -ST 6 -2301 R L Gach -YU 322 (p) Potentiometers Color Television E Carlos Ave Hollywood 38 Calif- Walter Bach -HO 2- 973 San San (p) Analog Computers Furane Plastics 4516 Brazil St Los Angeles 0931 (p) Sound -On -Film Recording Mag- Carlos Calif -John Adkins -LY 3 -8466 (p) 39 Calif -Julian Delmonte -CH 5 -1153 (p) Test Equip (a) Equip netic & Optical Motion Picture Cameras Test Potting & Encapsulating Resins (a) Research Edcliff Instruments Jack Scientific Instrument 143 S Cedros Computer Corp 3348 W El Segundo 383 N Foothill Blvd Tooling Resins Bill Pasadena Ave Solana Beach Calif -U A Patchett -SK Blvd Hawthorne Calif -H H Sarkissian- 8 Calif -E H Rehnborg -SY 6- 5-1551 (p) Servo Torque Units (a) OS 5 -1171 (p) Computers 3302 (p) Linear Motion Pot (a) Linear Motion Pot Camera Control System Connector Corp of America 3223 Burton Garrett Corp AiResearch Mfg Div 9851 Eeco Production Birtcher Corp 4371 Valley Blvd Las Angeles Ave Burbank Calif -R R Thomas -VI 9- Co 827 S Vermont Ave Los Sepulveda Blvd Los Angeles 45 Calif 2129 Connectors Angeles 5 32 Calif -C J Birtcher -CA 2 -9101 (p) (p) Calif-lay Temple -DU 5-3026 W R Ramsaur OR 8-9211 (p) Computers Medical Equip Conrac Inc 19217 E Foothill Blvd Glen- (p) Plug -in Units (a) Strain Gage (a) Servo Systems Amplifier Pia) Bone Eng'g Corp 701 W Broadway Glendale dora Cailif -J G Jones -ED 5 -1241 (p) -I General Cybernetics 1751 N Coronado St Custom TV Chassis 4 Calif -Myron Orbaugh -CI 1 -5442 (p) Eitel -McCullough 798 San Mateo Ave San Los Angeles 26 Calif -Geoffrey Post -NO 3- Fuel Flow Test Stands & Meters (a) Consolidated Eng'g 300 N Sierra Madre Bruno Calif- Gordon Howes -JU 8-1212 (p) 1300 (p) Card to Tape Converter (A) Flowmeter Calibration Equipment Villa Pasadena Cailf- Joseph Lancor -SY Power Vacuum Tubes (a) Power Vacuum Linear Displacement Transducer Bourns Laboratories 6135 Magnolia Ave 6 -0173 (p) Data Processing & Record- Tubes Genisco Inc 2233 Federal Ave Los Angeles ing Recording Riverside Calif -M E Harrison -OV 4.1700 lnstr (a) Oscillographs Mum Corp 9844 Reiner St El Monte Calif - 64 Calif -R E Brown -BR 2 -9749 (a) (p) Trimmer Potentiometers (a) Trimmer Control Specialists 115 E Arbor Vitae St Dan Simkins -FO 0-7077 (p) Neon Indi- Accelerometers Potentiometers Inglewood 1 Calif -I L Ashkenas- OR 8- cator Lights (a) Neon indicator Lights Gertsch Products 11846 Mississippi Ave Los Braunson Electronics 411 Rose Ave Venice 4688 (p) Analog Computer (a) Flight Electrical Communications 765 Clementina Angeles 25 Calif -L S Cutler -BR 2-0568 Control Systems Calif -R 0 Bronson -TE 0 -1825 (p) Sole- St San Francisco 3 Calif -E H (p) Frequency Meters (A) Frequency Div Dynamics Cogill- noids (a) Solenoids Convair General Corp 3165 KL 2 -1947 (p) Radio Pulsing Meters Pacific Hwy Diego Unit Brubaker Electronics Inc 9151 Exposition Dr San 12 Calif-II C Electrical Giannini & Co G M 918 E Green St Pasa- Seboid -CY 6 (p) Special Cathode Facilities 4224 Holden St Oak- Los Angeles 34 Calif -R V Keeran -TE -6611 land -Fred dena 1 Calif -C F Sardou-SY 3-2101 (p) Ray Tubes (a) Guided Missiles 8 Calif Krauss -OL 3-1661 0.6441 (p) Delay Lines (a) Radar Selenium Potentiometers (a) Pressure Transmitters *Cornell ()Oilier Elec Corp West Coast Div (p) Battery Chargers (a) 400 Systems Cycle Transformers Chard- Hopkins 1000 40 Ave Oakland 1 4144 Ocean Park Ave Venice -P M Burnell & Co Pac Div 720 Mission St S Calif Electrocircuits Calif -1 C Hopkins -KE 2-8477 (p) Ca- Kuefier -TE 0 Capacitors Inc 401 E Green St Pasa- Pasadena Calif -L G Burnell -PY 12841 -6681 (p) (a) pacitors (A) Capacitors Capacitors dena 1 Calif -B F Grimm -SY 3 -8169 (p) (P) Band Pass Filters (a) Sub Miniature Potentiometers (a) Potentiometers Glass Eng'g Labs 601 O'Neill Ave Belmont Crawford's Inc N Rodeo & Toroids 456 Dr Beverly Calif -H M Warden -LY 3-8276 (p) Filters ElectroData Corp 717 N Lake St Pasadena Radio Lab Wm W L 4814 Idaho St Hills Calif -Fred Nussbaum -CR 1-8124 Specialized Glass Products Burnett 6 Calif -L P Robinson -SY 8-6761 (p) San Diego 16 Calif -Wm W L Burnett -AT (p) TV Receivers Globe Electrical Mfg Co 1729 W 134 St Eng'g 10816 Data Processing Machines 2.2740 (p) Piezo- electric Crystals, Hold- Creative Burbank Blvd N Gardena Calif -Alex Glassman -PL 7 -1881 Hollywood -R Blaine Electro Development Co Keswick ers & Ovens Calif F -ST 7-4759 14701 St (p) Relays Antennas Antennas Van Nuys Calif-F1 L Burton Mfg. 11201 W Pico Blvd Los (p) (a) Finch -ST 6 -3660 G & M Equipment 7309 Varna Ave N Holly- Crescent Eng'g & Research Slip Ring Assemblies Precision Angeles 64 Calif -E A Pecker BR 2 -3445 11632 McBean (p) (a) wood Calif -Steve Taylor -PO 5 -4185 (p) St El Monte Calif -G S Van Sickle -FO Components (p) zirconium Arc Lamps & Power Sup- 0- Spectrum Analyzer (a) Spectrum Analyzer (p) Electro Instruments Rosecrans plies (a) Measuring Instruments 8882 Transducers (a) Position 3794 San Goldak Co 1544 W Glenoaks Blvd Glen- Transmitters Diego 10 Calif -Jon Edwards-CY 8 -6144 Byron Jackson Co Electronic Div 2010 dale 1 Calif -Edwin Kaufman -CH 5 -6571 Crittenden Transformer Works 1220 Nadeau (p) Digital Voltmeter (a) Digital Volt- Lincoln Ave Pasadena 3 Calif -) E Stan - (p) Relay Amplifier (a) Relay Amplifier St Los Angeles 1 Calif -R M Power -LU meter key-RY 1 -7134 (p) Signal Generators Gonset Co 801 S Main St Burbank Calif - 8-6173 (p) Transformers Electro- Measurements 4312 S E Stark St (a) Digital Pressure Gauges W W Smith -VI 9 -2222 (p) Comm Equip Crosby Enterprises Bing 9028 Sunset Blvd Portland 15 Ore -M L Morgan -FI 9235 (a) VHF Radio Equip Los Angeles 46, Calif -F C Healey -CR 1- (p) Impedance Bridges (a) Potentiom- Good Inc Don 1014 Fair Oaks S Pasadena Caibest Eng'g & Electronics 828 N High- 1171 (a) Airborne Magnetic Tape Equip eters Calif -Don Good -PY 1-1884 (p) Wire, land Ave Hollywood 38 Calif- Herbert Cryco Inc 1138 Mission St S Pasadena Electro- Mechanical Specialties 6819 Melrose Cable Fremont -HO 3 -2119 (p) Amplifiers Calif -E W Johnson -PY 1 -1174 (p) Freq Ave Los Angeles 38 Calif -1 P Schwartz - Gordon Enterprises 5362 N Cahuenga Blvd Califone Corp 1041 N Sycamore Ave Holly- Control Crystals WE 3 -5866 (p) Relays (a) Relays N Hollywood Calif -W W Low -ST 7-5267 wood 38 Calif -R G Metzner -HO 2 -2353 Cubic Corp 2841 Canon St San Diego 6 Electromec Inc 5121 San Fernando Rd Los (p) Photo Processing Equip (a) Camera (p) Phonographs Calif -L G Dameson Jr -AC 3 -8191 (p) Angeles 39 Calif -C M Brown -CH 5-3771 Test Panel Calif Chassis 5445 E Century Blvd Lyn- Calorimetric Wattmeters (a) Distance (p) Oscilloscopes Goslln Electric & Mfg 2921 W Olive St Measuring Equipment wood Calif -W S NcNeal -NE 6 -7777 (p) Electronic Control Systems 2136 Westwood Burbank Calif -A J Goslin -TH 8-0776 (p) Chassis, Cabinets Culbertson Co G K 2515 Novato PI Palos Blvd Los Angeles 25 Calif -A F Brewer -BR Transformers Verdes Calif Magnetic Control 7245 Atoll Ave N Estates Calif -G K Culbertson - 2-0845 (p) Statistical Analyzer (a) Graef Eng'g Co 15010 S Downey Ave Para- Hollywood Calif -H C Hornickel-ST 7- FR 5 -6062 (p) Record Players Data -handling Systems mount Calif -0 K Graef -NE 6 -2816 (a) 1104 (p) Transformers, Inductors, Coils Electronic Eng'g Co of Calif 180 S Alvarado Insulators, Coil Forms (a) Transformers, Inductors, Coils St Los Angeles 57 Calif -R B Bonney -DU Graphik- Circuits Div Cinch Mfg 221 S Calif Plasteck Inc 225 E 4 St Los Angeles Dallons Laboratories 5066 Santa Monica 2-7353 (a) Data Handling Systems Arroyo Pkwy Pasadena 1 Calif -H R Gil- 13 Calif -1 N Dupree -MA 9 -3561 (p) Blvd Los Angeles 29 Calif -Franz Dallons- Electronic Industries 7649 San Fernando Rd lespie-BY 1 -9667 (p) Printed Circuit Annunciator Panels (a) Panels, Dials, NO 4 -1951 (p) Crystals Burbank Calif -W T Holmes -ST 7 -8546 Boards (a) Printed Circuit Boards Nameplates Dalmotor Co 1375 Clay St Santa Clara (p) Radiation Detecting Equip Gudeman Co of Calif 2669 S Myrtle Ave Caltron Products 1310 5 Hobart Blvd Los Calif -Karl Hummel -AX 6 -5958 (a) DC Electronic Mfg 227 W Chestnut Ave Mon Monrovia Calif-O H Allen -RY 1 -9364 Angeles 6 Calif -Leo Klein- RE 4 -6144 Miniature Motors rovia Calif -A H Fester -EL 8 -6149 (p) (p) Pulse Transformers (a) Pulse Trans- (p) Solenoid Valves Dalmo Victor Co 1414 El Camino Real Environmental Testing Equip formers Cal- Tronies Corp 11307 Hindry Ave Las San Carlos Calif -W F Gates -LY 3-3131 Electronic Organ Arts Box 41084 Los Guild Radio & TV 460 N Eucalyptus Ave Angeles 45 Calif -R H Floyd -OR 1-7694 Wave & RF Components (a) Angeles 41 Calif -R L Eby -SY 3-9367 Inglewood 3 Calif -H Fremont -OR 8-7771 (p) Test Equip (a) Slideback Voltmeter Radar(p) Antennas^noise (p) Electronic Organ Kits (p) Radios

4 TELE -TECH & ELECTRONIC INDUSTRIES August 1955

www.americanradiohistory.com NAVIGATION SYSTEMS Kearfott Systems include 3 gyro, 3 and 4 gimbal platforms. They provide precise azimuth and vertical reference. Also The Gyro Guide System shown provides Latitude Corrected Gyro and Magnetic Slaved Heading Directional Gyro Compass information. Weighs 17 lbs. Max. random drift 2° /hour. Systems. -FROM THE EAST COAST ------GYROS, SERVO MOTORS, SYNCHROS

SERVO MOTORS, SYNCHROS Kearfott produces a FLOATED INTEGRATING GYRO complete line of gyros, High torque, low inertia Servo motors, Servo- 3 Gyro Platforms, Floated Rate Integrating motor- Generators, inertial and viscous damped servo motors, and synchros Gyros, Vertical, Free, Directional, Rate Gyros Servo motors 3r4" to 1.3/4" diameter, Synchro to satisfy every aircraft and Gyro operated rate switches- compact, Transmitters, Control Transformers, Resolvers, lightweight, control requirement. hermetically sealed. Repeaters and Differentials in size 8, 11 and 15. AND FROM THE WEST COAST ------

MICROWAVE EQUIPMENT

Kearfott offers engineering- design service, manufacturing facilities and a wide experience in the TEST SETS (for X, C, and Ka) of microwave production COMPONENTS A four -in -one instrument for func- components and test sets. tional testing of radar or beacon. Including attenuators, directional cou- Includes Wavemeter, Spectrum Ana - piers, crystal mixers, twists and tees lyzer, Power Monitor, and signal for S, C, Xb, X and Ku bands. generator.

Bulletins giving physical and technical data on the various Kearfott Products will be sent on request. The Kearfott organization is available co assist in the development and manufacture of other precision components you may require.

KEARFOTT COMPANY, INC., Little Falls, N. J. Sales and Engin ring Offices: 1378 Main Ave., Clifton, N.J. Midwest Office 188 West Randolph Street, Chicago, Ill. South Central. frite:. 6115 Denton Drive, Dallas, Texas .. West Coast Offi : 253 N. Vinedo Avenue, Pasadena, Calif. WEST RN MANUFACTURING DIVISION: A SUBSIDIARY OF GENERAL 148 Oxnard Street, Van Nuys, Calif. ELI - PRECISION EQUIPMENT CORPORATION

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 5

www.americanradiohistory.com 1955 Directory of West Coast Electronic Manufacturers

Corp W 67 St Nelson Vacuum Pump Geo F 2133 4 St Hadley Co Robert M 5112 S Hoover St Los Javex P 0 Box 646 Redlands Calif -C 1 McCOlpin- Christie 3410 Angeles -S L Christie Berkeley 10 Calif -H A Alston -AS 3 -2277 -A H Hadley -AD 4 -0131 Reimuller -4 -5752 (p) TV Installation Los 43 Calif -PL Angeles 37 Calif Pumps (p) Transformers, Reactors Equip 3 -2607 (p) D C Power Supplies (A) (p) Vacuum Pumps (a) Vacuum Hallamore Electronics 2001 E Artesia St Jennings Radio Mfg 970 McLaughlin As D C Power Supplies Networks Electronic Corp 14806 Oxnard St Calif- Herbert Karsh -20- San lose Calif -1 E Jennings -CY 2 -4025 McCormick Selph Assoc P 0 Box 6 Hollister Van Nuys Calif -Mike Patrichi -ST 5 -8805 Long Beach 5 -Frank 1428 (p) Closed Circuit TV (a) Trans- (p) Vacuum Capacitors (a) Vacuum Calif LaHaye -1185 (p) Explosive (a) Delay Lines ponder Capacitors Actuator Devices Neucor Inc 45 W Union St Pasadena Calif - McKenna Labs 2503 Main Hallen Corp 3503 W Olive Ave Burbank Jobbins Electronic Enterprises 771 Hamilton St Santa A T Anderson -SY 3 -2316 (p) Oscillators CalifRoger Anthes -TH 8 -6976 (p) Ave Menlo Park Calif -C W Jobbins-DA Monica Calif -A G McKenna -EX 9 -8846 (a) Oscillators Magnetic Film Recorder /Reproducers (a) 2 -7661 (p) Transformers (p) Ultrasonic Cleaning Equip (a) Ultra- Newcomb Audio Products 6824 Lexington Ave Magnetic Film Recorder /Reproducers Johnson -Williams Inc 2625 Park Blvd Palo sonic Cleaning Equip Hollywood 38 Calif -Donald Warner -HO 9- McLaughlin Corp 1 L A Hallett Mfg Co 1601 W Florence Ave Ingle Alto Calif -K W Johnson -DA 2 -1531 (p) 367 Bird Rock 5381 (p) Sound Equip Ave Del wood Calif -Harry Shore -OR 8 -4751 (p) Gas Detectors (a) Icing -Severity Indica- La Jolla Calif -1 L A McLaughlin -GL Non Linear Systems Del Mar Airport Interference Control Equip (a) Interfer- tors 4 -0141 (p) Radio Receivers (a) Tele- Mar Calif -A F Hay -SK 5 -1134 (p) Dig- metering Receivers ence Control Equip ital Voltmeters (a) Digital Voltmeters Hansen Electronics 7117 Santa Monica Blvd Kaar Eng'g P 0 Box 1320 Palo Alto Calif - Masson Co 3260 Motor Ave Los Angeles 34 North American Aviation 12214 Lakewood B -DA Radio Calif -1 D MacDonald Los Angeles 46 Calif -H R Hansen -HO 9- A Simpkins 3 -9001 (p) -TE 0 -3000 (p) Blvd Downey Calif -S H Nelson -LO 5-8651 3052 (p) Tape Resistors (a) Tape Re- Telephones (a) Radio Transmitters Cable Connectors (a) Guided Missile Systems Kahl Scientific Instrument P 0 Box 1166 El Mag- Electric Products 12822 Yukon Ave sistors North American Instruments 2420 N Lake Cajon Cal if -G WolterHI 4 -5944 (p) Hawthorne Calif -R L Phillips-OR 8 -6248 Harder Co Donald C 3338 India St San Ave Altadena CalifP S Chase -SY 8 -1145 Electrical Thermometers (p) Mag Regulators & Power Diego 1 Calif -D C Harder -CY 8 -2180 (p) Supplies (p) Freq Meter (a) Pressure Transducers Winder (a) Toroidal Coil Kaiser Aluminum & Chemical 1924 Broad- (a) Mag Regulators & Power Supplies Toroidal Coil Northrop Aircraft 1001 E Broadway Haw- Winder way Oakland Calif -M D Eisele -TA 3 -4600 Magna Electronics 9810 Anza Ave Inglewood 1 Calif- George Gott -OR thorne Calif -Edgar SchwundOB 8 -9111 Helipot Corp S Pasadena Calif -0 C Oldler- (p) Capacitor Foil 8 -5675 (p) Audio Amplifiers (a) Weapon Systems PY 1.2164 (p) Potentiometers (a) Po- Kartron 7882 Kartron St Huntington Beach tentiometers Calif -T B Linton -LE 9 -4606 (p) Magnasync Mfg 5523 Satsuma Ave N Holly- wood Calif -1 W GreenST Bled Hollywood Hewlett - Packard Co 275 Page Mill Rd Palo Shorted Turn Indicators 7-5493 (p) Oberline Inc 6411 Hollywood Alto Calif- Brunton BauerDA 5 -4451 (p) Kay Lab 5725 Kearney Villa Rd San Diego Magnetic Film Recorders /Reproducers 28 Calif- Oliver Berliner -WE 3.9128 (p) Test Equip 12 CalifR E Langworthy -BR 7.6700 Magnavox Research Labs Dis Magnavox Co Audio Equip 2255 Ave Los Hoffman Laboratories 3761 S Hill St Los (p) DC Power Supplies Carmelina Angeles 64 O'Brien 6514 Santa Monica -Dr R Thorensen Angeles Calif -Carlton Wasmansdorff -RI Kearfott Co Western Area Office 253 N Calif -GR 9 -7796 (p) Hollywoode 38 ai ewa 4.1117 7 Data Communications & Radar Vinedo Ave Pasadena 8 Calif -1 R Hark - Processing Systems (a) Missile (p) Sound Systems 7-9661 (p) Hol- Equip (a) Navigation Equip ness-SY 6 -9139 (p) Gyros, Synchros (a) Guidance & Flight Control Systems Olesen Co Otto K 1534 Caheenga Blvd Hoffman Radio Div Hoffman Electronics Navigational Systems Magnetic Research 200 Center St El Segundo lywood 28 Calif -S S Romans -HO 5.5194 2606 Redwood Calif -Dr Hugo H Waerdemman -OR Corp 3761 S Hill St Los Angeles 7 Calif - KF Development Spring St 8 -8921 (p) Sound Consoles -Paul 8 (p) DC Magnetic Power Blvd Los M G Whitney -RI 7 -9661 (p) Radio & City Calif Keeler-EM -5670 (a) Supplies (a) Olympic Plastics 5741 W Jefferson DC Power TV Receivers Potentiometers Supplies Angeles 16 Calif -Willard Lundberg -TE Kinevox Inc 116 S Hollywood Burbank Mann Co Wm 1 104 E Foothill Blvd (a) Ter- 14011 Audio Inc 5020 N Encinita Ave Temple Way Mon- 0 -1121 (p) Terminal Blocks H Roos rovia Calif -F E Jasmine -EL City Calif -1 W F HoII -AT 7 -2902 (p) Calif -L -VI 9 -3291 (p) Sound 8 -3206 (p) minal Strips Audio Equip Recorders Optical Comparator (a) Potentiometers Opto Eng'g Co 3524 W Washington Blvd Manufacturers Lab 10610 Keswick -RE 1- Hopkins Eng'g Co 2082 Lincoln Ave Alta. Kwikheat Mfg 3732 San Fernando Rd St Sun Los Angeles 18 Calif -1 Schmidt Valley Calif -H P - dena Calif -C W Wieland -SY 8 -1185 (p) Glendale CalifE E Wachter -CH 5 -2376 Stark -WE 8 -9045 (p) 2259 (p) Test Equipment (a )Telemeter (a) Capacitors (p) Soldering Irons Custom Recording Installations ing Equipment Capacitors Marchant Houston Fearless Div of Color Corp of Research 1475 Powell St Oakland Oregon E,ecsronic Mfg 2232 E Burnside St 8 Calif -G B Greene -OL America 11801 W Olympic Blvd Los Lambda -Pacific Eng'g 14725 Arminta St 2.6500 (p) Dig- rortland 15 Ure -G W elcYnerson -EM 929Z Angeles 64 Calif -H W Houston -BR 2- Van Nuys Calif -L W Mallach -ST 6 -1801 ital Computers (p) rower supplies Industries 4331 (p) Film Processing Machines (p) Microwave Link & Aux Equip Marco 207 S Helena St Ana- Osborne Electric J12 S E Hawthorne Blvd heim -F A Harrington Hufen Industries 2815 W Olive Ave Burbank Landsverk Electrometer 550 W Garfield Ave Calif -KE 5.6037 ortland 14 Ore -G L Osoorne-FI 6448 (a) Light Assemblies Calif-0 F Hoffman -VI 9 -2118 (p) Relays Glendale 4 Calif -D L Collins -CI 1-2954 (p) Transmrmers (a) Transformers Mattson -Cowley Hufford Machine Works Inc Electronics Div (p) Radiation Detection Equip Corp 1487 Lincoln Ave Owen Laos 41.2 Woodward rasedena 10 Pasadena -P F 2201 Carmelina Ave W Los Angeles 64 Lane Electronics 7254 Atoll Ave N Holly- 3 Calif ScniekeRY 1 -6386 Califw H Paap -sY 6 -5167 (p) Tran- (p) FM Receivers Calif -H A Wood -BR 2 -1627 (p) Power wood Calif -R 1 Schollard -ST 7 -3267 (a) sistor Test Sets May Supplies (a) Power Supplies Transmitter Access Eng'g Co 6055 Lankershim Blvd N Lansing Sound Inc James B 2439 Fletcher Hollywood Calif -D M May-ST 7 -2189 Huggins Laboratories 711 Hamilton Menlo Pacific Mercury TV Mfg Corp 8345 Hayven- Dr Los Angeles 39 Calif -W H Thomas - (p) Delay Lines (a) Delay Lines Park Calif -L A Roberts -DA 3 -0013 (p) bepuiveda Cans -Stanley Cutler - NO 3 Loudspeakers Loud- Menlo Research Lab P 0 Box 522 Menlo ourst Ave Traveling Wave Tubes -3218 (p) (a) Receivers (a) Mis- speakers Park Calif -Charles Weeks -DA 5 -8450 (p) EM 2 -3131 (p> TV Hughes Aircraft Florence Ave & Teale St sile Leach Relay Div Leach Corp 5915 Avalon Radiation Det Instr [quip Culver City Calif -R J ShankTE 0 -7111 Laurel Canyon Blvd Blvd Los Angeles 3 Calif -E K Neale -AD Merit Short Wave Diathermy 2758 Whittier Potpie news Inc 7116 (p) Semiconductors (a) Guided Missile F Leo -SI 7-0209 8221 (p) Rectifiers Blvd Los Angeles 23 Calif -G S Mogilner- N Hebywouu CeurN Systems neiays Lear Inc 3171 S Bundy Dr Santa Monica AN 1-7521 (p) Welder fit) Hughey & Phillips 3300 N San Fernando Vista Ave Calif -C J Breitwieser -EX 8 (p) Mesa Plastics 11751 Mississippi Are Los Pacmo Scientoic Co 1430 Grande Blvd Burbank Calif -1 H Ganzenhuber -VI -6211 Flight Control Systems Angeles 25 Calif -P F Fowler -GR 8 -2311 Les Angeles Cold -J [ Glauser -AN 2.1123 9 -1104 (p) Code Beacons (a) Flight Con- trol Systems (p) Molding Compounds (a) Molding sa) Gyroscopes Hycon Mfg 2961 E Colorado St Pasadena 8 Lee Electric & Mfg 2806 Clearwater St. Los Compounds Pantile Semmonuucters Inc 10451 W Jeffer- Calif -W C McFadden -SY 6.8135 (p) Microdot Div Felts Corp 1826 Fremont Ave blvd quiver City Gaut -i N Carman- Digital VTVM (a) Guided Missile Test Angeles 39 Calif -L P Tuttle -NO 3-1295 son (a) DC S Pasadena Calif -Dr H TejadaPY 1 -2782 V (p) modes ta) Diodes Equip Mag Amp Regulated Power Equip 9-z)41. Lenkurt Electric 1105 County Rd San Carlos (p) Coax Connectors (a) Coax Connectors Pac t e Iransuuccr Corp 11836 W Pico Blvd Hycor Co 11423 Vanowen St N Hollywood Calif -K E Appert Miller Dial & Name Plate 4400 N Temple Lus Gallt -G A Argaorlte -brt -Dean -ST 7 (p) Wave -LY 3 -2161 (p) Car- Andetes b4 Calif Fullmer -5389 City Blvd El Monte Calif -Les Iner- Filters rier Telephone & Telegraph Systems (a) Madansky- 5 -11)4 1p) Audio rrodects (a) Carrier Telephone & Telegraph CU 3 -5111 (p) Panels (a) Panels mometers Hydro -Aire Inc 3000 Winona Ave Burbank Systems Leonard Precision Products Boisa Ave Miller Electronics 2840 Naomi St Burbank Paean un.versal Products Corp 168 Vista Calif -H H Rhoads -VI 9-1331 (p) Tran- 9200 Calif -Lew Brown -VI TV Cnanes Cuopnlck- sistors Santa Ana Calif- Leonard Zerlaut -WE 9.1659 (p) Aid Parauena 8 Calif- 5261 (p) Tube Fabricating Equip (a) Antennas nf i -/646 (p) Uptical Coatings la) Tube Fabricating Equip Miller Instruments Wm 325 N Halstead Ave bpticul Coatings Lanker Pasadena Industrial Electronic Engineers 3973 Leroo Div Lynn- Deatrick Inc 501 S Varney 8 Calif -E E HoskinsRY 1 -6317 -neu Co 12333 W Olympic Los An- -D Pacearu shim Blvd N Hollywood Calif G Gum St Burbank Calif -C E Lynn -VI 9 -5556 (p) Oscillographs geles 64 UHT-Kay Paduoce -Ad 7-6741. Industrial Con- 1 pertzSU 3 -7303 (p) (p) Terminal Lugs (a) Terminal Lugs Miller Co W 5917 S Main St Los Angeles sp) TV Recevers (a) let tqu,p 3 Calif -W R Courtney -AD trols Leopold & Stevens Instruments 4445 N E 3 -4297 (p) Page- Fàgweu Corp 1311 Kiversme Dr Los Inet Div Leach Corp 4441 S Santa Fe Los inductances Winn St Portland 13 Ore -L E Rinker- ringeies 31 Gatli-n E rage-CA 1 -1106 -1 L Elliott -LO 8.4771 (p) Moisture Register 1510 Angeles Calif VE 4147 (p) Water Level Registering W Chestnut St Al- (p) Control uevlees Rectifiers Systems hamora Calif -M L McBrayer -CU 3 -3143 Palmer Inc M V 4002 Fruit Valley Rd Van- Development & Mfg 3018 E Foot- Levinthal Electronic Products (p) Moisture Testing Instr Instrument 2821 Fair couver wash -Martin Palmer -UA 5.2894 Blvd Pasadena 8 Calif -L Mager -SY Oaks Ave Redwood Mole- Richardson Co 937 N Sycamore Ave hill City Calif -A 1 Morris - (p) Dial Telephones (a) l elemetering (p) Motor Gen & Freg Regula- EM 8 -2963 Microwave Hollywood 38 Calif -W K Parker -PL 4- 5 -5941 (p) Transmitters Systems tor Test Set (a) Pressure Transducer (a) M icrowave Transmitters 3660 (p) Lighting Equip Palo Alen Eng'g Co 440 Olive Ave Palo Alto Research Corp 177 W Lewis & Kaufman 17320 El Rancho Ave Monitor Products 815 Fremont Ave Pasa- Int'l Electronic S Gain -d E Lee -DA 5 -3251 (p) Trans Calif -Leroy Los Gatos -N V dena -H E Magnolia Blvd Burbank Calif Bramley -EL 4 -3540 Calif Blasier- PY 1 -1174 (p) formers (a) transformers Woods -VI 9 -2802 (p) Tube Shields (a) (p) Power Transmitting Tubes (a) Power Quartz Crystals (a) Quartz Crystals Panero Mirrors Inc 2958 Los Feliz Blvd Los Tube Shields Transmitting Tubes Moran Instrument 170 E Orange Grove Ave Angeles 39 Calif -1 W Dougnerty -NU 1. Corp 1521 E Grand Ave El Librascope Inc 808 Western Ave Glendale 1 Pasadena Intl Rectifier 3 Calif -H E Ohanian -SY 6 -7158 2141 (p) Resistive Coatings Segundo Calif -Eric Lidow -OR 8 -6281 (p) Calif -D C Webster -CH 5 -2677 (p) Com- (p) Gamma Logger Pantek Co Box 212 El Segundo Calif -E Selenium Rectifiers (a) Selenium Recti- puters & Controls (a) Computers & Morgan Instruments Div Westwood Research Swarthe -WH 7909 (p) Frequency Dividers fiers Controls & Development Labs 921 Westwood Blvd Ave Lipps Eng'g Edwin A ta) Frequency DIvidets Int.! Research Assoc 2221 Warwick 5485 W Washington Los Angeles 24 Calif -H C Morgan -GR Par Products Corp N Citrus Ave Holly- Santa Monica Calif -W R Courtney -TE 0- Blvd Los Angeles 16 Calif -C V Olson - 8 -4111 (p) Radiation Det lnstr 926 & Marine Comm Equip WE 5 -4141 (p) Magnetic Recording wood 38 Cal11P A Roos -HO 5-6298 (p) 4415 (p) Aircraft Morrow Radio Mfg 2794 Market St Salem - Receiver Heads (a) Telemetering Heads Motors (a) Landing Simulator (a) VHF Transmitter Ore -Wm Wane-3-6952 (p) Forestry Equip Ave Los Angeles Litton Industries of Calif 336 N Foothill Parsons Co Ralph M 617 S Olive St Los Intl Telemeter 2000 Stoner Moseley Co F L 409 N Fair Oaks Ave (p) Rd Beverly Hills Calif -Harry GrayCR Angeles 14 Calif -P H Reedy -MA 9 -2484 25 Calif -G W King -GR 8 -7751 Pasadena 3 Calif -F L Moseley -RY 1 4 -7344 (p) Test Egiup -8998 System of Pay TV (a) Test Equip (p) DC Servo Voltmeters (p) Telemetering Equip (a) Instrumenta- Blvd Los Litton Industries of Calif Power Tube Div tion Services I Q Industries 6110 Wilshire Motordyne Inc 2661 5 Myrtle Ave Monrovia Angeles 48 Calif- Stewart Tongret -WE 3 1025 Brittan Ave San Carlos Calif -St. Pathfinder Electronics Co 6836 Lexington George Lafitte -LY 3 -3124 (p) Mag- Calif -1 1 Marino -DO 6 -2121 (p) Motors 8204 (p) Photo -electric Controls (a) (a) Motors Ave Los Angeles 38 Calif- Robert New - netrons, Klystrons comb-HO P A Amplifiers Photo -electric Smoke -Fire Detectors Mueller Lab 1052 N Allen Ave Pasadena 9 -5384 (p) Lockheed Aircraft Corp Van Nuys Calif - (real Industries 2242 S Sepulveda Blvd Los Calif -Fred McClure -SY 7.0909 PCA Electronics Inc 2180 Colorado Ave E R Quesada -ST (a) Missile (a) 64 Calif- Gustav Geiger -GR 7- 7.5421 Santa Monica Calif -K H Dendy -TE 0- Angeles Systems Counters 9449 (p) Encapsulated Resistors (a) Mullenbach Div of Electric Machinery Mfg 6716 (p) Delay Lines Loge Sound Engineers 1 M 2171 W Wash- Encapsulated Resistors 2100 E 27 St Los Angeles -R Pecco Corp 2760 Whittier Blvd Los Angeles ington Blvd Los Angeles 18 Calif-1 M 58 Calif Iron Fireman Mfg Electronics Div 2838 S F -LO (p) 23 Calif -M D Preston -AN 9 (p) Loge -RE 4 -9178 (p) Intercom Systems Cline 5 -5331 Relays (a) Re- -4164 E 9 Ave Portland 2 Ore -A L Judson -Fl lays Dielectric Heaters Luther Electronic Mfg 5728 W Washing- 6551 (p) Relays (a) Gyroscopes Mytron Mfg 4504 Brazil Los Angeles ton Blvd Los Angeles 16 Calif -C L John - St 39 Peerless Electrical Products Div Altec Lansing Ave Los Angeles Irwin Labs 1238 S Gerhart son-WE 9 -5826 (a) Pulse Forming Net- Calif -F Temple -CH 5 -4931 (p) Hi -Freg Corp 9356 Santa Monica Blvd Beverly 22 Calif -W W Irwin -RA 3 -1819 (p) works Preheaters Hills Calif -A A Emlen -CR 5 -5101 (p) Testing Equip (a) Magnetometers Lynch Carrier Systems 695 Bryant St San Transformers (a) Transformers Francisco 3 Calif -D E Campbell -EX National Hollywood 1475 El Mirador Dr Penta Laboratories 312 N Nopal St Santa laMac Products 8845 N E Sandy Blvd Port. 7 -1471 (p) Carrier Telephone System Pasadena Calif -F C Hoffman -RY 1-6374 Barbara Calif -R L Norton -WO 5 -4581 (p) land 20 Ore1 W Jackson -AT 2 -4418 (p) Equip (p) Recording Discs (a) Recording Tape Electron Tubes Antennas (a) Antennas Reels Perkin Eng'g Corp 345 Kansas St El Se- Junco Corp 3111 Winona Ave Burbank Calif McAlister Inc 1 G 1117 N McCadden PI Natural Lighting 612 W Elk Ave Glendale gundo Calif -1 W Horton -OR 8-7215 (p) T A Andrew -VI 9.2107 (p) Jumpers, Hollywood 38 Calif -R L LoganHO 9 -5317 4 Calif -Vinnie Howarth -CH 5 -5551 (p) Power Supplies (a) Power Supplies Bus Bars (a) Shunts (p) TV Lighting Equip Lighting Equip Permollux Corp 4101 San Fernando Rd

6 TELE -TECH & ELECTRONIC INDUSTRIES August 1955

www.americanradiohistory.com ELECTRONIC OMPONENTS COMPUTERS CONTROLS COMPONENTS ci BY LIBRAarSCOPE ANALOG -DIGITAL MAGNETIC AMPLIFIERS CONVERTERS Librascope manufactures high per- A series of shaft position to digital formance magnetic amplifiers and encoders featuring serial /parallel transistor magnetic amplifier com- time sharing, non -ambiguous brush binations for industrial servo -con- systems. The following codes are trols, analog and digital computers and available: Gray, Binary or Binary - servo -stabilization networks. Coded Decimal.

MAGNETIC READ AND RECORD HEADS LABORATORY DRUMS For recording or reading of mag- A 5" diameter drum with provisions netic drum memory systems in dig- for eight channels. Includes two ital computers. High read -back machined clocks. Packing density signal, low noise factor. Many up to 150 bits per inch. Variable models. speed motor, heads and adjustable mounts included. Special drums to meet your specifications. X -Y PLOTTER AND RECORDER M PON ENTS A compact desk or rack -mounted instrument for recording two independent variables on standard graph paper. Two basic input sections allow continuous curve recording from low level D.C. signals with essentially infinite input impedance, or point by point plotting from a variety of digital inputs. Spe- SINE- COSINE MECHANISM Self- contained unit converts angu- BALL & DISC INTEGRATOR cial inputs to meet customer applications lar rotation into linear sine and cosine movements or solves many Precision unit with lifetime lubri- are available. trigonometric functions. cation. Used in totalizing, rate determination, differential analysis. Also serves as closed loop servo -element or variable speed INPUTS TO PLOTTERS OR FOR OTHER drive. DIGITAL SYSTEMS APPLICATIONS

PUNCHED CARD OR DECIMAL BINARY PUNCHED TAPE KEYBOARDS CONVERTER CONVERTERS For manual inser. Converts 9 bit, 2 HOLLOW SHAFT LINKAGES Units available to tion of tabulated channel data from DIFFERENTIAL Various linkage computing ele- data. buffer convert output thyratron Precision computer component for ments are available, including: from IBM Summary storage of parallel addition. subtraction linkages, link- digital computers. measuring angular positions or Punch or any code velocity sums. May be installed or age multipliers and function gen- from Punched removed without disassembly of erators to express exponential, Paper Tape unit or differential itself. logarithmic and square root func- Readers. tions.

ENGINEERS, PHYSICISTS AND MATHEMATICIANS; Fora rewarding SINE WAVE GENERATOR career with a company that offers uptinnuu stability with job diversification, write Librascope today. Address inquiries to Mac Used in frequency syntheses to de- Mekeugue, Personnel Director. termine data on transfer functions of automatic control systems and components.

SPECIAL COMPUTERS OR For complete catalog information on DATA HANDLING EQUIPMENT and of the above products, write: Librascope manufactures mechanical and electrical analog computers and digital computers for military and IBRASCOPE commercial purposes. You are invited to submit your special computer requirements to our engineering staff.

I , I . L B R A S C O P E N C 8 O 8 WESTERN A V E N U E G L E N D A L E C A L I F O R N I A

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 7

www.americanradiohistory.com 1955 Directory of West Coast Electronic Manufacturers

Glendale Calif- Robert Guthrie -CH 5.5135 Reber Rotor Inc 6006 Washington Blvd Cul- Standard Plastics & Electronics Co 21343 U M & F Mfg Corp 10929 Vanowen St N (p) Transformers (a) Transistor Ampli- ver City Calif -0 B Robey -VE 8 -3271 (p) Roscoe Blvd Canoga Park Calif -H M Hollywood Calif -Dick Tice -ST 7 -5526 (p) fiers Gyroscopes Greene -DI 7 -8500 (p) Amplif- Modulator Circuit Chassis Assembler Phaostron Co 151 Pasadena Ave S Pasadena Robinette Co W C 802 Fair Oaks Ave S (a) Amplif- Modulator Ungar Electric Tools 4101. Redwood Venice Calif -E W Carlson -CL 5 -1471 (p) Multi - Pasadena Calif -W C Robinette -PY 1.1594 Standard Wire & Cable Co 3440 Overland Calif -A R Knowles -EX 8 -5718 (p) Sold- meters (a) Meters (p) Servos Ave Los Angeles 34 Calif -M E Harris -TE ering Irons Photo Chemical Products of Calif 1715 Ber- Robuck Labs 1431 S La Brea Ave Los An- 0 -4647 (p) Hookup Wire (a) Wire United Control Corp 4540 Union Bay Pi geles -E R Robuck -WE keley St Santa Monica Calif -1 T Cain -TE 19 Calif 6 -0444 Cable Seattle 5 Wash -R L Hancock -PL 9200 0 -8451 (p) Dials (a) Dials (p) Control Ovens (a) Control Ovens Stanford Labs 1661 Bdwy Redwood City (a) Temp Control Systems Photoeon Research Products N Roesch Inc Douglas 2200 S Figueroa St Los 421 Foothill Calif -E W Van Buskirk -EM 8.4127 (p) United Geophysical Corp 1200 S Marengo E Angeles Calif -A P Jacobs -RI 7-9361 Blvd Pasadena 8 Calif -C Grinstead -SY 7 Accelerators (a) Microwave Tubes Ave Pasadena 5 Calif-BW SorgePY 2 -4131 (p) Pressure Measuring Equip (p) Missile Cables (a) Missile Cables Star Engraving Co 223 E 4 St Los Angeles 1-1134 (p) Amplifiers Photo Research Corp 127 W Alameda Ave Rototest Labs 2803 Los Flores Blvd Lynwood 13 Calif -Burril Manis -MA 9 -3561 (p) United Transformer Par Div 4008 W Jef- Burbank Calif -F F Grandell -VI 9 -2891 Calif -E A Raney -NE 6 -9238 (p) Com- Panels ferson Blvd Los Angeles (p) Measuring Instruments ponent Testing 16 Calif -A J Statham Labs 12401 W Olympic Blvd Los Kornblum -RE 1 -6313 (p) Transformers Pioneer Broach Telegraph Rd Los R & R Tool & Die Co 1112 Chestnut St Co 6434 Angeles 64 Calif -M diGiovanni -BR 2- (a) Transformers Angeles 22 Calif -E A Clark -RA 3 -4536 Burbank Calif -G P DelFaro -VI 9 -3611 6284 (a) Accelerometers Unitek Corp 275 N Halstead Ave Pasadena (p) Broaching Machines (a) Broaches (p) Stampings Stephens Mfg Corp 8538 Warner Dr Culver Pomona Electronics Co 1126 W Fifth Ave RS Electronics Carp 435 Portage Ave Palo 8 Calif -Dr Frank Page -SY 5 -2377 (p) City Calif -R C Tetherow TE 0 -3775 (p) Welders Pomona Calif -1 1 Musarra -LY 2-6570 (p) Alto Calif- Robert K -F Scal -DA 3 -9063 Loudspeakers (p) Radar Components (a) Radar Anten- Universal Electronics Co 1720 22nd St Socket Adapters (a) Socket Adapters Electric Motors Telegraph Rd nas Sterling 5401 Santa Monica Calif -Edward Lacey -EX 3- Ponder & Best 814 N Cole St Hollywood 38 Los Angeles 22 Calif -1 Eastman -RA Beloit Angeles 3- 7707 (p) Power Supplies (a) Power Sup- Calif -1 C Best -HO 9 -6251 (p) TV Lenses Rumple Inc 2308 Ave Los 64 6211 (p) Motors Precision Radiation Instruments Calif -W W Brockway -BR 2 -1741 (p) plies 4223 W Jef Stewart Eng'g Co P 0 Box 277 Sequel ferson Blvd Los Angeles - Choppers U S Eng'g Co 521 Commercial St Glendale 16 Calif George Calif -R F Stewart-GR 5 -4790 (p) Travel- Rutherford Electronics 3707 S Robertson 3 -C B Thornton -CH Hare -RE 1-7321 (a) Scintillator ling Wave Tubes (a) Travelling Wave Calif 5.5777 (p) Prescott Television Co 7350 Beverly Blvd Los Blvd Culver City Calif -M F Clapp -TE 0- Etched Circuits 4362 (p) (a) Tubes Angeles 36 Calif -B W Reagan -WE 3-7193 Generators Generators Stoddart Aircraft Radio 6644 Santa Monica U S Relay Co 1744 Albion St Los Angeles Rytel Div Cal -Lee Mfg Co W Adams (p) TV Receivers 5653 Blvd Hollywood 38 Calif -A T Parker -HO 31 Calif -Paul Chamberlin -CA 2-9146 Blvd Los Angeles 16 Calif -C C Howard - Printed Cellophane Tape Co 521 N LaBrea 4 -9294 (p) Interference Meas Equip (a) Relays Ave Los Angeles 36 Calif -Sydney Gevirtz- WE 5 -5883 (p) HI Ft Equip Summers Gyroscope Co 2328 Broadway Santa Up-Right Inc 1013 Pardee St Berkeley 10 WE 8 -2134 (p) Printed Tapes (a) Monica Calif -1 W Brubaker -EX 3 CalifR E Fisher -TH 3-0770 (p) Towers Printed Tapes San Fernando Electric Mfg West -Cap Div -6711 (p) PAR Gyro (a) Flight Control Sys- (a) Towers Product Associates 1046 S Los 1509 First St San Fernando Calif -Frank Olive St An- tems geles 15 Calif -1 T Blakistone -RI 7-4519 LaFetra -EM 1-8681 (p) Capacitors (a) Sylvania Electric Products 2936 E 46 St (p) Tape Recorders Capacitors Vacuum Tube Products 506 S Cleveland St Los Angeles 58 Calif LO 5 -8121 (p) Preyn -Moore Inc 1338 Cota Ave Long Beach Santa Monica Bay Sheltered Workshop 2521 Oceanside Calif -H W Ulmer -SA 2-6567 Diodes, Test Equip (p) Vacuum Gauges (a) 13 Calif -C C Moore Jr- 357 -417 (p) An 5 St Santa Monica Calif -1 E Anthony - Welding Equip ten nos EX 9 -7741 (p) Toroidal Windings (a) Vanguard Electronics 3384 Motor Ave Los P S P Eng'g Co 8420 Otis South Gate Calif - Toro ids Ta -Mar Inc 11571 W Jefferson Blvd Culver Angeles 34 Calif -S A Golbert-TE 0-7344 C B Pearson -LO 7-1451 (p) Solenoids Sargent -Rayment Co 1401 Middle Harbor Rd City Calif- Marioano Orenge-TE 0 -7479 (p) Inductances (a) Control Components (D C) (a) Solenoids (D C) Oakland 20 Calif -Will Rayment -GL 1- (p) Remote Control (a) Isolation Units Vapor Recovery Systems 2820 N Alameda 7045 (p) AM -FM Tuners Tartak Electronics 2979 N Ontario St Bur- Compton 1 Calif -Wilbur Hein -NE 6 -1211 Scantlin Electronics P 0 Box 24561 Los An- bank A (p) Gauging Systems "Q" Circuits Co 32 Laskie St San Francisco Calif -A Tallis -VI 9 -2414 (p) geles 24 Calif-I D Wilson -OR 8 -7913 Associates 3 Calif- Bernard Silverman -MA 1 -5734 Transformers (a) Transformers Varian 611 Hansen Way Palo Paging Equip (p) Printed Circuits (a) Printed Circuits (p) Radio Technical Associates 140 W Providencla Ave Alto Calif- Sigurd Varian -DA 5-5631 (p) 'Seaboard Coil Spring Div Associated Spring Klystrons OAK Electronic Products 445 N Circle Dr Burbank Calif -Sheldon Knoch -TH 8 -8133 Corp 15001 S Bdwy Calif -Glen Fresno Calif -Bert Williamson -7 -1423 Gardena (p) Nuclear Instruments Vector Electronics Co 3352 San Fernando (p) Sumpter -PL 6 (p) Coil Windings Turntables -8141 Technical Deveienment Corp 4060 'nee Rd Los Angeles 65 Calif -R R Scoville - Semco Electronics Co 8407 S Hoover St Los Qualitron Inc 2945 Hollywood Way Burbank Blvd Culver City Clif -P R Masson -TE CL 7 -8237 (p) Plugs (a) Plugs Angeles 44 Calif -G A Korkos -PL 2 -7657 Calif -E P King -ST 7 -5963 Control 0 -5461 (p) Synch Motors Viking Electric Div Viking Industries 21341 (a) (p) TV Receivers Panels Technical Devices Co 2340 Centinela Ave Roscoe Blvd Canoga Park Calif -H M Semler Industries Lankerhim Bird N 6853 Los Angeles 64 Calif -Arthur Lambert-GR Greene Jr-DI 7 -8500 (p) Connectors Hollywood -N N Semler -ST Calif 7.1554 7 -0708 (p) Wire Cutter (a) Connectors Radar Engineers 4528 5th NE Seattle 5 (p) Test Equip (a) Communications Technical Training Institute 5018 N E Vinson E R Wash -W T Harrold -ME 8079 (p) Cable Equip Co 1401 Middle Harbor Rd Ilnion Ave Portland 11 Ore -A F Brusch- Oakland 20 R Vinson Test Instr (a) Cable Test Instr Sequoia Process Corp 871 Willow St Redwood Callf-E -GL 1- TR 8732 (p) Trainer Boards 2357 (p) Photoelectric Control Radiaphone Co 600 E Evergreen Ave Mon City Calif -1 R Hughes -EM 8 -4651 (p) renia Calif -Chas Petry-EL 8 -2586 (p) Plastic Insulated Wires (a) Plastic In- Teksum Inc 11368 W Olympic Blvd Los An- Vought Co 9278 Santa Monica Blvd Beverly Potentiometers (a) Potentiometers sulated Wires geles 64 Calif -H G Hoffer -BR 2-4504 Hills Calif -G H Hearon -CR 6 -2621 (p) Servo Amplifiers Radio Corp of America 11819 W Olympic Servonlc Instruments 11145 S Fair Oaks (o) Photographic Recorders Blvd Los Angeles 64 Calif -T L Gottier -BR Pasadena 2 Calif -1 A De Julio -SY 9-1332 Tektronix Ink P 0 Rnx 831 Portland 7 Ore -R L Ropiegeet -CY 2 -8841 (p) Radar (a) Radar (p) Pressure Transducers (a) Pressure 2-2611 (p) Os- Walkirt Co 145 W Hazel St Inglewood cilloscopes 3 Radioplane Co 8000 Woodley Ave Van Nuys Transducers Calif -H W Beckwith -OR 8.2873 (p) Calif -S E Weaver -ST 6 -7020 (a) R -C Shannon Luminuos Materials Co 7356 Santa Tlautonraph Coro 1128 Cranshow RIv4 Plugin Circuits Drones Monica Blvd Hollywood -1 R Los Angeles 19 Calif -R G Leitner -WE 46 Calif AI- Walsco Electronics 3602 Crenshaw Blvd Los Radio Specialty Mfg Co 2023 S E Ave 3 -7168 Transmission 6th burger-HO 7 -5509 (p) Inspection Lamps (p) Graphic Sys- Angeles 16 Calif -Frank Hurd -AX 3-7201 Portland 14 Ore -Harold SterneES 8123 Shasta Div Beckman Instruments P 0 Box tems (p) Hardware (p) Portable FM Recurs 296 Station A Richmond Calif -G H Telecomputing Coro 12838 Satires, St N Walton Tool & Die 3210 V'nawen St Bur- Ransom Research P 0 Box 382 San Pedro Bruns Jr -LA 6 -7730 (p) Voltmeters (a) Hollywood Calif -P W Simms -(p) Com- bank Calif -John Crawford-V1 Calif -D H Ransom -TE 2 -6848 (p) Dig- Freq Meters nutinn Ennip 9-1914 (a) Sub -Assemblies ital Counters (a) Regulators Shelby Instrument Co 1701 Magnolia Long Temon 21341 Roscoe Blvd Canons Part Ratigan Electronics 3614 Maple Ave Los An- Beach 13 Calif -ira BaylessHE 7 -6300 Calif -Jerry Fisher -DI 7 -2255 (p) TV West Coast Electronics 5873 W Jefferson Blvd Los Angeles geles 11 Calif -E C Rau -AD 3 -4141 (a) Sub Sub Miniature Electronics Masts 16 Calif -H P Gates ir- (p) TE Coils 'Sheldon Electric Co Div of Allies Elect Testa Mfg Co 10130 E Rosh St El Mont. 0 -7211 (p) S Band Beacon (a) S Band Beacon Rea Co 1 B 1723 Cloverfeid Blvd Santa Prods 2724 Leon's Blvd Los Angeles 58 Calif -R E Eisele -CU 3-6022 (p) Optical Monica Calif -D T Gundersen -EX 3 -7201 Calif- Walter Wichowski -LO 5 -5427 (p) Components (a) Optical Components Western Coll Products 2989 Middlefield Rd (p) Computer (a) Hovering Control Cathode Ray Tubes (a) Cathode Ray Thermador Elec Mfg Co Electronles Div 2000 Palo Alto Calif -1 M Kaar -DA 3.2718 Rectifier Eng'g Co 1803 E 7 St Los Angeles Tubes s Camfeld Los Angeles 22 Calif -1 W (p) Coils 21 CalIf -L B Lester -TU 5169 (p) Bat Short Wave Plastic Forming Co 2921 W Warded -RA 3 -5189 (p) Transformers Western Gear Electra Products 132 W Colo- tery Chargers Alameda Ave Burbank Calif -Frank WII- (a) Motors rado St Pasadena 1 Calif -1 R David -RY Red Point Products 1907 Riverside Dr Glen- born -TH 8 -9606 (p) Hi Freq Generators Thermo Instruments 1310 Old County Rd 1.6604 (p) Rotary Elect Equip (p) Ro- dale 1 Calif -R P Craig -TH 2 -4623 (p) (a) Woodwelders Belmont Calif -D M CombLY 3 -5139 tary Elect Equip Impregnating Machinery (a) Impregnating Shrader Co F W 5788 Washington Blvd (p) Control Equip Western Gold & Platinum 589 Bryant St Machinery Culver City CalifF W Schrader -WE 8- Thor Transformer & Electronics 750 San San Francisco 7 Calif- Waiter Hack -SU Reed & Reese No Ave 697 Lake Pasadena 6 6277 (p) Electromagnets (a) Electro- Antonin Rd Palo Alto Calif -H 1 Blydsell- 1-2065 (p) Brazing Alloys Calif -N 1 Rosen -RY 1 magnets -9646 (p) Solen- Y0 7 -9116 (p) Transformers Western Insulated Wire 2425 E 30 St Los oids (a) Potentiometers Sierra Electronic Corp 1050 Britten Ave San Timely Instruments & Controls Co 1645 W Angeles 58 Calif -Geo Hunsinger -LU 7- Regulator Eng'g & Devel 11545 W Carlos Calif -Paul ByrneLY 1 -0711 (p) Jefferson 135 St Gardena Calif -W Kasten -PL 6- 7103 (p) Cords & Cables Blvd Culver City Calf -R E Lloyd -EX Power Monitor 8- 8153 (a) Servo Amplifiers Western Radiation Lab 1107 W 24 St Los 5733 (p) Power Supplies Signal Equipment Co 2706 Third Ave Seattle Prndecte 12210 Nebraska Ave Les Angeles 7 Calif-G L Locher -RI 7.8355 Reiter Co F 3340 Bonnie Hill Dr Holly- 1 Wash -1 F Johnson -SE 4712 (p) Transco -GR Scintillation Counters wood 28 Calif -F Reiter -HO 2-2913 (p) VTVM'S (a) Cathode Followers Annins 25 Calif- Harold Beeman 8- (p) Co Switches (a) Co- Westline Products Div Western Tape Spiker Silver Bay Equip Co 5004 20th N W Seattle 4241 (n) -Axial Lithograph Co Switches 600 E 2 St Lns Angeles -Bruno Remler Co Ltd 2101 Bryant St San Fran- 7 Wash -M F Kerr-DE 4960 (p) Commu- Axial 54 Callf cisco 10 Calif -H A Greene -VA 4 -3435 nication Products (a) Nameplates Transformer Engineers 161 E California DeToffolTR 2641 (p) Wire Markers (a) P -RY Markers (p) Announcing Systems (a) Announcing Skyway Precision Tool Co 1107 S Fremont st Pasadena 1 Calif -1 WhIstler 1- Transformers Westport Electric 149 Lomita St El Segunda Systems Ave Alhambra Calif -1 1 Cornwell -CU 3- 6906 (p) Transformers (a) -R E Hupp Repath Co Paul R 641 E 61st St Los An- 4181 (p) Torque Test Equip Transonic Inc 808 16 St Bakersfield Calif - Calif -EA 2 -0726 (p) Counters geles 1 Calif -P R Repath -AD 3 -7262 (p) Soderberg Mfg Co 628 S Palm Ave Alham- R M Hanson -FA 4 -0794 (p) Trans- Whittaker Gyro 16217 Lindbergh St Van Laminations (a) Laminations bra Calif -W W Hulke-CU 3-3382 (a) formers (a) Transformers Nuys Calif -ST 5-2131 (p) Gyroscopes (a) Resdel Eng'g Corp 330 S Fair Oaks Ave Light Assemblies Triad Transformer Coro 4055 Redwood Ave Gyroscopes Pasadena Calif -1 L De Diemar -SY 5-5197 Solar Mfg Corp E 46 & Seville Ave Los Venice 3 Calif -E M Kelllor -TE 0 -5381 Wiancko Eng'g Co 255 N Halstead Ave (p) Velocimeters (a) Velocimeters Angeles 58 Calif -Keith Clark -LO 8 -1411 (o) Transformers (a) Transformers Pasadena 8 Calif -T H Wianeko-RY 1- Reynolds Industries 2105 Colorado Ave Santa (p) Capacitors Tr1Dex Co P 0 Box 1207 Lindsay Calif - 5226 (p) Measuring Systems (a) Sensing Elements Monica Calif -A M GriflnTE 0-4803 (p) Southern Electronics Corp 239 W Orange K B Howard- 2.4051 (p) Etched Circuits Cable Connectors (a) Connectors Grave Ave Burbank Calif- Norman Schwartz - Triolett & Barton 831 N Lake St Burbank Wildberg Bros 742 Market St San Fran- cisco -A RHO Eng'g Co 4205 Sepulveda Blvd Culver VI 9 -3193 (p) Capacitors (a) Capacitors CallfR E Hiller -VI 9.1291 (p) X -Ray 2 Calif A WildbergDO 2 -3505 City Calif -B L Hamby -TE 0 -8441 (p) Specific Products 14515 Dickens St Sherman Unit (a) X -Ray Unit (p) Alloys Resistors Resistors -James -ST (a) Oaks Calif Sherman 7 -9615 Trutone Electronic Eng'g 812 N Highland Woodwelding Inc 3000 W Olive Ave Burbank Richardson Co Dr WWV Receivers 5860 Spring Oak Holly- (p) Los Angeles 38 Calif -H M Cohen -HO 4- Calif -Frank Wilburn -VI 9-1841 (p) RF wood 28 Calif -Sidney Richardson -HO 7- Spinco Div Beckman Instruments 743 O'Neill 1202 (p) Audio Equip Woodwelders (a) Woodwelder 5332 (p) Conectors (a) Connectors Ave Belmont Calif -P F Scofield -LY 3- Tubing Seal Cap 808 W Santa Anita San Wyco Metal Products 6918 Beck Ave N Hol- Richomatie Inc 820 N Fairfax Ave Los An- 7693 (p) Power Supplies Gabriel Calif -W F Gresham -AT 9-5111 lywood Calif -John Hoffman -ST 7 -5579 geles 46 -H N -OL Electric Panama St Calif Parker 3 -1920 (p) Sprague Co 12870 (p) Metal Stampings (p) Cabinet Racks (a) Cabinet Racks Remote Control TV Los Angeles 66 Calif -TE 0-7491 (p) Tub -Lok Mfg Co 767 Loma Verde Palo Alto Risco 265 Minna St San Francisco 3 Calif - Capacitors (a) Capacitors Calif -1 Boitos -DA 5-3950 (p) Tube Zenith Div Zenith Plastics Co H N Kalb -EX 2.7820 (p) Carrier Equip Stancil -Hoffman Corp 921 N Highland Ave Aircraft 1600 Clamps (a) Tube Clamps Braham (a) Condensers Hollywood 38 Calif -S Salat -HO 4-7461 W 135 St Gardena Calif -W E -PL Robertshaw Felton Controls Co Aeronautical (p) Tape Recorder 6 -8111 (a) Radomes Div 401 N Manchester Blvd Anaheim Standard Coil Products 1919 Vineburn Ave Ultra -Violet Products 5114 Walnut Grove Zero Mfg 1121 Chestnut St Burbank Calif - Calif -R H Wehrli -KE 5 -8151 (p) Posl- Los Angeles 32 Calif -E P Thies -CA 2- Ave San Gabriel Calif -I R PfisterCU 3- A P Gambee -VI 9-5521 (p) Instrument tioners (a) Synchron 8161 (p) TV Toners (a) Motors 3193 (p) Short Wave Lights Cases (a) Cabinets

8 TELE -TECH & ELECTRONIC INDUSTRIES August 1955

www.americanradiohistory.com T E L E -TECH & Electronic Industries

AUGUST, 1955

FRONT COVER: Radar and guided missiles are symbolic of today's nreat electronic activities by West Coast manufacturers. And this of course is the time of year when oll eyes are focused on the Golden West. On August 24 -26 it will be time for WESCON 1955! The western electronic industries continue to grow and to expand. This year we surveyed over 850 companies to develop the most complete and up -to -date Directory of West Coast manufacturers. It appears in this issue as Section Two. The Directory of West Coast Reps and Distributors is on page 122. See also pages 69, 72 and 73 for other topics of West Coast interest. SECTION ONE: TOTALS: Aviation Industry Survey 3 Monthly News Round -up: As We Go to Press 9 Electronic News Briefs 25 New Tech Data for Engineers 30 Corning Events 32 Washington News Letter 112 West Coast News Briefs 130

On Conventions and Shows 69 Radarscope: What's Ahead for the Electronic Industries 70 WESCON 1955 72 Predictable Design of Transistor Amplifiers Richard B. Hurley 74 Instrumentation for Aircraft Engines 76 Criteria for Electromagnetic Delay Lines Norman W. Gaw, Jr. 8 David Silverman 78 Page from an Engineer's Notebook Joseph F. $ odaro 81 No. 31- Calorimetric Wattmeter Nomograph... . Ferrite Heads for Recording in the Megacycle Range W. R. Chynoweth 82 Designing a Precision Frequency- Measuring System . Alan S. Ragley 8 Dexter Hartke $4 27 Rules for Guided Missile Design Engineers Robert Luster $6 Structural Dielectrics in Cap -Type HF Antennas H J. Sang 8 B. M. SiRord $g Low Level Magnetic Amplifier F Gourash 90 Stacked Ceramic Tubes Harold E. Sorg 92 An Airborne Standby VHF Transmitter and Receiver K M Miller 94 Germanium Power Rectifiers J. T. coraldo 8 Noel Ile 96 Improving Electronic Reliability -Part I H. B. Brooks 98 Rotating Reading Heads 100 Viewpoints on D-Amplifier Design -Part Il Dr. Harry Stockman 101 Cues for Broadcasters 114 Improving Communications in TV W. H. Cole 116 West Coast Representatives & Distributors 122 Engineering Management in a Growing Laboratory R E Samuelson 152 New Electronic Equipment New Avionic Products 102 New Western Electronic Equipment 108 New Electronic Materials 103 Nerv Electronic Products 110 New Western Test & Measuring Equipment . 104 New Technical Products 150 New Test & Measuring Equipment 106

DEPARTMENTS

Books 60 News of Manufacturers Reps 126 Personals 196

Industry News 194 Tele Tips 34 SECTION TWO: West Coast Electronic Industries Directory

TELE -TECH & ELECTRONIC INDUSTRIES, August 1955, Vol. 14, No. 8. Published monthly by Caldwell -Clements, Inc. Publishers also of MART and TECHNICIAN. Publication Office, Emmett St., Bristol, Conn. Editorial, advertising and executive offices, 480 Lexington Avenue, New York 17. Telephone Plaza 9.7880. M. Clements, President; M. H. Newton, Assistant to President; John J. Borghi, Vice President and Treasurer; M. B. Clements, Secretary. Acceptance under section 34.64 Postal Laws and Regulations authorized at Bristol, Conn., June 9, 1954. Additional occeptonce at New York, N. Y. 75e a copy. Subscription

Rates: United States U. S. Possessions: 1 and year 55.00; 2 years $8.00; 3 years $10.00. Canoda: 1 year $7.00; 2 years $11.00; 3 years S14.00. All other cuntries: 1 year $10.00; 2 years $16.00. Please give title, position and company connections when subscribing. Copyright 1955 by Caldwell- Clements, Inc. Title Reg. U. S. Pat. Off. Reproduction or reprinting prohibited except by written authorization. Printed by Hildreth Press, Inc., Bristol, Conn., U.S.A.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 1 www.americanradiohistory.com hitch your missile to a star.

FOR CONTROL proven components now in production

Pressure Pickups and Synchrotel Transmitters to measure and electrically transmit true airspeed indicated airspeed absolute pressure log absolute pressure differential pressure log differ. ential pressure altitude Mach number airspeed and Mach number.

Pressure Monitors - to provide con. trol signals for altitude, abso- Navigation and Control Devices lute and differential pressure, vertical speed, etc. for Missiles and Aircraft Acceleration Monitors - for many applications now served by gyros. Kollsman has designed, developed and produced Pressure Switches - actuated by the following navigation and control systems and static pressure, differential components: pressure, rate of change of static pressure, rate of climb or FOR OR GUIDANCE NAVIGATION descent, etc. Photoelectric Sextants for remote semi- Motors - miniature, special purpose, navigation. automatic celestial including new designs with in- SAN FRANCISCO, CALIF. tegral gear heads. Automatic Astrocompasses for precise VISIT US IN automatic celestial directional reference and BOOTHS 1621 1622 navigation. SPECIAL TEST EQUIPMENT Photoelectric Tracking Systems For many years optical and electromechanical for flight observations. Kollsman has specialized in high precision tracking test systems. your Periscopic Sextants for manual celestial observations. Please write us concerning specific requirements in the field of missile Computing Systems to provide precise control and guidance. data for automatic navigation and guidance, or aircraft operated by optical, electromechanical, and pressure Technical bulletins are available sensing components. on most of the devices mentioned.

ko I l s m a n INSTRUMENT CORPORATION

PRODUCTS CO. INC. 80 -08 45th AVE., ELMHURST, NEW YORK GLENDALE, CALIFORNIA SUBSIDIARY OF d1GN /2c COIL

2 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Facts and Figures Round -Up ELECTRONIC August, 1955 INDUSTRIES TOTALS 1500 1500 MI 00 1400 RADIO E TELEVISION RECEIVER i IN 1300 300 PRODUCTION MI zoo Ç1200 A MAI loo g 1100 1950 -1955 1000 2 1000 / 900 ASA 11/41R1M 900 sao Wir 'MI E.II-V =ItlVA Soo u, _ too Q 100 / 1/ _w 600 j 600 .. _ 7f/.Y/,I , 500 tu CJ 500 l,/ t.r 400 yV 4111111111 400 _ w TELEVISION -- 7 SETS , \ 300 300 ww - 1954 7955 200 _ 195 0 1951_- 1952 1953 roo VJ- l/J,F,M,A,M,J,J,A,5,0,N,13 J,F,M,A,M J,F,M,A M,J,J,A,S,O,N,D S,0N,D J,F,M,A,M,J,J,A,S,0,N,D J,FM,AM,J,J,A,5,O,N,D 100 100 / . Post II British Radio Exports AVIATION INDUSTRY SURVEY WW As provided through the Radio Industry Council, London, England results from a Here are some preliminary 30 MILLION 0(29,200,000 survey now being made to all airframe of manufacturers: Number questionnaires sent out 35 c425,800,000 Number returned at presstime 15 25 Questions & Answers: ol;` 24,500,000 1. We (are) (are not) a prime weapon sys- ot 22,200,000 tem contractor 9 are 6 are not ...... 20 2. We (do) (do not) manufacture electronic equipment /components for our own aircraft . . . 4 manufacture both; 5 manu- 17, 800,000 facture equipment only; 6 do not manu- 15 facture either 3. We (do) (do not) manufacture electronic equipment /components for aircraft other of 14:10(4000 c4 than our own manufacture . .. 2 manu- 10 facture both; 2 manufacture equipment only; 11 do not Ge7,800,000 4. We (do) (do not) manufacture electronic equipment /components for non -aircraft 5 applications . . . 3 manufacture both; 2 manufacture equipment only; 9 do not; ot 2,000,000 1 no reply Total number of electronic engineers em- 0 ployed from all cos 2245 1938/39 1946 1947 1948 1949 1950 1951 1952 1953 1954

GOVERNMENT ELECTRONIC CONTRACT AWARDS This list classifies and gives the value of electronic equipment selected from contracts awarded by government procurement agencies in June 1955.

Actuators, etc. 55,443 Generators, training 64,245 Receiving Sets, radio 230,643 Adopters 180,000 Gunfire Control Systems 3,693,887 Recorder -Reproducers 412,427 Amplifier, indicator, etc. 119,000 Handset -Headset 48,875 Regulators and Generators 452,792 Amplifiers 85,377 Headset, microphone 319,780 Relays 142,752 Analyzers, digital 29,995 Indicators 1,561,268 Repair Parts, gyro compass 27,120 Antennas 93,134 Indicators, control 80,057 Repair Parts, indicating equipment 26,526 Antenna Assys, etc. 1,982,583 Indicators, Spare Parts, etc. 281,502 Repair Parts, turbine generators 38,050 Antenna Filter Assys 84,481 Indicators, temperature 192,429 Resolver Equipment, infrared 71,560 Batteries, dry 2,399,030 Indicators, tachometer 141,585 Servos 38,674 Battery Chargers 566,655 Inverters 69,888 Sets, sound measuring 45,105 Brushes, Rotors, Shunts, generator 420,411 Nit, microphone, dynamic 117,309 Shield Assys 82,527 Cable 225,623 Loop Assys, Indicators, etc. 1,176,175 Soldering Equipment, induction 31,808 Cable Fittings, etc. 250,000 Loudspeakers 40,673 Sonobuoy Dispensers 2,043,632 Coil Assys 98,920 Magnetos, telephone 51,376 Spare Parts, etc., radar set 1,775,725 Coils 28,200 Magnetrons 51,750 Stroboscopes 35,937 Components 4,117,511 Meters, of power 75,650 Switches 34,413 Components, interphone system 880,595 Meters, frequency 201,433 Switches, tilt 39,652 Components, radio altimeter 39,814 Modifications, computer 34,405 Switchboards, telephone 44,115 Controls, radio set 45,105 Modifications, twin mount 288,134 Switch- Presses 104,264 Control Systems, rocket Motor Generators 91,872 Tapes, "Univac" 32,125 combustion chamber 43,186 Motors 44,100 Teletypewriter Sets 88,968 Covers, battery 35,808 Multiplexers 564,725 Testers 94,690 Coupler, directional 80,304 Oscillators 542,217 Testers, auto pilot 40,897 Crystal Unit 45,991 Oscillators, test 150,204 Testers, gun, bomb, rocket 102,598 Deceptive Jammers 116,265 Panels, Controls, etc. 65,491 Testers, flight direction system 203,733 Digital Reduction Systems 33,784 Power Meter, frequency 150,726 Test Sets 412,580 Direction Finder Sets 154,894 Power Supplies 757,678 Training Equipment, electronic 191,913 Dynamometers, etc. 37,094 Power Supplies, dynamotor 32,787 Transformers 116,980 Enclosure, electromatically shielded 199,792 Processing Equipment, pulse data ... 60,000 Transmitters 410,281 Exciter Systems 212,153 "0" Meters 27,198 Transmitters, fuel flow 473,970 Frequency Converters 61,582 Radar Sets 15,386,745 Transmitters, pressure 52,032 Generators 3,414,761 Radar, Signal Simulators, etc. 302,510 Transmitters, radio 30,105 Generators, adt. 192,607 Radio Equipment 94,475 Transmitters, radiosonde 29,582 Generator Assys 29,520 Radio Sets 1,774,328 Transmitting Sets 7,164,735 Generators, signal 906,750 Radiosondes 1,183,716 Tubes, electron 895,458 Generators, signal and oscilloscope, Radomes, arctic 64,400 Vibrators 485,824 CRT. 32,068 Receivers, radio 911,433 Wire, electric 141,197 Generators, tachometer 28,594 Receiver -Transmitters 646,759 X -Ray Apparatus 34,800

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 3 www.americanradiohistory.com RAYIH EON the world's foremost producer .t SEMICONDUCTORS

presents this comprehensive range of Raytheon DIODES, having the characteristics and the uniformly dependable performance that warrant your complete confidence and your specification as first choice Preserve this Ready Reference Chart

You'll find it a useful and dependable source of up -to -date information on Raytheon Diodes. RAYTHEON MANUFACTURING COMPANY

Home Office: 55 Chapel St., Newton 58. Mass.. Bigelow 4 -7500 For application information write or call the Home Office or: 9501 Grand Ave., Franklin Park (Chicago), Ill., TUxedo 9-5409 589 Filth Avenue, New York 17, New York. PLaza 9 -3900 622 South La Brea Ave., Los Angeles 36, Calif.. WEbster 8-2851

RELIABLE SUBMINIATURE AND MINIATURE TUBES SEMICONDUCTOR DIODES AND TRANSISTORS NUCLEONIC TUBES MICROWAVE TUBES RECEIVING AND PICTURE TUBES

4 For product information, use inquiry card en last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com RAYTHEON POINT CONTACT GERMANIUM DIODES These diodes combine good transient response. low capacity and high frequency capabilities with low cost and dependability. Ambient temperature range -50 to +1O0°C. Average Peak Type Peak Rectified Rectified Maximum Inverse Currents Forward Dimension Inverse mA .mA in µA mA `' General Purpose Outline Volts (max.) (max.) at -5v at at _i_ -10v -50v at -100v at +Iv N66 (C1(705) A 60 50 150 50 800 5. N67 A 80 35 100 5 50 4. N68 A (CK708) 100 35 100 625 3. -r- 14294 (CK705A) A 60 50 150 IO 800 5. N297 (CK707) A 80 35 100 10 100 3.5 N298 (CK7I3A) A 70 50 150 250µA (max.) at -40v. (50 °C) 30mA (min.) at +2v. CK801 A 60 50 150 50 s á 5. K CK802 A 80 50 150 100 7.5

VHF and UHF 1N82A B 5 50 150 UHF mixer 14 db max. noise - see data sheet for test circuit 114295 (CK706A) A 40 35 125 200 I Video detector CK715 A 40 35 125 Special tests for VHF to UHF keg. multiplier A Multiple Assemblies CK709 C Four 11466 matched within 2.5% at +1.5 and -10 volts for bridge circuits CK711 C Four 11467 matched from 0 to +3 volts. 30µa (max.) at -50v. for bridge circuits 0 0aa CK717 C Four 11466 matched within 2.5% at +1.5 and -10 volts for common anode circuits CK719 C Four 11467 matched from 0 to +3 volts. 30µa (max.) at -500

RAYTHEON GOLD BONDED GERMANIUM DIODES This group of diodes features small size, high forward conduction, high back resistance, and good temperature characteristics. Because junction area is increased over that of point contact types, capacityis slightly higher, transient response slightly slower.

Peak Average Peak Ambient Inverse Rectified Rectified Maximum Inverse Currents Forward Temperature Dimension Volts mA mA i µA mA Range Type Outline (max.) (max.) (max.) at -I0v at -20v at -50v at -100v at 0.8v at 1.0v °C

114305 (C K739) D 60 125 300 2.0 20 100 to -.I 1.- 0.071 -55 +70 119306 (C K740) D 15 150 300 2.0 100 -55 to +70 114307 (CK742) D 125 50 300 5.0 20 100 -55 to +70 B 111308 (CK741) A 10 100 350 500µA at -8 volts 300 -55 to +90 114309 (CK747) A 40 100 300 100 100 - 55 to +90 114310 (CK745) A 125 40 100 20 100 15 -55 to +90 114312 (CK748) A 60 70 250 50 30 -55 to +90 114313 (C049) A 125 40 100 10 50 15 -55 to +90

Note: IN305 -6 -7 have very high back to forward ratio, hig back resistance, sharp Zener characteristic, average transient response 114308.13 have good transient response with good forward characteristics, high back resistance

RAYTHEON BONDED SILICON DIODES Raytheon Bonded Silicon diodes provide high back resistance, a sharp Zener cha acteristic and fair transient response (large overshoot, fast recovery) over an ambient temperature range of -55 to +150 °C.

C 100 °C Max. Peak Average. Peak Maximum Reverse Currents Forward Average Reverse Dimension Inverse Rectified Rectified in pA mA Rectified mA Type Outline Volts mA mA at -5v at -10V at Volts shown at -1v mA at -10v

114300 (CK735) D 15 40 120 0.001 8 15 0.01 IN301 (CK736) D 70 35 110 0.01 0.05 at -50 5 12 0.2 114302 (CK737) D 225 25 80 0.01 0.2 at -200 1 8 0.2 IN303 D (CK738) 125 30 100 0.01 0.1 at -100 3 10 0.2 114432 (CK856) D 40 40 120 0.005 10 20 0.05 I N433 (CK860) D 145 30 100 0.03 0.3 at -125 3 15 0.5 114434 (CK861) D 180 30 100 0.05 0.5 at -160 2 15 1.0 114438 (C8852) D 7 100 200 IO 50 50

8 volt Zener regul for Note: All ratings at 25 °C unless otherwise indi ated.

RAYTHEON SILICON POWER RECTIFIERS This new Raytheon silicon rectifier is the first to give high Current rectifying capacity in extremely small volume. The rectifiers 1 operate to 75°C, to 200 volts peak and to over 99% efficiency. Back to forward resistance ratio is over 100,000. D

Maximum Current - Type Typical Dimension Maximum Voltage Peak Average Dissipation Outline RMS Volts Peak Volts Amperes Amperes Watts

CK775 E Case Temp. 30 °C 40 60 50 15 40 Case Temp. 170 °C 40 60 15 5 10 No Heat Radiator Ambient Temp. 25 °C 40 60 6 2.0 3.0 o Ambient Temp. I70 °C 40 60 2.0 0.5 0.5 CK776 E Case Temp. 30 °C 125 200 50 15 40 Case Temp. l70 °C 125 200 15 5 10 No Heat Radiator Ambient Temp. 25 °C 125 200 6 2.0 3.0 Ambient Temp. 170 °C 125 200 2.0 0.5 0,5

ADDITIONAL RATINGS (25 °C) Both CK775 and CK776 have maximum E drop at 5 amperes of 1.5 volts CK775 has maximum reverse current at -60 volts of 25 mA CK776 has maximum reverse current at -200 volts of 25 mA 'maintained by external heat radiator

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last Page.' 5 www.americanradiohistory.com FOR TELE -TECH & Electronic Industries TEMPERATURES M. CLEMENTS DR. O. H. CALDWELL Publisher Editorial Consultant

BERNARD F. OSBAHR ALBERT J. FORMAN Editor Associate Editor DR. A. F. MURRAY JOHN H. BATTISON Contributing Editor Contributing Editor B. V. SPINETTA, Directory Editor FRANKLIN RYAN, Assistant Editor CARL THOMAS, Assistant Editor R. C. DAVIES, Washington News Editor CHARLES F. DREYER, Art Director PATRICIA SOUTHWICK, Editorial Secretary STANLEY GERSTIN Contributing Editor

BUSINESS DEPARTMENT

HOWARD A. REED, Vice President 8 General Sales Manager JAMES S. COLEMAN, Asst. Sales Manager JOSEPH DRUCKER, District Manager CHARLES S. ROEVER, District Manager PAUL J. CARNESE, Sales Promotion Manager N. McALLISTER, Asst. Business Manager CECILIA KAVANAUGH, Advg. Records MARTHA USDIN, Production Manager 480 Lexington Ave., New York 17, N.Y. Telephone PLaza 9 -7880

Caldwell -Clements Inc. Western Office 201 N. Wells St., Chicago 6, III. Telephone RAndolph 6 -9225

CHRIS DUNKLE & ASSOCIATES California Representatives 3257 W. 6th Street, Los Angeles 5, Calif. Telephone DUnkirk 7 -6149

ELMER DALTON, Circulation Manager Bradley Rectifiers now available A. H. POND, Controller for continuous operation at 150 °C Member "I-Iellishly High" is used in a comparative sense, of course. But the fact remains: Bradley's SS series of high -vacuum processed Selenium Rectifiers was developed to perform as CIRCULATION NOW 27,000

rated at ambient temperatures of 150° C. An increase of 5,000, effective with the Janu- C without any ary 1955 issue, provides greater penetration Life tests have passed 4200 hours at 150° of plants, stations and laboratories in the The units undergoing tests primary markets of the industry- Manufactur- indication of cell deterioration. ing, Broadcasting and Armed Forces procure- comprise four Bradley SS series R- cells, experimentally rated ment. at 13 volts, operating with an a -c input of 52 volts under a These are the markets with greatest buying power and greatest expansion, industrially resistive load of 50 milliamperes. Available cell sizes range and geographically. from diameter to 5" x 6" plates. 3/16" The circulation of TELE -TECH is increasing in Our representative will be glad to discuss the application of two ways: 1- Growth of TELE- TECH's Unit Coverage of Bradley' High Temperature Rectifiers to your application. top -ranking engineers -the magazine's test results are available upon request. basic reodership, presented for compli- Curves showing mentary subscriptions. Please write for them. 2- Making paid subscriptions available to other engineers in research, design, production, operation and maintenance.

Although currently effective, the increased Manufacturers of Metallic Rectifiers and Photoelectric Cells circulation cannot appear i audit statements until the first half of 1955 n is audited.

BRADLEY LABORATORIES, INC. THE ELECTRONIC INDUSTRIES B DIRECTORY 170A Columbus Ave., New Haven 11, Connecticut LABORATORIES, INC. Published annually as an integral section of TELE -TECH in June

6 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com TV camera action ever known wii

CAMERA EQUIPMEN GRAVITY BALANCES ROCKER TYPE PAN AND TILT HEA

You'll know what we're talking about the instant you fry it! new RCCKER Heed has almost gyroscopic action, smooth, effortlt No Icnger do you have to fight spring balance to make your ti

You establish absolute balance by positioning camera ROCKER head plolform and adjusting center of gravity with vern control. Long and short lenses are compensated for w vernier adjustment. Prompting device may be added and balanc easily. Convenient brake handles and locking dey for pan aid tilt tension. Fits standard tripod and dolli 1i5hter in weight -and more economical in prii See it -test it -it's a "must

Accessories that SURPASS accepted standards- for Studio, Mobil and Micro -Relay Equipme

NEW PORTABLE 3 -WHEEL

New Model C BALANCED TV Head provides correct COLLAPSIBLE DOLLY Dolly folds to fit center of gravity in a FLASH- without groping. No matter what focal into carrying case -18 "x12" Weighs Has length lens is used on x36': only iO lbs. the turret, the camera wheel in rear for steering, may be balanced by which may be socked for the positioning handle straight dallying. without loosening the la. camera tie -down screw. Something every camera- DOILY II man has always desired. COLLAPSED

Famous BALANCED TV Head MICRO RELAY supporting a IV camera. Both are mounted on one of Micro wave relay beam our all -metal tripods, reflector head, also metal which in turn is mounted tr pod. Head is perfect for on a Ceco Spider Dolly. parabolas up to 6 ft. Here is a "team" outstand- diameter, withstands torque ing for versatility and spec's environmental treated. maneuverability in studio Tripod legs work in unison, or on location. one lock knob, spurs and rubber foot pads included.

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WRITE FOR COMPLETE ILLUSTRATED BROCHURE Dept. T -6 -15 1600 Broadway New York City

www.americanradiohistory.com

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This power -type wire wound axial -lead cost, eliminate extra hardware, save time Blue Jacket is hardly larger than a match and labor in mounting! head but it performs like a giant! It's a Axial -lead Blue Jackets in 3, 5 and 10 rugged vitreous- enamel coated job -and watt ratings are available without delay like the entire Blue Jacket family, it is in any quantity you require. * * * built to withstand severest humidity performance requirements. SPRAGUE WATTAGE DIMENSIONS MAXIMUM TYPE NO. RATING L (inches) D RESISTANCE Blue Jackets are ideal for dip- soldered sub -assemblies ... for point -to -point wir- 151E' 3 iv ",S, 10,000 2 ing ... for terminal board mounting and 27E 5 11/4 -ns 30,0001I 4 processed wiring boards. They're low in 28E 10 1 is i 50,000 S2 Standard Resistance Tolerance:

SPRAGI1E WRITE FOR ENGINEERING BULLETIN NO. 111 B

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g For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com As We Go To Press...

Ariz. Electronic Industry turing; W. L. James, manager of GE Pushes Broadcast Sales Hit by Tax Ruling sales; and C. H. Hildebrand, purchasing agent. An all-out sales push in the highly In a decision immediately greeted competitive television- broadcasting- as a blow to development of Arizo- equipment industry is promised by na's budding electronics industry, Britain's Commercial TV the General Electric Co. with dis- the Arizona Tax Commission upheld Opens Next Month closure of the reorganization of its (June 28) a state sales tax assess- national sales force. The reorganiza- On Sept. 22 the first independent tion involves creation of three new ment against AiResearch Manufac- commercial television station in Brit- turing Co., producer of electronics positions, northeast, southern and ain will start transmitting its pro- western regional sales managers, devices, on the contention that sales grams. At Beaulieu (pronounced to the federal government are tax- appointment of men to fill two of Bewley) Heights, Croydon, a suburb these positions, and naming of three able. of London, the new station will serve of new district sales managers. Terri- Stanley Womer, manager the an area in which about 10 million Arizona torial sales assignments have also State Development Board, people live. By March, 1956, two predicted there would be a "tend- been changed to increase sales ef- other commercial stations will open, fectiveness. ency for electronics firms, planning in the Midlands and Lancashire. to move here, to remain where they The new appointments are John These three commercial stations will Wall of Cincinatti as northeast re- are until the law is changed." The bring almost 60% of the total popu- assessment of 2% sales tax on sales gional manager; Charles T. Haist of lation of the United Kingdom within San Francisco as western regional to the federal government will put reach. Arizona firms on a "competitive dis- manager; Lewis F. Page of Wash- advantage" with companies from Bendix Expands ington, D. C. as district manager in other states. the Virginia- Maryland area; Earl H. The state agency's assessment was Construction of a new $2,000,000 Platt of Syracuse, New York, as dis- based on a 1954 state law which engineering building at Towson, Md., trict manager in the Kentucky -West omitted a previous exemption on devoted to expanded research and Virginia area; and Vernon H. Rus- sales to the federal government. The development on commercial and sell of Seattle, Washington, as dis- firm must now pay about $14,000 for military radar and other communi- trict manager for the northwestern the sales period starting July 9, 1954, cations and navigation devices, has states. when the new law went into effect been announced by the radio divi- until Dec. 31, 1954. Amount of sales sion of Bendix Aviation Corporation. taxes AiResearch must pay this year The ultra- modern structure is de- GE Producing have not yet been determined. Some signed to accommodate 500. Image Orthicons 200 machine shops in the Phoenix area have been supplying the firm with tax -free parts, and the company presumably will have to absorb the taxes. Automatic Transistor Factory At Westinghouse A new Westinghouse Electric Cor- poration manufacturing plant, described as "the most highly automatic of any of the company's plants," will be built at Youngwood, Pa. and will employ between 400 and 500 persons by the end of 1956. Bruce D. Henderson, Westinghouse vice president, said the multi -million dollar plant is expected to be completed by late 1955. It will be devoted to the manufacture of semi -conductor devices such as transistors, power rectifiers, high frequency detectors, and photocells. Manager of the new semi- conduc- tor department and plant will be L. R. Hill. Other key appointments announced include: Dr. S. J. An- Factory production of image orthicons is now under way at GE's Schenec- gell°, manager of engineering; Dr. tady tube plant. Here operator is shown adjusting target and mesh sec- L. L. Friend, manager of manufac- tion in tube using 17 -in. screwdriver. Previously RCA was sole producer.

TELE 9 -TECH & ELECTRONIC INDUSTRIES Auaust 1955www.americanradiohistory.com As We Go To Press (Continued) New Color -TV Dolly

Thompson $ $ $ High Accuracy for Ramo- Wooldridge Tube -Tester A tube -testing instrument report- The Ramo- Wooldridge Corpora- edly with versatility and accuracy tion, 8820 Bellanca Avenue, Los An- approaching that of factory tube geles 45, California, electronic and testing equipment, has been intro- guided missile affiliate of Thompson duced by the RCA Tube Division. Products, Inc. announces a $20 mil- Intended primarily for produc- lion financial arrangement between tion -line and laboratory tube testing the two companies. Through pre- of receiving and small industrial and ferred stock and long term revolving transmitting tubes, the WT -100A credit, made available by Thompson MicroMhoMeter makes it possible Products this money will finance the for the user to test tubes under continued rapid expansion of the Los actual operating voltage and current Angeles firm, which in less than two conditions. This feature permits a years has grown to an employment direct correlation of test results with Under the guidance of Chief Engineer Lindsey level of nearly 1000. data supplied by tube manufacturers. Riddle, (left), WDSU -TV, New Orleans outlet is color TV facil- 150,000 of now broadcasting with complete With sq. ft. completed In addition, the WT -100A can be set ties. John Newton, (right) representing Studio laboratory space in Los Angeles, two up to provide the operating voltages Television Products Sales Corp. of New York, new buildings under construction, of a circuit of specific design to de- inspects the new pneumatic color -dolly manu- and plans already drawn for a man- termine quickly and accurately the factured by his firm, used in conjunction with ufacturing plant one of the studio cameras. The new unit re- in the midwest, performance of a tube under desired portedly has held programming costs down sig- Ramo- Wooldridge appears destined voltage conditions. nificantly. One man can achieve the effects of a to move rapidly into such commer- The new instrument measures two -man dolly shot and simulate the "boom" cial and military fields as automation, transconductance with an accuracy action of a camera crane. A 33 -in. wheelbase and wider steering guide, plus an electric col- electronic computers, guided mis- of better than 5 %. Measurements umn brake for pre -selected or free -wheeling siles, transistors and semi- conduc- can be made up to 100,000 micro - elevation adjustment, combined with the in- tors, weapons control systems, and mhos in 6 ranges. In addition, the herent advantage of pneumatic- balance, make advanced communications. While WT -100A permits the measurement the dolly versatile. majority ownership and control of of ac heater currents including 600 - Ramo- Wooldridge remains in the ma series - string tubes at rated volt- hands of its key employees, terms ages. The meter, which is protected Cabinet TV Antenna of the new agreement provided electronically from burnout, meas- Thompson Products with option ures electrode currents up to 300 ma rights which in the future could in- in 11 ranges, including an ultra -sen- A lesson learned in the develop- crease the Thompson interest in Ra- sitive range of 0 to 3u amp, and ment of radar has been applied mo- Wooldridge to 84 %. voltages up to 300 volts in 15 ranges. profitably in television set design. Faced with the old problem of overcoming the shielding action of metal television cabinets on built -in an- Western Gear Personnel Form Electronic Club tennae, GE engineers have come up with the simplest type of solution. Not only have they overcome the original problem, but the solution offers superior built -in antenna performance. Rather than installing the familiar loop antenna in their metal cabinet TV sets in such a way as to minimize the shielding action of the cabinet, they have made the entire cabinet an integral part of the antenna system. Thus, the table and console models in metal cabinets, just announced, have a much larger antenna area than had ever been thought possible. Radiation from the set, engineers say, presents no unusual problem. The final solution was suggested by the cavity resonators used in radar equipment.

The Western Gear Electronic Club has been formed to provide amateur liaison in emergency civil defense programs as well as participation in normal "ham" activities. The club will also tie MORE NEWS in with appropriate Army and Navy amateur activities. Jennings David, chief engineer of Western Gear's Electro Products Div., hos been named president. Glenn W. Malme is at left. on page 12

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Raytheon Backward Wave Oscillator Series

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Microwave and Power Tube Operations, Section PL -313, Waltham 54, Mass. Excellence in Electronics

Raytheon Makes: Magnetrons and Klystrons, Backward Wave Oscillators, Traveling Wave Tubes, Storage Tubes, Power Tubes, Receiving Tubes, Transistors

use inquiry cord on lost page. TELE -TECH & ELECTRONIC INDUSTRIES Auqust 1955 For product information, 11 www.americanradiohistory.com (Continued ) Aircraft Firms Test As We Go To Press Solderless Connectors A series of tests was recently con- tance of 200 miles Power Plus about and buoy ducted over a two week period at the the end. "After we buoy the end, we Aircraft Marine Products plant in will proceed to Erith, England, and Harrisburg, Pa. to provide the na- load 1,200 miles of deep cable." -sea tion's five major airframe manufac- With the additional cable picked up to the return turers with information on how at Erith, vessel will to the determine the applications of con- buoyed end about August 11 and lay nector devices equipped for taper the second segment, spanning the pin solderless connectors. Atlantic to a point about 500 miles off Scotland. More cable will then be picked up in England and the Gap to Scotland closed by late September or early October. Next summer the laying operation will be repeated in reverse, from New silicon power rectifier in foreground devel- Scotland to Newfoundland, to pro- oped at Bell Telephone Labs does same job as seven selenium units shown in rear vide the second cable needed for the first physical voice link between this Electronic Golf Ball continent and Europe. Transatlantic telephone service is now provided Latest in the way of inventions to by radio circuits. ease the burdens of modern man is When the cable system is in opera- a non -loseable "golf ball" used by tion, about 4,000 volts, or approxi- Dan Noble, vice -pres. of the Com- mately two volts a mile, will be munications and Electronics Div. of needed to make voice transmission Motorola, Inc., to demonstrate the over the sprawling system possible. possibilities of transistors. Half of this power will be generated Mr. Noble had his engineers pro- in Clarenville and half at Oban, the Connectors undergoing vibration test duce a complete broadcasting set us- eastern terminus. The use of taper pins with A -N ing one of the standard transistors connectors does away with soldering manufactured by Motorola. The set and the attendant problems of wires was designed to fit inside a plastic New TV Tower breaking at the solder pots and the "golf ball" just about the size of a limitations of ambient temperature. regulation ball. Automatic machinery demon- Bouncing the ball on the floor strated by A -M P crimps pins to wire demonstrates the shock resistance of at rates of up to 4,000 per hr. The transistors. The size feature is obvi- final joint, made when the pin is ous, for a single tube used in a seated in its receptacle in the con- standard transmitter is larger than nector, is claimed to be equal to or the golf ball, transmitter and all. better than soldered connections. Despite its size, this unit transmits The taper pins, which have al- a sufficiently strong radio frequency ready received military approval for signal to be picked up by a portable, use in guided missiles, are now be- pocket -size receiver. By merely ro- ing considered for more widespread tating the receiver as a direction applications. finder, the location of the lost "electronic golf ball" can easily be determined. Computer Automates At Allstate Insurance New Ocean Cable HMTS Monarch has left Claren- ville, Newfoundland, laying the world's first transoceanic repeater telephone cable at the rate of about six nautical miles an hour following the Great Circle course eastward over a 2,000 nautical mile route to Oban, Scotland. The telephone cable system, scheduled for service late in 1956, is a joint undertaking of American Telephone and Telegraph Company, the British Post Office and A3statt Insurance Co. has announced insta'- ILre is an artist's conception of a helicopter I.ition of a "Datatron" digital computer at its the Canadian Overseas Telecommu- view of the 1521 foot tall TV antenna tower Skokie, Ill. home office to simplify the paper- nication Corporation. now under construction for stations WFAA -TV and work involved in automobile, personal liability J. S. Jack, Scarsdale, N. Y., A. T. KRLD -TV at Dallas, Texas. When completed in and fire insurance operations for over 3,000,. August, will be & T. engineer -in- charge said the the structure taller than the 000 policyholders. Manufactured by ElectroData Empire State. It was designed and fabricated Corp. of Pasadena, Calif. the quarter -million Monarch would pay out cable to the by the Dresser -Ideco Company of Columbus, Ohio, dollar data processing machine has been oper- edge of the Continental Shelf, a dis- one of the Dresser Industries. ating at Allstate for four months.

12 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com '144110 `., 0iàoEwe> .:. but POSITION alvìilnd'ünl

Thanks AUTOMATIC SHORT -RANGE ROUND OSITION NDICATOR

ACCURATE! INSTANTANEOUS! Developed Specifically for LIGHT AIRCRAFT and HELICOPTERS. A new dead reckoning navigational computer - AUTOMATICALLY indicating ground position - derived from airspeed, heading and wind. TOTAL SYSTEM WEIGHT - 1 8 LBS.

LORAL- Serving in AVIONICS

AIRBORNE NAVIGATIONAL EQUIPMENT COMMUNICATION SYSTEMS RADAR EQUIPMENT TEST EQUIPMENT 118

LORAL ELECTRONICS CORPORATION 794 EAST 140th STREET NEW YORK 54, N. Y.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 13 www.americanradiohistory.com GUIDING GENIUS for airplanes north of nowhere !

Photo: Philip Gendreou

In all the geography of the skies, no long -range air- ... and then displays aircraft position continuously craft need ever again lose its way ... even if earth from instantaneous calculations. and stars zero out, and the radio beam has said To the nation, this GPL development means good -bye ... even if the plane flies hundreds of even stronger air defenses, aided by a guiding miles off course to evade sudden storm or inter- genius that reads global skies like an open book. ception. To engineers and the aviation industry, it in- A new navigation device, with a cybernetic brain dicates the leadership of GPL in research and ad- and a "take- it -or- leave -it" attitude to the mag- vanced instrumentation. tells crew members exactly where in the netic pole, Engineers: Write for employment information world they are at any instant of the flight. Developed by General Precision Laboratory in GENERAL cooperation with the Air Force, this complex elec- PRECISION tronic- mechanical device keeps a minute by minute LABORATORY diary of the plane's speed - in cruising, descent or Incorporated Pleasantville, New York climb records faithfully every shift in course ... A SUBSIDIARY OF GENERAL PRECISION direction ... notes each change in wind velocity EQUIPMENT CORPORATION

For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com THEY'RE HERE! THREADED PERM -TUNING CORES ... Economy 32 PITCH SHALLOW THREAD - TWICE (SHOWN D10 x 45' CHAMFER ACTUAL SIZE) ± 010 BOTH ENDS 32 32 engineered by

I111i 111111111111 P'I GENERAL IUU UUUUUU hl CERAMICS A tb, - SCREW DRIVER SLOT BOTH ENDS to M. P. A. PART. NO. DIMENSION A Standard 11 -53T F606-1 .250 Following two years of inten- EE-F606-2 .375 sive research and development EE-F606-2 by General Ceramics specialists, three standard threaded perm- tuning cores are now (SHOWN TWICE 32 PITCH SHALLOW THREAD .010 x 45° CHAMFER 1 available from stock. These ACTUAL SIZE) +.oto ±.oto BOTH ENDS 16 - 16 standard cores are offered in several lengths to meet in- SC9111 11111111 Illd'S' -8 dustry's diversified require- ü1U0 00UU UUill R +' It ments. Call, wire or write for .093 quotations, today! A X64 ±.005 SCREW DRIVER SLOT BOTH ENDS

PART. NO. DIMENSION A MAGNETIC PROPERTIES

EE-F607-1 .312 PROPERTIES UNIT "Q" (3"I

F607-2 .375 Initial Perm. 125 EE-F607-1 at 1 me/see.

`Max. Perm. 400

*Sat. Flux Density Gauss 3300

28 PITCH SHALLOW THREAD .010 x 45° CHAMFER *Residual Mag. Gauss 1800 BOTH ENOS *Coercive Force Oersted 2.1

Temp. Coef. of +I % / °C .10 max. ;1!l111!0l!t'.11!!l:.1!!l11._1 Initial Perm. ILU IIUUIIIII Curie Point + °C 350 t J HEI HOLE .104 !.005 A±6 Vol. Resistivity ACROSS FIATS ohm-cm. High

Loss Factor: 1 upQ At I mcs /sec. .000020 PART. NO. DIMENSION A At 5 mcs/sec. .000050

EE-F608-1 .375 'Measurements made on D.C. Ballistic Galvanometer with Hmax = 25 oersteds. Above data is based on nominal values.

CERAMICS CORPORATION TELEPHONE. VALLEY 6 -5100 GENERAL OFFICES and PLANT: KEASBEY, NEW JERSEY MAKERS OF STEATITE, ALUMINA, ZIRCON, PORCELAIN, SOLDERSEAL TERMINALS, "ADVAC" HIGH TEMPERATURE SEALS, CHEMICAL STONEWARE, IMPERVIOUS GRAPHITE, FERRAMIC MAGNETIC CORES

TELE -TECH & ELECTRONIC INDUSTRIES A!o ^-51 1955 For product intorrppt:sn. use inquiry or on last pale. 15 www.americanradiohistory.com YOU FURNISH THE PRINT, WE'LL FURNISH THE PART

5.000 - 3626 IA. MY NtH ANE s OF ART ERSIES 5 P SN 1.00/ PRUSED ° ^t "I .999 FOR Co ^sr ct rlc 2.000 Low Dielectric 25 26 Restoste rr StrengthStr Wolohan O 1 Otensile Strength Resistance 28 O A[c ` Compressive e +' Neat sistan trengthh F\exur O \ \ity O Stten9rlr K,ochinob '-4493 Shear O mole tGn9 Hardness THer .128-130 D /A. orPtio^ HOLES) U bs (2 Impact Fatigue Vibrorion Q O \0^01 .403 act Strene' pmens O Imp nce d ResisEa GOStObi SECT A-A Moisture ri PART Na. TITLE g Resisto ^ce Low thermol01 ty Con Che ei91rt O Ht Nd e `g strength Resistonc O W pie\edric tor O Q Fr J pissiP°0o^ A

CONTACT BLOCK OF-SYNTl1ÄNE LAMINATED PLAST/C-

: MEETS AlANY_..ELECT_RTCAL; MECHA.N!_CA_ G_RE_QU/REMENTS

This contact block -for an electronic device -illustrates The customer supplied the blueprint; Synthane Cor- the rising demand for materials with many properties poration did the rest-first producing the proper grade of in combination. High dielectric strength, mechanical material and then fabricating -accurately and without strength and dimensional stability are essential for the waste or delay. application; accurate machining is a must for proper The more than 33 grades of Synthane laminated plastics mating of components. offeryou a very wide range of properties in combination - physical, mechanical, electrical, and chemical. And good service and quality characterize Synthane fabrication.' The coupon will bring you further information and SYNTHANE CORPORATION, 11 River Road, Oaks, Pa. technical data covering Synthane sheets, rods, tubes, and Please send me more information about Synthone laminated molded parts, and Synthane service. plastics and the Synthane fabrication service.

Name Title SYNTHANÉ Company LAMINATED S PLASTICS Address

City Zone State SYNTHANE CORPORATION OAKS, PENNSYLVANIA

16 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com ,Q djusTroia,

Introducing A LOW -COST ADJUSTABLE TOROID

precise, instant adjustment truly hermetic sealing

inductance variation of 10% temperature coefficients same as fixed toroids eliminates critical close tolerance

capacitors no increase in case diameter high Q developed by Burnell, creators of no external power supply the Rotoroid®

Write for Adjustoroid Technical,ip(j Brochure A 55 LET BURNELL ENGINEERS SHOW HOW USE OF ADJUSTOROIDS REDUCES EQUIPMENT COSTS

Teletype: Yonkers, N. Y. 3633 See us at the WESCON SHOW, Booth 259 BURNELL & CO., INC. 45 Warburton Avenue Yonkers 2, New York Copyright patent applied for Pacific Division: 720 Mission St., S. Pasadena, Calif.

www.americanradiohistory.com in Standard Miniature Subminiature sizes

COMPLETE LINE of filters for every channel and band width ... in Standard, Miniature, Subminiature and "Tom Thumb" sizes ... many available from stock.

MINIATURIZED filters that save 80% space... retain all desired attenuation characteristics.

HERMETIC SEALING, OCTAL PLUGS and other new features. only Burnell offers you ..

SPECIAL PHASE LINEARITY characteristics to conform to new concepts of high accuracy PARTIAL LISTING OF MINIATURE TELEMETERING BAND PASS FILTERS telemetering practice. 15% 307. Gr Approx. Channel Rob Band Band AHenwlion Sin Weight Widlh Width SPECIFICALLY DESIGNED for telemetering, Type No. Type No. W. 4 H. 15% B. W. 30s/e B. W. these filters have found great utility in a 400 CPS. S -15456 40B -15% 408 -301/1 560 515457 515477 wide variety of communications and 2 6 a 2;4 3 Iba. 20DB -23% 20DB -46% 730 515458 S -15478 40DB -27% 40DB -54% control applications. 960 515459

1300 S -15460 3.5DB -15% 3.5DB 30% - APPLICATION ENGINEERING 1700 515461 11/4 a 41/4 21/4 I b. 7 oa 20DB -23% 20DB - 46% service plus 2300 S- 15462 40DB -27% 40DB - 54% complete technical literature. Write 2570 " S -15463 Dept. 4 ?.., for 102A. 3000 S -15464 Catalog 3900 " S-15465 S-15479 4500 5.15466 5400 " 15467 S-15480 7350 " S -15468 S -15481 10500 " S-15469 S -15482 308 - 15% 3DB -30% 12300 " 515470 5 1% a 3 a 21/4 934 os 2008 - 23% 200B -46% Teletype Yonkers, N. Y. 3633 14500 5.15471 S -15483 4008 - 26% 40DB - 52% 22000 " S -15472 S -15484 27000 " S -15485 30000 S-15473 5.15486 40000 " S -15474 515487 52500 " S-15475 70000 " S-15476 S -15488 First in Toroids INC. OPTIMUM OPERATING IMPEDANCES SOCKET TERMINAL CONNECTIONS BURNELL & CO., and Related INPUT OUTPUT YONKERS 2, NEW YORK

Terminals 1 & 2 500 ohms Terminals I & 6 500 ohms Networks Pacific Division : 720 Mission St., S. Pasadena, Calif. Terminals 1 & 3 10000 ohms Terminals 1 & 7 50000 ohms www.americanradiohistory.com ONE OF THESE

WILL FIT YOUR ELECTRONIC APPLICATION why not investigate today?

Howard 2900 Induction motor. For facsimile equip- Howard 3700 ment, tape recorders, Induction motor. blowers -used by Movie projectors, TV many leading cameras, tape manufacturers. recorders -Resilient mounted.

Howard 2500 Induction Motor. For instruments, Howard 512 Universal tuning devices, light Motor. Widely used switching, metering in business machines, devices, recordio- projectors, automatic graphs, damper tuning equipment, controls, telefax photo developing equipment and a host and printing, of other applications. automatic pilots, photo copy machines.

Howard 100 & 200 Universal & D. C. Motors. For blowers, radio Howard 2400 and radar equipment, Capacitor or 2 -Phase UNIVERSAL D. C. MOTORS aircraft pumps, Servo Motor. Used in AND 1/1000 to 1/2 h.p. aircraft cooling fans. servo type applications- tuning, SHADED POLE MOTORS meters, instruments, 1/2000 to 1/8 h.p. controls, etc. INDUCTION MOTORS 1/1400 to 1/4 h.p.

Here are just a few of the many fractional h.p. motors Howard can offer you for your quantity applications. To date, Howard motors have been used by leading manufacturers in more than 85,000 applications. Chances are there's a specification in our file that will work for you and at the right price. If you use fractional h.p. motors, write and tell us your needs today. We'll handle your inquiry promptly. DEPT. TT -8, HOWARD INDUSTRIES, INC., RACINE, WIS.

SALES OFFICES: 208 S. La Solle St., Chicago 4 942 S. La Brea Awe., Los Angeles 36 Room 4822, Empire State Bldg., New York I DIVISIONS: ELECTRIC MOTOR CORPORATION ( «) CYCLOHM MOTOR CORPORATION 1l RACINE ELECTRIC PRODUCTS

product information, use inquiry card on last page. 79 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For www.americanradiohistory.com of Los Angeles, Cal. Fairchild announces the opening a new plant in Los Angeles, California.

The new plant will expand the . manufacturing, sales and service activities of Fairchild's Potentiometer Division to provide equal facilities both in the East and the West. It will meet the growing need for its products by the expanding electronic and avionic industries on the West Coast. A complete line of potentiometers will be manufactured and the new plant will be staffed to provide complete engineering and fast delivery service.

See us at Booth 1206 -07 at Wescon Show

Hicksville, L.I., N.Y.

AVAI LABILITY AN 13 SERVICE from L.1. to L.A.

The opening of Fairchild's new West Coast plant means that henceforward the name Fairchild will not

only stand for the finest in precision potentiometers . . . it will mean faster delivery and better service, too. You will be able to get complete engineering service, quotations, order handling, delivery and repair from either plant, whichever is most convenient to you. This is another example of how Fairchild can always give you the answers, no matter what factors govern your choice of precision potentiometers. Write Potentiometer Division, Fairchild Controls Corp., a subsidiary of Fairchild Camera and Instrument Corp., Dept. 140 -66E.

EAST COAST WEST COAST 225 Park Avenue 6111 E. Washington Blvd. Hicksville, L.I., N.Y. Los Angeles, Cal. (7'l -R C419,Ç PRECISION POTENTIOMETERS

20 For product information, use inquiry cord on last page. TELE -TECH & ELECTRONIC INDUSIRIES August 1955 www.americanradiohistory.com INCOMPARABLE Frequency Stability... for Airborne X -Band Radar Receivers

the rugged VA -203.. . Now - at a New Low Cost - Varian announces GUARANTEED SPECIFICATIONS most advanced reflex klystron ever developed for airborne radar and 8500 to 9600 me VA -203 VA -201 beacon local oscillator service. The exclusive brazed -on external tuning V 250 V cavity provides frequency stability obtainable in no other klystron. This Resonator Voltage 300 construction provides outstanding stability during shock, vibration and Heater Voltage 6.3 V 6.3 V temperature cycling ... takes punishing 50 to 100 G shocks and provides Heater Current 0.45 Amp 1.2 Amp high WITHOUT pressurization. absolutely reliable operation at altitude Power Output 20mW, 15mW, Min Min For Super- Rugged Service (Shocks to 250G) ... Varian offers the VA -201 Tuning 30 Mc, 30 Mc, is with integral molded silastic leads, is similar Electronic klystron. This tube equipped Range Min Min to the VA -203 and performs with the same absolute reliability. Vibration FM at 1 Mc, 0.2 Mc, 10 G p-p, Max p.9, Max

Unique brazed -on external tuning cavity assures exceptional frequency stability. GET COMPLETE TECHNICAL DATA and Reliable operation at low voltage and from poorly regulated power supplies. specifications on the outstanding new VA -203 Negligible microphonics. and its companion VA -201 . finest kly- for airborne radar. Write to our tuning rate long tuning life single shaft tuner adapts easily strons made Slow ...... Applications Engineering Department today. to motor tuning. Withstands 50 to 100 G shocks (up to 250 G's for the VA -201) VA -203 weighs less than 4 ounces. Both tubes mate directly to standard waveguide flanges. VARIAN associates

P A L O A L T O io C A L I F O R N I A

Representatives in all principal cities

KLYSTRONS, TRAVELING WAVE TUBES, BACKWARD WAVE OSCILLATORS, R.F. SPECTROMETERS, MAGNETS, STALOS, U.H.F. WATERLOADS, MICROWAVE SYSTEM COMPONENTS, RESEARCH AND DEVELOPMENT SERVICES

For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 21 www.americanradiohistory.com Ii1111iN NIII ppi 91111 11111111 ä- °>tottomNÑIIÓIINIInumNOIIHIIÜÌfi1HpHHlo 111111111111111111111111111111 Ifls omt1NIIIIIIINIMIN/NNn111H11111HHIIIH111 N111NH!____ II/IIIIIINlllltllllli "IINIHHHHmiN 111aNil-HIINIIIIIHIIp111i1Nh//1m IIIHI INlplpnl1111 /Na/IIIINIININ /N111w111H11111HY1AMIIIIIIhIIIIIIII a1111H11111111111111 %11NIIINn11mINI1IIIOir IN;IUI IIIqi.N.NlTHYNNNINIUIIN 1111111111 1111I11 IIIaI'°t VINIlIr' , usn p^ ° rwflfl 11111i9 IIIIIIIIN I1111 111 '111l1. 11 11 It tuft 111111111111 MUMÌ MAP a 1111 II 1 Illilï 111111 In E/' 11 lull IIEIII lt '1111NNI IIHIIIIIIIIIIIIIC !t IU N N 1+ -,d 1a111 'H U 11 IHI Nlllr N 11 Ia11111111111111I=. 11.111 tf1 ,N ,L.r III 11W ieet. 1 pm. 1111111111111111119 1111' Ill' _ 1111H111NIIIH1111 ullinunnunlnlN /H m1lHalu 941111011111111111111 11a111111N11HIHi11_111111IpNIIINN á111111111NI1111HI1t1 INIIIIHHIHIp11/1N IRA IIINH 1111H1111p1 1E1 /fIH111N1H1H1111111 11®1.NIIIIIHNII 11 /N/I I 1 19ÌlÌÌÌÌÌ ÌIiIÌÌÌÌÌÌ,t.111IHNliN11ÑiiÌ11IpIN/p11.w.ssneraws,aee.wa.wea+oawe 111i 1 ÜIIIpI

RCA "PREMIUM" TUBES FOR CRITICAL MILITARY APPLICATIONS

RCA- 0A2 -WA (Voltage Regulator), 0B2 -WA (Voltage Regulator), 5751 -WA (High -Mu Twin Triode), 5814 -WA (Medium -Mu Twin Triode), 5727/2D21 -W (Thyratron, Gas Tetrode), 5654/6AK5 -W /6096 (Sharp -Cutoff Pentode).. six types recently added to the group of RCA "Premium" tubes produced under rigid quality -control standards. For government end use; supplied only against orders giving government contract number.

NEW TEST INSTR MENT ENABLES ACCURATE MEASUREMENT OF ELE TRON -TUBE TRANSCONDUCTANCE

RCA- WT -100A MIcRoMHOMETE ... unique in design, it makes possible the testing of tubes under actual o erating voltage and current conditions. This feature permits direct correlatio of test results with manufacturers' published HIGH -MU TRANSMITTING TRIODE data. Measures true transcond ctance, both control- grid -to -plate (gm) and IS TIME -PROVED RCA ORIGINAL suppressor -grid -to- plate. Also m asures electrode currents: plate, suppressor - grid, screen -grid and control -grid ac heater current; voltage drop across electron RCA -833 -A ... improved version of the 833 tubes, dry -disc rectifiers and cry tal diodes. originally developed by RCA more than 15 years ago. The outstanding and continuing RCA-WT-100A IS a laboratory- uality instrument designed for production -line popularity of this tube is typical of the many and laboratory testing, and ci uit design engineering. The versatility and time -proved transmitting, receiving, and accuracy of the RCA -WT -100A cl sely approaches that of tube factory equipment special for measuring transconductance. -purpose types originated, developed, and sponsored by RCA. The RCA -833 -A is de- The WT -100A features obsolescence -proof plug -in assemblies, switching for signed for use as an rf power amplifier, oscilla- sockets with as many as 14 pi1s, burnout -proof metering, and electronically tor, or class B modulator. It has a maximum regulated, heavy -duty power supply. plate dissipation ratingof 450 watts under I CAS operating conditions with forced -air cooling.

FOR TECHNICAL INFORMATION... Write RCA, Commercial Engineering, Section H -50 -R, Harrison, N. .1. Call your RCA representative: Use this coupon. Circle types you are interested in.

6161 6383 6448 3RP1 -A 6CM7 833 -A WT -100A EAST HUmboldt 5 -3900 744 Broad St., Newark I, N. J. Name MIDWEST W Hitehall 4 -2900 Position Suite 1181, Merchandise Mart Plaza, Chicago 54,111. Company WEST Address MAdison 9 -3671 420 S. San Pedro St., Los Angeles 13, Calif.

22 For product information, use inquiry card on last page. TELE -TECH 8. ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com MnlrHiel®IOGnar,frl®eurMWfT.ffflff o9Tmt11fflfififrin11im7f71771[.1sáY[Q1lätY f1111ar1llri11t11j11H1I111111Qi1111Ig111pp1111qq111auuilY ELECTRON TUBES MON %MMM1 {MN111IIIIi111108111NIIMIIINIIIIII1111M1I11101%ÖÑIIÑÌä Ú%ÑNIÌÌNÁIINÑÌÌfÑÌÌ1 K'Z-1'I"1[ _ .'^I:-----t mMM SEMICONDUCTOR DEVICES M N IN IÌ Ìr Ì1HIM ipl h AÌáÁ b '7. BATTERIES 111 iinl i. IN1 NEJ 11111 11 Al I/ III 1 IM M1. P 1 7 ALM ANI' » _rlL_Z_. MAL. ÁI ? ./r ®.i JL1d111 AH1i11 TEST EQUIPMENT p p NN i INIII IMHMaWMMIlN1u1lÁNM1iíiiiÑliiir111nnili AIIOOWIIIIINIIIMa1iü11®1M ELECTRONIC COMPONENTS IiiáiUMiñMii®iïiYWtYfYfWr.YY/flir/. iVIIiiiiiiiliiñi=i ..:._...-;-.a

GENERAL -PURPOSE 3" FLAT -FACE OSCILLOGRAPH TUBE

RCA- 3RP1 -A ... has small, brilliant, focused spot and high deflection sensitivity for its relatively short length. The screen is of the medium -persistence, green -fluorescence type. This tube provides a trace having high brightness when operated with an ultor voltage near the maximum of 2500 volts, and good brightness at relatively low ultor voltage. The flat face facilitates use of an external calibrated scale and minimizes parallax in readings.

TWO UHF POWER TRIODES FOR FREQUENCIES UP TO 2000 Mc

RCA -6383 ... liquid- and forced- air -cooled for UHF transmitter service. Has 600 watts plate dissipation and can be operated at full input ratings at frequencies up to 2000 Mc. RCA -6161 ... forced -air -cooled, with radiating fin construction. For UHF service in TV and cw applications. Has maximum plate dissipation of 250 watts. Operates at full input ratings up to 900 Mc, reduced ratings up to 2000 Mc. Both types for circuits of the coaxial cylinder type. Particularly suited for cathode -drive circuits. For service in aircraft and other applications where light weight, comp ctness, and high power output are prime design considerations.

NEW DUAL TRIODE WITH 12 KILOWATTS TWO DISSIMILAR UNITS OUTPUT AT 900 Mc RCA-6CM7 ... a medium -mu dual triode of the 9 -pin miniature type con- RCA -6448 ... a water -cooled beam power taining two dissimilar triodes in one en- tube with a unique design -is intended for velope. Unit No. 2 is a high -perveance operation as a grid- driven power amplifier at triade designed especially for use as a frequencies up to 1000 Mc. In color or black - amplifier. Unit No. 1 and -white TV service, it is capable of delivering vertical deflection is designed for use as a conventional a synchronizing -level power output of 15 Kw at blocking oscillator in vertical deflection 500 Mc or 12 Kw at 900 Mc. The 6448 is also The RCA -6CM7 also features a capable of giving useful power output of 14 Kw circuits. 600 -milliampere heater with controlled at 400 Mc or 11 Kw at 900 Mc as a cw amplifier warmup time, separate cathodes for in class C telegraphy service. the two units, and a basing arrangement which facilitates use in printed circuits.

RADIO CORPORATION of AMER /CA TUBE DIVISION HARRISON. N. J.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 23 www.americanradiohistory.com FILTERS)UR MILLIONTH FILTER SHIPPED THIS YEAR. OR EVERY APPLICATION

ELEMETERiNG ILTERS

oOB 'C manufactures a wide variety of TYPE CENTRAL FREOENCY 5 . AA nd pass filters for multichannel l' , 4682E 1695 CPS 4682E 2290 CPS lemetering. Illustrated are a group 10 4682G 2990 CPS filters supplied for 400 cycle to 4682H 3890 CPS 4682í 5400 CPS KC service. Miniaturized units 1 4682) 7330 CPS 20 ve been made for many applica- 25 Ins. For example a group of 4 cubic :h units which provide 50 channels C J 8 10 C 20 30 40 tween 4 KC and 100 KC. FREQUENCY Dimensions: (4682A) 11/2 x 2 x 4"

AIRCRAFT VOLTS VOLTS e 2 FILTERS 2000 2001 - UTC has produced the bulk of filters 16 .\MIt- I.If%..--1,- used in aircraft equipment for over a decade. The curve .2 IN11IN\TMM\ at the left is NMMINIIM that of a miniaturized (1020 cycles) 9 range filter providing high attenua- //111/\i tion between voice and range fre- .4 1111M=111111111 1111,411111\111111 quencies. Curves at the right are that of our o o 200 500 SEC 50rv fMt70 100 10 200 150 miniaturized 90 and 150 cycle filters nensions: FREOUENCY 134) 11/4 x 13/4 x 2-3/16". FREQUENCY for glide path systems. 100, 1) 11/4 x 14 x 13/8".

09 0B 9049 ARRIER o 0 ILTERS IIMIriTiTi1M o -1111111I111. 20 wide variety of carrier filters are MINIM ailable for specific applications. maim 40 is type of tone channel filter can

supplied in a varied range of band FAMMIIVIIMME CO dths and attenuations. The curves I/II1 \\\ own are typical units. El eo ec Dimensions: - (7364 series) 1% x 11/e x 21/4 ". (9649) 11/2 x 2 x 4 ".

4,,t101,1 6173 OB 61744 A 09 .30 ISCRIMINATORS .15 .20 .w ese high Q discriminators provide 10 .5 ceptional amplification and linear-

'. Typical characteristics available 5 e illustrated by the low and higher 10 0 ?.quency curves shown. 20

15 30 Dimensions: 10X0 1400 500 1600 1700 9 (6173) 1.1/16 x 13/s x 3 ". FREQUENCY FREQUENCY (6174A) 1 x 11/4 x 21/4 ".

ll 111 I T www.americanradiohistory.comE n T R A 111 IM P A R M E R net. Electronic Industries News Briefs

Capsule summaries of important happenings in affairs of equipment and component manufacturers

AERONCA MANUFACTURING CORP. of TILE HEILAND DIVISION of MINNE- D. W. ONAN & SONS, INC. of Minne- Middletown, Ohio, is looking into unex- APOLIS- HONEYWELL REGULATOR CO. apolis, Minn. have announced two new series plored fields in the aircraft industry to build recently announced plans for the construc- (25EC, 25,000 -watt and 35ED, 35,000 -watt) of the company into a major producer. Aeronca tion of a new $1,000,000 manufacturing plant Ford -powered electric generating plants. will expand its services to the U.S. Armed in Denver. The plant's 45.000 sq. feet will These new generators have been specially Forces into new fields of maintenance and house general sales offices and manufactur- designed to handle the many unusual elec- electronic development. ing facilities. trical requirements demanded of modern emergency equipment.

AIRBORNE INSTRUMENTS LABORA- ILLINOIS INSTITUTE OF TECHNOLOGY PANELLIT, INC., Skokie. Ill. has an- TORY, INC., Mineola, N.Y. has announced and ARMOUR RESEARCH FOUNDATION, nounced the formation of a Canadian affili- its entry into the metal- working and main cooperation with a group of engineering ate, PANELLIT OF CANADA, LTD. The chine -tool industry with the appointment societies and nearly 100 industrial organiza- new affiliate will be located at 60 Newcastle of the BURLEIGH and STOCKER MA- tions, will demonstrate the use of electronic St., Toronto 14, Ontario. CHINE TOOL CO. of Pleasant Ridge. Mich., analog computers in the solution of hy- as Sales Agents. draulic problems at the 11th annual Na- tional Conference on Industrial Hydraulics PERFECTION MICA CO. of Chicago, to be held Oct. 27 and 28 in the La Salle manufacturers of a new magnetic shielding in material, has announced the creation of a BELL TEL LABS, New York, N.Y., an- hotel Chicago. new division, the MAGNA- SHIELD DIVI- nounced recently the establishment of a fel- SION, to handle its product, Magna -Shield. lowship program through which it will grant The company is located at 1322 No. Elston funds for students doing graduate study in Ave., Chicago. electrical communications. To be known as KESTER SOLDER CO. of Chicago has re- the Bell Telephone Laboratories Fellow- cently expanded its plant facilities at New- ships, the awards are for study of one or ark, N.J. by more than 50 %. All phases of PYRAMID ELECTRIC CO., 1445 No. Ber- two years, leading to a doctorate. It carries the factory have been enlarged- manufac- gen, N.J., has made available in the solid a grant of $2,000 to the fellow, and an addi- turing operations, warehouse, and shipping dielectric glasseal capacitor line capacitors tional $2,000 to cover tuition, fees and other areas. The plant is located at 88 Ferguson capable of withstanding vibrational stresses costs to the institution at which he chooses St. in Newark. of high acceleration and frequency as well to study. as severe shock conditions.

THE KULJIAN CORP., Philadelphia engi- SANDERS ASSOCIATES, INC., Nashua, CARGO PACKERS, INC., Brooklyn, N.Y., neers and constructors, have constructed five N.H., designers and manufacturers of elec- specialists in climate -proof and shock -proof Mass Vibrometers of unique design for tronic and hydraulic servo components and packaging, has leased 65,000 square feet of E. I. DU PONT DE NEMOURS & CO. INC., systems, have purchased new office and new space in the three -story industrial which can automatically check the uniform- plant facilities totaling almost 500,000 sq. building at 3720 14th Ave., Brooklyn, N.Y. ity of thread over the entire range from 10 feet of space in Nashua. to permit further expansion of its shipments to 5700 denier in textile operations. of extra -heavy industrial machinery overseas. SOLAR ENERGY CORP. OF AMERICA has been formed to explore the commercial MAGNAVOX, Fort Wayne, Ind., president possibilities of solar energy. Its address is Frank Freimann recently announced that the at 103 Park Ave., New York 17, N.Y. CHEM- ETCHED CIRCUITS, INC., 121 S. company has consummated new contracts in Cowen St., Garrett, Indiana, has been the amount of $5,900,000 for its industrial formed to develop and manufacture etched and defense products division. SPERRY GYROSCOPE CO., Great Neck, circuits by the photoengraving method. N.Y., was recipient of an order for 21(25 klystron tubes, totaling more than $200,000, placed with them by the U.S. Army Signal MAGNETICS, INC., Box 230T, Butler, Pa. Corps. CINCH MANUFACTURING CORP. of 1026 is now offering molybdenum permalloy pow- So. Homan Ave., Chicago, El. have an- der cores. graded according to inductance nounced the purchase of Graphik Circuits, and color -coded to facilitate assembly. TELREX, INC., Asbury Park, N.J., re- located at 221 S. Arroyo Blvd., Pasadena, Color-coding allows the proper numbers of cently signed two patent license agreements Calif. The addition of this plant enlarges the turns to be put on individual cores without involving their conical antennas. The agree- Cinch coverage of the electronic industry to ments were signed with C -O MFG. CO., include today s most talked of phase, printed special testing. Brockton, Mass., and LA POINTE ELEC- circuits. TRONIC, INC. of Rockville, Conn. MAGNETIC TAPE STORY and its contri- butions to the growth of radio industry are TEXAS INSTRUMENTS, INC., 6000 Lem - DU MONT closed -circuit television was told in new book "Brand of the Tartan." mon Ave., Dallas 9, Texas, is planning to recently used as an aid in welding opera- 250 -page volume traces history of Minne- open a Los Angeles sales office as the first tions at a demonstration at the American sota Mining and Manufacturing Co. Pub- step in establishing marketing headquarters Welding Society & Allied Industry Exposi- lished by Appleton -Century Crofts Inc. throughout the U.S. The Los Angeles office tion in Kansas City, Mo. The Du Mont at will be headquarters for the Western district cameras televised closeup views of latest $3.50. and will be the first of several to be opened types of welding techniques and relayed this year. them by cable to television viewing screens. NEW HAMPSHIRE BALL BEARINGS, INC., Peterborough, N. H., has announced MMES VIBRAPOWER CO. is currently plans for the construction of a new 40,000 constructing a new one -story factory build- EATON ASSOCIATES, INC. of Moodus, sq. ft. plant for bearing manufacture. It ing which will triple the present Chicago Conn., is already in production as a newly will be erected on a twenty -seven acre site manufacturing space they now occupy. The organized company for the manufacture of south of the business section at an estimated new plant will be located at 4060 No. Rock- printed circuit asemblies. cost of $350.000. well St. in Chicago.

VIBRO- CERAMICS CORP., an affiliate of ELECTRO DATA CORP., computer affiliate NORDEN -KETAY CORP. and SCIEN- GULTON INDUSTRIES, INC., Metuchen, of CONSOLIDATED ENGINEERING CORP. TIFIC SPECIALTIES CORP. recently N.J., has inaugurated a comprehensive con- of Pasadena, has established a Southwestern reached an agreement for the acquisition of sulting service in all phases of ultrasonics Regional sales and service facility located at all of the stock of Scientific Specialties for industrial and scientific programs of any 4515 Prentice St., Dallas, Texas. Corp. of Boston, Mass. by the Norden -Ketay scope. Corp. Scientific Specialties is engaged in the design, development, and manufacture of EMERSON RADIO AND PHONOGRAPH precision laboratory and testing instruments WESTINGHOUSE RESEARCH LABORA- CORP., New York 19. N.Y., has organized the used in the medical field and by electronic TORY, Pittsburgh 30, Pa., scientists have Emerson Associate Management Committee and precision laboratories. developed a new insulating enamel for cop- in a move designed to strengthen and per wire. Tests on electric motors insulated broaden the base of executive operations by with the new enamel show that the motors discovering and developing executive talent can operate continuously for 10 years at a within the company. NORTHERN ENGINEERING LABORA- temperature of 325 degrees F. without dam- TORIES, 434 Wilmot Ave., Barlington, Wisc., age to the insulation. has recently been formed in Burlington, Wisc. to manufacture quartz crystals, spe- ETHYL CORP. of Detroit has given per- cializing in glass. sealed. low frequency and WHEELCO DIVISION'S Chicago office will manent protection to their 850,000 research high precision types. The company was or- soon move into new and expanded facilities records, and have condensed these vital ganized by John D. Holntbeck, formerly to be located at 6610 No. Sheridan Road, documents into one filing cabinet through Chief -Engineer at James Knights; Ernest E. Chicago 26, III. This was announced re- microfilming. The entire operation is de- Overbey, formerly Production Engineer at cently by R. A. Schoenfeld, sales manager scribed in a 2 -page folder released by Knights and Robert F. Holzrichter. formerly of the Wheelco Instruments Div., Barber - REMINGTON -RAND, INC. Operations Manager at Knights. Colman Co.

TELE -TECH 8 ELECTRONIC INn11STRICS A,,n,,s* I05Swww.americanradiohistory.com IS Sethteut&'icwt Get advance information... in graphic form... on vacuum -tube behavior in new circuitry with the Type 570 Characteristic -Curve Tracer

The Tektronix Type 570 Characteristic -Curve Tracer can save you many hours in circuit -development work by providing quick, accurate pictures of vacuum -tube characteristics. You have complete control of the operating- condition setup, permitting a realistic approach to actual circuit conditions, whatever they may be. You get curves that can be very important in a particular circuit problem; but are rarely, if ever, published in handbooks. The Type 570 can also be used for rapid preselection of vacuum tubes, either by comparison with another vacuum tube, or with curves outlined on a crt mask.

Please call your Tektronix Field Engineer or Representative or write direct for new booklet, Type 570 Technical Description.

Displays Famines of Curves Calibrated Controls on CRT Screen Accurate current and voltage read- Choice of four to twelve character- ings directly from the crt screen. istic curves per family -with as many Range as 8 positive -bias curves per family. Wide Display n current ronges from 0.02 ma /div Plots All Important to 50 ma /div. Characteristics 9 voltage ranges from 0:1 v /div Plate current against plate voltage. to 50 v /div. Plate current against grid voltage. Fig. 1 - Plate current plotted against Fig. 2 -Same triode section of 12AÚ7 plate voltage for one triode section of a with only 20-v peak plate supply and sen- 11 series -load resistors from 300 ohms Screen current against plate voltage. 12AÚ7. Plate load is 5 k, peak plate - sitivities increased to 0.2 ma /div vertical to 1 megohm. supply voltage is is Screen current against grid voltage. 500 v. Grid voltage and 2 v /div horizontal. Grid voltage is changed 5 v between curves, from -35 v. changed 2 v between curves, from -14 v Grid current against plate voltage. 7 grid -step values from 0.1 v /step to zero. Vertical sensitivity is 5 mo /div, to zero. This is essentially a 25 -times horizontal v Grid current against grid voltage. to 10 v /step. sensitivity 50 /div. Calibrated magnification of the lower left portion of controls permit accurate current and volt- Fig. 1, showing the operating character- age readings directly from the screen. istics at low plate- supply voltage. Price - $925 f.o.b. Portland (Beaverton), Oregon 11 See and try the Type 570 at WESCON, Booths 915 and MOM= 916, and at the !SA SHOW, Booths B461 and B462. \\

Fig. 3 - Screen current plotted agotnst Fig. 4- Typical Germanium Diode curve. plate voltage with positive grid bias on Inherent flexibility of the Type 570 per- Inc. o 6A05. Plate load is 300 ohms, peak mits accurate evaluation of diode charac- Tektronix, plate voltage is 100 v, screen -grid volt- teristics and detailed examination of any P. O. Box 831, Portland 7, Oregon age is 100 v, with grid voltage changing part of the curve. Calibrated scales above 2 v /step from +16 v to below zero. are 0.2 v /div horizontal, 0.5 me /div Vertical scale is 10 ma /div, horizontal vertical, with zero points at center of CYpress 2 -261 1 Cable: TEKTRONIX scale 10 v /div.

26 For product information, use inquiry cord on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com TRUSTWORTHY AVIATION TRANSMISSION For Every HF VHF UHF Application

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CALL ON FEDERAL... for cable made to your specifications. Federal engineers will help you with design problems... 2 RADAR, PULSE, CALL NUtley -3600 EXPERIMENTAL EQUIP- MENT AND SPECIAL TYPES Manufacturer of America's most complete fine of solid dielectric cables Federal Telephone and Radio Company

A Division of INTERNATIONAL TELEPHONE AND TELEGRAPH CORPORATION COMPONENTS DIVISION 100 KINGSLAND ROAD CLIFTON, N. J. In Canada: Standard Telephones and Cables Mfg. Cc. (Canada) Ltd., Montreal, P. Q. Export Distributors: Internotional Standard Electric Corp., 67 Broad St., New York

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 27 www.americanradiohistory.com for FAST FILM PROCESSING with quality results

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There's a Houston Fearless film processor to fit every need: 16mm, 35mm black and white, color, negative, positive, reversal or negative -positive color film ... from the smallest, most compact unit to the largest installation. What- ever your needs, be sure to contact Houston Fearless first!

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48 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com ,.= , a ) 1= If ( another AlSiMag Extra ) Redesign Service for more ECONOMICAL CERAMICS

Our Sample Order Depart- Careful study of designs by our engineering staff (with more ment can quickly make up than 50 years of specialized experience) often results in pieces to any new design recommendations which mean - Savings in manufacturing that looks promising and let costs, Savings in speed and ease of assembly, Savings you test them thoroughly. When the final design has through improved performance, Savings from combining been decided upon, parts two or more parts for still greater economy. can be produced to specification in volume to match your requirements. 5 4 T H Y E A R O F C E R A M I C L E A D E R S H I P AMERICAN LAVA CORPORATION A blueprint or sample of your A SUBSIDIARY OF MINNESOTA MINING AND MANUFACTURING COMPANY present part with outline of op- CHATTANOOGA 5, TENNESSEE Branch offices in these cities (see your local telephone directory): Cambridge, Mass. Chicago, III. erating requirements will bring Cleveland, Ohio Dallas- Houston, Texas Indianapolis, Ind. Los Angeles, Calif. Newark, N. J. Philadelphia -Pittsburgh, Pa. St. louis, Mo. South San Francisco, Calif. Syracuse, N. Y, action . . . which may prompt Tulsa, Okla. Canada: Irvington Varnish & Insulator Div. Minnesota Mining & Mfg. of Canada, save you lots of money. Ltd., 1390 Burlington Street East, Hamilton Ontario, Phone Liberty 4.5735. ALL OTHER EXPORT: Minnesota Mining & Manufacturing Co., International Division, 99 Park Avenue, New York, N. Y.

www.americanradiohistory.com New Tech Data for Engineers Resumes of New Catalogs and Bulletins Offered This Month by Manufacturers to Interested Readers

Turret Punch Press Induction Motor Digital Pressure Gauges Bulletin No. 61, a 15 -page booklet, presents Design data sheet released by Dalmotor Bulletin BJE -606 describes the miniature the construction details, operation features. Co., 1373 Clay St., Santa Clara, Calif. de- digital pressure gauges developed by the and time -saving principles of the R -61 turret scribes the Type AC -93 miniature, subfrac- Byron Jackson Co., Electronic Division, 2010 punch press made by the Wiedemann Ma- tional. 400 cps induction motor. Illustrates Lincoln Ave., Pasadena 3, Calif. Gives spec- chine Co., 4272 Wissahickon Ave.. P.O. Box the unit, gives detailed and dimensional out- ifications for "Vibrotron" model gauges and 6794, Philadelphia 32, Pa. Gives performance lines, and technical specifications. (Ask for lists other electronic testing and control in- specifications. (Ask for B -8 -1) B -8 -18) struments. (Ask for B -8 -30) Curve Tracer Transducers "A Procedure for Transducer Evalua- Printed Circuit Connectors A 7 -page brochure, issued by Tektronix, tion," Bulletin KCE -491, is available from Inc., Sunset Highway and Barnes Road, P.O. Crescent Engineering and Research Co., Bulletin SR -DX2. issued by Cannon Pro- Box 831, Portland 7, Ore., gives a technical Electronics Div., 11632 McBean St., El motion Dept., 3207 Humboldt St., Los An- description of the Type 570 characteristic- Monte, Calif. (Ask for B -8 -19) geles 31, Calif., contains complete informa- curve tracer. Illustrates the unit and its tion on five new "Cannon" connectors curve displays; gives specifications and mod- ranging through 10, 18, 22, 28 to 44 contacts. ifications notes. (Ask for B -8 -2) Motors (Ask for B -8 -31) A 14 -page booklet issued by El Ray Co., Paper Capacitor Inc., 1747 Vose St., North Hollywood, Calif., gives characteristics and performance data Detector Cells A 4 -page brochure, released by Astron on their line of fractional horsepower Corp., 255 Grant Ave., E. Newark. N.J. pre- motors in permanent -magnet, field wound, A 4 -page illustrated brochure covers the sents the "Comet." Type MBP, molded -plas- and induction types. (Ask for B -8 -20) "Servotherm" thermistor heat detector cells tic, tubular, metallized-paper capacitor with produced by Servo Corp. of America, 2020 performance characteristics, test specifica- Jericho Turnpike, New Hyde Park, N. Y. tions, and price list. (Ask for B -8 -3) Electronic Equipment One. A1317, is a low -price commercial Four technical literature releases issued model. Model 1E1312 is a laboratory unit, Power Supplies by Consolidated Engineering Corp.. 300 N. and }1340 is for use where high ambient Sierra Madre Villa. Pasadena 15, Calif., pre- vibrations are present. (Ask for B -8 -32) Bulletin RMPS -854, "Radar & Missile sent the following electronic eauipments: Power Supplies," illustrates and describes Bulletin 1402D presents the amplifier system low -voltage. high -current, tubeless, mag- D. Explains the system, gives operational Data Printers netic- amplifier- regulated types of power principles, component specifications and supplies for ground and airborne missile and prices. Bulletin 1537C illustrates and de- Two new folders describe specifications radar applications made by Perkin Engineer- scribes the Type 23 -109 oscillograoh pro- and applications of two Clary Numerical ing Corp., 345 Kansas St., El Segundo, Calif. cessor. and gives technical data and prices. Data Printers. Folders list six models of (Ask for B -8 -4) Bulletin CEC -1517 C illustrates and describes Parallel Entry and four models of Serial the coupling system "B" class, comprising Entry Printers. Electronic Div., Clary Corp., the Type 8 -201 matching network and Type San Gabriel, Calif. (Ask for B -8 -33) Motor- Gear -Train 7 -353 integrating galvanometers. Bulletin CEC -1556 covers the Type 4 -315 pressure A new catalog sheet issued by John Oster pickup. (Ask for B -8 -21) Manufacturing Co., 1 Main St., Racine. Wis., Breadboards gives technical data, including dimensional drawings, performance features, and a table Microwave Equipment Four page catalog describes a flexible of motor and gear train lengths with re- A series of data sheets released by Cas- breadboard chassis system based on plate - lated data. (Ask for B -8 -5) cade Research Corp., 53 Victory Lane, Los modules. U. M. & F. Mfg. Corp.. 10929 Van- Gatos, Calif., illustrate and give dimensions owen St., N. Hollywood, Calif. (Ask for RF Connectors and performance data covering the power, B -8 -34) ruggedized. and standard "Uniline" isolators. A new D3 catalog devoted entirely to the "Gyraline" variable attenuators, and radio frequency connectors has been re- other ferrite microwave equipment made by Testing Facilities leased by American Phenolic Corp., 1830 the company. (Ask for B -8 -22) South 54th Ave., Chicago 50, Ill. The 64- Four -page brochure outlines the environ- page catalog contains the following r -f con- Panel Instruments mental and type- testing facilities and serv- nector series. N, BN. C, LC, UHF, BNC, HN, ices offered by American Electronic Lab- between series adapters, coaxial cable A data sheet issued by Phaostron Co., 151 oratories, Inc, 641 Arch St., Phila. 6, Pa. fittings, push -on and "Subminax." Dimen- Pasenda Ave., Pasadena, Calif., presents (Ask for B -8 -35) sions, mounting holes, weights, impedance, mounting dimensions and technical data materials, and matching cable types are covering the company's metal -cased 414 in. given for each connector. (Ask for B -8 -6) custom panel instruments. (Ask for B -8 -23) Spectrum Analyzer Channel Recorder AN Electrical Connectors Type LA -17 Spectrum Analyzer, with a calibrated range from 10 to 16,000 mc and Bulletin 327, and attached statement of A bulletin describing the complete line of usable range from 3 to 34,000 mc, is de- recent improvements and changes, illustrates AN electrical connectors manufactured by scribed in a 2 -page folder from Lavoie and describes the 200 -channel, automatic the Deutsch Co., 7000 Avalon Blvd., Los Laboratories, Inc., Morganville, N. J. (Ask strain gauge recorder made by Beckman Angeles. Calif. is available to users in the for B -8 -36) Instruments, Inc., Fullerton, Calif. Presents electronic and allied industries. Describes the instruments operation and applications. application fields and performance require- (Ask for B -8 -7) ments, sizes and capacities, basic parts, and numbering system. (Ask for B -8 -24) Microwave System Electron Tubes Bulletin 3 -206. released by the Equipment Metals and Marketing Div., Raytheon Manufactur- A 24 -page booklet on the Advisory Group A booklet released by Metal Control Lab- ing Co.. Waltham, Mass., describes the on Electron Tubes can be obtained on re- oratories, Inc.. chemical and metallurgical Model TCR -12 "Telelink," an automatic, quest to the New York University, Advisory engineers, 2735 East Slauson Ave., Hunting- two -way telephone, telegraph, 'Teletype" Group on Electron Tubes. 346 Broadway, ton Park. Calif., describes the ferrous and and telemetering microwave communica- New York 13, N. Y. The booklet describes non -ferrous chemical analyses, quantometric tions system operating in the common car- the purpose, organization, membership, op- analyses, physical tests, and metallurgical rier or industrial bands. (Ask for B -8 -11) eration, and history of the group, an agency tests the organization is staffed and equipped of the Assistant Secretary of Defense for to make. (Ask for B -8 -25) Research and Development. (Ask for B -8 -8) Analyzer Diplexer Material Impregnators A brochure released by DIT -MCO Inc., Bulletin 2550 describes the "Red Point" 505 W. 9th St., Kansas City 6, Mo., describes Bulletin No. 429. announced by Prodelin dual impregnators, made by Red Point Prod- the Model 200 universal automatic electrical Inc., 307 Bergen Ave., Kearney. N. J. con- ucts. Inc., 1907 Riverside Drive, Glendale 1, circuit analyzer. Presents several models of tains application features, and electrical and Calif. Gives detailed description, drawing. the analyzer with applicable specifications mechanical specifications covering the Type parts and terminology. Tells how the unit and gives an example of various circuits DNTV -25 single line VHF high -band notch simplifies deep impregnation of porous and components with which the analyzer is diplexer (Ask for B -8 -9) articles and laminates under vacuum. (Ask used in different tests. (Ask for B -8 -12) for B -8 -26) Lighting Arrangements "Rotoroids" Technical information and prices covering Magnetic Amplifiers the "C- lector" remote, preset, lighting ar- Bulletin MA, released by Hycor Company, Burnell & Company, Inc., Yonkers 2, rangements control is available at Century Inc.. 11423 Vanowen St., North Hollywood, N. Y., (Pacific Division, 720 Mission St., Lighting, Inc., 531 W. 43rd St., New York. Calif., describes the company's standard type South Pasadena, Calif.) has revisions for N. Y.. and 1820 -40 Berkeley St., Santa Mon- magnetic amplifiers of toroidal construction. pages 3 and 4 of the recently released "Ro- ica, Calif. The new brochure describes the Also gives information regarding special de- toroid" technical data sheet. Gives values unit's operation and hookup method. (Ask signs for individual requirements. (Ask for for mass and shaft torque for standard units for B -8 -10) B -8 -27) and other data. (Ask for B -8 -13)

30 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com the finest TUa,mC s in ELECTRONICS are on the road!

Hp/ ((IiI/if (I/ WESCON! August 24 -26 NEELTSan Fra?zcisco, ENTERPRISES

and the 11 STARS OF THE SHOW! 1111T BOONTON RADIO CORP. Booths 913414 NEELY ENTERPRISES LtechonKManufaoturers Representatives ELECTRO- MEASUREMENTS, INC. Booth 817 LOS ANGELES OFFICE GERTSCH PRODUCTS, INC. Booths 1014-10'5 3939 Lonkershim Boulevard HEWLETT -PACKARD COMPANY.. .Booths 1012.1013 ¡North Hollywood, Cali1.1 SAN FRANCISCO OFFICE KAY LAB . Booths 1009 -1010 7830 Geary Boulevard LIBRASCOPE, INC. Booths 911 -912 SACRAMENTO OFFICE SANBORN COMPANY Booth 1008 1317 15th Street SENSITIVE RESEARCH INSTRUMENT CORP Booth 1016 SAN oJEGO OFEICF 1079 Rosecrons SIreer SIERRA ELECTRONIC CORP.. Booth 1114 -SRUOUEROUE OFFICE TEKTRONIX, INC. Booths 915 -916 107 Wo.h ngIon. S.E VARIAN ASSOCIATES Booths 918 -919 fOENJ; OFFICI NEELY HEADQUARTERS 44f F .A.ssoun Avrnu. Booths 917.1011

www.americanradiohistory.com Coming Events A listing of meetings, conferences, shows, etc., occurring during the period Aug. 1955 through Oct. 1956 that are of special interest to electronic engineers

Aug. 15 -19 -AIEE Pacific General Sept. 27 -Oct. 1- Int'l. Analog Com- Nov. 14- 16- IRE /AIEE /ASA Electronic Meeting, Butte, Montana. putation Meeting, Brussels, Belgium. Techniques in Biology and Medicine, Shoreham Hotel, Wash., D.C. Aug. 22- 23- Symposium on Electronics Sept. 28- 29- Industrial Electronics Con- in Automatic Production, sponsored ference, sponsored by the ALEE and Nov. 14 -17- Second International Auto- by Stanford Research Institute and IRE, Detroit Rackam Memorial Audi- mation Exposition, Chicago Navy the National Industrial Conference torium, Detroit, Michigan. Pier, Chicago, Illinois. Board, Sheraton Palace, San Fran- cisco, Calif. 30 2 Fidelity Show, Sept. -Oct -High Dec. 10- 16- International Atomic Ex- Palmer House, Chicago, Ill. Aug. 23 -Sept. 3- British National Radio position, Cleveland Public Auditor- ium, Cleveland, Ohio. Show, Earls Court, London, England. Sept. 30 -Oct. 2- International Sight and Aug. 24- 26- WESCON Western Elec- Sound Exposition, Inc., Palmer House, Chicago. Dec. 12 -16- Nuclear Science and Engi- tronic Show & Convention, San Fran- neering Congress, sponsored by the cisco Civic Auditiorium, San Fran- Oct. 3- 5-National Electronics Con- Engineers Joint Council, Cleveland, cisco, Calif. ference, Hotel Sherman, Chicago, Ohio. August 26 -28- Sixteenth Annual Sum- Illinois. mer Seminar, sponsored by the Em- Jan. 9 -10, 1956-Second National Sym- porium Section of the IRE, Emporium, Oct. 3 -7-AIEE Fall General Meeting, posium on Reliability and Quality Pa. Morrison Hotel, Chicago, Illinois. Control in Electronics, sponsored by the Professional Group on Reliability Aug. 26 -Sept. 4 -German Radio, Tele- Oct. 3 -7 -78th Semi -annual Convention and Quality Control of the IRE, co- vision, Gramophone and Radiogram of the SMPTE, Lake Placid, New sponsored by the American Society Exhibition, Dusseldorf, Germany. York, N.Y. for Quality Control and the RETMA.

Sept. 6- 17- Production Engineering Oct. 11 -13 -AIEE Aircraft Electronic Show and Machine Tool Show, Navy Jan. 19 -21, 1956 -National Simulation Equipment Conference, Los Angeles, Conference, sponsored by the Dallas - Pier and International Amphitheatre, California. Chicago, Ill. Fort Worth Chapter of the IRE Pro- fessional Group on Electronic Com- 12 the Audio Oct. -15- Convention of (PGEC), Dallas, Texas. Sept. 12 -16 -10th Annual Conference Engineering Society, Hotel New puters and Exhibit, sponsored by ISA, Yorker, N. Y. Shrine Exposition Hall and Audi- Jan. 30 -Feb. 3, 1956 -AIEE Winter Hotel, New torium, Los Angeles, Calif. Oct. 17 -19 -RETMA Radio Fall Meet- General Meeting, Statler N. Y. York, N.Y. Sept. 14- 16-ACM General Meeting, ing, Hotel Syracuse, Syracuse, Moore School of Electrical Eng., Univ. Feb. 2 -3, 1956- Symposium on Micro- of Pennsylvania, Phila., Pa. Oct. 21-23-New England Hi -Fi Show, Hotel Touraine, Boston, Mass. wave Theory and Techniques, Univ. Sept. 14- 16-The Second National An- of Pennsylvania, Phila., Pa. nual Meeting of the IRE Professional Oct. 24- 25- Annual Technical Meeting Group on Nuclear Science (PGNS), sponsored by the IRE Professional April 15 -19, 1956 -The 34th annual Oak Ridge, Tenn. Group on Electron Devices, Washing- convention of the National Associa- ton, D. C. tion of Radio and Television Broad- Sept. 17- Symposium on Automation, casters, Conrad Hilton Hotel, Chi- sponsored by the Cedar Rapids sec- October 24 -26 -Sixth National Con- cago, Ill. tion of the IRE, Cedar Rapids, Iowa. ference on Standards, sponsored by Sept. 20 -22 -10th Anniversary Indus- the American Standards Association April 17 -19, 1956- Fourth National Con- trial Packaging and Materials Han- and the National Bureau of ference on Electromagnetic Relays. dling Show, Kingsbridge Armory, Standards, Sheraton Park Hotel, Washington, D. C. New York, N. Y. May 14 -16, 1956-National Aeronautical and Navigational Electronics Confer- Sept. 23- 24- Annual BTS Meeting, Oct. 31- November 4 -East Coast Con- ence, Dayton, Ohio. sponsored by IRE, Hamilton Hotel, ference on Aeronautical and Naviga- Wash., D.C. tional Electronics, Baltimore, Md. Aug. 15 -17, 1956- IRE /AIEE /IAS /ISA National Telemetering Conference, Sept. 26- 27-6th Annual Meeting and 4 on Oct. 31 -Nov. -World Symposium Angeles, Calif. Conference of the IRE Professional Applied Solar Energy, conducted un- Statler Hotel, Los Group on Vehicular Communications, der leadership of Stanford Research Multnomah Hotel, Portland, Ore. Institute, Phoenix, Arizona. Aug. 21 -25, 1956 -WESCON Sept. 26 -27 -RETMA Symposium on Nov. 3 -4-The Eighth Annual Elec- Oct. 1 -3, 1956 -National Electronics Automation, University of Pa., Phila- tronics Conference, sponsored by the Conference. delphia, Pa. Kansas City section of the IRE, the Town House, Kansas City, Kansas. Sept. 26 -28-Prof. Gp. on Communi- Oct. 15 -17, 1956 -IRE /RETMA Fall IRE, Symposium, Meeting, Hotel Syracuse, Syracuse, cations Systems, Computer Utica, N. Y. Nov. 7-9--Eastern Joint New York. Conference and Exhibition, spon- Sept. 26- 30-The First Trade Fair of the sored by the AIEE, the IRE, and the Association for Computing Ma- MORE NEWS Atomic Industry, Sheraton -Park 34 Hotel, Washington, D. C. chinery, Hotel Statler, Boston, Mass. on page

INDUSTRIES August 1955 32 TELE -TECH & ELECTRONIC www.americanradiohistory.com advance -designed yesterday . -m industry -wide use today!

AMP IFIERS REGULATORS INERT GAS AND MERCURY RECTIFIERS MERCURY, INER GAS AND HYDROGEN THYRATRONS

3B28 RECTIFIER Rugged half -wave Xenon filled rectifier. Operates in any posi- CHATHAM tion. Ambient temperature range -75° to +90 °C. In- verse peak anode voltage SPECIAL-PURPOSE 10,000, average current .25 amps. Filament 2.5v., 5 amp.

4B32 RECTIFIER Ruggedly built, half -wave TUBES Xenon filled rectifier. Ambient temperature range -75° to +90 °C. Inverse peak anode voltage 10,000, average anode current 1.25 amp. Filament 5v., 7.5 amp. eVC -1258 MINIATURE HYDROGEN THYRATRON for pulse generation. Handles 10 kw peak pulse power. !6336 TWIN TRIODE for voltage regulation. Features high plate dissipation, hard 5R4WGB I! VC-1258 5651 -WA glass envelope.

5R4WGB RECTIFIER Full wave rectifier manufactured STANDARD TYPES DIRECT FROM STOCK to MIL -E -1B reliable tube specifications. PLUS SPECIAL DESIGNS BUILT TO REQUIREMENTS X5651 -WA VOLTAGE Chatham specializes in the development of general and REFERENCE TUBE special purpose tubes for both electronic and industrial Stable, rugged. Available in both commercial or reliable applications. Many of the tubes originally developed by tube MIL types. Chatham to fill a specialized need, now number among the most widely used tubes in the industry. For complete information on Chatham tubes - either stock items or types built to your requirements - call or write today. CHATHAM ELECTRONICS CORP. Executive and General Offices: LIVINGSTON, NEW JERSEY Plants and Laboratories: NEWARK and LIVINGSTON, NEW JERSEY

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 33 www.americanradiohistory.com TEL The `Micro -Gap"

MAGNETIC RECORDING HEAD

-so versatile it can be used for THE RUGGED INDIVIDUAL who specialized precision applications, hates to work with others has no as well as in professional and semi- place as an electronic engineer, pointed out Dr. Mervin J. Kelly, professional tape recorders. Bell Labs' president, recently in a magazine article, "Should Your Child Be An Electronic Engineer ?" More and more, Dr. Kelly said, electronic engineering has become dependent This new, versatile, high output magnetic on teamwork. He added For all types of data that the following characteristics recording head offers you these important gathering and recording should be looked for in equipment which youths choos- advantages- require ing the science field: a scientific the use of a precision - Excellent response over an extremely quality recording head. bent, a liking for math and physics, wide frequency range. a fascination for experiments and a painstaking, intelligent, honest and Product uniformity. Advanced Statis- Magnetic Recording open mind. tical Quality Control techniques assure strict adherence to close mechanical Dictating Equipment and electrical tolerances. Your design ELECTRONIC DICTIONARIES and production problems are consid- Pulse Width Recording which turn months of problem prep- erably reduced. Strain gauges aration time into a matter of minutes Pressure gauges have been developed for Reming- Convenient, versatile mounting. The ton Rand's Univac system. Actually Velocity indicators "Micro -Gap" is available as a base - an automatic programming system, mounted (Model TR30) or as a back - the new development is claimed to mounted (Model TR35) unit. Direct Recording do away with the tedious and time - Noise analyses consuming work of coding, writing Ease of adjustment for proper gap Vibration analyses and checking programs of instruc- alignment and angularity. Track and tion for electronic computers. gap location procedures are greatly simplified. FM Recording Small size. The "Micro -Gap" measures Transient Phenomena NEW GUNFIRE CONTROL equip- only 45/64" from face to the mounting Analog data ment manufactured by Daystrom Inc. for the U.S.S. New Jersey shoulder. From top to it is Vibration- strain- stress bottom weighs 11 tons, incorporates more 31/64"; from side to side it is 21/32 ". than 32,000 parts and require more The "Micro -Gap" is ideal for minia- Direct Pulse Recording than 18,000 electrical connections. turization applications -it is one of the Computers Navy sees it as the answer to track- smallest commercially -available mag- Precision Systems ing high speed jets. netic recording heads on the market.

The "Micro -Gap" is embedded in a stable ENGINEERS AUTOMATIC WAREHOUSING synthetic resin, and is shielded in a seamless. Excellent employment op- system that operates by means of drawn mu -metal case. It is highly resistant portunities available for electronic controls is being demon- to extremes of temperature and humidity. men having Research and strated at the Colmar, Pa. plant of Development ability in Link -Belt Co. In response to signals Write now for complete specifications on Magnetic Recording, from punched cards, the carriers of the "Micro -Gap" magnetic recording head. M icrophones, Transducers, an overhead trolley conveyor are Shure research and development engineers Phonograph Reproducers. tripped to discharge packages to any can assist you with your specific Write Chief Engineer, magnetic Shure Brothers, Inc. number of chutes in which are ac- recording problems. cumulated orders for various customers.

A BILLION OPERATIONS without maintenance is the claim for the new mercury -wetted contact relays being SHURE BROTHERS, INC manufactured by C. P. Clare Co. for 225 W. HURON STREET CHICAGO 10, ILLINOIS use in high -speed switching devices. (Continued on page 40)

34 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Johnsonburg, Pa.

Administration Building St. Marys, Pa.

Canadian Stackpole Toronto

S T A C K P O L E

Plant No. 1 r-tit '.L T MT- Kane, Pa.

Plant No. 2 Kane, Pa.

s _ N 1 . -/ ¡. ."- , =-7.4,=-7.4,X"" - r. s.. 7 Main plant r1 ..s.,y ./' St. Marys, Pa. -.> b t ; 4 ra, d peg'-.E-rt . .! 7 . ñ '. , i-. m l : `y. F

Plant No. 2 1r0(10 t4rll!f%N,/ St. Marys, Pa. VJ. )< :Jr1 .THIS IS

A good source for dependabl electric -electronic components

FIXED AND VARIABLE RESISTORS IRON CORES CERAMAG' FERROMAGNETIC CORES LOW VALUE COMPOSITION CAPACITORS SLIDE AND LINE SWITCHES CERATAB® PRINTED COMPONENTS MOLDED COIL FORMS CERAMAGNET® PERMANENT MAGNETS BRUSHES FOR ALL ROTATING ELECTRICAL EQUIPMENT ELECTRICAL CONTACTS POWER TUBE ANODES ... and dozens of carbon, graphite and metal powder specialties Electronic Components Division, STACKPOLE CARBON CO., St. Marys, Pa.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on lost page. 35 www.americanradiohistory.com You can depend on BUSS fuses to operate properly under all service conditions. This means that BUSS fuses will open and prevent further damage to your customers' equipment when there is trouble on If you want the circuit. And just as important, BUSS fuses won't blow when trouble doesn't exist. Users are not annoyed with "Trouble- Free" useless shutdowns caused by needless blows. To make sure of this "trouble- free" operation - every BUSS fuse normally used by the Electronic In- fuses in all dustries is tested in a sensitive electronic device. Any fuse not correctly calibrated, properly constructed and right in all physical dimensions is automatically re- sizes and jected. A complete line of fuses is available. Made in dual -element (slow blowing), renewable and one time types types ... in sizes from 1 /500 ampere up - plus a companion line of fuse clips, blocks and holders. TURN When it's a fuse you need - think first of BUSS. You will be protecting both the product and your good name against troubles and complaints often suss: caused by use of poor quality fuses. to BUSS FUSE - For more information on and TRON small dimension fuses and fuseholders .. . Write for bulletin SFB.

855 Makers of a complete line of fuses for home, farm, commercial, TRUSTWORTHY NAMES IN Div . McGraw Electric electronic, automotive and ELECTRICAL PROTECT/OY1 Co. industrial we. Unlvrslty at Jfforson St. Louts 7, Mo.

For product information, use inquiry 36 card on last page. TELE -TECH $ ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com for economy... for quality... specify...

. .:C L.O S E TO_

NIATURE CAPACITORS EFCON Polystyrene Miniature Capacitors have become in two brief years the standard for the electronics industry ... wherever close tolerances are important. They have proven exceedingly successful for filters, timing circuits, precision instruments, analog and digital computors ... plus many other applications. EFCON Close Tolerance Polystyrene Capacitors are mass produced in two styles: Type PC has a rigid cardboard tube construction:. Type PH is hermetically sealed in a metal case with glass -to- metal, solder -sealed terminals. Both types feature non- inductive extended foil construction with leads soldered directly to the foil ... assuring minimum contact resistance. Thanks to advanced engineering and special production techniques ... EFCON Polystyrene Capacitors are consistently made to tolerances ± closer than 1 %. They are available in a range of standard capacitance values from .001 to 2 Mfd. Non -standard values are made to customers' specifications. where close tolerance is standard tolerance PERFORMANCE DATA

EFCON Close Tolerance Polystyrene Capacitors provide excellent stability over an OTHER EFCON CAPACITORS extended temperature range ... along with an extremely high insulation resistance (1012 Type TH "Teflon "* Film Capacitors ... for high ohms at 25 °C). They have a negative temperature applications. Hermetically sealed. temperature coefficient of less than - 100 Type MH "Mylar "* Film Capacitors ... hermetically PPM/ °C). In addition to a very low dielectric sealed in metal cases and mass produced with absorption ... EFCON Polystyrene Capacitors tolerances of ±5 %, ±2 %and ±1 %. feature the lowest dissipation factor of any film capacitor. They are tested at a DC voltage Type MC "Mylar "* Film Capacitors ... made with of at least 250% of rated voltage at 25 °C. wax impregnated cardboard tubes. Type S Molded Silver Mica Capacitors.

DuPont Trademark Write Dept. G (or technical data which includes new charts describing average temperature characteristics .. . for capacitance ... power factor .... insulation resistance. ELECTRONIC FABRICATORS, INC. 682 Broadway, New York 12, New York

TELE -TECH & ELECTRONIC INDUSTRIES For product Auaust 1955www.americanradiohistory.com information. use inauiry cord on lost nace. n7 COLOR BAR GENERATOR - MODEL PT -203 A complete instrument with a color bar pulse forming unit, a complete colorplexer unit and'regulated B+ and filament supplies. Provides NTSC color TV test signals, for receivers, transmitters, networks and components. Internal switching provides 19 different test patterns in the form of a composite NTSC video signal. Special self -balancing colorplexer provides exceptional stability over long periods of operation without readjustment, with "I" and "Q" outputs. (See colorplexer details.) AUTO -SELF- BALANCED COLORPLEXER MODEL PT -205 Incorporated in the Model PT -203 Color Bar Generator, available as a separate chassis for rack mounting. Designed for high stability and negligible drift, this unit replaces old encoder units of early design. This instrument multiplexes three simultaneous color video signals (R, G, BI and properly encodes them into color information and then combines them with sync pulses and color sync signals to form a standard NTSC color POLARA® or video signals to drive colorplexer TV signal. Pulse may be obtained from special (R, G, B) pulse generators, color camera or color slide scanner. Subcarrier balance is stable and dynamically independent of signal level changes over long periods of operation. Driving signals are Subcarrier, Blanking, Sync and Vertical pulses. Full bandwidth "I" and "Q" modulation is used in the chrominance channel of the colorplexer. "I" and "Q" or "B-Y" and "R -Y" video test signals are available for receiver and monitor matrix alignment. Both positive and negative polarity signals are available at high and R low impedance.

AN INTEGRATED LINIE OF EQUIPMENT FOR STUDIO AND LABORATORY

Fully integrated units that combine ease of operation with maximum stability. No additional accessories or power units required for operation. COLOR BAR GENERATOR - COLORPLEXER -MODEL PT -205 MODEL PT -203 Especially designed for: Output Signals: NTSC Output Signals: NTSC Composite Composite Video 2 Outputs 0 v. pk-pk Video 2 Outputs 0 -1.4 v. pk -plc -1.4 Testing receivers, transmitters, and Output Signal Information: Available Test Signals: I, Q, Y, Color Bars -6 Bars of Color (R, G, R -Y, B -Y, (Neg. and Pos.) Video Input Signals: Subcarrier terminal equipment. B, C, Y, M) plus Blk /Wht Gamma Bars -10 step grey scale 20 -30 v. pk -pk, 3.579545 me Black to White Sync. 3.0 v. pk -pk, negative Drive 3.0 v. pk -pk Laboratory test standards for Dots -White dots on a black field Vertical External Video -Positive or negative, R, G, B; 1 v. pk -pk development of color TV equipment. negative (Provision for mixing System Bandwidth: Luminance ext. video with above). Channel 6 me System Bandwidth: Luminance Chrominance: "I" and "Q" Checking components used for color TV. Channel 6 me Channel per NTSC standard Chrominance: "I" and "Q" Subcarrier Balance Stability: Channel per NTSC standard Drift not greater than 6 Alignment and adjustment of colorplexers Subcarrier balance stability: Drift mv (1.4 v. signal), 8 hour not greater than 6 mv (1.4 operation or encoders. v. pkpk signal), 8 hour operation. Power Reqùirements: Residual Subcarrier Unbalance: AC 6.3 v. @ 12 amps., 1% Signal Level DC 280 v. gz 470 ma Testing convergence of tricolor Power Requirements: AC 105-125 kinescopes. volts 7 amps., 60 cps.

ELECTRONICS CORPORATION

Dayton Fort Worth Los Angeles . New York REPRESENTATIVES: Albuquerque Atlanta Baltimore Bayonne . Bridgeport Buffalo Chicago

on page. & ELECTRONIC INDUSTRIES August 1955 no For nrn.lurt information. use inquiry card last www.americanradiohistory.comTELE -TECH SYNCHRONIZING GENERATOR - MODEL PT -201 COLOR SUBCARRIER GENERATOR AND FREQUENCY DIVIDER UNIT Compact unit provides RIMA standard driving, blanking and syn- - MODEL PT -202. This rugged unit complete with regulated B+ chronizing pulses, as well as a composite video signal compris- and filament power provides standard NTSC subcarrier frequency ing vertical and horizontal dots for receiver tests (positive and with dual outputs and includes a frequency divider to provide a negative). Used to drive color bar generators, or any other NTSC color TV generating equipment. Utmost stability assured sync generator driving signal (31.5 KC) to convert standard B/W through use of delay lines and by driving all pulses from leading sync generators for color TV use. High stability achieved by edge of a crystal controlled oscillator. Unit may also be locked temperature controlled crystal oscillator. All adjustments access- to synchronize with 60 cps line. External drive input jack ible at front of unit. Adapts any sync generator to NTSC color permits operation with Color Subcarrier Generator. Complete operation. with power supply. COLOR TV VIDEO MONITOR - MODEL M -200 COLOR SLIDE SCANNER - MODEL PT -210 Two portable units supplied with brackets for standard rack A complete equipment integrated into only two racks which pro- High vides a high resolution NTSC composite color video signal mounting. definition color picture with exceptionally good obtained from standard 2 x 2 (35mm) transparencies. Designed for color rendition is displayed on a 15 inch tri -color kinescope. maximum stability and high signal to noise ratio. The optical Excellent for checking the quality of NTSC color video signals head is with lenses IN -LINE complete employing dichroic mirrors in the studio, on transmission lines or in the receiver factory. and Fresnel condensing lenses. The R, G, B signals obtained from Special test jacks and switches are provided for analyzing R, G, three channel photo amplifiers are gamma corrected to give B matrixing proper rendition to high lights and shading. Utilizes a highly signals, and phase of color signals. Exceptionally stabilized colorplexer. (See complete description of Model PT -205 good synchronizing capabilities over a wide range of signals. Colorplexer above.) Special convergence circuits are employed to give maximum The scanning kinescope has fine resolution and is combined with utilization of color kinescope. Model M200 has good color stabil- the deflection and high voltage unit. The remaining chassis com- ity and is relatively insensitive to line voltage changes. Excellent ponents contain regulated low voltage power units, a regulated dynamic circuit linearity assures good color stability over a wide filament power unit and a regulated photo multiplier power supply. range in signal level.

SYNCHRONIZING GENERATOR - COLOR SLIDE SCANNER - COLOR SUBCARRIER GENERATOR COLOR VIDEO MONITOR -MODEL M -200 MODEL PT -201 AND FREQUENCY DIVIDER MODEL PT -210 Input Video Signal: 0.5 to 2.0 UNIT -MODEL PT -202 Output Signals: Sync. (Neg. Output Signals: NTSC Composite volts, pk -pk and Pos.) 4 v. pk -pk across Video 2 Outputs 0 -1.4 v. pk -pk Subcarrier Frequency Dual Output: Signal Polarity: Pos., Neg., Bal. 75 ohms Optical Head: Lens -F. 2.0 3.579545 me /sec. ± 0.0003% Input Impedance: 66 mmf across Blanking (Neg. and Pos.) 4 v. 50 mm, Xenon lens in tractica with maximum rate of 2.2 megohms or 75 ohms pk -pk across 75 ohms mount frequency change not exceeding Resolution: 250-300 lines min. Horiz. Drive (Neg. and Pos.) IN -LINE dichroic mirrors 1 /10 cps. /sec. (Full NTSC Color 4 v. pk -pk across 75 ohms Color Slide 2 x 2 color Subcarrier Output Voltage: 25 to SignaltBandwidth) Vert. Drive (Neg. and Pos.) 4 v. Transparencies 40 volts Linearity: (Hor. and Vert.) 2% pk -pk across 75 ohms Gamma Amplifier: Frequency Divider Output: across raster Composite Video Output (Neg. Three Channels (R, G, B) 31,468 cps. Tricolor Kinescope: 15" and Pos) 1.4 v. pk -pk across Input Signal -1.4 v. pk -pk Divider Output Voltage: 0 to 100 Focus: Electro Static 75 ohms across 75 ohms volts Net Weight: 175 lbs. Dot Pattern Internal or Output Signal -1.4 v. pk -pk Ambient Temperature: 40° F. to Power Requirements: 105 -125 v., External Video v. pk -pk -1.4 across 75 ohms 110° F. 4 amps., 50/60 cps. across 75 ohms (See Model PT-205 Power Requirements: AC 105-125, Power: Colorplexer: Input 105.125 v. 4.5 above) 2A, 60 cps. amps., 60 cps. Deflection and High Voltage Unit: Kinescope type 5AUP24; Operating Voltage: 27 KV regulated Linearity: 2% across raster Horizontal and Vertical AVAILABLE ON EQUIPMENT LEASE PLAN Photomultiplier Power Supply: Electrically regulated. Filament FIELD MAINTENANCE SERVICE AVAILABLE Supply -AC line Regulated THROUGHOUT THE COUNTRY Input Signals: Hor. Drive -3 v. pkph Ver. Drive -3 v. pk -pk. Blanking Drive -3 v. pk -pk Sync. 3 v. pk -pk Power Requirement: AC 105-125 v., 16 amp., 60 cps.

43 -20 34th STREET, LONG ISLAND CITY 1, N. Y.

Newton Philadelphia San Francisco Syracuse Washington, D. C. Westbury Winston -Salem Canada, Arnprior, Toronto- Export: Rocke International Corporation

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 39 www.americanradiohistory.com TEL E-TIPS rt1 (Continued from page 34)

LEARNING TO LISTEN. A group of ambitious adults in Philadelphia are going back to school to learn how to become better listeners. Listening, according to school director C. L. Scheetz, is the most abused and neglected tool of man - to -man communication. So 100 employees of Minneapolis -Honeywell's Industrial Division are participating in a comprehensive training program which covers all phases of communications: listening, writing, reading and speaking.

THE INTERNATIONAL ORGAN- IZATION FOR STANDARDIZA- TION, at a five -day meeting held recently in Stockholm on Cinema- tography, adopted several proposals to help further international exchange of film products. Safety film definition and methods of testing were agreed upon as well as a U.S. proposal for the and ?" cutting perfor- about portability of us ating of 35mm film for use in Cin- "What questions ?" "Rugged? asked these has all emascope. "powerful entent have LINK and the Engineers we note that pur answeran and evidence, telecast SUPERSONIC VIBRATIONS may times. more. aAs bomb the historic miles; be the answer to a problem which these toc Y of of was used o is atom cli- has intrigued scientists for many LINK to Los Angeles, LAMBDA Nng da, Even with years -how to tap the ocean's sup- Yucca Flats, over 80 miles. LINK functioned hop theAnLAMBDA ply of plankton, microscopic sea me longest encountered conditions life. The plan, proposed by a young maticmatit Worcester Polytech Inst. LOOK!" student, is perfectly. YOUR "CLOSER to pump sea water through a cylin- DESERVE drical crystal at the precise fre- THESE FEATURES standards. NTSC color compcompact "suitcase" quency necessary to cause the tiny all FCC &system in COLOR Meets packaged particles to collide with one another, PORTABI LITY -Complete -7.4 KMc) to bunch up and to stick together. housing. Carrier (5.1 mile hop. style and Common used on 80 - min.; effacrieely tandem. FREQUENCY 1 watt 8 links in of KODAK OPAL PAPER, V, is & RANGE - up line POWER -link circuits a complete f proving to be a real boon to pho- U Mulct parabolas,line LONE Lambda manufactures cables, tographers making prints for repro- EQUIPMENT - . such as camera OTHER test equipment duction on TV. Suede surface on this and YOUR auxiliary regarding paper adds to the illusion of depth etc. at WESCON 128 attenuators, See us applications. BOOTH and provides a surface which is microwave virtually reflection -free. The latter is of prime importance when a print is to be placed in front of the camera.

TV TUBE SURVEY of 150 different TV receivers used in 1954 and 1955, revealed 119 different tube INC' ENGINEERING 6 -18 01 types found to be in use in these -PACIFIC State This LAMBDA Stanate YÁ801 sets. was the result of a survey conducted recently by G. E. Co. to California insure availability of replacements Van Nuys, in the G.E. tube line. (Continued on page 44)

40 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com African Torture Test proves Lp áuurtiotcspe immune to extreme heat and humidity

"The hurl Forest provides the worst possible conditions for recording work. Our camera lenses grew mushrooms, even on the inner surfaces. All leather molded in four days. Our acetate -base tapes became unuseable. But the LR Audio. tape always unwound without sticking and showed no ten. dency to stretch or curl."

s4101 4t1 COLIN M. TURNBULL, noted explorer, made the above comments on his recent return from a year -long recording expedition through the arid deserts and steaming jungles of Africa, where Audiotape on "Mylar" polyester film was subjected to the "worst recording conditions in the world." Its performance speaks for itself.

Here's positive proof that all hot -weather recording problems can be entirely eliminated by using the new LR Audiotape on Mylar e polyester film. Table I TESTS AT 75.F, 50% RELATIVE HUMIDITY During his trip from Morocco to East Africa, through the Yield Strength Breaking Strength Gold Coast and the Congo, Mr. Turnbull recorded 45,000 ft. I mil Acetato 3.7 lb 3.9 lb

of Audiotape on 1 and 2 mil "Mylar ". Not an inch of it Ib, gave 0.9 mil "Mylor" 4.2 lb, 7.6 any trouble, either in desert sun (125° temperature, 25% humidity) or in the Congo forests (85° temperature, 90% 1.45 mil Acetote 501b 5.5 lb humidity) . That's a real torture test for tape and the su- proof of Table II TESTS AT 75'F, 90% RELATIVE HUMIDITY periority of the new, longer recording Type LR Audiotape. Yield Strength Breaking Strength Made on tough but thin 1 -mil "Mylar ", it gives you 50% I mil Acetate IIII more recording time per reel, yet is actually far stronger than 41 .b. 76 lb 11/2-mil acetate -base tape under humid conditions. For better 0.9 mil "Mylar" recording in any season, ask your dealer for "Mylar" 1.45 mil Acetate .7 lb Audiotape -now available in 1, 1112 and 2 mil base thickness. Write or ask for a copy of Bulletin No. 211 containing com- The above test data, taken under conditions of both plete specifications. winter and summer humidity, show the marked superiority of 1 -mil "Mylar," not only over the thin cellulose acetate base, but over the standard 1.45 - AUDIO DEVICES, Inc. mil acetate as well. 444 Madison Avenue, New York 22, New York Offices in Hollywood - Chicago °DuPont Trade Mark Export Dept., 13 E. 40th St., N.Y. 16, N.Y., Cables "ARLAB"

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use Inquiry card on last page. 41 www.americanradiohistory.com New MALLORY FP Capacitors with snap -in mounting for printed circuits

If you are using printed circuits, Mallory can supply electrolytic capacitors with the terminal construction you need. During nearly two years of developing and manufacturing capacitors especially for printed circuit use, Mallory has created a diversified group of designs that cover most applications. SNAP -IN The latest additions to the line of FP Capacitors for printed MOUNTING TABS circuits are designed for snap -in mounting. Just push the capacitor into its slots in the circuit panel, and spring -formed tabs hold it in place, ready for soldering. You have a choice of either snap -in mounting tabs or snap -in terminals. In addition, you can select models with straight tabs and terminals. All are available in six -slot or eight -slot terminal configurations. Keyed tabs make mounting foolproof. Circuits can be printed on both sides. Shoulders on the mount- SNAP -IN TERMINALS ing tabs hold the capacitor case clear of the printed sheet. Clearance ranges up to .137 ". Positive soldering. Possibility of aluminum contamination is eliminated because the connections from the foil stop well short of the solder area. Added to these time- saving design features are the superior electrical characteristics and long life at high temperatures which have made Mallory FP Capacitors the standard of MALLORY performance throughout the industry. Write or call us today Tubular Electroltics for technical data, and for an analysis of your circuit require- Metal ments by a Mallory capacitor engineer. for Printed Circuits In addition to the FP line of capacitors, Mallory produces a special series of metal tubular electrolytics for printed circuits. One terminal is a bare wire, and Expect more ... Get more from the other a flat tab for orientation. Write or call for technical data and available ratings.

P. R. nc. Serving Industry with These Products: MALLORY Electromechanical - Resistors Switches Television Tuners Vibrators Electrochemical - Capacitors Rectifiers Mercury Batteries P. R. MALLORY & CO., Inc., INDIANAPOLIS 6, INDIANA Metallurgical- Contacts Special Metals and Ceramics Welding Materials

42 Far product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com NUMBER 3 OF A SERIES

INTEGRATED ELECTRON ICS

THE IMAGINATION FOR RESEARCH PLUS THE SKILLS FOR PRODUCTION

Hoffman Laboratories maintains a highly specialized group of engineers whose entire efforts are devoted to the complex problem of developing and producing specialized tactical test equipment for airborne navigation radar, fire control, missile guidance systems, and other advanced electronic gear. To meet the high standards of quality and reliability set by Hoffman Laboratories, this test equipment group is an integral part of the engineering staff. For the past 13 years Hoffman Laboratories has been successfully solving advanced design and development problems in electronics. During this time Hoffman Laboratories has never undertaken a development program that has not successfully gone into production. Write the Sales Department for your copy of "Report From Hoffman Laboratories:'

Radar. Navigational Gear Missile Guidance & Control Systems A SUBSIDIARY OF HOFFMAN ELECTRONICS CORPORATION Noise Reduction Countermeasures (ECM) Computers Communications Challenging opportunities for outstanding engineers to work in an atmosphere of creative engineering. Transistor Application Write Director of Engineering, Hoffman Laboratories, Inc., 3761 S. Hill St., Los Angeles 7, California.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 43 www.americanradiohistory.com SIMPLIFY CIRCUIT TRIMMING with TEL

13 D URNS r11 sub -miniature (Continued from page 40)

PRINTED CIRCUITS assembled 3 TIMES SPOTS by automation have eliminated 425 ACTUAL hand soldered connections from SIZE Admiral Corp's new TV receivers. AN EARMUFF that fits over the head like a phone set and covers each ear to muffle sound of every One of many applications frequency, has been developed at when space is at a premium Worcester Polytechnic Institute by Prof. William D. Wadsworth, several graduate students, and the David l M. Clark Co. It is useful in jet engine testing where sound alone can vi- brate the leather soles on a man's shoes.

PARACHUTES are in great demand today if they can withstand the pressures for which they are being put to use in the aviation industry, according to a report of the Air Force's Wright Air Development ..... _.: _ Center. Used in the recovery and I operation of guided missiles, and used for deceleration of near sonic and supersonic aircraft, the present so- called "marginal" materials are fast creating the need for better RESOLUTION: AS LOW AS 0.25% and stronger parachute materials. POWER RATING: 025 WATT AT 100° F. MATHEMATICIANS ASSOCI- WEIGHT: ONLY 0.1 Oi. ATED with Cook Labs had this to say on earthquakes and music: "If BOURNS TRIMPOT is a 25 turn, fully adjustable wire -wound 5000 Earthquake records are sold potentiometer, designed and manufactured exclusively by BOURNS each week for 50 weeks per year LABORATORIES. This rugged, precision instrument, developed expressly for 5 years, a statistical analysis for trimming or balancing electrical circuits in miniaturized equipment, will show that the moment must is accepted as a standard component by aircraft and missile manufac- arrive when exactly 97,256 hi -fi turers and major industrial organizations. systems more will play the Accurate electrical adjustments are easily made by turning the or earth- exposed slotted shaft with a screw driver. Self- locking feature of the quake together. At this time, if the shaft eliminates awkward lock -nuts. Electrical settings are securely woofers are in phase, the western maintained during vibration of 20 G's up to 2,000 cps or sustained hemisphere should disintegrate. acceleration of 100 G's. BOURNS MOOTS may be mounted indivi- This is High Fidelity's answer to dually or in stacked assemblies with two standard screws through the the Hydrogen bomb. body eyelets. Immediate delivery is available in standard resistance values from 10 ohms to 20,000 ohms. BOURNS TiIMPOTS can also be furnished with various modifications including dual outputs, special SCRAP -HAPPY Poles are a resistances and extended shafts. headache to their Communist gov- Swims also manufactures precision potentiometers ernment officials. The Voice of to measure Linear Motion; Gage, Absolute, and America quotes a Polish provincial Differential Pressure and Acceleration newspaper as reporting that unknown parties in the small seaport city of Szczecin (Stettin) are cut- J3OIJRNS LABORATORIES ting up telephone cables and selling them for scrap. Particular damage is 6135 MAGNOLIA AVENUE, RIVERSIDE, CALIFORNIA being done to the local government's Technical Bulletin On Request, Dept. 172 inter -agency phone system. (Continued on page 50)

44 For product information, use inquiry card on Iasi page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Intern Tonal hgb0 /e

See the complete INTERNATIONAL LINE at the WESCON SHOW

SAN FRANCISCO AUGUST 24 -25 -26 BOOTH 921

The WIDEST RANGE in the INDUSTRY

*Power Ratings from Microwatts to thousands of Kilowatts! *Efficiency to 87`,;

The most widely used Industrial Power Rectifiers in industry International Rectifiertoday. C O R P OR A T I O N

EXECUTIVE OFFICES: 1521 E. GRAND AVE., EL SEGUNDO, CALIFORNIA PHONE OREGON 8.6281

New York Office: 501 Madison Avenue, Phone PLaza 3-4942 Chicago Office: 205 West Wacker Drive, Phone FRanklin 2 -3889

In Canada: Atlas Radio Corp., Ltd., 50 Wingold Ave. W., Toronto, Ontario Phone RU 1 -6174

WORLD'S L A R G E S T S U P P L I E R O F I N D U S T R I A L M E T A L L I C RECTIFIERS

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last paoc. 43 www.americanradiohistory.com Allied Radio Corporation 100 North Western Avenue,., o, Illinois Arrow Electronics, Inc. 65 Cortlandt Street, New York 7, New York

Art Electronic Supply Co. 145 South Pork Street, Tucson, Arizona Burstein -Apple bee 1012.14 McGee Street, Kansas City 6, Missouri

California Electronic Supply, Inc. 11801 W. Pico Boulevard, West Los Angeles 64, Calif. Capitol Radio Wholesalers, Inc. 2120 Fourteenth Street, N.W., Washington, D. C. Cramer Electronics, Inc. 811 Boylston Street, Boston 16, Massachusetts

Dalton -Hege Radio Supply Co. 924 W. Fourth Street, WlnstonSolem, North Carolina Dean's Electronics 969 American Avenue, Long Beach, California Durrell Distributors 222 Mystic Avenue, Medford, Massachusetts East Coast Radio & Television 1900 N. W. Miami Court, Miami 36, Florida Electronics Center, Inc. 211 West 19th Street, New York, New York Electronic Equipment Distributors 1228 Second Avenue, San Diego, Californio

Fed d Purchaser, Inc. 66 Dey Street, New York, New York

Herbach & Rademan, Inc. 1204 Arch Street, Philadelphia 7, Pennsylvania Hughes -Peters, Inc. these I 1 1 East long Street, Columbus, Ohio Interstate Electronics Co. INDUSTRIAL 227 Fulton Street, New York, New York JOBBERS offer Kann- Ellert Electronics, Inc. 9 South Howard Street, Baltimore, Maryland A COMPLETE LINE Kieruiff Electronics, Inc. of PYRAMID capacitors 820 West Olympic Boulevard, Los Angeles, California Lukko Sales Corp. and rectifiers 5024 West Irving Park Rood, Chicago, Illinois In your design development and your pilot production even minutes Miigray Electronics, Inc. 120 liberty Street, New York, New York In be important. For your convenience the jobbers listed at the right carry in stock a complete assortment in adequate quantities of Pyramid's Milo Radio & Electronics 200 Greenwich'Street, New York, New York line of highest quality electrolytic aid paper capacitors, both commercial and MIL -C -25B types, metallized Newark Eleètric Co.. 233 West Madison Street, Chicago. iilinois paper capacitors and a complete range Niles Radio & Phonograph Co. of Kool -sel selenium rectifiers, 1254 Arai aloe Street, Denver, _ ..,. the first new desigi in Olive Electronics Supply Corp. over 20 years. 6711 Olive Boulevard, Univers.: Cry 5, Ms.. Peerless Radio Distributors 92 -32 Merrick Road, Jamaica .ew York

Fred P. Purcell Company 1221 -27 N. Washington Ave., Scranton, Pennsylvanie

Radio & Electronic Parts Corp. 3235 Prospect Avenue, Cleveland, Ohio Radio Specialties Company 1946 -56 South Figueroa Street, Los Angeles, Californio Srepco, Inc. 314 Leo Street, Dayton, Ohio

Standard Electronic Sales Corp. 1505 Main Street, BuP.olo 9, New York

Albert Steinberg & Co. 2520 North Brood Street, Philadelphia, Pennsylvania

Sterling Radio Products Co. 1616 McKinney Avenue, Houston 1, Texas

Walder Radio & Appliance Co. www.americanradiohistory.com 1809 North Second Avenue. Miami 37 Flnridn fETHER USES FOR SPEED NUTS

Time -saver, space- saver, money -saver .Tinnerman tubular SPEED CLIP! Tubular SPEED Ct.APs save 51 °;, in time. 34% in cost, assembling Drive -In auto speakers. Here's how the General Electric Company is keeping costs and space requirements low on its G -E oiltight Indicating Lights. 0 0 They use Tinnerman tubular -type SPEED CLIPS to assemble r) Tg © the resistor to its support. This one - piece, spring -steel fastener reduces assembly time, material costs, parts handling and inventory by eliminating a long bolt, centering washer, lock washer and nut. It also reduces the dimension across the resistor support and saves valuable space when the lights are used close to pushbuttons and other components. Push -On SPEED NUTS save 5(N';, A wide variety of sizes of in assembly of rotating TV- types and tubular -type SPEED CLIPS are used antenna control box. on everything from toys to autos -on metal, plastic or wood. They snap into punched or molded holes by hand; are self -retained in stud -receiving position. SPEED CLIPS are also ideal for blind attachments where only one side of an assembly is accessible. Possibly Tinnerman SPEED NUT brand fasteners can help you improve your present fastening methods. See your Tinnerman representative soon and write for your copy of "SPEED NUT Savings Stories ".

TINNERMAN PRODUCTS, INC. BOX 6688, DEPT. 12, CLEVELAND 1, "J" and "U" type SPEED NUTS OHIO help gain 50°;, assembly saving Canada: Dominion Fasteners, Limited, Hamilton, Ontario. Great Britain: Simmonds Aero- on jet-convector heater. cessories. Limited. Treforest. Wales. France: Aerocessoires Simmonds, S. A., 7 rue Henri Darbusse, Levallois (Seine). Germany: Hans Sickinger GmbH "MECANO ", Lemgo -i- Lippe.

T//V/V ERMA /V

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 47 www.americanradiohistory.com - LAD

When it proves itself in products like these...

Do -It- Yourself Hi -Fi Unit. The circuit panel of Copper -Clad Pheno- lite makes this 20 -watt pre -tab amplifier easy to assemble, using only a screwdriver. The printed circuit also helps assure pure, clean, reproducible response.

Tom Thumb radio set shows how Copper -Clad Phenolite aids miniaturization. The printed circuit of this tiny radio measures only 23A.," x 11/4". Yet the rango is such that a polar expedition chose the set as part of its equipment.

Printed circuit -18" x 21" -for a modern computor. The panel contains more than 1,000 through -holes for connection soldering. all of which are pierced in one operation! This shows the fine workability of Copper - Clad Phenolite and its ability to eliminate complex wiring, costly operations, expensive components.

know it's best for any printed circuit

The most widely used foundation material for printed circuits is Copper -Clad Phenolite by National. Reason? Copper -Clad Phenolite -in its many grades - possesses all the properties and characteristics demanded for the job. This scientifically compounded laminate has high dielectric and mechanical strength, resistance to heat, moisture, solvents, oils, acids, alkalies. Also, it's light in weight -easy to machine, punch, saw, drill and solder. You can't buy a more dependable, versatile, cost -cutting Switch plates, commutator discs, and material than Copper -Clad Phenolite. Write us today. drum commutators with printed circuits have proved themselves in many diversified applications. Low -cost printed circuit YOUR GUIDE TO PRINTED CIRCUIT SIMPLIFICATION. switches are ideal for simple switching, You'll find this booklet a most helpful tool in and show up to best economical advantage in complex switching functions. achieving miniaturization or automation. Com- plete coverage of basic technical facts and design data related to applied printed circuitry. Methods of producing printed circuits and economies in design are fully treated. For your free, personal copy of "Mechanize Your write Dept. -8 IN THE WEST: Wiring," K San Francisco 273 Seventh Street Las Angeles 2325 E. 8th Street Seattle 4001 Whitman Avenue 1VATtO1VAL IN CANADA: t 171LTI.C.IiLMT CO. National Fibre Company of Canada, Ltd. Toronto 3, Ont. IZEI) FIBRE

W I L M I N G T O N 99, D E L A W A R E

Also Manufacturers of Peerless Insulation, Materials Handling Receptacles, Vul -Cot Wastebaskets and Textile Bobbins.

48 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com EStTER FLUXsow CORE going...

gone!

KESTER "44" RESIN, PLASTIC ROSIN AND "RESIN- FIVE" FLUX -CORE SOLDERS owe their production line popularity to the simple fact that they provide the exactly right solder for every soldering application. It's not difficult to realize why Kester is consumed so rapidly ... because of its great adaptability to so many different soldering operations.

SEND TODAY for Kester's new 78-page informative textbook "SOLDER ...Its Fundamentals and Usage."

KESTER S R 4210 Wrightwood Avenue, Chicago 39, Illinois; Newark 5, N. J.; Brantford, Canada

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry cord on last page. 49 www.americanradiohistory.com And now TELE-TIPS for AC applications as well . . . rt1

(Continued from page 44)

TELEMETERED INFORMATION from high -flying balloons is providing Air Force scientists with a picture of the electrical fields and currents produced by thunderclouds, and also on the changes caused by lightning discharges to the ground or other charged centers. The balloons are being launched from Or- lando AFB, Florida.

RADIOACTIVE DIRT is being used by scientists at Westinghouse Research Labs to determine what physical and chemical forces hold dirt to cloth and how detergents, agitation and water temperature break down these forces. Dirt is "tagged" by incorporating radioactive carbon as an ingredient, then radiation is measured before and TYPE ACD CERAMIC DISK CAPACITORS after washing.

To meet the more severe conditions of AC operation - especially NUCLEAR ENGINEERING spe- electric -razor noise suppression and certain TV by -pass applications - cialists of Minneapolis -Honeywell Hi -Q specialists now come up with the new Series ACD ceramic disk capacitors. have designed and built a working mock -up model of an automatic You can effect marked economy by using Hi -Q ACD's in applications electronic control system for nuclear calling for steady or intermittent AC voltages. Thicker dielectric reactors which they will exhibit at and other heavy -duty features take care of voltage peaks. Voltage ratings the International Atoms -For -Peace to be held in Geneva, are guaranteed. Underwriters' Laboratories requirements Conference Switzerland, Aug. 8 to 20. (a ceramic capacitor used in AC applications shall withstand a 1500 VAC 60 -cycle 1- minute test) are fully met. THE AUDIO BUG is breeding its Also: Power factor (initial) of 1.5% max. at 1000 cps. Working voltage own type of petty larceny. Cook of 900 AC, or 1500 DC. Initial leakage resistance better than Labs reports a number of cases in 7500 megohms; higher than 1000 megohms after humidity test. which customers are paying for diamond cartridges or stylii but are actually receiving sapphire. The re- Write for literature on these and port warns that only an expert in other Hi -Q Ceramic Capacitors. precious stones can distinguish the Get the Let our ceramic specialists collab- difference, then advises: avoid "bar- orate on your requirements. Let gains," and trade at a reputable us quote. dealer.

NEW TOOL MATERIAL that pro- AEROVOX CORPORATION vides good tool life at speeds of OLEAN, N. Y. 2,000 ft. /min. has been developed by alma AEROVOX CORPORATION, NEW BEDFORD, MASS. ACME ELEC- the Carboloy Dept. of G.E. Still in TRONICS, INC., MONROVIA, CALIF. CINEMA ENGINEERING CO., the laboratory stage, the new cutting BURBANK, CALIF. HENRY L. CROWLEY 8 CO., WEST ORANGE, N. J. tool is made entirely of inexpensive In Coned*. AEROVOX CANADA LTD., Hamilton, Ont. materials available in abundant JOBBER ADDRESS: 740 l.U.siIt. An ., New Bedford, Mou. supply.

50 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com for tall towers talk to Truscon

Truscon builds them tall (and small, too) for all types of topography ... to withstand the extremes in wind and weather. Whatever your requirements, Truscon, with modern and efficient manufacturing facilities, can create the tower you want ... guyed or self - supporting ... tapered or uniform in cross -section ... for AM, FM, TV and Microwave transmission. And no matter what forces are exerted upon them, they stay in the air to keep you on the air day -in and day - out, year -in and year -out. In recent East Coast hurricanes not a single Truscon Tower was damaged by the terrific onslaught of high winds -a dra- matic demonstration of their great stability and dependability. You can get this kind of dependable performance every time with a Truscon Tower. Our engineers have designed and built hundreds which today stand sturdy and straight and tall in all parts of the world. They can design one for you, too. To get your tower program started, just write or call your nearest Truscon district office or "tower headquarters" in Youngstown. WFMJ-TV, Youngstown, Ohio -1000 feet high

TRU51'ON' TRUSCON STEEL DIVISION REPUBLIC STEEL 114.11 isß 1092 ALBERT STREET YOUNGSTOWN 1, OHIO .... Export Dept.: Chrysler Bldg., New York 17, N. Y.

A N A M E Y O U C A N B U I L D O N

WBAP -TV, Fort Worth, Texas -1113 feet high

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 53 www.americanradiohistory.com reuolutíonary ALUMINUM CORE BOXT construction

withstands HIGH TEMPERATURE VACUUM IMPREGNATION HEAVY WINDING STRESSES SHOCK and VIBRATION Immediately available in 109 standard sizes, using all commercially This is a development which calls for immediate changes in purchasing specifications for Tape Wound Cores, because intro- available magnetic materials. duction of the Aluminum Core Box means designing your toroids around four important new advantages: ALL / r' I. Use of an aluminum core box means the new Magnetics, Inc. tape wound cores will withstand temperatures of at least 450° F. 2. Because of the unusual seal provided by forming the aluminum For full details, write for over the silicone glass seal, true vacuum impregnation of your coils is now possible. Varnish cannot penetrate the core box and Bulletin TWC -200 affect magnetic properties of the tape. Catalog TWC -100 3. The strong aluminum construction absolutely prevents deflection of the core box when coils are wound -a distortion -free construction which means no change of magnetic properties. 4. Cushioned with an inert material, the tape winding in the core box is protected against vibration and shock. In most cases it is 17711G17 ET/CS inc. so completely minimized that it is no longer a problem. Because of the many advantages of these new Magnetics, Inc. Tape Wound Cores, it will pay you many times over to specify "Alumi- num Core Boxes" on your next order. tPAT`NT FENDING DEPT. TT -21, BUTLER, PENNSYLVANIA

54 For product inlo:mc "on, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com SARIGAI 1\1-g3 3PC10W30 R

No single piece of radio equipment can equal the antenna for economically increasing effective power.

One of the less expensive components in a radio communications installation is the antenna. Yet the antenna, which usually represents less than ten per cent of the total equipment cost, can multiply the effective power of every transmitter in the system several hundred per cent. Equally true, a poorly designed or inappropriate antenna can waste the Manufacture Of power produced by the the UNIPOL -, costly equipment behind it. High Gain Corner Reflector, In planning a new system, Parabolic and Vagi selection of the proper Antennas antenna often will allow a lower power transmitter to achieve desired signal range. For existing systems, the use of a higher gain antenna will reduce "dead spots." Andrew is a pioneer in designing and developing antennas. We make ove- 30 standard types for microwave, broadcast aid mobile communications. Special models or adaptions of standard models are readily made to order. Write or phone Andrew for a dollars -and -cents evaluation of the type of antenna that can give your installation the greatest bargain in power.

C O R P O R A T I O N 3 6 3 EAST 75th STREET CHICAGO 19

OFFICES: NEW YORK BOSTON . LOS ANGELES TORONTO

TELE.TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 55 www.americanradiohistory.com YOO/R ONLY SOWCE of a Complete Line of MAGNETIC MATERIALS

Arnold products include all grades of Alnico permanent magnets (cast and sintered) ... tape -wound cores of high -permeability alloys, such as Deltamax, Permalloy and Supermalloy ... types "C" and "E" cut cores of Silectron in any size or weight range from a fraction of an ounce to hundreds of pounds TECHNICAL DATA ON (50 lbs. max. on 12 -mil C cores); also round, square and rectangular Silectron Mo- Permalloy cores Cunife, Vicalloy, Permendur and ARNOLD PRODUCTS Write cores ... powdered ...... other magnetic materials. Special magnetic components can be produced to for your copy. meet your specific requirements; and such products as powder cores, tape - wound cores, and C and E cores are carried in stock in a wide range of standard sizes for immediate delivery. Many sizes of cast and sintered Alnico magnets

Bulletin GC-106 A . General information on also are stocked. all Arnold magnetic materials: permanent mag- In other words, Arnold magnetic materials can answer any requirement nets, tape -wound and powder cores, etc. you may have. It is the only complete line in the industry; and in addition, Arnold maintains complete control over every production step from raw Bulletin TC-I01 A ... "Properties of Deltamax, materials to finished products. Such a source can bring you advantages in 4 -79 Mo- Permalloy and Supermalloy " -28 pages and undivided responsibility, and in unequalled facilities for of technical data on Arnold Tape -Wound long experience Cores. quality production and control. Let us supply your needs. Bulletin PC-104 A ... "Molybdenum Permalloy WAD SACO Powder Cores " -16 pages, complete technical data. Bulletin SC- 107 Arnold Silectron Cores" - PE ARNOLD ENGINEERING COMPANY 52 pages of valuable data, covering a complete range of core shapes, sizes, tape gauges, etc. SUBSIDIARY OF ALLEGHENY LUDLUM STEEL CORPORATION General Office & Plant: Marengo, Illinois ADDRESS DEPT. T -58 DISTRICT SALES OFFICES ... New York: 350 Fifth Ave. Los Angeles: 3450 Wilshire Blvd. Boston: 200 Berkeley St.

56 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com NEWR-C

- Oscillator J .>,. Type 1210 -B becomes 3 -watt R -C Oscillator For More Power ... !/ _ with Type 1206 -B Unit Amplifier, $85 and Unit Power Supply, $40.

POWERRSUPPLY

m ...... IM/ r s t + mo Becomes Sweep Generator ... with easy -to- attach Type 908-P mriró, auE Synchronous -Dial Drive, $27.50, and Type 1210 -P1 Discriminator, $75 (at right), for supplying CRO voltages.

Type 1210 -B Unit R -C Oscillator, $140, with Type 1203 -A Unit Power Supply, $40.

The new Type 1210 -B Unit R -C Oscillator is a unique audio, supersonic a radio -frequency generator ... providing both square waves and sine wa% over the range from 20 cycles to 0.5 Mc. Its wide range, multiple output s: tem, easy adaptability to sweep operation and extreme versatility, make a must for every development and measurement laboratory. Features inclut Automatic Data Taking...with pen -type recorder or CRO eliminates laborious point -by -point measure- * Slow- Motion Frequency Control: for small frequency increments; each ments ... in photo, frequency response of small loud - decade covered by 411 turns of knob. speaker is recorded. * Precision Dial: can be motor driven by Type 908 -P Synchronous -Dial Drives for automatic display of amplitude- frequency characteristics; 908 -P1 covers one frequency decade in 50 sec, 908 -P2 takes 6% sec per decade ... $27.50 for either. * Three Outputs: Low -Voltage, Low- Impedance (0 to 7 v, 5012); constant within ±1 db to -200 kc; less than 1% no load distortion from 200 c to 20 kc, less than 1.5% over entire range; hum at least 60 db down. High- Voltage, High -Impedance (0 to 45 v, 12.5 kß): constant within ±1 db and less than 5% distortion at no load from 200 c to 200 kc (decreases to 2.5% udder load); hum at least 50 db below Network Transient investigations ...with R -C oscillator square waves; one measurement gives information on both amplitude and maximum output. phase characteristics in photo, engineer observes and records ... Square waves (0 to 30 v peak -to- peak) : 2500 output impedance; filter characteristics of G -R Type 1550 -A Octave -Band Noise Analyzer. less than 0.25µs rise time and 1% overshot; hum at least 60 db down. * Adjustable Output Control: logarithmic, calibrated 0-50 db. * AVC System: fast response, insures constant output under fluctuating line voltage. * Power Supply: Type 1203 -A recommended for use on 115 v, 50 -60 cycle power; Type 1202 -A Unit Vibrator Power Supply for field operation from standard 6 v or 12 v storage battery. * Rack Mounting Provision: Type 480 -P4U3 Relay Rack Panel, $12.50, for laboratory use.

As Bridge Genera or...shown with new G -R Universal Audio -Frequency Bridge and Type 1212 -A Unit Null Detector, $145. The G -R Unit R -C Oscillator is the latest addition to the ever growing, e' more useful line of G -R Unit Instruments. G -R Unit Oscillators are now available for coverage from 20 cycles to 2000 Mc ... the Unit Pulse Generator provides pulse durations of 0.2- 60,000 µsec with repetition rates from 30 c- 100 kc, and rise times of 0.05 psec . .. the Unit Null Detector has better than 40 µv sensitivity ... a Unit Amplifier is available with 3 -watt maximum 20 c kc range the As Modulator... Unit -R -C Oscillator square -wave output and -to -250 ... Unit modulates the recently announced Type 1218-A UHF Unit Crystal Oscillator has short -term stability of I ppm ... the Unit Oscillator, $465., with 900 -2000 Mc range. I -F Amplifier is a basic component in the 50 -5000 Mc G -R High - Frequency Null Detector ... this apparatus, compact, intercon- nectable, rugged and reliable in performance, represents the most in instrumentation value per dollar available anywhere. WE SELL DIRECT. Prices are net, F.O.B. Cambridge or West Concord, Mass.

GENERAL RADIO Compan

"27S311er'sloci,vi ëtts A a öe.Comb, dee 39. Massochusaes, U 5 X. Five G -R Unit Oscillators. 90 West Street NEW YORK 6 8055 13th St., Silver Spring, Md.WASHINGTON, D. C. in Electronics www.americanradiohistory.comnsnvn,kRead Ahinotnn P. PHIIAMIPMI& BOOKS I. d v -tn`° E Amplitude Frequency Character- o á on 7 ÿ ó w g .+" istics of Ladder Networks «: c wo oa úao x s. By E. Green, M.Sc. Published by Marconï s >~ Wireless Telegraph Co., Lid., Marconi House, ..., cr-.6 O. ,; d N cn . Chelmsford, Essex. 155 pages, price $6.50. ca-ti to ú , 3 ai x á 'ó One of the first books published deal- , 4.s.,° 0 C', yo U c¡ ro G) N G) ing with the synthesis and analysis of N as o vi o .!~i networks d ÿ ÿ b Ú,--t .-. m filter type by means of mod- tn ern network theory. It is of particular C.' ..4 > so. N L, 2 i: "Ti A.+ .. ca a) value to the design engineer who is ó ó CO a) o CO most in need this modern ou a oo ia >g u of network ,Vs F Ñ wiUi . á theory design information, since he m w C ö R, . must not only deal with the general v s. concepts and qualitative ideas G u.í co1 required o ' Ç ú s w nn by modern electronic systems but must .". =o y ó ÿ :r-. , ÿ . also be concerned with the actual nu- Ñ Ñ ttl y x á w. y b CO C q merical performance of the circuits. Ñ, CO .bo G) s. o Gl CO The circuits the author considers are o W x a) u N .SU.' .+ Ú d .+ w i, the much -used inverse arm low pass G) ..U. a) y b and band pass ladder networks plus the .0 O R N ta f.. many circuits equivalent to these lad- C Q. Ú a) o g4 bi) vs a) ders. Much information is supplied to Q. all types of engineers who use these v a d ó ÿ v N :e0 o ..7+ networks as transfer devices, such as - > en a In al ra cs.. y z z'Q, , GL o a the reactive generative - resistive load b u ÿ a p >, x . ÿ rÓ w + situation; the reactive generative -reac- a , .y rö u tn o FI -0 3 tive load situation; and the resistive t~ ó a gcu Ñ generative-resistive load situation. : ß c°1 ó w '3 cil TV and Radar Encyclopedia & N ` o N ^ty i°1. g. _0 3 C By W. MooLanaehan. .+ ¢ w Published 1954, second s. edition, by Pitman Publishing Corp., 2 W. á 45 Si., New York 36, N.Y. 216 pages, price $6.00. Q, 1é This book was specially compiled to meet the need for a reliable guide to the principles, practice, and terminology of TV and radar. As a result of the rapid advance of television technique both in the U.S. and Great Britain, there became an increasing need for a reference book which would give a quick and reliable answer to any question which might occur to the engineer who was concerned with the design ant production of TV equipment, the operation of a TV studio, and theatre television. The present edition includes such new developments as Automatic Picture Control, Compatible Color TV Systems, Flywheel Synchronization, Thermistors and Transistors, and others. Published in Great Britain, it contains several outstanding articles contributed by renowned British scientists and engineers. Some of the articles are: The Ionosphere, by Sir Edward Appleton, F.R.S.; The Fluorescent Screen, by W. Wilson, D.Sc., B.Eng., M.I.E.E.; and The Future of Theatre Television, by Sir Robert Watson -Watt, C.B., D.Sc., LL.D., F.R.S., M.I.E.E.

Fundamental Formulas of Physics By Donald H. Menzel. Published 1955 by Prentice.Nall, 1nc., 70 Fifth Ace., New York, N.Y. 765 pages, price $10.65. A practical handbook of physical for - (Continued on page 60)

www.americanradiohistory.com MISSILE SYSTEMS Research and Development

Broad interests and exceptional abilities are required of scientists participating in the technology of guided missiles. Physicists and engineers at Lockheed Missile Systems Division are pursuing advanced work in virtually every scientific field.

Below: Missile Systems scientists and engineers discuss future scientific exploration on an advanced systems concept with Vice President and General Manager Elwood R. Quesada. From left to right: Dr. Eric Durand, ,nuclear physicist, systems research laboratory; Ralph H. Miner (standing), staff division engineer; Dr. Montgomery H. Johnson, director, nuclear research laboratory; Elwood R. Quesada; Dr. Louis N. Ridenour (standing), director, program development; Willis M. Hawkins (standing), chief engineer; Dr. Joseph V. Charyk (standing), director, physics and chemistry research laboratory; Dr. Ernst H. Krause, director, research laboratories.

Western Electronic Show and Convention, San Francisco, August 24 -26. Karl E. Zint, C. T. Petrie and senior members of the technical staff will be available for consultation at the convention. For interview phone Exbrook 2 -3434 in San Francisco.

MISSILE SYSTEMS DIVISION research and engineering staff

LOCKHEED AIRCRAFT CORPORATION VAN NUYS, CALIFORNIA

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accuracy is (Continued from page 58) mulas, with emphasis being placed on intermediate steps previously unavail- able. Closely integrated topics such as physical chemistry and biophysics VITAL! make the book indispensable to all research workers. Twenty -six sections presented in a completely modern You Can mathematical approach, covering, in addition to basic physics, certain cross - Depend On ARC areas where physics touches upon chemistry, astronomy, meteorology, Test Equipment biology, and electronics. For example, the chapter on Electromagnetic Theory has been designed to meet the needs of both engineers and physicists. Of particular interest to engineers would be such chapters on Kinetic Theory of Gases, Heat and Thermodynamics, Electronics, Electron Optics, Sound and Acoustics, and the Theory of Magne- tism.

Fundamentals of Radar

Oy ndee Knight, edition, by PmenPitmen Pub fishing Corp.,o second diti 150 pages, 2 W. 45 St., Neu, York 36, N.Y. price $3.00. A basic survey of the principles underlying radar, dealing with the development and methods of the technique from the last war to the present time. The author has endeavored to show how the unusual circuit tech- The Type H -14A Signal Generator has two niques of pulse generators and re- uses: (1) It provides a sure and simple means ceivers can be stripped of their com- in the fa- of checking omnirange and localizer receivers in plexities and be presented of radio and television the field, by sending out a continuous miliar aspects aircraft on engineering. Chapters on Trigger and test identifying signal on hangar antenna. Tuned Pulsing Circuits, Saw -Tooth Gener- to this signal, individual pilots or whole squad- ators, Cathode -Ray Indicator Devices, and rons can test their own equipment. The instru- Pulse Transmitters, Waveguides, Type H -14A illustrated throughout with ment permits voice transmission simultaneous others are Signal Generator schematic diagrams, showing wave with radio signal. (2) It is widely used for mak- shapes and circuit designs. ing quantitative measurements on the bench during receiver equipment maintenance. Dictionary of Television, The H -16 Standard Course Checker meas- Radar and Antennas ures the accuracy of the indicated omni course Onion. Type H -16 in ARC's H -14A or other omni signal genera- By PublishingP Co,, Neu, York, N.Y. Price $21.50. Standard Course Checker tor to better than 1/2 degree. It has a built -in This dictionary is compiled and ar- base method of checking its own precision. ranged on an English alphabetical English /American, Signal Generator (900 -2100 mc) in six languages, Type H-12 French, Spanish, Italian, Dutch and is equal to military TS- 419/U, and provides German. For each language there is an a reliable source of CW or pulsed rf. Internal alphabetical listing of words, referring the circuits provide for control of width, rate and to the corresponding numbers in basic table, and there are over 2450 delay of internally -generated pulses. Complete of H definitions of words. A system : Type -12 on request. UHF Signal Generator specifications furnished thumb -indexing enables finding any language at once. The author and pub- Dependable Airborne Electronic Equipment Since 1928 lisher have been guided by certain principles proposed by the United Na- tions Educational, Scientific, and Cul- Radio Corporation tural Organization (UNESCO), the ob- Aircraft ject being to insure that each diction- BOONTON, NEW JERSEY ary produced shall fit into place in a it is hoped may extend UHF and VHF pattern which Omni Receivers 900 -2100 Mc Signal Generators - related fields of science 8 -Watt Audio Amplifiers 10- Channel over all inter Receivers and Transmitters 64) Isolation Amplifiers LF Receivers and Loop Direction Finders (Continued on page

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Motor can be designed for speeds from 6000 RPM to 20,000 RPM. TORQUE AT OUTPUT SHAFT GEAR RATIO OF GEAR TRAIN Length of motor will vary according to power. OZ. IN. Length of gear train will vary according to gear ratio required- 25 15:1 to 33,000:1 1000:1 to 33,000:1 6 stages 100 15:1 to 33,000:1 300:1 to 5,900:1 5 stages 300 15:1 to 33,000:1 100:1 to 1,000:1 4 stages 400 15:1 to 5,500:1 40:1 to 183:1 3 stages 600 15:1 to 5,500:1 15:1 to 32:1 2 stages Other products include Actuators, AC Drive Motors, DC Motors, Fast Response Resolvers, Servo Torque Units, Servo Motors, Synchros, Reference Generators, Tachometer Generators and Motor Driven Blower and Fan Assemblies. join is in booth 237 at the Wescon Show

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TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry cord on last page. 61 www.americanradiohistory.com Texas Instruments grows crystals for both silicon and germanium transistors in the industry's largest installation of crystal pullers. Designed and built by TI, these unique crystal pullers have helped make TI's transistor production capacity the largest in the nation!

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and technology and cover all necessary ^--- R -F ENCLOSUR languages. Recent Gov't Publications j- For the Electronic Industry

SERVOMECHANISMS Research in Non -Linear Mechanics as Applied To Servomechanisms

IT right Air Development Center, U.S. Air Force, Dee. 1953. 148 pages, with illustra- tions. (Order PB 111584 from OTS, U.S. Department of Commerce, Wash., 25, D.C., price 53.75.

Case Study in Automation Production Control Through at the lowest Electronic Data Processing: price ever A Case Study 52 pages, (Order from OTS, U.S. Dcp'i. of Commerce. IT ash.. 25, D.C. Price 81.50) Offering all the advantages of quency range, typical of all Ace 1 sheet metal construction, Ace's shielded enclosures. See curve New Oscilloscope Components new galvanized sheet metal en- below. A Wide -Band Pulse Amplifier for closure is easily erected - ideal This new low priced en- High Speed Oscillography for use indoors or out readily closure uses the famous patented - \'at al Research Laboratory. Sept. 19.5 S. 23 weather -proofed for any climate Lindsay Structure, with solid pages. (Order from OTS, U.S. Dept. of - safely transported assembled 24 gauge galvanized steel panels Commerce, Wash., 25, D.C. Price 7Se.) or disassembled - ideally suited fastened to rigid steel channels for mobile units -constructed to forming leak -proof seams. Serv- Development of the Optical take a real beating in the toughest ice entrances can be provided. Imaging Oscilloscope kind of service. to meet every need, from power (Optimascope) Furthermore, you get top at- and water to forced air ventila- Naval Research Lab., Oct. 1954. 6 pages. tenuation across the entire fre- tion or air conditioning systems. P8111554, OTS, U.S. Dep't. of Commerce, Wash., 25, D.C. Price 50e.

Get complete information now on Ibis neu solution for TUBES your r -f interference problems. 'Write for new catalog which contains performance and construction data on Techniques for Application of every type of ACE Shielded Enclosure. Electron Tubes in Military Equipment

PB 111644, is atailable from OTS, U.S. Dep't. of Commerce, Wash., D.C. Price $2.50. This report presents 100 pages of tuba information from the point of view of the electronic design engineer. Plotted by an inde- .11111110111111111111 pendent electronic interference measure- saotUllll t ment laboratory. Tropospheric Propagation 111111101111E111111101111E2 1 Illll1111p1l1lIlIl111111t.1B11 Research

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"(Out NC? met roo ioo Radio Interference Suppression Techniques & INC PB 11161 I. Nor. 1953, may be obtained from ACE ENGINEERING MACHINE CO., OTS, I .s. Dep't. of Commerce, Wash.,25, D.C. Prier T6.75. A 270 page manual to assist 3644 North Lawrence Street . Philadelphia 40, Pennsylvania manufacturers of equipment for the Armed 66) SEE US AT THE WESCON SHOW -BOOTH 264 (Continued on page

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For product information, use inquiry cord on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 65 www.americanradiohistory.com All roads lead to BOOKS

A WESCON (Continued from page 64) Forces to meet the requirements of radio. show interference specs. August 24.25.26 Cooling Fluids for Aircraft Heat -Transfer Fluids for Aircraft Equipment Cooling Systems

PB 111593, (Order from OTS, U.S. Dep't. of Commerce, Wash., 25, D.C. Dated Feb. 1954, San Francisco, Calif. 183 pages, price 84.75.)

Sonic Treatment and Wood and the Testing Application of Ultrasonic and Sonic Vibrations for Improvement and Testing big new of Wood (Final Report 1951). PB 711556, OTS, U.S. Dep't. of Commerce, Wash., 25, D.C. 59 CANNON pages, price $1.50. Formulas for Computing Booth . Capacitance and Inductance By Chester Snow, National Bureau of Standards Circular 344, 37 figures, 69 pages, price 40c. (Order from the Goat Printing Office, Wash., 25, D.C.) you'll see ALL THE NEW ELECTRIC Books Received CONNECTORS 150 new or standard sample connectors will be on display! Servomechanisms and Regulating System Design You can handle them By Harold Chestnut and Robert W. Mayer, pub- Inspect them to your heart's content lished by John Wiley & Sons, Inc., 440 Fourth Ave., New York 16, N.Y. Vol. II, Full supply of new Cannon literature 384 pages, price $8.50. This volume blends New herrnetics Factory engineers available the practical and theoretical information to needed by the designer and branches off into help you with your problems more advanced material.

s Note these Cannon Booth numbers NOW! Properties of booth nos. and. 1018 Large Slot Antennas miniatures- 1011 Published by Office of Nasal Research, order connect with PB 111523, OTS, Dept. of Commerce, Wash- ington, D. C. Price 25 cents. This study describes an investigation into the field configuration existing in slots cut in the broad CANNON side of a standard 1" x 0.5" X -band New unit plug -ins tease- world's largest exclusive guide. connector manufacturer at WESCON Basic Vacuum Tubes And Their Uses New XLR's 3209 H maboldtaSSt. LOS ANGELES Rider and Henry Pub- By lished by John F. der Publisher,, Inc., 480 "Seven Plants Around the Seven Sens" Canal St., New York 73, N.Y. 208 pages. Price $3.00 paper bound, $4.50 cloth bound. Well illustrated with comprehensive line New hermetic sealed dc - 1, drawings, charts, curves, etc., this book con- solenoids CQ.wno tains chapters on electrons & electron emis- sions, triodes, and multielectrode Get Cannon's external tube. house organ, the Cannonade, at home or work ...six times a year, Summary of Joint Nomenclature New printed circuit without charge. Each issue connectors eight pages of technical System ( "AN" System) for articles covering new materials, new connector Communications Electronic designs, new applications. Equipment Keep up -to -date. Write today A 2.page fold issued by the Joint Communica- Please refer tions-Electronics Committee. Order PB 111- 201 581 from OTS U.S. Dept. of Commerce, manometer connectors ; ill Dept.... Washington, D.C. Price 25 cents. A useful chart that summarizes a coordinated system of nomenclature for communications.

For product information, use inquiry 66 cord on last page, TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com 111,1/I,IN'i' 1ORKRITE TUBING in foreground, enlarged`` " to show detail

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For product information, use inquiry card on last page. 67 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com what's new in vitamin Q®

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On Conventions and Shows

This month, August 24 -26, WESCON holds its fifth annual show and convention in San Francisco, Calif. The phenomenal growth of this event over these last few years (22,396 registrations in 1954) leaves little doubt that WESCON has now become one of the important annual functions for the electronic industries. To the co- sponsors of this event, WCEMA (West Coast Electrical Manufacturers Association) and IRE (Institute of Radio Engineers -7th Region) our congratulations for a job well done and best wishes for even bigger (but we doubt better) conventions in the future. WESCON and the present IRE National Convention are regional events that serve the basic needs of the industry. One additional regional event ... in the midwest .. . would be most desirable.

Too Many Shows? Our suggestion for another show and convention may seem somewhat incongruous because from time to time industry executives have voiced the opinion that there are too many shows and conventions taking place during the year now ... that many of these events are a costly drain of company funds for sometimes very questionable returns. In some instances, organizations have been known to enter an exhibit at a show, not because they wanted to, but because they feared becoming conspicious by their absence. Then there is the constant upheaval in every -day business routine occasioned by the delegates or those assigned leaving to attend the event. Conventions and shows have long been recognized as being very necessary. The personal contacts made at these events and the interchange of technical information is lifeblood to our electronic industries. But too much is not good either and we are inclined to agree with those gentlemen who say that we have too much now! Regional Shows We checked the 1955 Roster of Associations Serving the Electronic In- dustries (Tele -Tech April 1955) and found that of the 62 associations listed, 48 had conventions or major annual events. Of this number, 20 listed themselves as having both conventions and exhibits. Note too that these figures do not include the annual functions of the professional groups in the Insti- tute of Radio Engineers. There are 23 such professional groups listed and we can be sure that each will seek, if it does not now have, a major annual event of its own. And then, of course, the end of the number of professional groups is still not in sight. Three regional shows and conventions each year, eastern, mid -western, and western would, we feel, render a maximum service to the electronic industries and offer plenty of conventioning for all! We believe that many readers feel as we do and your comments on this topic are cordially invited. In future issues we will print views and feelings of our readers in this connection.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 69 www.americanradiohistory.com 16a0H FIEW6NCY- -vrac HIGH F couENCr IVH21 RADARSCOPE 3 fHrl 30

.I ` W - W _ FM TV c ó. s CC Revealing O. cH,ume important developments and trends GOVERNMENT V á u - ó it 47 r throughout the 1 - t t 101117 II spectrum for radio, TV and óF rc> O > O electronic a research, manufacturing and operation !! MEDICAL i Fr SCIENTIFIC 21 iF Ib Ot 7116 18 106 I 1 IÌSB 161 1 220 s I 11,2 1115

ELECTRONIC INDUSTRIES IMPORTANCE in the RETMA INTERNATIONAL DEPT. is currently work- Nation's defense was underlined recently by Frank D. ing with the Dept. of States to arrange for a program Newbury, Asst. Secretary of Defense. He points out whereby members traveling abroad will receive all that the Department of Defense buys almost one -half possible assistance through Embassies and Consulates. of all electronic equipment now produced. He estimates dollar volume of the electronic industries at $9 billion AIRCRAFT NOISE has been recognized by the Air for 1955 and to rise to $20 billion in another ten years. Force as a national problem in scope. 120 officers have been attending a special class at MIT studying "Noise MICA FABRICATORS ASSOC. reports that Congress- Problems in Aircraft." They are to "pass -on" informa- man Frank M. Karsten has introduced HR -6299 which tion at home bases. would reduce the duty on unmanufactured block mica to 40 per pound regardless of value and would put on the free list uncut mica condenser films and splittings STATUS OF EDUCATIONAL TV in the United States regardless of thickness. Anyone interested in passage of will be surveyed the Educational Television & Radio this bill should write and so inform their own congress- Center, Ann Arbor, Mich. during the 1955 -56 academic man. year. This detailed appraisal was made possible by a grant from the Fund for Adult Education. Richard B. Hull, Radio -TV Director of Iowa State College has been SOLAR BATTERY named director of the project. During the course of the year, Hull will gather first -hand information on the operations of all ETV stations now on the air and those scheduled to begin broadcasting in the near future. He will also meet with leading educational and civic authorities in an effort to appraise the successes, failures and potentialities of the medium to the field of education.

CERMETS to find important new industrial applications. This was a keynote in Dr. Paul Schwarzkopf's opening address at the recent International Assembly of Powder Metallurgists in Ruette, Tyrol, Austria. Cermets are composite materials consisting of two components, one being either an oxide, carbide or boride or similar inorganic compound, and the other a metallic binder. They originated as a result of a government- industry program for the development of high temperature materials using the techniques of powder metallurgy. New cermet materials (bordies) feature excellent corrosion resistance at high temperatures.

STANDARDS NEW RETMA STANDARDS of interest to the electronic industries include: REC- 145 -Packaging Tests for Television Receivers; TR -119A-Minimum standards for Land -Mobile Communication PM or FM Receivers;

Bell Telephone Labs engineer, W. D. Gerdsen, with a model of the Bell TR- 139 -Audio Transmitter Input Impedances; ET- Solar battery mounted on a section of telephone pole. The solar battery 106-C- Gauges for Electron Tube bases. A standards is receiving its first practical test as part of the telephone system this summer in an experimental unit -essentially identical to the model proposal is now being circulated on the subject "High shown -installed in Americus, Ga., to supply power to terminal equip- Voltage Ceramic Dielectric Capacitors Class 2, above ment on rural telephone lines. During daylight hours the battery will 7500 Volt Rating. The RETMA Engineering Department power terminal equipment directly, and at the same time charge a storage battery to provide power for nighttime operation. is now located at 11 West 42 Street, New York 17, N.Y.

70 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com venu wert MEOUENCr N9117 NIC79 7AEe . NEONBELT MVO GOVERNMENT GOVERNMENT á- i ` UHF Z AMATEUR, = z '¢Z 0... 4 TV Wiá MOBILE, Zá á0áZ - INDUSTRIAL, á z 70 CHANNELS r 9 FÓz WÓ .> - GOVERNMENT,, W Q F O z Ç OaO» ó RO -NAVIGATIO N, Q z0 RADAR F 41516 17 l01 z M 81 8787 ;z °oE u

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TRANSISTORS 33/4 psi. As is widely known, moving tape oscillates, and also has different tensions near the beginning and end COMMERCIAL APPLICATION of transistors in home of the reel, causing a continuously changing series of receiver and entertainment products appears to be mov- small, yet critical, misalignments. The new development ing forward at an ever increasing pace. Several manu- has the head azimuth adjusted by a piezoelectric crystal facturers have already announced completely tran- fed by a correction voltage. This voltage, which is a sistorized portable radio designs. Philco is making a measure of the alignment, is derived from either a bi- portable phonograph in which three transistors are used. naural head which detects tape misalignment, or from RCA uses a transistor in a high fidelity design as a the high frequency component on the tape, whose out- phono -pickup preamplifier. A western transistor manu- put is a function of alignment. facturer is circulating a printed portable receiver chassis design that uses four transistors to set makers as engineering samples. Costs of transistors are also declin- UNDERWATER SOUND ing and becoming more comparable to receiving tube SONAR and other types of sonic gear used for under- costs. For a four transistor portable design, the tran- water exploration have been severly limited in their sistors can be provided for about $7.50. applications by the "phantom layers" of reflective material that are found at depths of 500 to 1500 ft. through- INDUSTRY PRODUCTION out the ocean. The most prominent theory holds that these layers are composed of millions of marine or- PRODUCTION OF ELECTRONIC products in 1955 is ganisms. Experimentation with different sound frequen- expected to reach $6.2 billion, just a shade under the 1953 cies and underwater cameras is being undertaken to record $6.3 last $5.8 billion, of billion but above year's clear up the mystery. a forecast for the last half of this year by the Electronics Division of the Department of Commerce's Business & Defense Administration stated. Television STRENGTHENING OUR DEFENSES receiver production bulks large in this year's manufacturing operations with a total value of factory pro-. duction for 1955 estimated to exceed $1 billion, but the BSDA division pointed out that production of color television sets is not expected to become a major factor in the total output of TV receivers. Color TV receiver sales for this year with increased demand in the fall will reach an estimated $15 million, but 1956 will provide a substantial increase in production. In the first half of 1955 the number of black and white TV receivers was at a near record level -33/4 million units, and the BSDA noted that the average unit price declined because savings from improved production techniques have been passed on to the consumer. Production of radio receivers continues at a high level for the rest of this year. Military equipment such as radar, sonar and guided missile electronic systems, together with tubes and other components, formed major segments of the industry's total production, BSDA cited.

MAGNETIC RECORDING RADICALLY NEW PIONEER INVENTION of an automatically self -aligning magnetic playback head will be revealed in the near future by Julius Konins of The Dubbings Sales Corp. It will reportedly increase the Radar technicians of the Royal Canadian Air Force, all veterans of serv- operating efficiency and accuracy of tape recording ice in northern radar "fence" installations, receive instruction in erection operations employed in computers and telemetering and operation of powerful U.S. Air Force MPS -14 mobile height finder systems, and may eventually be a contributing factor radar, at Syracuse, N.Y. General Electric plant. The Canadians are studying types of G -E radars used by U.S. forces and now purchased by the in the development of high quality audio recording at Canadian government through U.S. Air Force.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 71 www.americanradiohistory.com THE 1955 Western Electronic Show and Convention will be San Francisco conclave officially opened on Aug. 24th in San will feature more than Francisco with a send-off, via a coast - 580 exhibits, and the presentation of 160 tech- to- coast TV link, from Gen. Douglas nical papers. Attendance of 20,000 expected MacArthur in N. Y. The 3 -day fes- tivities that will follow are expected Technical "An Experimental Automobile Receiver Em- Papers Program ploying Transistors," by L. A. Freedman, to attract some 20,000 of the nation's T. O. Stanley and D. D. Holmes scientists, engineers industry SOLID STATE DEVICES "High- Efficiency, Unipotential Post Focus, and 'fri -Color Picture Tube," by Wilfrid F. representatives. "Transistors Today." by J. A. Morton Niklas "Large Signal Semi- Conductor Devices," by The Show itself will consist of John Saoy TRANSISTORS AND BLOCKING "High- Frequency Power Gain of Junction OSCILLATORS more than 580 exhibits, representing Transistors," by R. L. Pritchard the products 650 "Recent Developments in Germanium Alloy "Advantages of Direct Coupled Transistor of more than manu- Junctions," by C. W. Mueller Amplifiers," by Richard Hurley facturers. "A New High -Ambient Transistor." by R. R. "Junction Transistor Blocking Oscillators," Rutherford and J. J. Bowe by J. G. Linville Convention activities will feature "The Design of Blocking Oscillators as Fast INFORMATION THEORY Pulse Regenerators," by F. K. Bowers a technical program consisting of 160 "Stability of Multi -Mode Oscillating Sys- papers and 32 technical sessions, an "Limiting Frequency -Modulation Spectra," tems," by R. W. De Grasse by N. Blechman "Experiments with Radio Controlled, Dy- All- Industry Luncheon, at which Dr. "The Definition of a General Metric of In- namically Similar Models," by E. G. Stout E. formation," by N. Abramson "Role of Electronics in Engineering Flight W. Engstrom of RCA will be the "An Analysis of Optimum Sequential Detec- 'resting," by W. L. Howland principal speaker, and an ambitious tors; by J. J. Bussgang and D. Middleton "Instrumentation for Rocket Engine Test- "Analysis of Automatic Bias Control ror ing," by R. F. Gompertz program of field trips and activities Threshold Detectors," by E. Ackerlind "Generating a Gaussian Sample," by S. Stein ANTENNAS I for the distaff side. and J. E. Storer WESCON (Western Electronic "Proof of the Sampling Theorem for Sta- "Recent Developments in Microwave Anten- tionary Processes," by A. Rosenbloom and nas," by L. C. Van Atta Show and Convention) which is held "Printed Surface Wave Antennas," by H. W. J. Heilfron Cooper in alternate years in Los Angeles and "Circularly -Polarized Slot Radiators," by RELIABILITY AND QUALITY CONTROL A. J. Simmons San Francisco, is sponsored by the "Engineering and Testing for Reliability," "Radiation from Ferrite- Loaded Slot Radi- West Coast Electronic Manufactur- by H. G. Romig ators," by D. J. Angelakos and M. Korman "Parts Versus Systems: The Reliability Di- Korman ers Assoc. (WCEMA) and the San lemma," by David A. Hill "A Large Aperture Differential Polarization "An Effective Reliability Program Based Antenna for Radio Astronomy Use," by Francisco and Los Angeles Sections, Upon 'A Triad for Design Reliability',' by V. H. Goerke and O. D. Remmler representing the 7th Region, Insti- F. E. Dreste "A Basic Study of the Effects of Operating INSTRUMENTATION tute of Radio Engineers. NEDA, "The and Environmental Factors on Electron Tube Reliability," by W. S. Bowie "Beamplexer-High Speed Channel Multiplex- Reps," and other industry groups "Surface Contamination of Dielectric Ma- H. and S. Kuchinskyis ":4 Stable, ,DDiode y CosChopper Circuit, by H. lend their active support. terials," by Saul Chaikin Patton Field trips have been arranged "A Completely Automatic Impedance Plot- PROPAGATION ter," by J. R. Vinding this year to Beckman Instruments "An Explanation of Fading in Microwave "A Broadband Microwave Frequency Meter," Relay Systems," by H. Magnuski by P. H. Vartanian and J. L. Melchor plant, the Radiation Lab. of the "Some Notes on Propagation over a Spher- "An Expanded Scale Frequency Meter," by Univ. of Calif., the tube plant and ical Earth," by S. J. Pricker Duane Marshall "Radio Power Received via Tropospheric "Measurement of Time Varying Frequen- facilities of Eitel- McCullough, Am- Scattering," by A. Waterman cies," by Martin Graham "Atmospheric Attenuation of Microwave pex, Stanford Research Inst. and the Radiation." by G. R. Marner ELECTRONIC COMPONENT PARTS Hewlett- Packard plant. "Theory of Deviative Absorption in the F2 Layer and Its Relation to Temperature," "Design and Properties of High Voltage Special airline accommodations by R. Gallet Glass Capacitors," by G. P. Smith "Characteristics of Modular Electronic Com- have been arranged for with United BROADCAST AND TV RECEIVERS ponents," by W. G. James "Simple Electronic Transformer Design," by Airlines. Mainliner flights are being "A Thin Cathode Ray Tube," by William R. R. Lee arranged for WESCON visitors and Aiken "Measurement of Parameters Controlling "Beam Focusing and Deflection in the Aiken Pulse Front Response of Transformers," by exhibitors from major cities to San Tube," by R. Madey P. R. Gillette, K. Oshima and R. M. Rowe "Radiation Measurements at VHF and UHF," "Development of MIL- T -27 -A: Transformers Francisco. by A. B. Glenn and Reactors," by E. M. Wiler

72 TELE -TECH & ELECTRONIC INDUSTRIES August 1955

www.americanradiohistory.com HIGH POWER TUBES "Experimental Results of Conductive Cool- "M -Type Backward Wave Oscillators," by ing Tests on Airborne Equipment," by J. Hull R. L. Berner "Considerations of Various Structures for High Average Powers in the UHF Region," COMPUTERS II- ANALOGUE COMPUTER by D. Preist COMPONENTS AND APPLICATIONS "Design Information on Large Signal Trav- "Automatic Data Accumulation System for eling -Wave Amplifiers," by J. E. Rowe Wind Tunnels," by John Wedel "A New Beam Power Tube for UHF Serv- "Data Recorder for Evaluation of a Fire ice," by W. B. Bennett Control System," by J. T. Ator and L. P. "An Ion Trapped High Voltage Pentode," by Retzinger, Jr, R. E. Hellers "Transistors in Current Analog Computing:" by B. P. Kerfoot AUTOMATIC CONTROL "The Use of Electronic Analog Computers "Non- Linear Compensation of an Aircraft in the Solution of Certain Radar Noise Instrument Servo -mechanism," by D. Le- Problems," by J. A. Aseltine bell "Precision Electronic Switching with Feed- "The Stabilization of Non-Linear Servo- back Amplifiers," by C. M. Edwards mechanisms Encountered in Antenna In- CIRCUIT THEORY II -SYNTHESIS strumentation," by J. Bacon Noel Porter Walter E. Noller "Synthesis of a Non PROBLEMS -Linear Control System," WESCON Chairman Secy.-Treas. by I. Flugge -Lotz and C. F. Taylor "New Methods of Transformerless Driving - "Theory of Non -Linear Feedback Systems Point Impedance Synthesis," by Stanley Having a Multiple Number of First -Order Hurst Operating Points," by J. A. Narud "General Synthesis of Quarter -Wave Im- "Noise in Non -Linear Servos," by G. O. pedance Transformers with Given Inser- Young and C. J. Savant tion Loss Function." by Henry J. Riblet "The Approximation Problem in the Syn- TELEMETRY AND REMOTE CONTROL thesis of R -C Networks," by K. L. Su and "Wow and Flutter Compensation in FM B. J. Dasher Telemetry: by W. H. Chester "A Precise Method of Designing High -and- "Aliasing Errors in Sampled Data Systems," Low -Pass R -C Filters with Active Ele- by A. J. Mallinckrodt ments." by M. McWhorter "Air -to- Ground Propagation over Desert "Signal Flow Graphs for Random Signals," Terrain at Telemetering Frequencies," by by W. H. Huggins G. L. McCone "Pulse Width Data Multiplexing of an FM/ MEDICAL ELECTRONICS FM Subcarrier," by A. S. Westnest "Recent Developments in Color- Translating "The Use of A -C Excited Gauges in a PDM/ Ultra- Violet Microscopy," by R. B. Holt PM Telemetering System," by W. F. Car- "Some Theoretical and Practical Aspects of mody Microscanning," by W. E. Toilers, et. al. MICROWAVE THEORY "The Electrocardionhone-A New Surgical Tool," by A. J. Morris and J. P. Swanson "Periodic Structures for Traveling-Wave Donald B. Harris Norman H. Moore Tubes." by M. Chodorow "Instrumentation for Spectral Phonocardiog- "Conversion of Maxwell's Equations into raphy," by George N. Webb Vice -Chairman Vice- Chairman Generalized Telegraphist's Equations," by S. A. Schelkunoff ELECTRON TUBES "On the Expansion of Fields in Lossless "A UHF Traveling -Wave Amplifier Tube Microwave Junctions," by T. Teichmann Employing an Electrostatically Focused "Conformal Mapping of Rounded Polygons Hollow Beam," by C. B. Crumly by a Wave- Filter Analogue," by H. A. "Design of Solenoids for Traveling -Wave Wheeler Tubes," by J. E. Etter, A. W. Friend and W. Watson BROADCAST TRANSMISSION SYSTEMS "Light Weight Solenoids of Aluminum Foil." W. A. "The Perfect Television System," by O. H. by G. Worcester and L. Weitzmann Schade "The Serrodyne -A Single Sideband Syn- "The Subjective Sharpness of Simulated chrodyne." by R. C. Cumming Color TV Pictures." by H. F. Huntsman "Recent Dark Trace Tube Developments," "The Conversion of a Standard TV Mobile by S. Nozick Unit for Greater Flexibility and Operating "Recent Developments in the Use of ris- Convenience," by H. F. Huntsman nenser Cathodes in Low and Medium "High Speed Duplication of Magnetic Tape Power Magnetrons," by R. S. Briggs Recordings: by J. M. Leslie "Color TV Magnetic Tape Recording Sys- MICROWAVE TECHNIQUES tem," by H. F. Olson "Waveguides for Long Distance Communica- A. tion." by C. Beck W. D. Hershberger P. COMPUTERS -DIGITAL COMPUTER "Recent Advances in Microwave Filter Tech- Thos. Walker APPLICATIONS AND DESIGN niques." by Seymour Cohn Member Member TECHNIQUES "Geometrical Methods for the Analysis of Two -Part Networks," by G. A. Deschamps "A Punched Card Method of Evaluating "Some Applications and Characteristics of Systems of Boolean Functions with Spe- Ferrite at Wavelengths of 0.87 and 1.9 cial Reference to Analysis of Relay Cir- rms.," by Clyde Stewart cuits," by W. R. Abbott "Measurement and Control of Microwave "The Elecom 50-A New Type of Computer." Freauencies by Lower Radio Frequencies." by Evelyn Berezin and Phyllis Hersh by R. C. Mackey et al. "Logical Design of the Remington Rand High Speed Printer with Emphasis on the ANTENNAS II Checking and Editing Features," by M. Jacoby "Radiation Characteristics with Power Gains "Theory, Principles and Applications of for Slots on a Sphere." by Y. Mushiake Statistical Computers," by H. Blasbalg and and R. E. Webster W. O'Hare "Radiation Patterns of Asymmetrically Fed "A Glow Transfer Shifting Register Utilizing Prolate Spheroidal Antennas," by H. A. R -F Gas Discharge," by D. C. Engelbart Myers "Ferroelectric Hysteresis in Barium Titanate "Phase Pronerties of Antennas for the Single Crystals," by H. H. Wieder Dovap Millile Tracking System," by T. Morita and C. W. Steele ENGINEERING MANAGEMENT "Rotationally Symmetric Dielectric Miern- wave Lenses with Two -Dimensional Wide "Small Engineering Company Organization Angle Scanning Characteristics," by A. C. Frederick Wolcott Leon B. Ungar a Philosophy and Method," by - Mayer and E. Wantuch Member Member Jarmie T. W. "Is the Yardstick for Estimating Individual RADIO RELAY SYSTEMS DESIGN Engineering and Scientific Potential Re- liable?" by A. H. Schooley "Design of FM Radio Relay Equipment for "Management in Production Engineering," Multi -Channel Operation." by J. W. Retina by C. Blahna "Factors Affecting the Spacing of Radio Terminal in an UHF Link." by I. H. Gerks "Market Development -The Neglected Com- "Radio panion of Product Development," by A. Communication with Secondary Ehrenfried D. Power." by H. E. Hollmann "Cross Functional Engineering Manage- "Single Sideband Multiplexing as it Applies ment." by C. M. Ryerson to Microwave Relays," by T. L. Leming II. THE INTERNATIONAL GEOPHYSICAL AERONAUTICAL AND NAVIGATIONAL YEAR PROGRAM ELECTRONICS "The International Geophysical Year, 1957- "An Improved Simultaneous Phase Com- 1958" by R. J. Slutz parison Guidance Radar," by H. H. "Absorption Measurements During the In- Sommer ternational Geophysical Year," by Gordon "Antenna Design Considerations for Heli- Little copters." by J. B. Chown "Vertical Incidence Ionosphere Sounding "High Voltage Impulse Generation for Meas- Measurements during I.G.Y.," by J. M. urement of Receiver Susceptibility to In- Watts terference Encountered in Aircraft," by "Bark- Scattering Measurements During Mal Mobley, Jr. Jeanne W. Jarrett A. Newman and J. R. Stahmann I.G.Y.," by A. M. Peterson Bus. Mgr. Recording Secy.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 73 www.americanradiohistory.com e, el i e2 Ri

RL s

rm. acrc - ( -cc)rb Fg. 2: External emitter resistance added OSCHEMATIC OEQUIVALENT

By RICHARD B. HURLEY Fig. 1: Basic circuit of transistor amplifier with equivalent circuit Predictable Design Of Transistor Amplifiers

Problems associated with the predictable and stable design affect the bias levels of the transistor.3 Thus Ie, will create indirect of transistor amplifiers, with attention focused on the common - temperature variations in param- emitter, junction transistor as a low- frequency amplifier eters due to its variations with temperature and its effects, in turn, upon emitter current and col- The design of a exact characteristics of the main de- lector voltage. Also, 'co varies from system or circuit vices are relatively unimportant to transistor -to- transistor even more is often compli- the overall system performance. For strongly than do the small - signal cated by the lack example, the characteristics of an parameters. It also is probably the of precise knowl- active device may be submerged by characteristic most prone to vary edge of the char- the use of degenerative feedback, with time, creating an aging prob- acteristics of de- circuit configurations, and linear sta- lem. vices employed. bilizing techniques. Other pertinent considerations that Further complica- Currently available transistors fall must be given by the designer in- tions result if the into the category of principal circuit clude medium and large signal as- characteristics of devices whose parameters are sub- pects of performance. If, say an input the devices used ject to many severe variation.' Here voltage is to be amplified by a tran- R. B. Hurley vary with time or the designer must account for the sistor, the approximately exponen- under changing environmental con- following deviations of the small- tial relationship of resulting transis- ditions. Thus, in order to obtain ini- signal parameters from their nominal tor currents to applied input voltage tial desirable and predictable per- values: must be dealt with.4 Also large -sig- formance with such devices, the de- 1. Variations from one transistor nal distortion and clipping must be signer may be required to resort to to another of the order of as much properly evaluated, suppressed, or the selection of particular samples as 50% or more in critical param- avoided. or the experimental tailoring of each eters. The case to be treated here is that circuit to accommodate the particu- 2. Variations with changes in of the low- frequency junction -tran- lar device used. To allow for aging emitter current as strongly as an in- sistor amplifier in common- emitter effects, he may have to incorporate verse law. orientation. While this may appear adjustable components within the 3. Variations with changes in col- to be a rather restricted case, it does circuit. Furthermore, non -linear lector voltage to as much as a %- represent the most popular type compensating elements may be re- power law. transistor, orientation, and applica- quired to automatically adjust for 4. Variations directly with tem- tion. Furthermore, the biasing tech- environmental effects upon the char- perature to a linear or even an ex- niques to be discussed are indepen- acteristics of the principal circuit de- ponential degree. dent of the orientation, and both the vices. An alternate design philoso- In addition to the above deviations, biasing and signal techniques are to phy that is sometimes practicable is the designer must recognize that the a large extent transferable to other to design the circuit such that the reverse collector -base diode current types of circuit applications. Fortu- (Ico) varies approximately exponen- nately, many of the better quality

RICHARD B. HURLEY, Senior Research Engr., tially with temperature (doubles junction transistors are capable of 1000 Advanced Development, Convair, Pomona, Calif. every 10 to 20° C.).2 Ia° will, through voltage gains of the order of its interaction in external circuitry, and power gains of the order of 10,-

74 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com gain or current gain may be of importance. Therefore it is necessary + to consider some additional signal Vc f function of an amplifier. Again referring to Fig. 1, the input resistance Rcc Rcc is' r,+RL + Ecc . +Ecc I re+rb R, = rb + r, [ (4) SELF- BIASING © BASE- INJECTION _ a) + re +R` I L(1 re+rbJ For f- rb <

OC EMITTER- INJECTION OSPLIT- EMITTER If an appropriate external emitter resistance is employed for voltage Rac=Ra+R5 gain fixing, RI Ra RBe R2 re«R1,<

rameter variation problem but ance, RE, is inserted between the 1 equipped with "gain to spare," the emitter terminal and ground (Fig. 2) R = R for R, < < Rt. (7) alternate design philosophy of sub- and if RE is much larger than the 1 1 merging the importance of the exact denominator of Eq. 2, the voltage R,+ R, device characteristics will be pur- gain becomes sued. A method has been presented for Consider the simple amplifier of e_ R,, -R,. making the low- frequency small - - - a--+ -,fora - 1.0. (3) signal transfer characteristics of a Fig. 1. The voltage gain of such an e, R,; RE amplifier is' transistor amplifier reasonably inde- The limiting form of Eq. 3 shows the pendent of the characteristics of the re+rb voltage gain to be independent of the transistor itself. It will be noted that a- transistor characteristics. The suc- the use of an external emitter resist- ez -R,. r,+rb by the -_ (I) cess of the method is dependent upon ance was essentially dictated sizes of transistor et r,+rb (1 - a) + r,+rb R,, obtaining transistors with consis- normal relative re+rb tently small values for re and r,,, parameters and by the form of the large values for re, and a's very near transistor equations. It should also unity. Through the quality control be noted that RE creates degenera- Properly designed junction transis- efforts and selective procedures of tive current feedback. Thus RE also tors are generally such that manufacturers, such transistors are yields a first -order solution to the readily available. RE must generally large -signal distortion problem by rb < r be made large enough and RL small tending to suppress the harmonics re <

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 75 www.americanradiohistory.com Instrumentation for

In the engineering and production of aircraft engines, electronic and allied measuring instruments play a vital role. This chart shows the various instruments and the quantities they measure in a typical jet engine and a typical reciprocating engine with power recovery turbines such as the Curtiss - Wright Turbo Compound engine.

JET ENGINE

Instrument Function Measured Range A. Thermocouple, null balance indicator Front bearing temperature 150 °F B. Potentiometer, null balance indicator and counter Throttle position C. Thermocouples, null balance indicators, recorder strip charts Compressor oil temperature 200 °F Compressor air temperature over 500 °F D. Thermocouples, null balance indicators Center and rear bearing temperatures over 150`F E. Thermocouple, null balance indicator Exhaust cone temperature Over 1200 °F* F. Thermocouple, direct- writing oscillograph Metal liner temperature Over 1200 °F G. Thermocouples, direct writing oscillographs Metal skin temperature Over 400 °F H. Borden tube Fuel pressure and oil pressure 50 to 60 lbs. I. Platform and load cell, null balance indicator Engine thrust Over 7220 lbs. J. Frequency type electronic flowmeter Fuel flow K. Rotating coil, tachometer pulse generator and EPUT meter Main shaft speed Over 6000 rpm L. Thermometer and barometer Input air temperature and atmospheric pressure Ambient conditions M. Pressure drop nozzle Air flow input (Classified)

"After burner temperature, and variable nozzle position measured by po'entiometer and null balance indicator, are classified. o

I FRONT MAIN BEARING SECTION 2 COMPRESSOR SECTION O 3 CENTER MAIN BEARING SECTION 4 COMBUSTION SECTION O 5 REAR MAIN BEARING, TURBINE AND EXHAUST SECTION

Photo courtesy Curtiss- Wright Corp., Wood- Ridge, N. J.

76 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Aircraft Engines

CURTIS -WRIGHT TURBO COMPOUND ENGINE

Instrument Function Measured Range A. Pressure -torque meter Horsepower measurement 250 psi B. Thermocouples, null balance indicators Cylinder temperature to 600 °F C. CRT, detonation detector -analyzer Cylinder ignition and detonation firing se- quence and waveform D. Velocity pickup, oscillograph Engine vibration Several mils at a few hundred cps E. Electrical tachometer "Booster" turbine speed 17,000 rpm F. Thermocouple, null balance indicator Turbine temperature G. Manometer Manifold pressure 0 -80" Hq absolute H. Orifice nozzle Air flow 40,000 lbs./hr. I. Thermocouple, null balance indicator Air temperature Ambient J. Barometer Air pressure Atmospheric K. Electrical tachometer -counter Shaft speed 150 to 3000 rpm L. Borden tube Oil pressure 75 lbs. /in.2 M. Rotometer Fuel flow to 2600 lbs. /hr. N. Velocity pickup, oscillograph Er.gine vibration Severals mils at a few hundred cycles O. Bonded strain gages Crankshaft stress P. Electrical dynamometer Propeller shaft power 3250 to 3700 hp

Photo courtesy Curtiss- Wright Corp., Wood- Ridge, N. J.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 77 www.americanradiohistory.com Criteria

1111111111111111 By NORMAN W. GAW; JR. and DAVID SILVERMAN

//n. :¡'. ïï! / ¡ / iiti'iiii';';:};IN1N,b,.. %ra(crccaaÍCrcÍgoqra ...... -- dom from distortion. However, since all circuit elements have performance limitations, this is not possible. distributed parameter delay line insulation The best of delay lines, properly applied, must necessarily suffer from distortions due to (1) deterioration of rise -time and (2) loss of amplitude. t111 1111 The upper part of Fig. 2 shows an ideal pulse (dotted lines) applied to such a line, and the resultant stored signal. In comparing these two curves, note: il 1. The increase in rise -time. 2. The decrease of amplitude. Shortcomings in design and misap- plication could lead to other distor- ittmcwo tions. If many should appear at once, an extreme degradation of signal would result, as shown in the lower part of Fig. 2. In spite of the complex disfiguration, a trained observer condenser could easily distinguish the contri- bution made by each basic distortion lumped parameter delay line illustrated in Fig. 3: Phase distortion: Characterized in the (a) Underequalized state by a leading ring. Fig. 1: The two basic types of electromagnetic delay lines (b) Overequalized state by a lagging ring. Both suffer rounding of pulse lead- HE electromagnetic delay line all electromagnetic delay lines are of ing -edge. Underequalization refers T should be thought of as a T or two general types, as illustrated in to a decrease of delay at the higher time - storage component which might Fig. 1. In the distributed or coaxial frequencies. Too much delay -com- be applied in the same manner as a type of line, the geometry of the two pensation results in overequaliza- simple R, L, or C component. Yet, conductors is arranged to take opti- tion. unless properly understood, it could mum advantage of the delay charac- Input-output coupling: Character- appear to be complex and difficult teristics of a transmission line. In ized by distortions occurring at one to apply. The increased application the lumped line, discrete reactive delay time preceding and one delay of many new delay -line types has elements are arranged in the form of time lagging the pulse rise. These caused a measure of confusion among a multiple- section filter. are due to intercoupling of the users and manufacturers. The intent Two separate approaches to delay - higher- frequency portions of both of this article is to contribute a com- line design have been taken; the first applied and delayed signals. mon understanding by analysis of derived from transmission -line and Discontinuity: Characterized by distortions, definitions of terminol- the other from filter theory. Yet it waveshape irregularities occurring ogy, and description of test methods. can be shown that the properties of a within two delay periods after the It is hoped that this might instigate distributed line are approached as pulse rise. These are due to non - the formation of standards for elec- the number of sections of a lumped uniformities in the construction of tromagnetic delay lines. line is increased. Kimbarkl has the line. Delay lines are available in a wide shown that a transmission line pre- Mismatch: Characterized by an variety of shapes and sizes. How- sents a limit case of filter theory. abrupt change in step level occur- ever, in spite of apparent differences, Therefore, by equivalence, all delay ring two delay periods after pulse lines may be similarly evaluated and rise. This effect is due to incorrect NORMAN W. GAW, 1R., project engineer, and tested. termination. The curves indicate the DAVID SILVERMAN, Eastern Plant Research Di- The ultimate in design is to accom- separate effects which are due to re- rector, Helipot Corp., South Pasadena, Calif. plish time delay with complete free- sistive and reactive mismatch.

78 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com for Electromagnetic Delay Lines

Designed to provide users and manufacturers of delay lines with

a common basis of understanding, this article defines terminology, pale «;erh and describes test procedures for pulse and sinusoidal testing 9 C;1 worieuNawilm.imma==smalworsTrus The manufacturer strives to mini- (h) Rise -time is the time in which mize all distortions, but is often re- a unit step changes from its initial quired to compromise certain quali- to its final amplitude level; meas- ties to effect savings in size and /or ured from the 10% to 90%a points cost. As with any other component, (see figure 2). ..-inemea5 the manufacturer's specifications in- liii!..-rwsp«rr (i) Bandwidth is the band of fre- dicate the extent of it such compro- quencies which a delay line at- mise. tenuates uniformly or within 3 Fig. 2: Distortions common to al delay lines decibels of equality. (top) and extreme distortions (bottom) Terminology (j) Insertion loss' is the inverse ratio of: the power received by a re- In order to evaluate fully such spe- ceiving circuit directly connected cifications, the language must be un- to power; derstood. a source of to: the Certain terminology is power by the same circuit most often used throughout the in- received dustry: when an additional 4- terminal network is inserted between it and (a) Time delay is the time in which the source.' an electrical signal is stored by a system or component. Pulse delay (k) Characteristic impedance' is (1) is measured at the half -amplitude the input impedance of a line of point of the leading edge of the infinite length, or (2) the input input and output pulses: impedance of a finite line terminated in an impedance of such T = VLC where: T = total delay value as to make the input im- L = total induc- pedance equal to the termination tance impedance: C = total capacitance Z = I C where: (b) Phase shift is a measure of delay = characteristic impedance at a given frequency: L = inductance /unit length C = capacity /unit length

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 79 www.americanradiohistory.com this type with their delay lines. From Delay Lines (Continued) these photographs, delay time can be obtained by comparison with a 1. Proper impedance matching. up: A high- quality pulse or a known frequency of the timing 2. Decrease of loading effect, re- square- wave -generator output is marker. Input and output rise -time sistive and reactive, particularly coupled through an impedance - may similarly be measured. Delay in a variable or tapped delay line. matching network to the input of a line rise -time may then be obtained 3. Isolation and decoupling between delay line. A suitable high- frequency by use of the following equation: those portions of the test setup oscillograph may be used to observe which, because of the delay line, the pulse waveshape, providing the Tr delay line = are not in phase. amplifier (or deflection plates) into \/(Tr2 a a,) - (Tr2 input) Either pulse or sinusoidal testing which the signal is fed has relatively may be used to supply comprehen- low input- capacitance and high in- where: Tr = rise -time sive test information, with each of- put- impedance. fering particular advantages: Reflections will distort the input - By comparison of the amplitudes of 1. Pulse techniques are most often pulse shape if the delay line is not the input and output pulses, the at- used to determine rise -time, pulse properly matched. By adjustment of tenuation is obtained as follows: delay, distortion, pulse attenua- termination to minimize this reflec- Vin Vont tion, and characteristic impedance. tion, the characteristic impedance Attenuation - - 2. Sinusoidal techniques will more may be determined and measured. Vin readily yield bandwidth and phase Fig. 4 illustrates how, by multiple response. Greater accuracy may exposure on a single print, the fol- where: VI. = Input -pulse ampli- be achieved in the measurement lowing is recorded: tude of delay and delay linearity at a 1. Pulse input. Va., = Output -pulse am- particular frequency. 2. Pulse output. plitude 3. Sweep timing markers. Pulse Testing Some delay -line manufacturers will, Distortions, if present, may be Fig. 5 illustrates a pulse- testing set- upon request, supply photographs of (Continued on page 128)

Fig. 4: (below) Photo record of delay line Fig. 5: (r) Schematic of pulse- testing setup oscillograplt DoE oulpul pulse

input pulse Fig. 6: (below) Sinusoidal test setup

oscillograph

to calibrated sweep

tinting markers

to timing frequency O->

pulse matching delac generator rrnnurannn network NM line

80 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com gage dram aK Ett94tee,t941 72oteZoo4 No. 31 Calorimetric Wattmeter Nomograph

A reliable meth- A quick means of determining r -f and microwave output power od of measuring microwave power from measurements supplied by calorimetric wattmeter is by means of the calorimetric watt- By JOSEPH F. SODARO meter. This instrument converts rf power into heat in a special dummy Fig. 1: Nomograph equates volume of flow and temperature difference load. Water flow through this load V w t J. F. Sodoro absorbs the power ICOo 70GJ 100- being dissipated. 900 5000 The number of calories which result 800 4000 70 measured by the temperature are 700 3000 rise of the water stream. The quantity of water heated is measured in 600 2000 50 cubic centimeters of flow per min- 40 ute. From these data, average watts 500 are calculated by the relationship 1000 30 . W = 0.069Vt (1) 400 700 in which V is in cc /minute and t is 500 the temperature difference between 400 ,Z20' incoming and outgoing water in de- 300 300 grees C. / The accuracy of this measurement 200 depends upon a constant flow rate. / lo Early microwave calorimeters ac- 200 100 Ai complished this by using an elevated 7 reservoir with constantly maintained /70 l00 U water level. Modern calorimeters are 50 , w 5 closed hydraulic loops maintaining r 40 w flow by means of a pump and needle a 4 30 3 s.CD., valve regulator. Cooling of the / ¢ o 100 c> , 20 w w 3 heated water is by means of a radia- o tor and fan. 900 3 / Fig. 1 is provided for the homo- 800 , ; , 10 2 graphic solution of Eq. (1). To use 700/ w this nomograph select the volume on 7 o 690 -s w the V scale and the temperature dif- ac , 5 o ference water t-- (outgoing temperature ' 500 4 minus incoming water temperature) 3 w¢ 1- on the t scale. A straightedge placed d 40 2 w _ between these points will intersect '-' 0.7 the W scale at the value of power being generated. 30 i 0.5 As an example assume that 50 cc flow into a graduated beaker in one 0.7 0.4 minute. Water temperature rises 20 0.5 0.3 degrees to 50 degrees C at this flow 20 0.4 rate, a temperature difference of 30 0.3 degrees. How much power is being generated? 0.2 0.2 Place a straightedge from 50 on V to 30 on t. Read 103 watts where the straightedge crosses the W scale. 0.1 10 0.07 0.1 JOSEPh F. SODAPO, California Registered En- gineer, 3895 Main St., Culver City, Calif.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 81 www.americanradiohistory.com B

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ALI !0 vO o o 16 O

O BRUSH BK 1090 RECORD HEAD 12 o » TAPE SPEED 3.3 ' ^/sec. i 0.Im0 RECORD CURRENT z 55ma BIAS CURRENT e o UTC TRANSFORMER LS -14,60 OHM TAP a. 44miI.GAP LENGTH O N I W 23001 INDUCTANCE a a NOISE -5.

'i' .2 .3 .5 .7 10 2 3 5 7 IO 20 30 50 OD 2 4 FREQUENCY-MC RECORDED WAVELENGTH (mil.

Fig. 1: Permeability and Q as a function of frequency Fig. 2: Response of ferrite head with glazed gap Ferrite Heads for Recording In the Megacycle Range

Ferrites are found to have resolutions comparable to metallic By W. R. CHYNOWETH heads. Problem of wear, particularly at gap edges, is minimized by glazing techniques

BECAUSE of their relative hard- 2) brittleness leading to easy frequencies in the low megacycle ness and low losses, ferrites were chipping range with as high a resolution as early considered a potential core 3) poor resolution due to granu- possible. Ferrites seemed to satisfy material for magnetic recording larity the high frequency requirements. heads. As early as 1948 some ferrite It was thought at that time that heads with an effective gap of With the possible exception of the the loss of resolution due to rough around .75 mil were built and tested. chipping, the above disadvantages gap edges caused by granularity Since that time ferrite heads have have not proven serious. Ferrites of the ferrite would be the most appeared commercially, mostly for can be molded and then ground and serious problem; therefore a ma- pulse applications where the head lapped, and this process could well terials development program was in- was spaced from the medium. In the prove to be more economical for itiated to produce a more homo- field of contact heads, ferrites have production than the handling of thin geneous and dense ferrite with satis- not fared quite so well. Early metallic laminations. factory magnetic and physical thoughts seemed to indicate the fol- The work described in this article lowing disadvantages: was done as part of a wide band

magnetic recording development. It W. R. CHYNOWETH, Electronics Lab., General 1) difficulty in fabrication due to was to build heads which desired Electric Co., Electronics Park, Syracuse, N. Y. hardness could be operated at bias or. signal

Fig. 3: High resolution ferrite head gaps Fig. 4: Wavelength response of ferrite heads

r ------'---",...... NE404.,5 NEAO #16

TAPE SPEED - 2.5 'n/ sec MEAD INDUCTANCE -1.OMHO 1000 CPS 1 RECORD B PLAYBACK -SAME HEAD LEVEL -10 DB BELOW SATURATION PLAYBACK TRANSFORMER -UTC LS-14,60 OHM TAP

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82 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com I 2 160 IN/SEC '. I III

BRUSH BK 10110 RECORD GAP LENGTH .06 MIL BIAS -.25 MA, 70KC HEAD INDUCTANCE I MH HEAD NO.13 RE ORD D SATURATED OUTPUT AT BIAS - 5 MA 70 KC 1601N/SEC IO DB ,

2 SIGRAL FREQUENCY -15 KC PLAYBACK HEAD -GE NO.15 TAPE SPEED- 2.5 "Vogt 03 D3 05 07 2 .3 .5 .7 10 2 .005 .01 .02 .05 .1 .2 .0 2 FREOUENCY-MC. INPUT TO RECORD HEAD -IMAI

Fig. 5: Response curves for head No. 15 at 100 and 160 ips Fig. 6: Comparative curves for ferrite and Brush BK1090 heads

MEW N[ AO r. // GAP LENGTH -0.12 MIL AVG. GAP SPACER -NYSOL / [3 HOURS 23 HOURS WEAR . E3 HOURS WEAR 23 HOURS 2Q

.15 . 10 RECORDED WAVELENGTH -MILS

Fig. 7: Wear (I) after 35 hrs. at 100 ips, (r) after 83 hrs. at 100 ips Fig. 8: Effect of wear on resolution of ferrite head at 100 ips

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( GAP SPACER MIL. / - f GAP SPACER - GLAZE O / A-A 21 HOURS WEAR ' AB HOURS WEAR i SI HOURS o-0

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.15 .2 3 5 7 a RECORDED WAVELENGTH - MILS

Fig. 9: Glazed head showed great improvement In wearing qualities Fig. 10: Wavelength responses taken after 21 and 48 hrs. of wear properties for use in heads. In terms The head just described (Fig. 2) scale. The wavelength response of of the original aims, this program is not a high resolution head; it could these heads is shown in Fig. 4; the was quite successful. Ferrites were be used out to 0.5 mil wavelength. problem of gap alignment at very produced with satisfactory perme- Photomicrographs of two higher short wavelengths was dodged by abilities and Q to be used as play- resolution heads are shown in Fig. 3. recording and playing back on the back heads up to 5 Mc; Fig. 1 shows It will be noted that the gap edges same head. There were some differ- a graph of permeability and Q as a appear straight and parallel and free ences in output between the heads function of frequency. That these from large irregularities. The sharp- but data on such factors as front and ferrites had the necessary physical ness of a gap edge is significant only back gap reluctance and the effect of properties to make sharp recording when related to the recorded wave- potting strains was not sufficient to headsgaps is shown in Fig 9. It will length; from this point of view the attach specific significance to these be noted that the ferrite is free from edges are not sharp and straight but output variations. It is significant large voids and blow holes and that have irregularities which are com- that the curves do not show the the gap edges are quite straight and parable to the gap length. The mini- sharp null of head #10. This is evi- uniform. Additional evidence of the mum gap length for head #15 (Fig. dence that the gap edges are less sharpness of the gap edges is 3) is around .06 mil and for head sharp relative to the recorded wave- shown in Fig. 2. The sharpness of #17 is around .03 mil, therefore the lengths at which the null should oc- the nulls is a characteristic of rela- irregularities, although relatively cur. In Fig. 5 are shown frequency tively sharp and parallel edges. large, are quite small on an absolute (Continued on page 169)

TELE-TECH 8 ELECTRONIC INDUSTRIES August 1955 83 www.americanradiohistory.com - hp -.`40A TRANSFER OSCILLATOR r ----,

VIDEO 2013 KC Ft ATTENUATOR MIXER

AMPLIFIER OSCILLOSCOPE 1

101-220 MC OSVILLATOR

L- I J

-hp- 524 B ,IIIIII®® - -- FREQUENCY COUNTER

-hp- 525 B Fig. 1: Complete measuring system requires only moderate bench space -'-100 - 220 MC CONVERTER Fig. 2: )r) Block diagram of counter- transfer oscillator arrangement Designing a Precision

Addition of transfer oscillator and frequency converter to high -speed frequency counter extends range to 12.4 KMC, and down to 0 CPS. Internal time base system holds accuracy within I part in 1 O

ACOMPLETE Fig. 3: Scope presentation as low difference integrated precision mand to extend the range of meas- frequency is approached. 60 CPS sweep on scope frequency - measuring system urements it can make to higher fre- covering the range from 0 CPS to at quencies. The counter will, for ex- least 12,400 Mc has been formed by ample, measure a frequency such combining the high -speed frequency as 9,809,271 CPS in 1 sec. Since it counter with simple auxiliary equip- displays the measurement in illumi- ment. The accuracy of this system, nated numerals and since it makes since it is derived from a precision the measurement automatically, it frequency standard, is equal to or can be operated by anyone with the better than that of other systems. ability to read numbers. The versatility of this system, how- In addition to measuring frequen- ever, is not approached by other cies as high as 10 Mc, the counter systems. The system will, for exam- will also measure frequencies as low ple, measure the carrier frequency as approximately 0 CPS. Measure- of pulse -modulated carriers or the ments of these low frequencies are Fig. 4: Typical oscilloscope presentation at limits of deviation of frequency - made by reversing the usual method zero beat when measuring stable signal modulated carriers. of measurement, i.e., by counting a Fig. 2 is a block diagram of the standard frequency from the count- components of the system. Fig. 5: Typical scope presentation at zero The basic er's time base system for the dura- beat when signal has incidental FM. component is the high -speed fre- tion of 1 or 10 cycles of the unknown quency counter which measures c -w frequency. frequencies up to 10 Mc. The fact The counter's accuracy is con- that the counter will make this meas- trolled by an internal time base sys- urement in 1 sec and that it can be tem designed to operate from a 100 operated by non -technical personnel xc frequency standard. The internal 9'lll^ ,,,v11111111 is responsible for the popularity of time base is capable of an accuracy t.0 the counter method and for the de- of 1 part in 10s. This gives the counter an overall accuracy of ±1 part in 105 ±1 count (cycle) when ALAN S. BAGLEY and DEXTER HARTKE, Hewlett - operated from a suitable frequency Packard Co., Palo Alto, Calif. standard. The frequency standard included in the counter is rated as

84 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Fig. 7: When measuring rectangular pulses Fig. 9: Pattern when checking pulsed carriers

-I -0.5 0 +0.5 .1

PARTS IN 107

Fig. 6: Distribution of error of comparison when a large number of measurements are taken

Fig. 8: Difference frequency at low value Fig. 10: When using differe,tiation technique By ALAN S. BAGLEY and DEXTER HARTKE Frequency -Measuring System having a short -time accuracy of ±1 quency is always the nearest multi- The foregoing has been the exist- part in 10 °. ple of 10 MC below the frequency to ing system for measuring frequen- be measured. cies up to 220 Ms. The requirements Converter When the mixing frequency switch established for extending this sys- has been set to the proper position, tem to the measurement of higher The second component of the sys- the converter mixes the frequency frequencies included provision for tem is a frequency converter. This to be measured with the mixing the measurement of pulsed and f -m converter actually becomes an in- frequency to produce a difference frequencies as well as c -w frequen- tegral part of the counter, since it frequency which is never more than cies, since these types of modulation fits into a panel recess in the counter, 10 Mc. This difference frequency falls are widely used at the higher fre- is operated as part of the counter, within the range of the counter and quencies. In addition, the system and has the same accuracy as the is measured and directly displayed should be able to measure these counter. Two converters are avail- by the counter. The frequency being frequencies at the millivolt level. able, one of which extends the measured is thus equal to the setting These requirements are met by counter's range to 100 Mc and an- of the converter switch plus the the system's third component, a new other from 100 Mc to 220 Mc. reading on the counter. Adding these transfer oscillator which extends the The manner in which the con- two frequencies is easy to do men- measuring range of the system to at verters operate can be described in tally, because the mixing frequency least 12,400 Mc. The transfer oscilla- terms of the 100 -Mc converter. This is always a simple value such as 10, tor is really a combination of sev- equipment multiplies a standard 20, 30, etc., Mc. eral circuits, including a stable frequency from the counter's time As mentioned earlier, the counter oscillator which is adjustable over base and makes it available as a will make its measurements in 1 sec. the range from 100 to 220 Mc. The mixing frequency in 10 -Mc steps in But it is also arranged to make range of the oscillator thus coincides the range from 10 to 90 Mc. These measurements in even shorter times with the range of the higher fre- mixing frequencies have the same such as 0.01 sec. In many applica- quency converter so that the fre- accuracy as the frequency standard tions, especially in the frequency quency of the oscillator can be meas- from which the counter is operated. range of the converters, these shorter ured at all times to the full ac- A desired mixing frequency is se- gate times permit frequency drifts curacy of the counter and converter. lected by a calibrated switch on the or the effect of tuning adjustments When a high frequency is to be converter panel. on external equipment to be ob- measured with the system, a har- To measure a frequency in the served immediately. For this reason monic of the transfer oscillator is 10 -100 Mc range, the operator con- it is often desirable to use the 0.01 - compared with that frequency in a nects the frequency to be measured sec. gate time when the counter is broadband crystal mixer contained to the converter. A calibrated wave - being used with the converter. in the transfer oscillator cabinet. meter on the converter is then ad- The 100 -220 Mc converter operates The difference frequency between justed for an indication on the con- in much the same manner as the the frequency being measured and verter's electron -eye tube. When the lower frequency converter. The the oscillator harmonic is observed wavemeter is tuned, the calibrations higher frequency converter is of on a self -contained oscilloscope. on the wavemeter control inform the special interest, however, because it When the transfer oscillator is tuned operator of the proper mixing fre- is used in extending the system to quency to use. This mixing fre- even higher frequencies. (Continued on page 134)

TELF -TECH & ELECTRONIC INDUSTRIES August 1955 85 www.americanradiohistory.com SDICE the war, our military equipment, particularly electronic equipment, has increased enormously in 27 Rules for complexity, sensitivity, volume and cost. The achievement of reliability and serviceability has, therefore, become the top problem of our armament program. Since guided missiles are more complex and sensitive Guided Missile than any other weapon, they pose the most difficult reliability problem of all. The overall reliability of a missile or complex electronic system equals, not the The goal of absolute reliability" demands new average, but the product of the reliabilities of its n Lice. Recommendations include strict attention components. construction, and adoption of the rule Po.eraii = pap_po p.. For example, if a missile contains 100 components, each having 99% reliability (which is a widely accepted By ROBERT LUSSER standard of "quality "), the overall reliability would turn out to be only 36.5rí. If a missile contains 1000 com- Reliability Coordinator, Redstone Arsenal, ponents having the same 99% reliability, the overall Huntsville, Ala. reliability would turn out to be only 0.02%. The reliability formula indicates, furthermore, that, Mistrust inspections and check -outs. Although in order to achieve an overall reliability of 80% for 7 they are indispensable, they are not, and cannot a missile containing 4000 components (which is by no be, conducted under the environmental of means unusual) one can tolerate, on the average, not conditions flight that are usually much more Therefore, more than one failure in 18,000. severe. they do not nearly suffice to make missiles reliable. As an aid to the designers of guided missiles and their components, the following twenty -seven rules, based Mistrust flight testing as a means of improving on the latest experiences in the field of reliability, are 8 reliability. Of course, we have to test missiles in offered. flight in order to determine environmental conditions, and important flight parameters. Yet, since missiles are Reliability is not an "ability" but a probability, not recoverable, it is nearly hopeless to try to determine 1 namely, that an item will operate successfully the "ultimate" cause of a missile failure. under service conditions. Failure to clearly recognize this mathematical implication may severely delay the 9 Mistrust any specification unless you have been development of a guided missile. Study, therefore, the able to determine whether or not it is really ap- basic concepts of statistics and probability. plicable to the missile and to the component you are going to design or to select.

Study in particular the unique reliability prob- Try hard to get from those responsible for the 2 lem of guided missiles in all its practical and 10 systems design, the actual environmental condi- theoretical aspects. tions under which the component will have to work reliably. In many instances, you may encounter vagueness. Avoid Rube Goldberg designs. The effort to Insist upon an answer. If your component should fail and 3 achieve reliability goes up with about the square cause the failure of a missile it is you who may have of the number, n, of the components. A very complex to take the blame rather than those who gave you the design may, therefore, never become reliable and wrong information. serviceable. Simplicity should be the art, vocation, and objective of every designer. If an environmental condition, any shock, has not 11 yet been determined numerically, make a gen- 4 Mistrust the validity of the time- honored con- erous estimate and apply safety factors of ignorance cepts of quality and reliability. Many are obsolete that are the larger the less the environmental condition as far as guided missiles and their components are is known. The opposite would certainly ruin your missile. concerned. Once the condition has become well known, say 12 through flight tests, you may reduce these factors, 5 Mistrust the concept of redundancy. In guided if desirable. The opposite principle, that of beefing up missiles, no human being is aboard to make the the strength of the components at a later stage, will decision to switch over to the stand -by component. most certainly ruin the missile type because the design must be frozen once production is ordered. 6 Mistrust the concept of "Production Environ- mental Testing." It teaches that missiles and Before designing or selecting a component type their components can be "debugged" prior to flight by 13 inquire what level of component reliability must shaking, shocking, or pre- aging. Actually, bugs may be achieved for the particular type of missile. For not only be tested out but also tested in because some reasons discussed earlier, the component reliability may of the many sensitive components may become fatigued have to be ten times or even a hundred times more and fail later in flight, thus causing the whole missile reliable than the commercial product, depending on the to fail. complexity of your missile.

86 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Do not be mislead by the widespread opinion that 20 it is just the environment of shock and vibration that needs to be considered in a test to failure program. There may be hundreds of other design criteria that may be hazardous to the missile, such as maladjustments, Design Engineers misalignments, electrical and mechanical instabilities, structural overloads, frictions, insufficient power supplies, mechanical and electrical resonances, and many, and more rigid standards of engineering prac- many others. Whenever you have the slightest suspicion to specifications, a striving for simplicity in that one of these design criteria may become hazardous that testing to failure is mandatory. to your component, and your missile, you should insist that it be included in the test to failure program. Suspi- cion is the father of reliability; optimism and gullibility ruins it.

Do not rely on the test to failure results of just 21 one unit. A subsequent unit might be much weaker. Therefore, insist that the characteristic variabil- Never worry about design reliability of your com- ity of the "strength" value of your component type be 14 ponent being too high. Rather, strive for "ab- determined by testing a statistically significant number solute" reliability, that is, make sure that not more than of units. This will be the only sure way to determine one unit in 10,000, or better, one in 100,000, will prob- whether or not your component has really attained the ably fail under service conditions. Only then may you required "absolute" level of reliability. be sure that your component will never "kill" an expensive missile. After you have achieved the required "absolute" Consider every component type as a potential 22 design reliability of your component, make sure 15 "killer" of a missile until you have absolute proof that it is maintained in production and operation. Follow that it is highly reliable. Mistrust any claim of "high your component through all subsequent phases of pro- quality," and "maximum reliability" unless you have duction, assembly, inspection, transportation, storage been able to convince yourself that the selected com- and operation. You may detect new unexpected weak- ponent type can stand up under the environmental serv- nesses. ice with unusually high safety factors. Safety factors of 1.5 or 2, although still specified To this end, see to it that periodic tests to failure, 16 in most specifications, should be disregarded be- 23 on a sampling basis, are performed as long as cause they are not nearly high enough to achieve the your component is being produced. "absolute" level of component reliability required in guided missiles. If you can attain a safety factor of Insist that Statistical Quality Control be applied 10-and in most instances you can -you are contributing 24 to your component. However, make sure that the much more to the reliability of the missile than if you proper yardsticks of reliability are applied. Remember, were satisfied with a safety factor of 1.5 or 2. not more than 1 out of 10,000 units may be permitted to fail. Prove the existence of these high safety factors 17 by testing all component types to the point of failure. This will help you determine the "modes" of Confer with the manufacturer of your compo- failure, that is, the predominant weaknesses of your 25 nent. The best component type may become a component. By feeding back such knowledge into design severe hazard to the missile if its design reliability can- you may raise the reliability of your components con- not be maintained in production. This may easily happen siderably, sometimes by orders of magnitude. if your design is inadequate to the needs of manufacture. For example, tight tolerances may badly impair the re- Do not believe that the test to failure method is liability of your component because they may make 18Q "intolerably expensive." True it may cause addi- manufacture difficult. Remember, in guided missiles we tional effort and worry to you and to the test labora- are interested in "reliability," and not necessarily in tories. Yet, in the long run failure testing will pay high "quality." These two properties are often unrelated and dividends to you, your company, to the taxpayer and to even opposed to each other. the Armed Forces because it is virtually the only sure way to raise the reliability of your component up to the Should your component show a weakness do not required "absolute" level and to make your missile reli- be too quick to place able and serviceable. 26 the blame on the manufacturer. In many instances the failure might actually origi- In planning a test to failure program for your nate in a design oversight of your own. 19 component, black box or missile, anticipate all conceivable modes of failure, even if some may appear Keep in close contact with users. Your missile to be very remote. Even a remote weakness of your com- 27 may have attained high intrinsic reliability, yet, ponent may once in a while kill a missile that may be ten it may be useless if this reliability cannot be maintained thousand times more expensive than your component. in service.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 87 www.americanradiohistory.com CAP

DIELECTRIC MATERIAL An evaluation of the electrical and mechanical stability under service conditions of the polyester and epoxy laminates currently in use as isolating dielectrics for cap -type aircraft antennas

MATCHING COAXIAL CABLE UNIT

TO By H. J. SANG and E--TRANSMITTER B. M. SIFFORD

Fig. 1: Dielectric isolates tail cap section from fuselage Structural Dielectrics In Cap -Type H -F Antennas

THE use of flush antennas is be- sider how one aspect of the antenna quired to match. The losses in the coming standard on all new design-the electrical properties of dielectric material at a particular high -speed aircraft. The flush con- the dielectric gap material- affects frequency depends upon the dimen- figurations which appear most suit- the electrical performance of the sions of the antenna gap, the im- able from the electrical standpoint cap -type h -f antenna system. pedance of the antenna, and the for the 2 -24 Mc liaison communica- Fig. 1 shows a simplified sketch of electrical properties of the dielectric tions band are the cap -type antennas a typical tail -cap antenna. The material. The radiation pattern effi- made by electrically isolating a por- shaded area represents the dielectric ciency of the antenna, which is de- tion of the vertical stabilizer or the skin of the isolating gap. The an- fined as the fraction of the total ra- wing tip with a structural dielectric tenna is connected directly to an an- diated power which goes into sectors material. The study described in this tenna matching unit which automati- paper has been concerned with an cally transforms the impedance of evaluation of the stability of the the antenna to a constant 50 ohm Fig. 2: Impedance characteristics of antenna electrical and mechanical properties level. The matching unit is con- under service conditions of struc- nected through a coaxial cable to a +400 80N tural dielectric materials located currently remotely transmitter. _ in use or considered for use in air- The principal power losses in the +300 60 0 craft antennas of this type. These antenna system are the loss in the +200 40 id materials consist of various kinds of coaxial cable from the transmitter to z 4 glass fiber -resin laminates. the matching unit, the loss in the 20 ÿ The electrical performance of a matching unit, the loss in the di- N communications antenna system is electric material of the isolated sec- o otki determined, of course, by how effi- tion, and the loss due to radiation ciently it radiates power from the from the antenna in directions not transmitter in the directions useful useful for communications. The loss w -200 to communications. It is the purpose in the coaxial cable is directly pro- cc in this part of the discussion to con- portional to frequency and cable -300 length and also varies with the vswx on the cable. The losses in the ele- -400 ments of the matching unit depend H. 1. SANG and B. M. SIFFORD, Stanford Re- 5000 search Institute, Menlo Park, Calif. primarily upon the Q of the load 4 8 12 16 20 24 (i.e., the antenna) which it is re- FREOUENCY (Mc)

88 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com i00

TRANSMITTER I MATCHING UNIT DIELECTRIC I ANTENNA 9 90 -

"i EFFICIENCY= 1 Lc G ICD GD ICA G p 7 T 80 - 1+ QA + QC GA 70 QA ASSUMING CD« CA GA«wCA =0.3 60 OC POWER TRANS. EFF.- I - I+A +GD QC GA 50 40 - 04 =1.0 OA 30.- =3.0

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0- 1 1 1 0 2 3 4 5 Gp A-606H-56? GA

LARGE METAL SHEET WELL GROUNDED Fig. 3: (above left) Equivalent circuit at low frequencies

Fig. 4: (above) Effect of dielectric loss on power transfer

Fig. 5: (left) Set -up for measuring losses of isolating dielectric

useful for communications purposes, tive to the airframe will depend upon Furthermore, in most installations, depends upon the size and configu- which airframe extremity is used as the loss in the coaxial cable can be ration of the airframe and the loca- an antenna and, to some extent, on neglected if a low loss cable is used tion of the antenna. the airframe configuration, it is and a good match is provided by the The impedance characteristics of found that the radiation pattern ef- coupler. In the 2 to 6 Mc range, a typical tail -cap antenna are shown ficiency is relatively independent of therefore, the antenna performance in Fig. 2. The behavior of the resist- such changes in pattern orientation. will be a function primarily of the ance component is determined pri- The designer hence has little control dielectric loss and the matching unit marily by resonances of the major over the antenna pattern in this fre- loss. The measure of the antenna airframe elements such as the wings quency range, so the other design performance at these frequencies and fuselage. A larger cap size gen- factors become paramount. (Continued on page 180) erally raises the level of the resistance curve slightly while decreasing the reactance. Fig. 6: Dielectric conductance measuring equipment and sample holder In the high frequency range-say above 6 Mc -the antenna impedances are usually such that relatively high efficiency can be obtained from a matching unit with reasonably low loss elements. Also the equivalent antenna radiation conductance will usually be much larger than the equivalent loss conductance placed across the gap by even the most lossy dielectric materials. The performance above 6 Mc, therefore, is governed primarily by the radiation pattern characteristics and coaxial cable losses. For frequencies below 6 Mc, the wavelength becomes larger than the largest aircraft, so that the radiation patterns of any cap -type antenna degenerate into the radiation pattern of a simple dipole. Although the orientation of the dipole pattern rela-

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 89 www.americanradiohistory.com Designed for amplifying the low level outputs of thermocouples and strain gauges, this extra -sensitive magamp employs two high gain push -pull stages, with negative voltage feedback

By F. GOURASH Low Level Magnetic

INPUT signals for many control drift is kept to a minimum. The systems are obtained from ther- detrimental effects of component (ii i21= iL mocouples, strain gauges, and bar- instability are minimized by obtain- RM rier -layer photocells. It is desired ing the overall power amplification to use these signals to perform some with two high -gain stages in cas- useful function such as to actuate cade. The application of negative an alarm, provide information on an voltage feedback around both stages RL indicator, or control a processing insures a high degree of gain stabil- system. Signals from these de- ity and provides the necessary 1 vices, however, are at very low linearity. The input impedance is RM power levels and cannot perform raised to a level many times higher their intended functions directly. than the ohmic resistance of the in- They must be amplified to higher put circuit which makes the ampli- L2 power levels before they can be fier essentially a voltage-sensitive

RM Mixing resistors effectively utilized. The low -level device. The over -all characteristics RL Load resistor amplifier provides the necessary and performance exhibited by the 11,ís Amplifier currents power amplification. It must be ex- amplifier are favorable to its appli- IL Output load current tremely stable and sensitive in order cation in a wide variety of low -level to detect the low -level signals it systems. Fig. 1: Resistive mixing circuit for mogamp receives. A short time constant is also desirable for the amplifier so Design Analysis that no appreciable time lag is in- F Fi- ( +1 SAT. z troduced into the system. Low -level The design analysis is carried out W magnetic amplifiers have been built for a particular thermocouple appli- U to meet these requirements; they cation to illustrate the design fea- O o exhibit zero drift levels of 10 -o watts tures of the amplifier. The design with time constants of the order of features, however, are not limited OUTPUT CURRENT seconds'. Although some laboratory solely to the thermocouple applica- AMPLIFIER I models have zero drift levels of 10 -" tion, but are applicable when the watts', it is difficult to build practi- amplifier is used for other types of ( -)SAT. DC CONTROL CURRENT cal models to have this drift level. low -level systems.

( -) ( +I In this article we will describe the An Iron -Constantan thermo-

( -) SAT. design and performance of a two - couple is subjected to a hot junc- stage low -level magnetic amplifier tion temperature range of 330 °C. that was successfully developed to and produces a linear output voltage meet the exacting requirements of change of 0.055 my / °C. It has a lead BIAS POINT a temperature indicating and alarm resistance of 20 ohms. The ampli- thermocouple application. The am- fier must receive its input signal AMPLIFIER II plifier exhibits a zero drift level from the thermocouple and drive of 10 -" watts referred to the input both an indicating instrument and ( -) ( +t SAT. for the specified conditions of the control circuits of relay ampli- voltage, frequency, and ambient fiers. The relay amplifiers provide temperature. The response charac- the alarm signals at various preset Fig. 2. Transfer curves, push -pull op_rati_n teristic is critically damped with a temperatures. These functions are response time of 0.10 secs. to be performed to an accuracy of Fig. 3: Block diagram of 2 -stage magcmp total Conventional circuitry and existing 1%. A maximum response time of INDICAT N4 individual 1 is but faster DEN CE components are used. An sec. permissible, a biasing arrangement and matched response is desired. Ambient tem- cores and rectifiers maintain a bal- perature varies over a range from K. sT,1 a. ST2I anced amplifier. Consequently, zero 0 °C. to +70 °C. The supply voltage OUTPUT PST STAGE CONA STAGE is 120 v., 800 cycles. Ten percent voltage and five percent frequency

F. GOURASH, East Pittsburgh, Pa. plant of the variations are specified. 0E0 NEGATIVE vOLTAGE Westinghouse Electric Corp. An appraisal of these specifica- EEO BACK tions dictates a high -gain sensitive

90 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com HERMETICALLY SEALED UNIT

Amplifier

amplifier with an extremely stable and linear output current vs. input voltage transfer characteristic. The response time is to be as short as ( -1 IOV 3OV i0vl possible. The difficulties experienced I with the design of low -level mag- -rvYwr netic amplifiers to meet similar specifications arise because the compon- L_ BIAS (+) o120 Va ents are not sufficiently stable for the SUPPLY 800n, circuitry used to permit operation at the low input levels with a high degree of accuracy. The self -satu- Fig. 4: Schematic circuit diagram of 2 -stage low level magnetic amplifier rating, push -pull circuit is commonly used because it has a high gain characteristic. This circuit con- RATED i- +3.0 sists of two amplifiers that are VOLTAGE 120 V z biased for maximum gain and whose outputs are mixed in a common RATED cw load (Fig. 1). A given dc input FREQUENCY 800,N, crer signal drives one amplifier toward LOAD RES. 3203 -n v c +2'0 positive saturation and the other amplifier toward negative satura- INPUT D a tion by the same amount. The out- IMPEDANCE 3660.a F- - put current is the difference be- J +I Q tween the ó two load currents (Fig. U 2). At zero input signal the two o_ load currents are equal for a well - balanced amplifier and the output current is zero. Instability of cores -IO -7.5 -5.0 -2.5 0 +2.5 +5.0 1-7.5 +10 and rectifiers unbalances and pro- DC INPUT VOLTAGE duces an output current with zero IN MILLIVOLTS input signal. The unbalanced amplifier also produces some gain drift. The self -saturating, push -pull circuit is used in the thermocouple amplifier to take advantage of the -2.0 high gain characteristic, but the amplifier is designed to minimize the effects of component instability on over -all performance. The ther- -3.0 mocouple amplifier consists of two stages with negative voltage feed- Fig. 5: Clo ed loop transfer curve, defines operation for rated conditions back around both stages. This produces a two time delay system as back ratio. The static gain for this over -all amplifier stability is de- shown in Fig. 3. The LaPlace trans- system reduces to: pendent on the stability of the feed- form for this system is as follows': back circuit. With an essentially re- Eo(s) Eo K,K, sistive load circuit, the stability G(s) _ (1) G - - (2) problem is reduced to that of main- Eia(s) Ein 1 +ßK,K2 taining a stable feedback ratio. K,Ks The two stages are designed for By designing high gain into the both high power and high voltage (1 + ST,) (1 + ST2) + ßK,K, two stages to permit a large feed- gain. The first stage achieves its K,, Ti, K_, and T_ are the voltage back ratio, the product R K,K: is power amplification not by con- gains and time constants of the first also large and the over -all gain re- trolling a large amount of output and second stages, and (3 is the feed- duces to approximately 1/(3. Thus, (Continued on page 153)

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 91 www.americanradiohistory.com Stacked Ceramic Tubes

showing the four ceramic rings and several metal parts which make up the envelope. This photograph helps to visualize the stacking method of assembly. Conical formation of the metal rings, particularly at the base of the stem, insures adequate rigidity. In all of the tubes here described, Fig. 1: Stem structure of 5 kw tube has four ceramic rings the ceramic employed is of the aluminum type. Metalizing is by the refractory metal powder sintering THE term "Stacked Ceramic right -hand view in the photograph technique. Only high temperature Tube" means a construction in is a cut -away section through the brazing alloys such as copper -gold which all of the tube parts, including stem of the tube and clearly illus- and the like are employed at the envelope sections as well as elec- trates the envelope construction ceramic -to -metal seals. In standard trode structures, are assembled by built up on ceramic and copper production these seals normally pass simple stacking operations. Both rings, the latter providing electrode rupture pull tests of the order of transmitting and receiving type supporting members. These envelope 5,000 psi. High temperature ma- tubes will be described. In the re- sections are all self- jigging, so that terials are used throughout to per- ceiving type tubes, the stacking axial and vertical alignment is ob- mit bakeout at elevated tempera- technique has been developed to the tained automatically when the parts tures during tube manufacture, and fullest extent. are stacked together, without re- to provide a tube which will operate Fig. 2 shows side elevation and quiring skilled operators. The en- in high ambient temperature en- sectional views of a tetrode having tire envelope stem structure is vironments. an anode dissipation rating of 5 kw, brazed together in a single furnace which is representative of a larger operation. HAROLD E. SORG is Vice- President, Research tube in the transmitting tube cate- Fig. 1 is an exploded view of the at Eitel-McCullough, Inc. San Bruna, Calif. gory, identified as the 4X5000A. The stem structure for the 5 kw tube,

Fig. 2: Side and sectional views of 5 kw transmitting tetrode. Fig. 3: 150 watt tetrode. Ceramic and metal rings comprise side wall.

92 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com New developments in the application of ceramic -metal assemblies to transmitting and receiving tube construction. Adaptabil- ity to modular circuitry cited.

By HAROLD E. SORG

Fig. 3 is a photograph showing side and cross section views of a Fig. 4: Exploded view-150 watt tetrode Fig. 5: Preferred socket contact arrangement smaller 150 -watt transmitting tube having characteristics comparable to the Eimac 4X150A glass tetrode. This illustrates advanced techniques in stacked construction wherein ceramic and metal rings are sandwiched together to build up the envelope side wall. The interposed metal rings function as electrode supports and also as terminal members, being radially extending segments of the metal side wall rings. This introduces a unique method for socketing the tube.

Stacked Relationship

Fig. 4 shows exploded views of the above tube, the left -hand portion of the photograph showing the parts completely exploded and the right - hand illustrating the envelope sub- Fig. 6: Ceramic double triode (r) is counterpart of familiar glass 65617 assemblies prior to mounting the electrodes and final sealing. These views illustrate the stacked relationship of the ceramic and metal rings Fig. 7: Sectional drawing illustrates positioning of tube elements making up the envelope and also show the tubular electrode supports which are formed as an integral part of the metal side wall rings. Fig. 5 is a drawing illustrating the preferred socketing arrangement for the 150 -watt tube. The socket has contact segments complementary to those on the tube so that the tube may be inserted into the socket and then turned to rotate the terminals into engagement under the socket contacts. A spring in the socket presses the tube upwardly against the socket contacts. The lower view / in the drawing looks down on the :: socket and indicates the arrange- ray/ ment of the contacts. Fig. 6 shows a small double triode in the receiving tube category similar in characteristics to the 6SN7 (Continued on page 191)

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 93 www.americanradiohistory.com FIG. 1 Complete transmitter and power supply assembly is mounted on a single printed circuit card An Airborne Standby VHF

By KENNETH M. MILLER

Compact, rugged, printed circuit unit works off aircraft's 24 v. storage battery

Many military as reliable as the state of the art will transformer and the associated filter aircraft employ both permit. reactor and capacitors. The obvious a 400 CPS power 2. Physical compactness -If the bonus yielded by the use of these plant and a storage end product is large and bulky, space small components are reduced battery. In these and weight considerations might weight and size. Furthermore, these iraircraft the radio prevent its application in the already 400 CPS vibrators are hermetically ommunication over burdened modern military sealed to nullify the detrimental ef- quipment is nor - aircraft. fects of humidity and high altitude nally powered by 3. Performance -It must accom- operation. he ac power gen- plish the basic task of providing The total power requirements of rator. It is obvious, clear communication at distances this equipment are 1.75 amps when K. M. MILLER therefore, that the equivalent to line of sight paths on receiving and 3.0 amps for transmit- jloss of ac power an emergency frequency universally ting, using a 27.5 v. dc voltage will create a hazardous situation for used today at both military and com- source. both the crew and the aircraft. To mercial airdromes. The power output from this power overcome this problem a project was supply is 120 v. dc at 100 MA during established to design a VHF the "receive" duty cycle and 220 v. trans- . Power Supply mitter- receiver which would pro- dc at 125 MA during the "transmit" vide maximum reliability and which Once it was established that the duty cycle. Conversion of the ac out- would assure radio communication unit was to be powered by the air- put of the transformer to dc is ac- during an emergency caused by an craft's 24 v. battery, two basic types complished by means of a selenium ac power failure or failure of the ac of power supplies were considered: rectifier designed for military appli- operated communication equipment. These are dynamotor and vibrator. cations. In order to permit the use The equipment about to be In the interest of maximum relia- of a single power transformer sec- described uses no ac power. It is bility, compactness, and light weight, ondary winding, a full wave rectifier operated directly from the aircraft it was decided that a vibrator supply circuit is used during "receive" and storage battery. would be used. Recent developments a bridge circuit is used during Several objectives were estab- have yielded relatively long poten- lished at the onset of the project. tial life from vibrators operating at KENNETH M. MILLER is chief engineer of the Lear, Inc., 3171 S. Bundy Dr., Foremost were the following: 400 CPS. This high vibrator frequency Learcal Div., Santa Monica, Calif. 1. Reliability -The device must be permits the use of a compact power

94 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com contact tips FIG. 2 Etched circuit cards are mounted "back -to- back" FIG. 4 Printed circuit boards have rhodium -plated

II I II II ,III',il', I,J'I,.Ai :;,;i,iÍuuauluÍÍÍIJrIünildÍulludulÍuÍllhüliÍÍiÍÜÍiÍÍiÍÍiüi_ .:.;Í ÍÍ',ÍÍÍÍÍÍÍÍ {ÍÌÍÍÍÍÍI ÍÍÍÍÍÍI bi'áitilll III

Q FIG. 3 Receiver assembly, too, is complete on single card FIG. 5 Miniature i -f transformers employ toroids with of 140. Transmitter and Receiver

"transmit." The changeover of cir- operation when exposed to the above at the points required for the com- cuitry is accomplished by energizing conditions, many of the time proven, ponents. The remainder of the foil relay K2. This is done automatically plus some fairly new techniques of serves as a ground plane. This per- when the "press -to- talk" button on ruggedization, were employed. The mits the operation of both the re- the microphone is depressed. use of etched circuits contributes ceiver and transmitter without being The overall dimensions are 113/4 substantially to the excellent per- assembled as a unit. This is of great long, 51k wide and 33/4" high. Total formance obtained under conditions assistance should servicing be re- weight is 6 lbs. This includes the of vibration. Fig. 4 shows the use quired. transmitter, receiver, and vibrator of this technique. Several base ma- Note in Fig. 2 that two of these power supply and mounting base. terials for the etched circuit cards etched circuit cards are employed in Components have been selected to were considered. Influencing the a "back -to- back" configuration. The provide reliable performance when final decision were the importance entire receiver is contained on the subjected to the rigorous environ- of such factors as 1 -low radio fre- left card and the transmitter, includ- mental conditions set forth in MIL- quency losses (some circuits operate ing the modulator and the vibrator E -5400. Amongst these are the ever at 121 MC), 2 -low moisture ab- power supply, are on the right card. unpopular (to the equipment de- sorption, 3-physical strength, 4- These are shown individually in Fig. signer) and to a minor degree, reasonable 1 and Fig. 3. Attention to detail is 1. Operation at ambient tempera- cost. The results of the investigation exhibited by the use of rhodium tures between -55° and +55° C. indicated that an epon glass would plating on the "fingers," or contacts 2. Operation at altitudes up to be the best choice for this applica- of the cards, which plug into the 60,000 ft. tion. The cards have 0.003 -in. thick mating printed circuit connectors. 3. Operation at relative humidity copper foil laminated to each side. The rhodium plating extends inward of 100% at +50° C. The copper foil is gold flashed to from the edge of the card for a dis- 4. Requirement for storage with- provide good RF conduction plus the tance of approximately 1/4". It has out permanent damage to tempera- added benefit of ease in soldering. been determined that ordinary tures of -65 to +85° C. Each transmitter and receiver card printed cards with 0.003 in. thick 5. Requirement for moisture and is designed for dip soldering which copper will endure only approxi- fungus proofing. provides economy in production as mately 25 insertions in the mating 6. Vibration of 0.06 in. double ex- well as maximum reliability result- receptacle before copper is worn to cursion over the frequency range of ing from uniformity in the quality of the point of causing intermittent 10 to 55 cps, and the soldered connections and elim- contact. The hard rhodium plating 7. It must remain operative after ination of failures caused by wire has produced cards showing negli- submission to impacts of 15 G's breakage. gible wear after 1000 insertions and acceleration in any direction. The copper foil on the component withdrawals. To assist in achieving successful side of the card is etched away only (Continued on page 161)

TELE -TECH 8 ELECTRONIC INDUSTRIES August 1955 95 www.americanradiohistory.com Unique forward and reverse characteristics of these rectifiers provide power conversion efficiencies of more than 90 %. Units show negligible aging effects Germanium Power Rectifiers

By JOSEPH T. CATALDO and NOEL ILE

Fig. 1: Fan -cooled 60 kw germanium power rectifier

THE PHYSICAL and electrical nium power rectifiers show forward rating protects the metallic junctions advantages inherent in german- voltage drops low enough to supply from damage and provides longer ium diffused junction rectifiers ac- dc current with exceptional effi- operating life. Even with such derat- count for their increasingly wide- ciency. The effects of temperatures ings, permissible voltages may be spread use in industry. Within the in- on forward drop is given in Fig. 3. comparatively high at ambient dicated ranges of application, these The effects of load current variations temperatures up to 75 °C. relatively new germanium power on forward voltage drop is shown in Because of their unique forward rectifiers offer a number of superi- Fig. 4. and reverse characteristics, german- orities over other types now avail- ium power rectifiers provide ac to dc able. power conversion efficiencies of more Less Reverse Flow A maximum amount of forward than 90 %. Their low forward volt- current is an engineering objective. The low reverse leakage of a ger- age drop and high permissible cur- Theoretically, a perfect power recti- manium power rectifier decreases by fier would provide zero forward re- a large factor as the ambient tem- Fig. 2: Germanium rectifier construction sistance and infinite reverse resist- perature is reduced. It is interesting ance. In practical operation, some to note in Figs. 5 and 6 how the power losses are inevitable in metal- already low leakage at 25 °C. con- lic rectifiers. Fortunately, the for- tinues to decrease rather than swing- ward voltage drop in germanium ing upward at some point below power rectifiers is extremely low in room temperature. It is also evident comparison with other metallic rec- that the increase in forward losses NEGATIVE tifiers. Compared with silicon dif- as temperatures are lowered is at WIRE LEAD fused units, the forward drop in least partially compensated by con- germanium is only about 20 %. currently decreasing reverse losses.

In common with other metallic Ratios of forward -to- reverse losses ENCLOSURE and rectifiers, germanium types show are also affected by the magnitude POSITIVE TERMINAL temperature- dependent forward and of the reverse voltage and by resist- reverse characteristics. For of example, ance the rectifier. INDIUM the forward drop at -60 °C. is The effects of voltages on reverse roughly 20% higher than at 25 °C. currents in typical 10 ger- RECTIFYING -amp BARRIER SURFACE At 75 °C., the forward drop is manium power rectifiers are plotted slightly under 10% below that shown in Fig. 5. These curves show one unit at 25 °C. Even at -60 °C., germa- may have negligible leakage at 100 v. GERMANIUM compared with another that has less WAFER leakage below 60 v. When reverse JOSEPH T. CATALDO and NOEL ILE, International losses become an important fraction Rectifier Corp., 1521 E. Grand Ave., El Se- of the forward drop, or at higher gundo, Calif. ambient temperatures, voltage derating becomes necessary. Such de-

96 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com -80 -60 -Yu -20 U 20 40 60 80 0.6

JUNCTION BASE TEMPERATURE -°C

0.5

0.7

0.4

0.6 0.3 iz IO AMPERE GERMANIUM POWER JUNCTION FORWARD DROP vs LOAD CURRENT 0.5 0.2

c. 0.1 0.4 ° LOAD CURRENT IOC AMPERES)

2 4 6 6 10

Fig. 3: Forwa d drops vary with temperature, but are very low Fig. 4: Effects of load current variations on forward drop

Fig. 5: (I) Effects of voltages on reverse currents in 10 a. rectifier

Fig. 6: Reverse leakage decreases as is 100 75 50 25 temperature reduced

VOETS RMS 0.5 _-_/ 0.5 I.0 1.0

I i , SIAa IIIVA W

INPS IO E GERMAN UM POWER 1121011 N l REVERS CURRENT ,1 TEMPE ITIAE

1532p M 2.0 OE g 2.0 IRPio 1,11,15 50 a Robe . I erga so* - INPUT. 56 V RMS

IUD CURRENT: IO INPS 3 oa R FA'' IMAM IIOtAW I .= Mil 3.0 FM- 3.0 N

W -II t a

11 C1: ISSU aNPOAATUK -.0 rent.- densities (about 75 amp/cm.2 sections of a rectifier assembly. The tive. This holds true regardless of average readings in half -wave cir- amount of derating needed depends the rating of a germanium power cuits) permit production of stack or upon how closely units are matched rectifier. The efficiency of this type other multiple rectifier assemblies at temperatures likely to occur dur- rectifier depends more upon the that are light in weight and small ing normal operation. precise processing of the germanium dimensionally. Overheating, caused by current wafer and complete diffusing at the As a result of the high voltage above the normal load limit or too germanium- indium junction than on rating per junction, the number of high ambient temperatures, is a any forming action in service. junctions needed in series to form a common cause of failure in germa- In a broad sense, germanium high voltage assembly is reduced. nium power rectifiers. Such failures power rectifier production is an art With fewer units required in series, can occur suddenly if units are not as well as a science. Continuing re- the overall forward drop of a ger- operated in accordance with manu- search will undoubtedly reveal more manium rectifier assembly is ex- facturers design recommendations. precisely the factors governing such ceptionally low. One result is im- Operating experience shows that power rectifiers. This should make proved voltage regulation, as shown fan or liquid -cooling, plus neces- possible production of crystals ap- in Fig. 7. The absence of any ap- sary voltage derating in high ambi- proaching nearly ideal characteris- preciable aging effect in germanium ent temperatures, delivers useful tics. rectifiers assures high efficiency and amounts of power at higher voltages excellent voltage regulation for a than are safe for convection- cooled very long time. Fig. 7: Voltage regulation in half wave circuit Field tests to date units. In case the cooling equipment with resistive load show no appreciable change in for- fails, provision should be made for 1.1. 1NRNIN,, teI SO R ward or reverse resistance after immediate Y11: NN J removal of voltage to fan so NM 1,250 working days. or liquid -cooled rectifiers. la As with other semiconductors, ger- "Forming" treatment such as re- 9 30 manium power junctions-whether quired with other type rectifiers is aN`W used in series or in parallel should » 1 - not needed when putting germanium tl MRRNS be carefully matched for character- rectifiers into operation. Nor is there istics. Voltage derating permits rea- "deforming" to .3,1 MS any effect evident when IW COOT iMN7II1 sonably equal heat dissipation in all germanium junctions are inopera-

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 97 www.americanradiohistory.com PART ONE OF TWO PARTS

Improving

minal boards. Resistors and capacitors which are designed for mounting by their wire leads, but which are too heavy for point -to -point mounting in the particular applica- Fig. 1: Potting and printed wiring highlight the "reliability" program Co. at Hughes Aircraft tion, should be strapped down. Terminal boards can impede con- vective cooling of components (especially when mounted horizontally), and heating of capacitors or germanium products by adjacent resistors The first step popularity of a new idea appears to causes many failures. Terminal in reliable -izing a depend on publicity, choice of a board construction is more difficult product is to view "catchy" name, and prestige of the to circuit -trace during maintenance it with a com- sponsors. It should depend solely on than is point -to -point wiring. Vi- pletely logical and a logical and objective evaluation of brating a terminal board at its res- unbiased attitude. its suitability for the proposed appli- onant frequency can damage the Although it is not cation. And wherever possible, re- parts mounted on it. Cabling wires can cause a of impossible for the ports of failures during assembly together deterioration performance due to crosstalk, a de- designer to ap- and in the field should be analyzed proach this ideal fect that is not uniform even among by a separate group to determine various units of the same production viewpoint it is usu- whether innovation ally wise to ap- the actually run. But the engineer can minimize worked as expected. "8 H. B. Brooks point a separate out these difficulties with careful design; group to evaluate Construction and terminal board mounting of reliability. This reliability group can In the narrow sense, "ruggedness" components with cabled wiring is guide the choice of parts and con- is the ability to withstand shock and preferred in military equipment. struction techniques effectively, and vibration without failure (powered Stranded wire is good for long leads usually without excessive waste or or "cold," as the application re- because it can flex without fatigue, duplication of design effort. Unfor- quires). Components must be and in doing so it dissipates some of

tunately, redesign of the basic sys- mounted rigidly enough to endure . the vibratory energy by friction be- tem or circuitry does waste time and the expected acceleration ( "g ") and tween strands. Strain on terminals design effort, and for that reason the to elevate their mechanical resonant should be relieved by providing development engineers themselves frequencies.'5, 28 slight excess length of stranded wire, should be taught the principles of Direct, point -to -point wiring with or by crimping solid wire component system and circuit design for relia- short leads can be made rugged. leads. bility as rapidly as they become One manufacturer, in the competi- Criticism for the appearance of known. tive market since 1930, has used it components and wiring that deviate The choice of circuits, components widely, and a recommendation has from the four points of the compass and techniques is dominated by fads. been made that it should be accepted can be avoided by "potting," or en- Engineers are slow to adopt some in military equipment.5 Where capsulating the assembly in an elec- innovations while others sweep the mounted -part terminals alone do not trical insulating compound. This also country and find wide acceptance have adequate strength to support increases flashover voltage and rig- even where they are unsuitable. The interconnected parts by their leads, idity, and reduces moisture absorp- strong terminals should be added for tion. Its disadvantages are poor heat this purpose. These should be dissipation, higher stray capacitance, chosen with great care to ensure difficulty of repair, and possible adequate strength after assembly chemical, mechanical or thermal HERBERT B. BROOKS, Test Equipment Engineer: to Develop- ing Dept., Hughes Aircraft Co., Tucson, Ariz. and the heat of soldering. They may damage the components. be in the form of single standoff in- ment of a moderately soft plastic sulators, multiple tie points, or ter- foam (pliant and mechanically dis-

98 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com A separate plant group responsible for "reliable -izing" RECEIVING TUBES techniques is seen as key to problem. Methods for w 2000HR J boosting reliability are described. Z E á 1000 HR

tJ Q By HERBERT B. BROOKS 1000 2000 3000 HOURS IN SERVICE

Fig. 2: Despite progress made In "reliable - izing" program tube life is unpredictable Electronic Reliability

sipative) should receive more atten- harm than good if the mount is per- dental short circuits normally held tion for reduction of shock and vi- mitted to "bottom" under severe open. They jump suddenly into ex- bration damage to electronic equip- shock; impact generates undesired istence when the shock acceleration ment. Soft copper braid could be high frequencies, with a peak accel- exceeds the holding tension. Shock used to conduct component heat out eration often exceeding that applied testing is useful even for equipment to the equipment "skin" without to the frame. Fig. 3 indicates the not required to function during conducting in vibration. proper shock mount stiffness and shock conditions, because unsecured range for various drop distances. connections can cause trouble after Shock Mounting The use of non -linear springs has a few months of corrosion and The high -frequency components been recommended to prevent im- loosening due to normal vibration. of shock and vibration can be re- pact.zl 3. Position or proximity effects duced by spring- mounting of the as- Shock testing can disclose the fol- (microphonics) producing a tem- sembly to the frame. The greatest lowing types of faults: porary change of characteristics vibration encountered by mobile 1. Weak mechanical design or con- during the shock. This effect is normally proportional to equipment is above 30 CPS, with a struction.24 The output of the equip- shock magni- considerable component extending ment is not necessarily monitored tude, but where it is due to loose down to 3 ers.32 Shock -mounting is during the shock; damage is dis- "fit" it may approach an upper limit analagous to low -pass filtering; the covered by subsequent inspection or as the motion becomes limited me- response rises to a peak at the re- test. The applied shock is severe and chanically. ("Tap " -testing is used sonant frequency and drops above it. somewhat destructive, and is recom- to detect microphonism in tubes.31) The resonant frequency should be mended on a sampling basis.35 chosen well below any anticipated 2. Intermittent connections due to Vibration Testing strong vibration frequencies. If oc- manufacturing errors can be discov- Sustained vibration affects equip- casional strong vibration at reson- ered at moderate, non -destructive ment differently than does shock, ance cannot be avoided, considera- shock amplitude by monitoring per - because: tion should be given to damping IS, 21 formance during shock. These can (1) With sine -wave excitation of the resonance. be loose connections normally held the frame, resonant parts can vi- "Soft- mounting" can do more closed by wiring tension, or acci- (Continued on page 118)

TABLE 1: Reliable and Rugged Tubes (Subminiatures not included)

Approx. Reliable or Approx. Reliable or Approx. Reliable or Prototype Rugged Type* Prototype Rugged Type* Prototype Rugged Type* 2C51 5670 6BA6 5749 7F8 Syl. 7F8W 2D21 G.E. 5727, RCA 2D21W 611E6 5750 12AT7 G.E. 6201 3B24 3B24W 6BH6 G.E. 6265 12AÚ7 5814, 6189 5R4GY Ray. 5R4WGY 6C4 6C4W, 6135 12AX7 5751 5Ú4G Syl. 5U4WG /5931 6L6 Syl. 6L6WGA/5932 12AY7 G.E. 6072 5Y3GT G.E. 6087, Hytron 5Y3WGTA 6J5 Ray. 6J5WGT 12J5GT Ray. 12J 5 W GT 5Z4 Bendix 6106 6J6 Ray. 6J6W, RCA 6101 /6J6WA, 6099 28D7 Syl. 28D7W 6AC7 G.E. 6134, RCA 6AC7W 65A7 Ray. 6SA7WGT 807 Syl. 807W/5933 6AG5 6186 6SJ7 RCA 5693, Ray. 6SJ7WGT None W.E. 421A Dual Power Triode 6AK5 5654, 6AK5W, 6096 651(7 G.E. 6137, RCA 65K7W W.E. 422A F.W. Rect. 6AL5 5726, 6AL5W, 6097 65L7GT RCA 5691, SyI. 65L7WGT 5686 Beam Pentode (9 -pin min) 6AQ5 G.E. 6005, Bendix 6094 (9 -pin) 6SN7GT RCA 5692, 6SN7WGT RCA 5690 F.W. Rect. 6AS6 5725, 6AS6W, 6187 6V6GT Bendix 5992 Bendix 5993 F.W. Rect. 6AS7 RCA 6080 6X4 G.E. 6202, Ray. 6X4W, Ray. 6187 Mixer (9 -pin min) 6AU6 G.E. 6136 Bendix 5993 (9 -Pin) G.E. 6203 F.W. Rect. (9 -pin min) 6X5 6X5WGT, Bendix 5852

TELE -TECH 8 ELECTRONIC INDUSTRIES August 1955 99 www.americanradiohistory.com Fig. 1: (Left) Rotating head magnetic tape reader. Studs on front hold reels, guide tape past drum

Fig. 2: (above) Interior mechanism. Connec- tions are made through slip rings and brushes

Rotating Reading Heads

Magnetic tape and wire used for external pulse storage in digital computer systems must be of exceptionally fine quality to ensure reliability of operation. This NBS- designed equipment provides a quick visual of holes, raised spots, or creases in the magnetic medium.

AREADING head that makes pos- for examining several different sizes clear picture of the playback signals. the close examination of a of magnetic tape or wire. The rotating head reading device de- sible a short section of magnetic tape or In the design and development of veloped at NBS provides such wire is now being used at the Na- magnetic tape and wire equipment repetitive method for examining tional Bureau of Standards to locate for external pulse storage in elec- tape. Once faults are located, they and investigate faults in magnetic tronic digital computer systems, one can be removed or else avoided in recording media. Developed by J. R. of the primary considerations has the future, thus increasing the relia- Sorrells of the NBS data processing been reliability of operation. An im- bility of the tape. laboratory, this instrument portant factor in magnetic storage is For convenience, the tape reader is systems 2). (Fig. 1) makes use of a reading head the condition of the tape surface it- mounted on a vertical panel (Fig. mounted on a rapidly rotating drum self. Errors in operation can be Near the two upper corners are the so that the head is in contact with caused by any of several types of shafts on which the tape reels are the tape for a part of each revolu- tape faults such as "holes" and raised mounted. Although tape must be tion. Since the tape is held station- spots in the magnetic surface, or reeled manually on the NBS model, ary, the head reads exactly the same creases in the tape. Very often the a motor drive or stepping mechanism set of signals once each revolution, loss of several pulses or the gain of could easily be attached. The idler and the playback can be displayed a single pulse may be caused by a shafts are friction loaded to maintain continuously on an oscilloscope and flaw that is too small to be visible to the proper tension on the tape for observed as long as desired. the unaided eye. Conventional means reading as the tape is reeled along. In addition to providing a means of tape reading are not suitable for Rotating Drum for closely examining the playback locating errors, since in the usual signals from a specific portion of the tape transport mechanism the tape is At the lower center of the panel is tape, the reader can be used to scan moved continuously past a station- the rotating drum on which the read- through and edit a complete tape. ary head. In investigating tape for ing head is mounted. The drum is The observer can easily locate any faults it is desirable to read a small 27/a in. in diameter and rotates at 10 defective signals along the entire specific portion of the tape over and rps; thus the equivalent tape speed length of the recorded tape. Inter- over again at a rapid rate, and to is 90 ips. The drum is made in two changeable parts provide a means display on an oscilloscope a steady, (Continued on page 144)

100 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Cut -Off Predictions Via Bandwidth Indexes, Improved Ladder Networks, and Suitable Wide Band Couplers, Aid Amplifier Design

Viewpoints on D- Amplifier Design

Part Two Of Three Parts By DR. HARRY STOCKMAN

OTHER variations of bandwidth in- represents the response v (t) in the a sloping transient with undesirable dexes may be developed to suit time domain overshoots. The slope of this tran- particular needs. The proper way of A (o) sient has a definite value, often ex- determining the cutoff frequency v(t) - pressed via the rise time tr; defined appears to be that of formal circuit 2 as the time required for the in- analysis, but this approach is far too CO stantaneous amplitude to go from difficult to be practical for ex- 1 A (w) sin [wt -cr. (w)] 10% to 90% of the peak value, the tremely- wide -band amplifiers. It is F dw, (4) Iimits here being considered 0 to of interest to consider as bandwidth xu w 100 %. The slope is described mathe- index the cutoff frequency, deter- matically by the time derivative of mined from the integrated area of where A(o) is the dc gain of the v(t) in eq. (4), and may therefore the absolute gain curve under the amplifier, and w = 2rcf the radian - be expressed by the ratio A (o) /tr, assumption of fixed gain. Before this frequency variable, which goes from or, if the rise time is inverted to a zero (dc) to, theoretically, infinity. approach is discussed, reference is frequency f.f f, by the product Thus, if made to the fact that the precise a constant- voltage battery A(o)f.fr. It is noted that we now value of the conventional 3 db cut- (representing the up- stroke step have formulated a new bandwidth off is not a reliable criterion of the function) is attached to the input index, or gain-bandwidth product, terminals, eq. (4) amplifier's transient response. The describes the de- and if the time derivation is carried advantage of the gain- curve -area layed output transient voltage; the step out on the right side of eq. (4), this method is that its particular cutoff function being degenerated into new bandwidth index becomes frequency definition takes into ac- CO count the transient response charac- Fig. 3: Defining concept of gain -areo- cutoff teristic of the amplifier to a much (5) greater extent than the 3 db cut -off frequency definition. The gain - A(w) curve -area method is therefore of where K contains the various factors A(o) 7 providing considerable interest to us, although co the proper proportionality this method requires that at least constant. The above equation simply one section of the amplifier be built ¡Mw) dw= ¡ =KIA(o)feff expresses the area under the abso- in the laboratory, so that its ampli- o lute -gain curve, see Fig. 3, and since cv this area equals the rectangular area tude response can be run off (which Weff is generally a simple matter, using (Continued on page 148) a signal generator and a vacuum - tube voltmeter). Fig. 4: Complete section of D- amplifier stage, including m- derived grid and plate lines In simplest possible presentation, the transient response of a wide - band amplifier is found by the application of a square wave, and the t t response to this square wave (its I pen+odei C step function) may be described by I fube I rrt Lk I m Lk o the Fourier Integral. Observed at mLk lnik I 9m I the output of the amplifier, this . 1 _,? I I I-m1.Lk Fourier integral is modified by the V+t_ Lk amplitude response A()) and phase 2m I I Ro Re4-- I a R. I R I grid V, response cp (w) of the amplifier, and al?. -- 2m }II ZM 2rnck uÿ plate p°sm3 2 tes Dr. Harry Stockman is senior physicist at Scien- tific Specialties Corp., (Subsidiary of Norden- Corp.), Boston, Moss.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 101 www.americanradiohistory.com New Avionic Equipment

TRANSDUCER COMPONENT RESISTOR ANNUNCIATOR The "Delta Unit," a new multi-pur- This new 1% resistor, called Polyohm, The new HCM 3/4 Universal Annunci- pose transducer component built around is ideal for use in aircraft, guided ator, small in size, light weight and the T -42 ionization transducer, provides missiles, and other applications where vibration resistant, is especially suited a ready -to -use unit for analog conver- high ambient temperatures rule out or- to aircraft use in such applications as sion of capacitance changes to voltage dinary 1% resistors. Performance ex- indication of rudder control, roll, and

rn/W

changes. Can be applied to the measurement of any physical phenomena that can be resolved into changes of ceeds all MIL- R- 10509A specifications others. It is a 1.3 ounce, 3/4" diameter capacitance, such as micrometric and and is capable of taking full power at D'Arsonval type indicator utilizing a macrometric displacement, angular ambient temperatures up to 120 °C. Even coaxial mechanism. Uses have been motion, vibration, temperature, pres- under high humidity, it remains well found for it in servo and control systems sure, liquid level, humidity, dielectrica, within its 1% tolerance. Its temperature as a flag alarm or miniature null indica- continuous weighing, etc. Sensitivity is coefficient is only -150 ppm / °C, which tor. It meets the vibration requirements is as high as 5 v. /µµf AC. Output is a phase lower than both the R and X char- of MIL -E -52 72A, Procedure I. Marion sensitive dc. signal as high as +60 v. acteristics. Polytechnic Research & De- Electrical Instrument Co., Manchester, Decker Aviation Corp., 1361 Frankford velopment Co., 202 Tillary St., B'klyn, N.H. -TELE -TECH & E.LECTRONIC N. Y. -TECH & ELECTRONIC Ave., Philadelphit, Pa. -TELE -TECH & -TELE INDUSTRIES. (Ask for 8 -43) ELECTRONIC INDUSTRIES. (Ask for INDUSTRIES. (Ask for 8 -31) 8 -26) BLOWER CONTROL TOWERS I -F AMPLIFIER This new subminiature centrifugal This line of portable aircraft control This series of subminiature I -F am- blower for cooling airborne electronic towers are transportable by truck, plifiers used in airborne radar systems equipment is designed and tested for helicopter, or cargo plane. Each unit and broadband receivers is available high altitude and high ambient opera- is complete tower in itself, including in three models, M1154 at 30 mc, M1155 tion and meets all applicable MIL a in interlocked two -position control of re- at 60 mc, and M1156 at 90 mc. Gains specifications. The blower, available motely located transmitters and paral- of over 100 db are obtained simultane- either rotation and in single or double - leled monitoring of remotely located ously with bandwidths over 12 mc at ended models, features a rotatable receivers, field lighting control facili- center frequencies of 30, 60, or 90 mc. metal blower housing. Air delivery of ties, and aerological instruments. Sec- Built to meet rigid military specifica- the single -ended blower is 13 CFM at 0" tionalized supporting structures are

s';y ';' `

available in any height up to 250 feet tions, they contain tubes having a rated static pressure (20,000 RPM) and 7 CFM and can be assembled without using life of over 5,000 hours. Unique design at 11,000 RPM. Utilizes a 1" diameter cranes or external machinery. Wickes provides complete shielding and ab- motor and is available in single or 3 Engineering and Construction Co., 12th sence of regeneration. Maxson Instru- phase for 400 cycle or variable fre- St. and Ferry Ave., Camden 4, N. J. ments, 47 -37 Austell PI., L.I.C. 1, N.Y. quency operation. Eastern Air Devices, TELE -TECH & ELECTRONIC INDUS- -TELE -TECH & ELECTRONIC IN- Dover, N.H. -TELE -TECH & FT.EC- TRIES. (Ask for 8 -42) DUSTRIES. (Ask for 8 -45) TRONIC INDUSTRIES. (Ask for 8 -46)

102 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com New Electronic Materials

SHAPES AND PARTS MICROWAVE ABSORBERS WIRE Electronic parts of intricate shapes ECCOSORB CH is a flexible, rubberized A new grade of molybdenum wire, and close tolerances can be accurately fiber for use in microwave darkrooms. especially developed for grids in molded from "Flurothene" and have Having a maximum energy reflection power and receiving tubes, known as superior strength and dielectric proper- of 2% at all angles of incidence, this "Moly -G," has improved mechanical ties over a temperature range to 710 °F. absorber enables indoor antenna properties obtained by small, controlled

Temperatures from -320 to +390°F. measurements. The material is light- amounts of cobalt added to a high have little effect on the properties. weight, easy to apply, and has a white purity molybdenum base. Tensil Makes fine insulators and parts for high surface. Three types -CH 460, CH 475, strength is about 45 grams per mg /200 frequency radio circuits. "Flurothene" CH 490 -are broadbanded within the mm. The ratio of yield to tensil strength can also be extruded coating, or cast following wavelength range, 0.5 cm.- is a maximum of 85 %. Elongation is into finished products by conventional 12 cm., 0.5 cm.-30 cm., 0.5 cm.-60 about 17% in 2 inches. Improvements processes with only slight adjustment cm. A second series, ECCOSORB HF, are minimized wire breakage on grid to standard machinery. Bakelite Co., for waveguide terminations and loads, winding machines. Fansteel Metal- Div., of Union Carbide and Carbon comes in standard rods, sheets, and lurgical Corp., 2200 Sheridan Rd., North Corp., 260 Madison Ave., New York 16, specified molded shapes. Each series Chicago, Ill. -TELE -TECH & ELEC- N Y.-TELE -TECH & ELECTRONIC member has different bulk resistivity, TRONIC INDUSTRIES. (Ask for 8 -67) INDUSTRIES. (Ask for 8 -65) Range, 50 to 1012 Ohm cm3. Emerson & Cuming, Inc., 869 Washington St., ANTENNA CORES LAMINATES Canton, Mass. TELE -TECH & ELEC- Three new grades of thermosetting TRONIC INDUSTRIES. (Ask for 8 -66) Standard size antenna cores, that are laminated plastics utilizing a DAP said to offer maximum economy and diallyl -phthylate resin base, DAP -im- greater quality uniformity are made pregnated canvas (Grade C -104), "Or- FERRITE of "Ferramic Q" that provides complete lon" (Grade 0 stability in respect to age, shock, vibra- -104), and woven glass The high Q cloth (G -104) ferrite, designated as tion, and temperature. The cores are are coded to filler ma- "M" material, is now in production. terial. Price wise, C -104 is the most available in five lengths of rods and The ferrite provides the answer to plates. F -125, rod, diam. 0.250 in. economical. Grade 0 -104 is outstanding most antenna rod problems. The mag- in NEMA ±0.015 in. F -214, rod, diam. 0.330 in. that after water immersion netic properties of the material are: tests, power factor and dielectric con- ±0.020 in. (Camber 0.011 per inch) Initial permeability at 1 MC /sec., 125. stant show very little change. Grade F -429, width 0.725 in. ± 0.025; thickness

G -104 has the best electrical properties Maximum permeability, 450. Saturated 0.125 in. ± 0.030 in. Lengths, 7.520 in. in the dry condition. "Orlon" DAP flux density, 3,300. Residual magne- ±7/32 in., 6.250 in. ± 3/16 in., 5.300 in., withstands continuous temperatures of tism, 1,050. Curie Point, 350. Voltage -±-5/32 in., 4.625 in., ± 1/8 in., 4/100 in. 225 °F., canvas 275 °F. and glass fabric resistivity, high. National Moldite Co., ± 1/8 in. Complete information avail- 325 °F. Synthane Corp., Oaks, Pa.- 1410 Chestnut Ave., Hillside 5, N. J. able at General Ceramics Corp., Keas- TELE -TECH & ELECTRONIC INDUS- TELE -TECH & ELECTRONIC IN- bey, N. J.- TELE -TECH & ELEC- TRIES. (Ask for 8 -68) DUSTRIES. (Ask for 8 -69) TRONIC INDUSTRIES. (Ask for 8 -70)

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 103 www.americanradiohistory.com New Western Test and

RESET GENERATOR MARKER GENERATOR DIGITAL OHMMETER Model 32 is a pulse generator of vari- The Model B4 -100 Marker Generator Essentially a self -balancing bridge able low frequency and low duty cycle and the B4 -200 Oscillator measure delay with the unknown resistance one arm of which resets the computer and provides line lengths, rise times, and time inter- the bridge. Balance is achieved by auto- a synchronized trigger for repetitive vals from a few millimicrosec. to tens matically adjusting a digital rheostat solution presentation on an oscilloscope. of µsec. The B4 -100 provides marker with stepping switches. Model D040 dis-

signals of 0.1 µsec. and 1 µsec. in either Frequency range 0.06 cps to 20 cps con- polarity. Accuracy is .01 %. The B4 -200 plays 4 digits accurate to 0.05% i- 1 tinuously variable. Outputs: To com- consists of a free -running blocking digit from 0.1 ohm to 1 megohm in 4 puter- Negative going pulse of about oscillator phase locked to the 1 µsec. ranges. Range is indicated by a lighted, 20v. amplitude with 12,000 ohm internal marker pulses. Together with a B -2A automatically located decimal point and impedance; To oscilloscope -positive fast Pulse Generator, can measure delay line by the symbol Q or kQ in the extreme pulse of 6v. amplitude to start oscillo- lengths to ± 2 millimicrosec. Ruther- right window. Average read time scope sweep. Donner Scientific Co. 2829 ford Electronics Co. 3707 So. Robertson approx. 1 sec. Electro Instruments, Inc. Seventh St., Berkeley 10, Calif. -TELE- Blvd., Culver City, Calif. -TFT.F -TECH Box S Old San Diego Station, San Diego, TECH & ELECTRONIC INDUSTRIES & ELECTRONIC INDUSTRIES (Ask 10, Calif. -TELE -TECH & ELEC- (Ask for 8 -1) for 8 -3) TRONIC INDUSTRIES (Ask for 8 -5)

OSCILLOSCOPES FREQUENCY METERS METER AND COUNTER All 1700 large screen oscilloscope mod- The Arga Models 401 and 601 Expand- Model WE -110 frequency meter and els can be installed in this modern coned Scale Frequency Meters are designed counter uses glow -transfer tubes and sole type cabinet. The console oscillo- for fast, accurate monitoring of fre- simplified circuitry to obtain a sensi- scope, utilizing a 17" rectangular tube, quency. Particularly, where a perma- tivity of 50mv. rms, and has an accuracy is especially designed for production nent record of frequency is required. of 0.1% nominal, ± one count. De- test setups where work can be placed Input voltage harmonics of 5% and in- signed for use with magnetic speed in front of the operator. Enables de- put voltage changes of ± 10% will not pickups, turbine flow meters, and vibra- tailed observation of data or complex cause errors in frequency indication tion pickups, to measure rpm, flow, and greater than ± 1k cycle for Model 401 or 1/4 cycle for Model 601. 401 base fre-

signals. Overall dimensions: height, quency 400 cycles, span ± 25 cycles; vibration frequencies. Response, 10 cps 427A3 "; width, 23%8 "; depth, 37 ". Elec- 601 base frequency 60 cycles, span ± 5 to 50 kc; max. indicated count, 10,000 tromec, Inc., Console Oscilloscope cycles. Price $305.00. Shasta Div., Beck- units. Power 40w., 105 -130v. 60 cps. Dep't., 3200 No. San Fernando Blvd., man Instruments, Inc. P.O. Box 296, Size 6 "x6 "x11 ", price $295.00. Westport Burbank, Calif. - TELE -TECH & Station A, Richmond, Calif.-TELE- Electric, 149 Lomita St., El Segundo, ELECTRONIC INDUSTRIES (Ask for TECH & ELECTRONIC INDUSTRIES Calif.-TELE -TECH & ELECTRONIC 8 -2) (Ask for 8 -4) INDUSTRIES (Ask for 8 -6)

104 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Measuring Equipment

DEKABRIDGE GALVANOMETERS DIGITAL VOLTMETER The Model 210 "Dekabridge" has two The first five "High- Performance" The Model 450 digital voltmeter pro- "Dekadials" that provide uniline read- series galvanometers break the "fre- vides rapid digital readout for analog outs to four places over the resistance quency barrier" and enable accurate computers. Operates as a self -balancing range 0 -12 megohms. The rheostat arm recording of dynamic signals up to 200 digital potentiometer with oil- immersed has a total resistance of 12,000 ohms. crs without amplifiers. New units are stepping switches. Life tested for 20

Resistance ranges 1,000 /1, are 100 /1, electrically interchangeable with CEC's million readings. Range, ±00.01 to 10 /1, 1 1 1 /1, /10, /100, and 1 /1000 making 7 -300 units, but feature extended fre- ± 99.99 v. dc. ±10 incremental Accurate to mv. steps of 0.001 ohms each quency response. It is said that no cir- Resolution, 00.01 v. Operation rate, available lowest 1 on the resistance range. cuit revisions are required to use these reading /sec. Input impedance, 1,000 Limit of measurement error on all instruments in existing test arrange- megohms. Required external reference, ranges is 0.1 %. Included in the struc- ments. Types are available for direct ± 100 v. dc. Model 450, for bench use, ture is a key for connecting battery connection to commonly used 120, 180, is 12% x 8% x 14% in. in size. and galvanometer Model in the wheatstone and 350 ohm strain gages. Consolidated 450L, for rack mounting is 5% x 19 bridge circuit. x Electro- Measurements, Engineering Corp., 300 N. Sierra Madre 141 in. Power source 115v., 60 c. Non - Inc., 4312 S.E. Stark St., Portland 15, Villa, Pasadena, Calif.-TELE -TECH & Linear Systems, Inc., Del Mar Airport, Ore. -TECH -TELE & ELECTRONIC ELECTRONIC INDUSTRIES. (Ask for Del Mar, Calif. TELE -TECH & ELEC- INDUSTRIES. (Ask for 8 8 -9) -7) TRONIC INDUSTRIES. (Ask for 8 -12)

VIDEO MONITOR MARKER -PULSER PULSE GENERATOR The Model ARM -13A video monitor A combined marker generator and Pulse repetition occurs only provides complete once dur- monitoring facilities pulse generator locks all outputs to- ing a line frequency cycle of the Model for broadcast station camera chains. The gether and provides jitter -free synchro- MP -85 pulse unit has generator due to its re- an "A" scope and an illumi- nization of output pulses, scope- marker fined circuitry. Circuit stages are cas- nated calibrated scale that enables di- pulses, and scope- synchronizing pulses. caded giving frequency rect measurement step -up ratio of the composite vid- Output and scope synchronizing pulses between the line frequency and eo signal height. A switch vary dis- enables two as to each other and to scope charge frequency of 1:800 to 1:1250. lines or two fields of video information markers. Output pulse width, 0.1 to 10 Eliminates all vacuum to be viewed tubes; replaces on the "A" scope. Separate µsecs. Amplitude, 0 to 100 v. Rise and the hydrogen thyratron, its pulse forming network plus the necessary power

high voltage power supplies are used fall time, 0.03 µsec. Delay, 0 to 1 µsec. supply of the conventional for the 10 -in kinescope magnetron and the 3 -in. (coarse), 0 to 0.1 µsec. (fine, calibrated). trigger circuit. Output "A" scope. The kinescope is power (X -band), a fiat - Synchronizing pulse width, 3 µsecs. 45 kw. Average output power (X- faced, tinted, aluminized CRT. Kay Amplitude, band), Lab, 5v. Brubaker Electronics, 36 _ 40 w. Magnetic Research 5725 Kearney Villa Rd., San 9151 Corp., Diego 12, Exposition Dr., Los Angeles 34, 200 -202 Center St., El Segundo, Calif. -TELE -TECH & Calif. ELECTRONIC Calif. -TELE -TECH & ELECTRONIC -TELE -TECH & ELECTRONIC INDUSTRIES. (Ask for 8 -8) INDUSTRIES. IN- (Ask for 8 -10) DUSTRIES. (Ask for 8 -11)

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 105 www.americanradiohistory.com New Electronic Test &

ELAPSED TIME METER OSCILLOSCOPE PANEL METER Model 7008 running time meter in- The Type 545 dc. to 30 Mc oscillo- Model 131 ruggedized panel meters dicates hours of operation up to 10,000 scope, in combination with the Type feature a positive watertight sealing hours on a dial -type face. Weighing less 53K /54K plug -in preamplifier, has ver- arrangement accomplished by an in- than 6 ounces, it has a power drain of tical- amplifier risetime of 12 mg /sec ternal locknut between the meter approximately two watts. Hermetically and passband of dc to 30 Mc at cali- mounting flange and the case barrel.

sealed to conform to military specifica- brated sensitivities of 0.05 v., cm. to 20 movement it is said to A miniaturized D'Arsonval tion MIL -I -7793 (AER), v. /cm. with 20 µµf input capacitance maximum accuracy (25 g) and vibration is used to provide meet military shock direct, 7.5 µµf with a 10x probe. The flux density Alnico in 60 cycle and stability. High requirements. Available a new CRT provides 4 cm. by 10 cm. of this for and en- #5 magnets are another feature version avionic equipment linear display. Calibrated sweep range Available in a variety of gine suppliers and is installed in many ac- instrument. is 0.1 µsec /cm. to 5 sec. /cm. with scales, ranges, and specifications. Model 400 cycle powered equipment. Diameter Has - curate 5x magnifier. amplitude 131 meters meet Signal Corps specifica- 11/2" by 23/y" long, offered in either level selection, automatic triggering, 20 tions Mil -M- 10304. DeJUR -Amsco front or back panel mounting. Haydon 1 Mc sync. Wide sweep -delay range, 45 -01 Northern Blvd., L.I.C. 1, Mfg. Co., Inc., Torrington, Conn. Corp., - µsec to 0.1 sec calibration. Range ac- N.Y. -TELE -TECH & ELECTRONIC TELE -TECH & ELECTRONIC INDUS- Inc., P.O. curacy within 2%. Tektronic, INDUSTRIES (Ask for 8 -52) TRIES (Ask for 8 -44) Box 831, Portland 7, Ore. (Ask for 8 -40) VISUAL MONITOR OSCILLOGRAPH SWEEP DRIVE The Model 20 dynamic visual monitor The PM -20 is a new unit for static or The Type 1750 sweep drive replaces combines 24 moving -spot, light -beam dynamic testing of all types of indus- point -to -point frequency analyses by galvanometers in one package and en- trial or aircraft equipment. Up to 71 using a mechanical hand that turns an ables simultaneous display of 24 separ- individual variables can be recorded oscillator dial back and forth. It is ad- ate electrical signals on a single ground on one oscillogram when combined with justable over a speed range from 1/2 glass screen. Use of low period galva- suitable transducers and amplifiers. A to 5 cps. The sweep is independently nometers and a long -path optical system wide choice of galvanometers, up to adjustable from 30 to 300 °. Flexible enables the presentation of signals up 6000 cps, provides flexibility of measure- couplings attach knobs or shafts. The to 120 CPS with only 0.24 ma. required ment. Exclusive features include: two drive also provides a sweeping voltage, for full -scale deflection. Spot intensity separate galvanometers mounts; a drive proportional to shaft angle, that applies is sufficient to permit photographing

photo panel displays or high incident system not using change gears to ob- to the CRO horizontal deflection plates. light viewing. Operates from 22 -28 v. tain the record -speed range of 4 -500 The Type 1263 -A amplitude -regulating ac /dc at 1.5 amps. Size 81/2 x 81/2 x 6 in. fpm; automatic shutter that closes as power supply provides cathode and Century Geophysical Corp., 1333 N. the 100 ft. record holder is released. plate power for oscillators and adjusts Utica, Tulsa, Okla. -TELE -TECH & G. E. Co., Schenectady 5, N.Y. -TELE- plate voltage. General Radio Company, ELECTRONIC INDUSTRIES. (Ask for TECH & ELECTRONIC INDUSTRIES 275 Massachusetts Ave., Cambridge 39, 8 -75) 8 -77) (Ask for 8 -47) Mass. (Ask for

1955 106 TELE -TECH & ELECTRONIC INDUSTRIES August www.americanradiohistory.com Measuring Equipment

COLOR BAR GENERATOR WATTMETER DC OSCILLOSCOPES A new combined color bar dot gen- The 641N calorimetric type r -f watt- The series VS -900B sensitive dc. erator, the ChromaDot, features vertical meter measures power from 0 -300 w. oscilloscopes have exceptionally low dc. sync and requires one connection to the with the precision of a primary stand- drifts due to chopper -stabilization of RF antenna or video amplifier. Provides ard. It can be used to check the ac- their vertical amplifiers. Guaranteed color bars and dots at video and speci- curacy of other types of r -f wattmeters drifts are less than 1 mv. after warmup

fied RF frequencies. Pattern produces and determine the actual output of an of 2 minutes. DC sensitivity is 700 10 color bars with progressive 30° phase r -f power source when its approximate µv /cm. Available in three models: VS- shifts from the color pulsed signal. Re- magnitude is known. The has 930 B, (700 µv /cm. ceivers unit an only) has sym- using I, Q, B -Y and R -Y Matrix accuracy of better than ±2% of full metrical push -pull input on its most systems can be adjusted from this sig- scale-using the calibration curve sup sensitive range. VS -940B, nal. - has sym- Video output-0.6v. P to P. into plied -over the frequency range of 0- metrical push -pull input on all ranges 75 ohms, 10v. P. to P. into 5K ohms. 3,000 MC. For more accurate measure- to facilitate elimination of common in- RF output-0.2v. into 75 or 300 ohms. ments, the meter can be calibrated by terference signals such Kay Electric as hum at high Co., Pine Brook, N.J. the user at dc or 60 cps. Required or low signal levels. VS -960B, has TELE -TECH - a & ELECTRONIC INDUS- power, 3 w., 105 -125 v, 60 cps. MC. built in "hushed transistor pre -ampli- TRIES (Ask for 8 -51) Jones Electronics Co., Inc., Bristol, fier" to increase ac. sensitivity. Volkers Conn. (Ask for 8 -49) & Schaffer Mfg., Corp., Schenectady, SPECTRUM ANALYZER N.Y. (Ask for 8 -50) This unit is designed to cover a fre- VTVM MICROWAVE POWER METER quency range of from 10 megacycles to The Volt -Ohmatic Automatic VTVM The new Model 430C provides auto- 16,000 megacycles without the use of eliminates the need for manually select- matic power readings from 1 /10th to 1.0 auxiliary heads or equipment. Designed ing the appropriate voltage or resistance mw direct in decibels or milliwatts and specifically with Klystrons completely before using the meter. Has automatic eliminated computations and adjust- eliminated and modern pencil triodes AC, DC, Ohms, Range and (DC) ments during measurements. Pulsed or used instead for better stability. All band polarity selection. During Automatic CW power may be measured on either frequencies are directly read on an il- Range Selection, the meter movement waveguide or coaxial systems. This in- luminated dial accurate to ±1 %. is disconnected from the circuit to pre- strument can be used with a wide va- Analyzer has been used in close prox- vent overloading. One probe is used for riety of bolometer mounts having either positive or negative temperature coeffi-

imity to a 5 megawatt radar trans- all meter functions. Ranges may be cients. Operation may be at 100 or 200 mitter without spurious responses and changed manually if so desired. Mul- ohms and power is read direct in milli - without sacrificing sensitivity. 25 in. tiplier switch in probe extends AC and watts from 0.02 to 10 mw or in dbm from high, 19 in. wide, approx. wt. 140 lbs. DC ranges to 1500 volts. Bergen Labo- - 20 to d- l0dbm. Accuracy ±- 5 %. Lavoie Laboratories, Inc., Morganville, ratories, Fair Lawn, N.J.-TELE -TECH Hewlett- Packard Co., 275 Page Mill Rd., N.J. -TELE -TECH & ELECTRONIC & ELECTRONIC INDUSTRIES (Ask Palo Alto, Calif. TELE -TECH & ELEC- INDUSTRIES (Ask for 8 -54) for 8 -53) TRONIC INDUSTRIES (Ask for 8 -71)

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 107 www.americanradiohistory.com New Western

DECADE COUNTERS DELAY LINE VACUUM RELAYS

Employs the new direct- reading EIT The XN -1 lumped -parameter 20 Available in 2PDT (Type RM2) and decade -scaler tube and weighs only 6 usec delay line has a rise time of 1.0 4PDT (Type RM4) models for switching to 8 oz. complete. Available in four usec. Impedance is 600 ohms. The unit antennas, pulse networks, and many types; 20kc, 40kc, 100kc, (offered with is hermetically sealed in epoxy resin, DC circuits. 24 v DC actuating coils or without an input- shaper circuit) and and operates through the temperature built into flanged bases. Vacuum en-

an output stage scaler at 10 cps, which range from -70 °C to 135 °C. Size, in- closed contacts rated at 12 kv. peak; can be used to feed a mechanical coun- cluding terminal lugs, 101/4 x 33ís current carrying capacity 10 amps. rms, ter. Octal plug construction for quick x 1r)í6 in. Complete data available at continuous. Contact resistance only installation and removal. Dimensions of The Gudeman Company of California, 0.005 ohms. Can withstand 18 kv peak all models 1% x 23/4 x 33íc, excluding Inc., 2661 South Myrtle Ave., Mon- test between contact terminals. Operat- tubes. Ransom Research, P. O. Box 382, rovia, Calif. -TELE -TECH & ELEC- ing time, less than 30 millisec. 41/2" San Pedro, Calif. -TELE -TECH & TRONIC INDUSTRIES. (Ask for 8 -13) long and 4" in diameter. Jennings Radio ELECTRONIC INDUSTRIES (Ask for Mfg. Corp., P. O. Box 1278, San Jose, 8 -17) Calif. -TELE -TECH & ELECTRONIC INDUSTRIES (Ask for 8 -16)

RECORDERS FILM EQUIPMENT AIRBORNE KLYSTRON The series 800 flight -test data mag- The Model S6 system of professional netic tape recorders are available in magnetic film equipment is operated The 3K3000LQ UHF amplifier klystron units designed to record two channels of from ac. sources or 24 v. batteries. The provides CW operation at 760 -980 Mc information on 1/4 in. tape to models studio production unit consists of three and delivers two KW power output intended to record 28 tracks on 2 in. 103/4 x 141/2 x 6 in. cases. One con- with a power gain of 1000 times and tape. Plug -in amplifiers enable record- tains a two -channel microphone pre- 40% efficiency. Containing a long -life ing pulse -width modulation data, high amplifier mixer with an announce oxide cathode, this forced -air -cooled accuracy transient information by microphone and buzzer system. A tube is of rugged ceramic and metal means of wide- deviation frequency second contains the recording amplifier, construction. The resonant cavities are modulation, or wide band direct data, playback amplifier, and power supply. external to the vacuum system, which

including mixed RDB/FM subcarriers. A third contains the film transport or is free of RF circuitry, enabling wide - The typical Model 807 records 7 in- sprocket. One S6 system is contained in range tuning, easily adjustable input formation tracks on 1,<2 in. tape. Con- a single case. Available for 16 or 171/2 and output coupling, simple installation sists of five cable -connected units. mm film. Stancil -Hoffman Corp., 921 and maintenance. Priced at $2360.00. Ampex Corp., 934 Charter St., Redwood N. Highland Ave., Hollywood 38, Calif. Eitel- McCullough, Inc., San Bruno, City, Calif. -TELE -TECH & FT.FC- TELE -TECH & ELECTRONIC IN- Calif. -TELE -TECH & ELECTRONIC TRONIC INDUSTRIES. (Ask for 8 -18) DUSTRIES. (Ask for 8 -24) INDUSTRIES (Ask for 8 -15)

108 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Electronic Equipment

VOLTAGE REGULATORS GERMANIUM POWER TELEMETERING RECTIFIERS TRANSMITTER A typical unit of a line of magnetic amplifier voltage regulators built to Three styles of diffused junction The XT -1 telemetering transmitter, customer requirements has the follow- germanium power rectifiers -natural designed for higher powered data trans- ing specifications: AC input, 120 v. and forced convection, and liquid - mission in guided missile and aircraft single phase, 400 cycle. V. A. rating, cooled are recommended for ac to dc telemetering systems accepts modulat- power conversion where high power ing signals between 900 and 100,000

1020 401800 bi :

b r ,fir 50; DC output, 15 -150 v. at 0.05 -0.500 amps. to fields of exciter. Voltage ad- output, efficiency, non -aging and small cycles. Provides 8 w. power output, 215 justment ±10 %. Regulation accuracy, size are required. By careful selection to 235 lac frequency range; direct ±1 %. Dimensions, 13 x 11 x 10 in. of junction characteristics and circuit crystal control with a better than 0.03% Weight, approx. 35 lbs. Connections, design, and connecting junctions and precision. Output impedance 50 ohms. terminal strip. Has adjustable over - assemblies in series or parallel, ger- Frequency modulation, 150 kc devia- voltage cutout relay to shut off motor manium junction rectifiers can be sup- tion. Frequency response, flat within should excessive alternator voltage de- plied for voltage ranges from 10 v. to ±1 db. Harmonic distortion less than velop. Perkin Engineering Corp., 345 100 kv. and from 10 amps, to 100,000 1 %. Video input impedance, 50,000 Kansas St., El Segundo, Calif.-TELE amps. International Rectifier Corp., El ohms. Weighs 60 oz. West Coast Elec- TECH & ELECTRONIC INDUSTRIES. Segundo, Calif. -TELE -TECH & ELEC- tronics Co., 5873 West Jefferson Blvd., (Ask for 8 -22) TRONIC INDUSTRIES. -(Ask for 8 -20) Los Angeles 16, Calif. -TELE -TECH & ELECTRONIC INDUSTRIES. (Ask for 8 -19) CURRENT PROBE TV CAMERA PEDESTAL FILM AND SLIDE SYSTEM Model 91129-1, a new RF current The "PD -7" is adapted to the small studio, or can be The new Vidicon Film and Slide Sys- transformer of the inserted primary used as an auxiliary tern provides two film projectors, a type, has a nominal output impedance mount in larger studios. Weighs only 140 lbs. and slide projector and an optical multi- of 50 ohms. The probe consists of two will pass through a 30 -in. plexer. It contains a high sensitivity semi- circular, hinged, insulated wind- door. Maneuvers by two types of steering: "parallel," vidicon camera of extremely low noise ings on a hypersil core. By opening the whereby the three level wheels are locked in and extended dynamic range. The probe, the conductors may be placed parallel to turn system also contains a camera control in its center and when closed, a locking in any direction together; "tricycle," whereby unit with dynamic focusing, aperture arrangement holds it. The unit can be steering is done with the rear corrections, and keyed wheel, while the front black level used from 20 cps to 25 me. Especially wheels are clamps. The projectors have 120 -cycle

designed for use with the Stoddart locked in parallel. Raises or lowers shutters with long application time, pro- NM -10A and NM -20B Radio Inter- from 34 to 55 inches by the column viding flicker free reproduction. High ference Field Intensity Measuring handwheel. Houston Fearless Div., sound level output of 7mv. across 150 Equipment. Stoddart Aircraft Radio Co., Color Corp., of America, 11805 W. ohms is provided. Kay Lab, 5725 6644 Santa Monica Blvd., Hollywood, Olympic Blvd., Los Angeles 64, Calif. Kearney Villa Rd., San Diego 12, Calif. Calif. -TELE -TECH & ELECTRONIC -TELE -TECH & ELECTRONIC IN- -TELE -TECH & ELECTRONIC IN- INDUSTRIES (Ask for 8 -14) DUSTRIES.-(Ask for 8 -21) DUSTRIES (Ask for 8 -34)

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 109 www.americanradiohistory.com New Electronic Products

CAPACITOR TUBE SOCKET SILICON DIODES The new and improved West -Cap This is a new 7 pin steatite insulated Four new silicon diodes Types 650, vertical mounting type capacitor is de- tube socket designed for popular new 651, 652, and 653 feature extremely small signed for circuits with critical require- VHF septar based tubes such as the RCA breakdown voltage temperature co- ments in high vibration and low weight 5894, 6524, and the Amperex 5894, 6252. efficients from -55 °C to +150 °C. The limits. It is a metal- cased, hermetically It requires ?" less chassis mounting units maintain accurate reference in-

sealed with glass to metal type termi- space than previously available types definitely regardless of variation in nals, paper dielectric, temperature range and has an integral ventilated shield moisture, altitude, or other environ- from -55 °C to ±125 °C and conforms base which submounts the tube for mental conditions. They have a reverse to military specification Mil- C -25A. optimum input and output shielding. breakdown voltage (measured at 5 ma) Available up to 1000vdc in capacity rat- The socket will permit more compact from 3.7 to 8.0 volts. Total power 150 ings from .001 mfd to 6 mfd with either equipment design in mobile, aircraft, mw at 25 °C and 40 mw at ambient axial wire leads or spade type terminals. and other types of transmitting equip- temperature of 150 °C. Max. average Designated as type A, AA, AAA. San ment. E. F. Johnson Co., Waseca, Minn. rectified forward current from 90 -125 Fernando Electric Mfg. Co., 1509 First -TELE -TECH & ELECTRONIC IN- ma at 25 °C. Texas Instruments Inc., St., San Fernando, Calif.-TELE -TECH DUSTRIES (Ask for 8 -32) 6000 Lennon Ave., Dallas, Tex. -TELE- & ELECTRONIC INDUSTRIES (Ask TECH & ELECTRONIC INDUSTRIES (Ask for 8 -30) for 8 -37) STANDARD RATIO CHASSIS UNITS TRANSFORMERS CAMERA AND PEDESTAL This is a new type of expandable The PT Series consists of nine rack Mounted on the camera head are a chassis designed for laboratory bread- mounted and case models of precision field lens and a highly efficient color fil- board use. Almost any size and shape ac voltage dividers with accuracies to tering system, consisting of two full- sil- of chassis may be assembled by using 0.005% and resolution to 0.00001 %. vered mirrors, two dichroic mirrors, and the various parts offered in the patented Models are available to cover frequen- individual color filters for each channel. SeeZak line. Included are such items as cies from 30 to 3,000crs -to 10,000 crs Adjacent to each camera tube is a four - side and end rails, tops and bottoms, at reduced accuracy. Four new rugged - tube preamplifier with a cascode con- rail extenders, pre -punched prototype ized versions of standard ratio trans- nected input stage followed by a feed- panels, and rail feet. Unique angles can formers have heavy silver rotary back output amplifier. The camera ped- be worked out to meet requirements switches for use where severe continu- estal contains the sweep chassis and the

o ro .51" - ,c . O . . .. ._ ... . p

during wiring. Punching, drilling, and ous service is required. Used for core junction panel for interconnecting insertion of hardware may be done in material investigation, ac meter calibra- cables. Both camera and pedestal are the flat as breadboard work progresses tion, checking resolvers, servos, etc. part of the GPL Three -Vidicon Color U M & F Manufacturing Corp., 10929 Gertsch Products, Inc., 11846 Mississippi Film Chain, Model PA -520. General Vanowen St., N. Hollywood, Calif. - Ave., Los Angeles 25, Calif. -TELE- Precision Lab., Inc., Pleasantville, N.Y. TELE -TECH & ELECTRONIC INDUS- TECH & ELECTRONIC INDUSTRIES. -TELE -TECH & ELECTRONIC IN- TRIES (Ask for 8 -33) (Ask for 8 -41) DUSTRIES (Ask for 8 -56)

110 TELE -TECH a ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com CINCH STANDARD SOCKETS

The CINCH Sub -miniature socket insures positive electrical contact, holds tubes securely in place, permits easy maintenance and replacement, yields maximum insulation resistance and minimum high frequency loss. And provides manufacturers of electrical controls, transmitters, receivers, transceivers, airborne equipment,

etc., and hearing aids ... a labor saving chassis installation which serves terminal Five pin stem type for mounting tubes parallel to chassis and for printed board functions circuits. (shown enlarged) while permitting designers to obtain maximum space afforded by the standard flat base tubes.

* SUB -MINIATURE SOCKET FOR "SAVINGS" AND CONVENIENCE IN PRINTED CIRCUITS AND *AUTOMATICALLY

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CINCH is producing exactingly made components for the exacting requirements of mechanical assembly, automatically made with precision metal and insulation components, insuring the CONSULT CINCH uniformity and quality mandatory for use in AUTOMATION in the end users equipment. CINCH MANUFACTURING CORPORATION CINCH will design new, or redesign, 1026 South Homan Ave., Chicago 24, Illinois parts within the category of their manufacture to fit your Subsidiary of United -Carr Fastener particular Corporation, Cambridge, Mass. plans, and will also assist in the intro- duction in the assembly of CINCH's specially designed component in your CINCH components fully perform the radio and TV equipment. service for which they were designed, so that

judged by demand and usage, "CINCH is the CINCH components are available at leading elec- Standard ". tronic jobbers- everywhere.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 111 www.americanradiohistory.com ,_,Trerial WASHINGTON iffi ¡IA cettei Latest Radio and Communications News Developments Summarized by TELE- TECH's Washington Bureau

MORE TV SPACE -Reallocation of the spectrum for TV DE- INTERMIXTURE- Determination of future television, primarily, with the possibility of providing of uhf television in competition with vhf video opera- three more VHF television channels in the 88 -108 tions in question which FCC faces this fall after its megacycle FM broadcasting band is now under study August recess. Issue of de- intermixture was brought to by two highly qualified radio -tv engineering groups the forefront in two -day oral argument before the en- working with the Senate Interstate and Foreign Com- tire FCC on five cities, four with no vhf station on the merce Committee and the FCC. Recommendations from air and the fifth with a single vhf station operating. The the two groups -an ad hoc engineering committee decision on this proceeding can have an important bear- named by Chairman Magnuson of the Senate body and ing on contention of uhf interests that in 23 areas among the Joint Television Advisory Committee which has 100 top markets existing uhf stations should be "pro- been aiding the FCC -are slated to be completed this tected" from competition from vhf operations. The con- fall. JTAC has asked the Commission to institute with troversial situation has precipitated the thought of a its coordinated assistance a long -range study of fre- 90 -day "freeze" on the new uhf station grants until quency utilization so as to obtain the optimum use of the policies are delineated. channels, including spectrum requirements of the armed services and the other government agencies such as the Civil Aeronautics Administration. MOBILE RADIO GROUPS -Two types of organizations to work with the FCC Commissioners and staff ARRAY OF EXPERTS -The makeup of the two on problems and policies affecting the mobile radio groups which were designated to formulate the recom- services have been recently proposed. One was for the mendations for the survey of spectrum reallocation formation of an interservice safety-special mobile users program constituted virtually the top -level stratum of association which would present a united front on the radio -tv engineering and frequency authorities. The maintenance of private industrial frequency allocations ad hoc group, headed by MIT professor Edward Bowles and operations and also have a voice in the selection and consultant to Raytheon president Adams, comprises by the Commission of department heads dealing with such leading engineers as Dr. Allen B. DuMont, Philco the safety- special radio services. The other was the research director Donald Fink, IRE secretary Haraden establishment of a Radio Technical Commission for Pratt, Westinghouse engineering vice president Ralph Land Mobile Services, patterned like the radio tech- Harmon and CBS engineering vice president William nical commissions for aeronautics and marine services. Lodge. The JTAC body handling the study are RCA The latter was presented by Motorola communications - frequency bureau chief Philip Siting, Bell Labs' Dr. electronics Vice President Daniel Noble, a leading au- Ralph Bown, and I. J. Carr of GE with Lloyd Berkner thority in the mobile radio field. of Associated Industries as chairman. PAY -SEE TV-After the first influx of large support PROTESTS ECONOMIC -That the Section 309 (c) for pay -see television in letters to the FCC and to lead- of the Act Communications which requires the FCC ing newspapers, the views of the vocal public on this to hold hearings on economic protests to new radio -tv issue have become reversed and now the preponder- grants and to stay new authorizations pending the de- ance is in opposition to this plan of operating video termination of the protests should be greatly delimited public service. The majority of the public- three- or was repealed advocated by two leading FCC mem- fourths in the largest city, New York-opposed the bers in hearings before the Senate and House com- payment idea for TV programs, while the remaining mittees. There 70 are cases of radio and tv stations now fourth favoring the method generally had qualifications held up for decision because of the legislation and this as to amount of fee and types of programs specially work consumes 28% of the Commissioners' time in meet- desired. This current trend is felt to lighten the pres- ings and the staff in one month spent 2404 man hours sure on the FCC for approving this method of televi- costing around $49,000 on these protests. FCC Chairman sion in a speedy carte blanche authorization. George C. McConnaughey urged the FCC have dis- cretion on accepting such protests, while Commissioner John C. Doerfer advocated outright repeal of the section. Whether Congress in its final legislative lap acts on solution of this situation was not predictable at National Press Building ROLAND C. DAVIES TELE- TECH's deadline. Washington, D. C. Washington Editor

112 TELE -TECH a ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com True color ... high definition yours with GPL's 3- Vidicon Color Film Chain

Telecast stable, 600 line color pictures of unmatched quality with the outstanding 3- Vidicon Color Film Chain recently developed by GPL. Typical GPL performance superiority has been achieved in this equipment with a highly advanced color filter system, precise regis- tration, precision- engineered GPL components, and factory -adjusted optical and mechanical alignment. Compactness of the chain permits easy installation into your present monochrome film layout. These and the many other outstanding features of this chain will make color film telecasts a profitable feature of your station. Ask GPL engineers to show you how.

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A SUBSIDIARY OF GENERAL PRECISION EQUIPMENT CORPORATION

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry www.americanradiohistory.com card on last oaae. 121 CUES for BROADCASTERS Practical ways of improving station operation and efficiency

Magnetic Tape found that the magnet caused a the time -check compares by wrap- Threader thump on each turn, decaying with ping tight layers of adhesive tape each turn until at the 25 second around the tape drive wheel. (Cap- JOSEPH F. LANG point the thump disappeared. stan) WJR, Detroit, Mich. In this way, the problem of thread- However, if the time -check at the ing tape on a take -up reel was recording location plays back under ONE of the most time consuming solved without resorting to ad- 60 seconds, bring the tape up to operations in using a tape re- hesives, special leaders, or the old speed before recording by wrapping corder is the act of threading the method of making a loop of the the adhesive tape around the cap- tape on the take -up reel. It takes tape. stan. Remove the adhesive tape for only a few seconds but multiplied normal studio playback. by a hundred or so times, it can add While only emergency measures, many unproductive minutes to the these methods can save a program recording day. However, the time that might otherwise have been lost. element is considered small com- Remote Recording Aids pared to the ease with which the tape is spooled on the reel, and the TACK THORNTON frustration spared the engineer by 733 Georgia Ave., Bend, Ore. Rapid Replacement of Tubes the method described below. This KEN MAXWELL method words satisfactorily if one MANY radio stations have occa- Ch. Eng. KLTI, Longview, Texas condition is observed. You must use sion to make tape recordings at at least a thirty second lead -in on summer camps, emergency areas, MANY commercial consoles, lim- the recording, which I might add is parades, or other locations away iter amplifiers and other compli- standard practice at our station. from regular power lines. When tak- cated pieces of equipment have a A standard NAB hub was re- ing power from portable generators front panel selector which meters the worked, and where the tape is nor- or "home light plants" it is some- voltage across the cathode resistor. mally threaded, a circular plastic times found that recordings are not In case of failure of the piece of insert was added. In this plastic the proper speed for normal studio equipment while it is in operation, playback. Often there is no fre- the meter selector can quickly in- quency meter on the generator. A dicate if any tube has an open fila- simple check can be made before re- ment or other trouble causing a cording, and with many recorders a great vibration from its usual plate quick adjustment made even if the current. The next step is to try to generator cannot be corrected. locate the manufacturer's manual Before leaving the studio or trans- about the console, amplifier or mitter, record a one -minute time - limiter and find the proper page check calling off the start of the which tells which tube is indicated check and then the last ten seconds by position 9, for example. In order of the minute second -by- second. At to save this loss of time in identify- the remote location -after determining the tube indicated by the selec- ing that the available current is a.c. tor switch the numbers on the -play back the time -check. Any selector switch were typed on a playback over 60 seconds indicates piece of paper and "scotch" taped a slow- running generator. (The beside the tube socket they repre- number of seconds over 60 showing sented. It now takes only a few Magnet imbedded In reel holds tape in place the number of cycles -per- second the seconds to locate the defective tube. generator is slow.) Playbacks under This idea originated in a piece of 60 seconds similarly indicate a fast - equipment which was wired differ- insert was put (press fit) a small bar running generator. Thus the speed ently from the chart in the instruc- magnet (taken from a kitchen black- error can be corrected by speeding tion manual. It seemed so useful that board which has little magnets to or slowing the generator until the it was repeated with all other hold notes). time -check is accurate. equipment in the station. By positioning the bar magnet so If generator adjustment is not pos- that the tape will come in contact sible, tape machines having exposed with it, it was found that the tape drive capstans can be adjusted in could be held in place on the hub many cases. If the time -check play- $$$ FOR YOUR IDEAS with enough force to enable the back is under 60 seconds go ahead Readers are invited to contribute their operator to wind a few turns on the and make the recording, erasing the own suggestions which should be short recording and include photographs or rough take -up reel. original time -check and a -spaced one in sketches. Typewritten, double Next, tests were run to determine new before the program. Back text is requested. Our usual rates will the effect of the magnet on each the studio the tape will playback be paid for material used. succeeding turn of the tape. It was slow. Bring it up to a speed where

114 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com NOW. . . tbe4lPpúrp ose 'Scope by WESTON WAVEFORM ANALYSIS

Response curves accurately displayed. Ideal for use with Weston intensity marker display. A fast, retrace sweep circuit with cathode follower output prevents pattern distortion.

SQUARE WAVE RESPONSE

ll Weston Iy1lil1' Model 983 Oscilloscope lai Overshoot is only 2 to 5 %. Rise Time is 0.1 Microsecond. Square wove de- picted 250 kc.

PHASE MEASUREMENTS Model 983 is a high gain, wideband Oscilloscope designed to accurately reproduce waveforms comprising a wide band of frequencies. High sensitivity of 15 millivolts per inch RMS makes this "scope ideal for - SETTING RESONANT TRAPS ... SIGNAL TRACING IN LOW LEVEL STAGES ... AS A GENERAL NULL INDICATOR ... for PHASE CHARACTERISTIC MEASUREMENT IN INDUSTRIAL APPLICATIONS...and for SWEEP FREQUENCY VISUAL ANALYSIS. The 'scope contains identical vertical and horizontal push -pull amplifiers with a choice of AC or DC coupling without affecting either sensitivity or band width. Both amplifiers have compensated step attenuators and Phase shift between horizontal- verti- cal amplifiers, 0 -500 kc 1 mc cathode follower input. It has excellent square wave reproduction -0 °, to with within 2 °; by internal adjustment overshoot of only 2 to 5 %, with a rise time of 0.1 microsecond. The with gain controls at max 0° phase 'scope response is essentially flat throughout the specified range of 4.5 mc shift possible on any specific fre- and is usable to 6 mc. quency to 6 mc. The unit has provisions for internal calibration, internal phased sine wave, and Z -axis intensity modulation. Reversal of polarity of both horizon- RESPONSE CHARACTERISTIC tal and vertical signals is easily accomplished by means of toggle switching. Tube replacements are non critical, and etched circuitry facilitates quick and rapid maintenance. The Model 983 Oscilloscope is now available through local distributors. For complete literature write WESTON Electrical Instrument Corporation, 614 Frelinghuysen Avenue, Newark 5, New Jersey.

Note flatness throughout specified range; to 3.6 mc down 1.5 db, at 4.5 WESTON 710 mc down 3 db, at 6 mc down 6 db.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product Information, use Inquiry card on last page. 115 www.americanradiohistory.com Improving Communications in TV

External program line amplifiers provide effective liaison between television broadcast station personnel

Fig. 1: External program line amplifiers

WE use RCA TS -30A field By WILLIAM H. COLE phones is furnished through a di- switching equipment in both Technical Operations Staff vider in the plate supply. our local station and network mo- National Broadcasting Co. We use three- circuit Cannon fit- bile units. This gear provides good Hollywood, Calif. tings for our field audio cables communications under normal con- the Technical Director, his camera (mike extensions, etc.), so this type ditions. However, there are occasions and video men. This allows us to connector was the logical choice for when more than the normal com- maintain the highest communication the amplifier. The only requirement plement of personnel are required to level possible with our unmodified is that there be three circuits inter- produce and engineer a program. switchers, eliminates cross -talk and connecting amplifier and headsets. Hence, program line or "PL" cir- relieves our cameramen of the pro- This allows us the use of our regular cuits become overloaded, resulting gram PL's that would be normally microphone extensions for this pur- in loss of volume. Inherent cross- plugged into their cameras. An pose, and thousand -foot lengths have talk, when both program and engi- adaptor, to be described later, may been used with negligible loss and neering circuits are in use, contrib- be used in conjunction with one of no trace of inductive feedback, even utes to confusion of directions. Then, the amplifiers to further reinforce though input and output leads are too, there are times when the nature the director's voice under adverse enclosed within a common shield. Of of the program is such that much conditions. course, adaptors are used to join the greater communications levels are Each PL amplifier provides ade- headset's Tip, Ring and Sleeve plug required to over -ride a loud orches- quate gain for up to twelve Western with the Cannon connector. tra or cheering crowd. And, in Electric type 52BW headsets. The The photo of two of the amplifiers many cases, a third and fourth cir- amplifier is a push -pull stage, using (Fig. 1) gives an idea of part place- cuit, for lighting and audio crews, inexpensive, readily available parts. ment and shows the bottom plate must be provided. Using the standard components with circuit diagram and parts list Through the use of external PL listed, the amplifier, measuring cemented to the inner face. We amplifiers (see Fig. 1) to be de- 4 x 5 -1/2 x 8 in. and weighing 6 lbs., usually run one microphone exten- scribed, we now reserve the built -in is quite portable. As shown in Fig. 2, sion from each amplifier to the facilities of our field switchers for "battery" for the carbon micro- (Continued on page 124)

Fig. 2: Circuit diagram and parts list for push -pull external program line amplifier. Unit provides gain for up to 12 headsets

6SN7

RI JI 3GKT FLUSH RECEPT. CANNON P3-13 J CI J2 " ó 2 J3 TRS JACK W. E. 238A 0 RI 500K VOL. CONTR. IRC P013-133 J2 " o R2 " " IRC MI3-133 o R3 8 R3 IK, I /2W OHMITE IOX 5 R4 5K, IOW TRU-OHM WIRE IR2 R5 10K, IOW CI IONF, 25V CORNELL DUBILIER BR 102A C2A40,uF 450V J3 " UPT4445 C28 " II R4 I R5 C3A " C2A C2B T3 C38 " " H TI MIKE TO PP GRIDS STANCOR A4742 L ll( T2 PP PLATES TO VC A3856 6X5 C3A = T3 230V, 50MA PWR " PC8418 8 CHI 7HY, 50MA " CI707 3 X SI OPST N.O. SWITCH IRC 76-2 2 C3B FI I AMP FUSE LITTEL FUSE 342003 (HOLDER) II 6V PILOT DIALCO 8108-431 (ASSEMBLY) 5 k 7

116 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com to simulate free space for microwave antenna testing

Westinghouse uses the new A "free space" room At Westinghouse Electric Corporation's Air Arm Division in Baltimore, the problem was to produce a large room which would simulate free space conditions for microwave testing to be done in conjunction with environmental testing. The McMillan "free space" unit illustrated above was especially designed in association with Westinghouse to fit this particular need. McMillan supplied a "modular unit" consisting of the individual structural -steel channels, or ribs, together with the microwave absorber panels. It was a simple job for Westinghouse workmen to form the construction and mount the panels. In this installation, McMillan Hair Mat, type H -4 was used on the wall and ceiling panels for its light weight, while the floor panels utilized McMillan Plastic Foam Block, type B which can be walked on without affecting its electrical performance. All absorbing materials were backed with copper shielding to prevent R.F. disturbance from outside. Panels were approximately 4' x 8'. The complete front section (right hand section of illustration above) which includes the door, was mounted on roller casters to allow large equipment to be moved in and out. McMillan can produce any size room on this "modular" principle, with whatever type microwave absorber may be required -for either indoor or outdoor use. Send for catalog.

INDUSTRIAL CORPORATION 27 BROWNVILLE AVENUE IPSWICH, MASSACHUSETTS

VE LE-TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. r r www.americanradiohistory.com 7 Electronic Reliability (Continued from page 99)

(1) With sine -wave excitation of the frame, resonant parts can vi- brate at much larger amplitude than over seven million. the frame. Since electronic equipment (including tubes) consists of large numbers of parts in a hier- archy of assemblies, it is quite possible for a mode of resonance in a small part to coincide with a mode of resonance in the assembly upon THERMADOR which it is mounted, thus experi- encing near the mutual resonant frequency a vibration amplitude several hundred times as great as that applied to the frame. (2) Vibratory energy can be dissipated in a gas or liquid without harm to the equipment, but that transformers portion that is dissipated in solid materials should be suspected as destructive until proven otherwise, since it normally implies super - elastic strain, abrasion, sawing, loosening of fasteners, etc. This in use the world over! damage occurs on every cycle during vibration but only once per shock. For these reasons, sinusoidal vibration is applied at very much lower peak acceleration than the shock endurance capability of the same equipment. Hence vibration is less sensitive for detection of ulti- When you need transformers - subminiature or large, mate strength, intermittents and from stock or engineered and built to your own exacting microphonics than is a higher -amplitude shock, except at resonant specifications, it will pay you to call on Thermador. frequencies. Vibrating to destruction on a sampling basis can be valu- Thermador transformers of every size, for every purpose, are used by able, 31, ss although correlation with industry and government in a wide range of applications. service life is difficult to establish What Thermador has done for these users, we can do for you, what- because the vibration encountered is sinusoi- ever your transformer needs. Thermador transformers exceed your in actual service seldom dal or even well- known.39 Swept - own specifications and MIL requirements. frequency vibration at very low Thermador is the only manufacturer on the West Coast with every amplitude can be useful as a pro- facility for making transformers, magnetic amplifiers and voltage regu- duction test; an abnormal spectrum lators under one roof -from engineering to manufacturing to final of resonances may indicate inadequate clinching of essential fasten- laboratory test. ers or partial structural failure. Technical consultation is available without obligation ... Write, phone or wire Thermador today. Vacuum Tubes The reliability and environmental testing of electronic components is presently receiving much attention Visit the Thermador Electronics Division exhibit in and effort by the military services and their contractors. Vacuum Booth 827 at the WESCON show in San Francisco's tubes should, and do, receive a large Civic Auditorium, August 24, 25 and 26. share of this attention. The development of long -life tubes is necessarily slow because prove -in of new techniques by life- testing takes so long. ( "Ruggedized" tubes may or Electronics Division, Dept. TT -855 may not have extended life in quiet W THERMADOR ELECTRICAL MANUFACTURING CO. service. Preliminary reports indicate that they usually do, but this 4 2000 South Camfield Avenue, Los Angeles 22, California opinion is not unanimous.) Incan- 8 "Seven Leagues Ahead" PArkview -2105 3 -1030 descent lamp failure frequency in-

118 For product information, use Inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Typical current Amplification characteristics 25 Checked against similar types Sylvania's Power Transistor consistently provides higher current gains.

1.0 1.2 1.4 1 5 Emitter Current, (amps) le Shown Sylvania NPN Power more than twice the Transistor 2N95 Exhibits actual elze

iicP0m You compare Check the Sylvania 2N95 against similar Transistor types yourself - for current gain as well as all of these 3s important power Transistor features. : Does the Sylvania 2N95 offer- answer Q perated at 1.0 amp emitter -cur- bines all the important features you 1. lower cost yes J rent, the Sylvania 2N95 Transistor want in a power transistor, whatever 2. low input impedance typically provides a current gain of your application. If, for example, yes J 3. low thermal resistance 17 ... 3 % times that of comparable yours is a switching application, the yes J types A and B. Even at 1.5 amp 2N95 offers high gain at high currents. 4. high current switching yes J emitter current the 2N95 typically Designed for low thermal resist- 5. high current gain yes J exhibits a high gain of 13 ... in fact, ance, the Sylvania 2N95 Transistor 6. mounting for air cool as the curve shows, the Sylvania provides dissipation up to 2 % watts or heat sink yes J 2N95 provides the highest gain over without an external heat sink and up 7. hermetic seal yes J the widest range of operating current to 4 or more watts with a suitable A smaller version for heat sink mount- conditions. heat sink. This insures stable opera- ing, the Sylvania 2N102 is also avail- In addition, Sylvania's 2N95 com- tion in high ambient temperatures. able with the above features.

"another reason why it pays heck your application for complete data on other ISylvania Transistors to specify Sylvania" High gain, low frequency High power, low frequency Types 2N34 and 2N35 Types 2N95 and 2N68 I High frequency Types 2N101 and 2N102 Types 2N94 and 2N94Á 'Dept. H4OR Sylvania Electric, 1740 Broadway, New York 19, N.Y. SYLY N I Name SYLVANIA ELECTRIC PRODUCTS NC. 1740 Broadway, New York 19, N.Y. ICompany In Canada: Sylvania Electric (Canada) Ltd. University Tower Building, Montreal Address LIGHTING RADIO ELECTRONICS TELEVISION ATOMIC ENERGY

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry cord on last page. 119 www.americanradiohistory.com Electronic Reliability HIGH GAIN INDUSTRIAL (Continued from page 118) creases with the operating time of the lamp; therefore, lamp life has a fairly well- defined distribution,24 and dependability can be increased POCKETSCOPE by regular replacement. By con- trast, vacuum tube failure (at least in receiving tubes) is still virtually unpredictable and not subject to improvement by preventive main - tenance.33, 38 (See Fig. 2.) Tube failure frequency is usually highest in new tubes ( "infant mortality "), whereas many 2.5 v. receiving tubes are still operating after 20 yrs. It is suspected that some incipi- ent tube failures are foreshadowed by decreasing transconductance27 MO/ (perhaps especially when tested at subnormal heater voltage), but the practical importance of this potential maintenance aid is not yet proverb To be certain of beneficial results, it appears necessary to use transconductance tube testers with reproducible indications, MODEL S -14 -A accurately and to keep a continuous record of Gm for each individual tube.' This history can be kept on a sticker ad- DC COUPLED hered to octal size tubes. This is 10 my /inch more difficult with miniature tubes, where the advisability of periodic Y CYCLE SWEEP checking is further doubtful because of the frequency of unde- tected failure by glass breakage during insertion into the socket.2 In general, tube life can be prolonged by operating well under the Size: 12" x 6" x 7 " manufacturer's maximum ratings 123/4 Pounds (voltage, current, dissipation, etc.). Cathode failure can be caused by gas released by overheating of al- ANOTHER EXAMPLE OF L,ate/zmaiz PIONEERING ... r most any part of the tube. But in The HIGH GAIN POCKETSCOPE, model S -14 -A, is an outstanding some circuits, notably broad -band achievement in the field of oscilloscopes. The high vertical and horizontal amplifiers, the sacrifice of transcon- sensitivities of 10 and 15 millivolts rms /inch respectively; frequency re- ductance at reduced current cannot sponses within -2 db from DC to 200 KC; non -frequency discriminating be tolerated. attenuators and gain controls; plus individual calibration voltages are but a few of the heretofore unobtainable characteristics of DC coupled oscil- Operation of ordinary tubes for loscopes. The sweep is operated in either a repetitive or trigger mode over a long periods of time with zero cath- range from 0.5 cycles to beyond 50 KC with synchronization polarity ode current can produce cathode optional. All this and portability too! The incredibly small size and light "sleeping sickness," an interface weight of the S -14 -A now permits "on- the -spot" use of the oscilloscope in all industrial, medical, and electronic fields. Its rugged construction assures formation in the oxide coating, "laboratory performance" regardless of environment. causing reduced transconductance and /or a video peaking effect with a time- constant of a usec or so. This WATERMAN PRODUCTS CO., INC. effect can probably be reduced by PHILADELPHIA 25, PA. operation at lower heater voltage, WATERMAN PRODUCTS INCLUDE CABLE ADDRESS: POKETSCOPE where the peak current requirement permits.92 Tube manufactur- S -4 -C SAR PULSESCOPE7 ers have learned how to avoid in- S -5 -A LAB PULSESCOPE terface formation in "premium" S -6 -A BROADBAND PULSESCOPE tubes, and we can hope that this 1 S -11 -A INDUSTRIAL POCKETSCOPE® will eventually be S -12 -B JANized RAKSCOPE® new knowledge S -14 -A HIGH GAIN POCKETSCOPE applied to all tube types. S -14 -B WIDE BAND POCKETSCOPE A third major cause of cathode S -15 -A TWIN TUBE POCKETSCOPE failure is due to excessive cathode RAYONIC® Cathode Ray Tubes current° It is believed that the oxide and Other Associated Equipment coating is simply overheated by the WATERMAN PRODUCTS space current passing through it

120 For product information, use inquiry cord on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1935 www.americanradiohistory.com PRESTO PROUDLY' PRESE1

TH iroffefire T- 18 a triumph of new design... the world's finest hi -fi turntable for professional and home use

Topping the achievement reached by all previous PRESTO turn- in turntable design. The famous flick shift that selects 3 speeds tables is the new PIROUETTE T -18. This magnificent mechanism with a simple sideway motion of the single control lever. The is streamlined to the nth degree... inside and out. Its beauty single movable plate on which the 3 idlers are mounted is the and balance of design ...its brilliant performance ...has in- heart of the mechanism! Elimination of trouble- making arms spired the name PIROUETTE...winning entry in a nationwide and shift cams. All in a heavy weight turntable that looks unbe- PRESTO contest run for hi -fi fans and experts. There is no finer lievably light and graceful ...in sleek telephone black and choice than PIROUETTE T -18 for rugged professional use or brushed chrome finish. Mounting requires simple rectangular home enjoyment. cut -out. PIROUETTE has all the revolutionary PRESTO developments Price: $53.50; with hysteresis motor $108. See PRESTO's PIROUETTE T -18 at the Wescon Show Booth 1627 August 24,25,26

PRESTO RECORDING CORPORATION, High Fidelity Sales Div. TT PARAMUS, NEW JERSEY Please send me illustrative data and specification: RECORDING CORPORATION new PRESTO PIROUETTE T-18 turntable. Name PARAMUS, NEW JERSEY Address

Export Division: 25 Warren Street, New York 7, N. Y. City Canadian Division: Instantaneous Recording Service, 42 Lombard Street, Toronto Zone State LARGEST OF WORLD'S MANUFACTURER www.americanradiohistory.comPRECISION RECGRDIN(; FnuIPMENT Aun nicrc "Reps" & Distributors Serving the

REPRESENTATIVES DISTRIBUTORS are the names and addresses of organi- This section lists those representatives on the These zations handling the distribution of radio -TV- West Coast operating as independent "reps" and on the West who handle two or more lines. They do not electronic parts equipment under states include factory staff salesmen. "Reps" are Coast. Listings are alphabetical

1 indicates membership listed alphabetically under states and cities. and cities. Asterisk *1 in National Electronic Distributors Association Asterisks ( *) indicate membership in "The numbers are given to Representatives" of Electronic Product Manu- (NEDA). Telephone contacts. facturers, Inc. Telephone numbers are given speed to speed contacts.

CALIFORNIA Vermilye Co Charles 3440 Wilshire Blvd DU 2-5695 CALIFORNIA Wallace & Wallace 1206 Maple All RI 7.0401 ALHAMBRA LOS ANGELES AREA *Weber Co Wedge 1217 Venice Bird DU 7-2111 Coast Electronic Supply 527 W Alain AT 9 -4361 Appleton Co Harry 136 San Fernando CA 1.2171 Western Electronic Enterprises Compton Blvd 3348 W BAKERSFIELD Barron -Jerre 817 S Honer St DU 3-5248 (Gardena) OR 8 -4817 Arbuckle 1 C 500 E 19 St 5 -5816 Hdqrs Fresno Bantou & Donn 1406 S Grand Ave RI 6191 Wiley Pan! F 1632 Sllverlake Blvd NO 3 -8028 Gough Industries 3125 Jewett St Baughman Co E 1 1914 N Cogswell (El Monte) 'Wood Co A M Box 150 (Elmonte) CU 3-1201 Valley Radio Sapply 716 Baker St FA 7 -8831 FO 0 -7586 Wright Eng'g 180 E Calif St (Pasadena) BY 1 -8488 Becter Ce Herb 1140 Crenshaw Blvd WE 1 -1257 BERKELEY SACRAMENTO Pacifie Radio 1940 Ashby Ave TH 3 -8900 Berman Co 1 1141 LaClenega St BR 2 -9138 Supply Neely Enterprises 309 Osehner Blvd GI 3-7461 Buchman Co W B 923 E 3 St MA 6 -2325 BURBANK Electronics 1500 W Burbank Ch VI 9-2277 Coh S X 1769 S Holt Ave TE 0.4398 SAN FRANCISCO AREA Dean's Exch W Burbank Hdqrs Holly- Cochrane Ca Iry M 408 S Alvarado DU 5 -1713 Ault C E 625 Laurel Ave (Menlo Park) DA 5-4983 Pacific Radio 4101 wood Craig Ralph P 715 N Harper Are WE 0468 Barstow .L Doran 248 9 St UN 3 -2079 N Magnolia Blvd Davidson & Assoc Joe PO Box 108 (Sostb Gate) NE Belchamber P A 1401 Middle Harbor Rd (Oakland) Valley Electronic Supply 1302 6 -2245 GL 1-4460 CATHEDRAL CITY Wholesale Electronic Specialists 573 Broadway PA Darts Sales Co George 5259 E Beverly Blvd UN 3.3394 *Berman ue E L 780 Natoma St UN 3-0317 ()untie B 3257 W 6 St Brainard W V 721 Clementine St UN 1 -2569 8 -3302 CHICO Ealy Co M D 633 S La Brea WE 5.0771 Buchman Co W B 444 Brannan St YU 2-4312 Kemp Co E M Main St FI 2 -8703 Eastman Pacific Co 2320 E 8 St TR 6317 Detseh & Co 341 10 St MA 1-2788 851 FI 2 -8140 *Edwards & Co Jackson 6047 Hollywood Blvd Eichorn & Melchior 500 Minn. St UN 1-8309 Radio Television Products 738 Cherry 710 5 -1141 Frazar & Hansen Ltd 301 Clay St EX 2 -5112 COMPTON 1508 E Compton Blvd Electronics Unlimited 4934 Venice Blvd Los Angeles 19 French H P 721 Garland Or (Palo Alto) DA 3 -0397 Electronic Parts Distil Calif WY 3828 Harries Sales Co L H 383 Brannan St YU 6 -1084 NE 1-7227 Emmet F A 2837 W Pico Blvd RE 1-8211 Held Herman E 147 10 St UN 3-4250 CULVER CITY Feldman Co Henry 1244 S Grand PR 8803 Herman Co James P 1234 Folsom St MA 1.4166 Stewart & Stevens 8525 Steller Dr TE 0-6511 Fox Associates 5401 Santa Monica Bird HO 3 -7194 Hitt Co W C 1355 Market St KL 2 -2311 EL CENTRO Hardie Co R M 901 S Manhattan Pi RE 4-2752 Hodges Elmer C 1264 Folsom St UN 1 -2367 Ainza- Hoffman Dietrs 1125 W Main 2307 Harmon Co W S 121 N Robertson Blvd (Beverly Howard 0 M 782 Bryant DO 2-6320 EL MONTE Hllis) BR 2 -3321 Jewett Samuel 0 13537 Addison St (Sherman Oaks) Kimball -Stark 713 S Tyler FO 0-2594 Hast Nate 301 S Reeves Dr (Beverly Hills) CR 5-2652 ST 9 -6027 EUREKA Hastings Sales Co 4942 Vineland Ave (N Holly- alttleson Ca 2166 Market St HE 1.5304 Commercial Radio & Elec 317 W 7 St HI 2 -4179 wood) Lewis Assoc Dean 219 9 St UN 3 -1414 Redwood Electronics 313 W 7 St HI 2-1301 HIli Sales Ce 1 T 800 W 11 St RI 7-3384 Logan Assoc 725 Greenwich GA 1-0076 FRESNO Hitt Co W C 1169 S Broadway PR 2105 Logan Sales Ce 530 Gough St HE 1-5127 Arbuckle 1 C 2349 Kern 4-6555 King Co W C 1355 Westwood Bird GR 8 -8679 Marshall Barry E 104 Olive St OR 3 -2173 Billings Wholesale Radio 260 Fulton St Kittleson Co 416 N LaBrea WE 8 -2455 Meyer & Ross 113 10 St HE 1-0480 DeJarnatt Whsle B J 223 Felton 2.2153 ',Knight Co W Bert 10373 W Piso Blvd BR 2.5647 Moolthrop & Hunter 165 11 St HE 1 -2624 Dooley Harry 725 L St 2-4108 Koessler Sales 6907 Melrose Ave YO 6271 Moxon Sales G E 422 Lalolia Ave (San Mateo) FI Fresno TV Supply 1449 Broadway 6-9666 Lacey Bob 436 S Beachwood Dr (Burbank) TH 8-9421 5-2866 General Elee Supply 1234 0 St 4 -4746 La More, G D 1325 San Julian RI 6378 Neely Enterprises 2830 Geary Blvd WA 1-2361 Graybar Electric 101 Van Ness Ave FR 2 -4175 Larshan Inc 1409 Wilshire Blvd (Santa Monica) TE Nlekerson & Rodet 381 Brannan St YU 2 -2982 Hoffman Sales 1740 Van Ness 6 -8321 0 -8489 Matt & Co L A 1061 Howard St HE 1 -4738 Kleruiff & Co 725 I. St Hdqrs Los Angeles Lasore Co Harry A 9041 W Pico Blvd BR 2 -7805 Purdy Co W 1 312 7 St UN 3-4321 Kinney & Faust 1740 Van Ness 6 -8321 Lookota Co Douglas 1052 W 6 St MA 6-4505 Ross Co David H 534 El Camino Real (San Carlos) Meyberg Co L 1 2930 Butler Hdqrs San Frnnclsca Lynch & Son C R 3307 Glendale Bird NO 3-8236 LY 3 -8224 Ports Mfg Co 3265 Belmont 3 -6728 Lynn & Brooks 3055 Wilshire Blvd DU 2-2255 Scales Co James M 1355 Market St KL 2 -2311 Schiefer Sound 2121 Blackstone 7-7234 Mann Assoc Martin 8346 Beverly Blvd WE 3-8528 Sinai Arnold A 65 9 St UN 1.6259 Westinghouse Eles 2608 Calif 4 -5091 Marsh Co 1 W 4216 W Jefferson RE 2 -0145 Tompkins & Co W W 941 Newell Rd (Palo Alto) FULLERTON Marshall Co G S 40 S Los Robles (Pasadena) DA 3-3270 United Radio & Electr 122 S Pamona St LA 5 -3424 SY 5 -2022 West Coact Electronics 1013 S Claremont (San GARDENA Marshank Sales 672 S Lafayette Pk DU 7.8235 Mateos DI 3-4700 Video Suppliers 14526 Crenshaw DA 9 -4053 Maynard Sales Co 6214 W Manchester OR 8.3150 GLENDALE Miller Co Gerald B 1550 N Highland (Hollywood) Hagerty Radio 6826 San Fernando Rd TH 8 -2453 HO 2 -1195 OREGON Weatherford Co R Y 6921 San Fernando RO 9-2281 Mitchell Co C H 256 S Lapeer Dr Beverly Hills BR HOLLYWOOD 2 -0183 PORTLAND Hollywood Radio 5606 Hollywood HO 4 -8321 Neely Enterprises 7422 Melrose Ave WE 3 -9201 *Birchen) Co Don H PO Box 4098 BR 3830 Pacific Radio Exch 1.107 Cahaenge NW 2-1393 Olander & Co Roland Beverly Blvd WY Eckersiey James W SW Hamilton St AT 0308 7225 0028 3150 Western States Elec 1509 N Western Ave HO 5-7185 Osborne R E 1044 S Park View DU 8-1039 Hawthorne Electronics SE Hawthorne Blvd Fl 9375 700 Yale Radio Eles 6616 Sonset Blvd GL 4169 Owens Co Lee H 2331 W Washington RE 0230 Co Richard 2118 SE Division St EM 8918 Legg HUNTINGTON Perimoth- Colman & Assoc 2419 S Grand Ave RI 7-4321 Miethorne Co L L 7521 NE Gllsan St KE 0010 Martin Dist Co 2475 E Florence Ave Power Ralph L 767 Castelar St MU 5277 *Weber Co Dale 234 Sherlock Bldg AT 5403 Reno Roy E 1406 S Grand Ave RI 7 -3893 INGLEWOOD Rios Ed 1250 Wilshire Blvd MA 6 -8912 Acorn Radio 599 La Brea OR 8 -5344 Cook Electronics 210 E Hardy St OR 8 -7644 Rissl Ai J 2724 S Peck Rd (Monrovia) DO 6.2135 WASHINGTON Inglewood Electronics 836 S LaBrea OR 4 -2366 Roberts & Assn E V 5068 W Washington SEATTLE WE 8 -2541 LONG BEACH Backer Co Jos J 2321 2 Ave MA 8811 *Rupp Co V T 2230 W 11 St DU 3-4197 Cal -Tenna Electronic 363 South St LB 20 -7954 Carlson Co Fred W 2307 5 Ave EL 6630 Saul & Assoc Howard M 5013 San Vincente Blvd. Dean Co F S 969 American 6-5281 WE 8 -3591 Haight Co Fred H 3212 Eastlake EA 1818 General Electric Supply 840 W 12 St 3 -5311 Seigel Co Sameei 1133 S LaCienega Blvd BR 2-4183 Howell Sales 1250 1 St S EL 4214 Gough Industries 838W12 Hdqrs Los Angeles Shephard Marty 7559 Melrose Ave WE B -2996 Jensen Co Verner 0 2616 2 Ave MU 2929 Graybar Electric 800 W 16 St LO 70 -2911 Kierou t Pacific Ave Sievers Edward S 1662 Hillhurst Ave NO 2 -1105 Lee Co Dave M 2517 2 Ave MA 5512 & Co 1760 6-8268 A Box -C ST Ley Co Elwyn W 5550 Dairy Ave 20 -5444 Smedley B 67 (Pasadena) 8-1174 Levinson Co Harry 1117 2 Ave MA 5317 Seltzer T Loals 5777 W Pico Blvd WE 1 -5566 Lynda Electronics 1526 E 4 St 7-4807 *Marsh Agencies 2601 I Ave MA 8761 Starr Edwin E 4101 Rhodes Ave (N Hollywood) Radio & TV Equip 2227 Patine Hdqrs Santa An ST 7 -5879 'Merritt Co Ron 120 W Thomas GA 6644 Scott Radio Supply 266 Alamitos 7 -8629 Stolaroff Co M A 466 W Slauson Ave AX 3 -6219 Meredith Co Ron 2410 Beacon Ave FR 8040 Waller Ioe H T 645 W 15 St 35-4844 *Stone Assoc Carl A 1102 S Western Are R 2-8103 Norris Co George D 3010 1 Ave EL 6662 Westinghouse Eles Supply 901 W 12 St *Stone Sales Co R L 9548 W Pico Bird BR 2 -4916 Northwestern Agencies 4130 1 Ave S EL 8882 LOS ANGELES Conrad R N Western Ave HO Allied Radio S Normandie Ave PL 2.3134 *Strainer Co 1865 1.7086 Panons & Ce C B 3028 1 Are MU 3933 Sepply 7319 h ey George S 1148 S Grand Are RI 7 -7553 American Electronic 567 S Fairfax Ave YO 5181 Porter Co Bort C 4310 Roosevelt Way ME 6828 Tebergen Assoc 2232 W 11 St DU 9 -3173 Basford Co H R 3320 Leonls Blvd LU 1-6258 *Strom Co S N 1612 Broadway FR 7515 Uccke E H 4938 Neola PI CL 7 -9611 Bell Radio Supply 1311 W Florence Ave PL 2-7191 Van Grass Co 14515 Dickens St (Sherman Oaks) Wedel Co Frank 3215 Western Ave GA 0222 Calif Electronic Supply 11801 W Plea Blvd St 7 -7882 Widdekind Co M K 216 1st Ave M EL 6981 BR 2 -2126

122 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com West Coast Electronic Industries

Ceazan J N Co 3535 S Broadway AD 1-9133 HIFI Supply .118 Baseline 2 -5581 MEDFORD Central Scientific Co 6446 Telegraph Rd RA 3 -6141 Inland Electronic Supply 843 Geffen Are 6.5571 General Electric Supply 121 W 4 St 3 -2423 Dunkle Radio Parts 2506 W 8 St KlerulR & Co 1123 W Base Line Hdqrs Lee Angeles United Radio Supply 301 S Front 3 -4003 Federated Purchasers 11275 W Olympia Blvd SAN DIEGO Walker Co V G 205 W Jackson 2 -4558 BR Westinghouse 2 -0831 Ceazan Co 1 N 1945 E Harbor Dr BE 9-1301 Elee Supply Co 1233 Court St Flgart's Radio 6320 Comm Sleet Dr YO 6218 Electric Similes Dist 435 2 Are PENDLETON General Elee Supply Turner St MA 5 700 -7141 Electronic Equip Dist 1228 2 Are BE 2 -3155 Harolds Radle Supply 320 SW Court Ave 1956 Gerstman Dist 414 S. Western DU 8 -2238 General Elee Sapply 450 2 Ave BE 9 -0271 PORTLAND C.L. Electronics 905 S Vermont DU 7 -5104 Gough Industries 3255 5 Are WO 0659 Appliance Whole 600 N W 14 AT 6584 Gough Industries S Mission Rd MA Grayhar Electric 720 State St BE 3-1361 560 6 -2474 Central Distrs 1131 NW Couch AT 0146 Mersin' & Co 2426 4th Ave Graybar Electric 210 Anderson AN 3 -7282 Connelly Co F B 905 NW 12th Are CA 1755 Radio Parts Co 2060 India BE 9 -9361 Henderson Co 628 N Alvarado DU 2.8301 Eoff Electric 509 NW 10 St CA 9411 Shanks & Wright 2045 Kettner BE 9-0176 Henry Radio Shop 11240 W Olympic Blvd GR 7 -6701 General Electric Supply 300 NW 14 Ave BR 0651 Sllrergate Radio Supply 2361 India FR 9 -6125 Hollywood Electrenie Melrose Ave WE Gilbert Bros 826 SW 2 Ave BR 5641 7460 3 -8208 Western Radio & TV 1413 India St BE 9-0361 Kerwin Co 11 1525 S Flower St PR 5323 Graybar Electric Park & Flanders BR 6641 SAN FRANCISCO KlerulR Electronics 820 W Olympie RI 7 -0271 Home Makers Supply 824 S W 18 St CA 9385 Assoc Radio Distr HE 1 K & L Radio Parts Co 1406 Venice Blvd RI 9-0553 1929 Market St -0212 H & R Radio Supply 5210 NE Sacramento TR 0057 Los Angeles Radio 10217 Venice TE 0 -5862 Bastard Co H R 235 15 St MA 1 -8545 instrument Lab 1728 SW Harbor Dr CA 6863 Brown Co C C St MA Martin Dist Co 2475 E Florence LO 5.7111 61 9 1-7000 Johnson Co Lou 1506 NW Irving Century Distr 1111 Front St YU 2-1480 Meyberg Co Leo 1 2027 S Figueroa St RI 7 -4451 Marshall Wells 1420 NW Lovejoy BR 6421 Eber Electronics 160 10 MA MInthorne Mask 2920 W Plco Blvd RE 4 -2177 St 1-4332 North Pacific Supply 2025 NW Overton AT -9576 Edwards Co Frank 382 6 St MA 1 -9700 National TV Supply 4032 S Figueroa AD 3 -8058 Northwest Radio Supply 110 SE 8 Are FI-9787 Ets -Hokin & Gales. Mission Olympic Eke 7636 Santa Monica Blvd HO 4 -9144 551 St EX 2 -0432 Pacifie Stationery 414 SW 2 CA 4221 General Electric Supply 1201 Bryant St UN Pacific Radio Each 1407 Caheenga Blvd HU 2-1393 3-4000 Portland Radio 1234 W Stark St AT 8647 Graybar Electric 1750 Alameda St MA 1-5131 Pacifie Television 4032 S Figueroa AD 3 -8058 Saelens Radio 1605 NW Everett AT 6395 Kaemper & Barrett 1850 Miss UN 3-3080 Pagel Bros 2605 E 4 St AN 2-5151 Stubbs Electric 33 NW Park Are BR 5404 Meyberg Co L 1 33 Gough St MA 1-3400 Beatify Dist 2545 S Yates Ave RA 3 -7121 Television & Radio 720 SE Alder EA 1104 Offenbach & Remus 1564 Market St XL 2.2100 Radio Doc 721 S Main St VA 3104 Tracey & Co NW 10 & Glisan Sts BE 6263 Pacifie Whioie 1850 Mission St UN 1 -4843 Radio Equip Dist 1340 S Olive St PR 9151 United Radio Supply 22 NW 9 Ave BE 6323 Radio Parts Sapply 281 9 St MA 1-0552 Radio Parts Sales 5220 S Vermont TW 9178 Westinghouse Elee 815 NW 12 Ave CA 9851 'San Francisco Radio 1284 Market UN 3-6000 Radio Prod Sales 1501 S Hill PR 7471 SALEM Smith & Crawford 789 Stevenson St UN 3-2045 Radio Spec 1956 S Figueroa PR 7271 Electric Tel -Radio Supply 408 Market EX 2.2898 Eot Ca 156 N Front St 3 -9251 Radio TV Sep 341 W 18 RI St 9131 Television Radio Supply 326 Market St EX 2 -2898 Gilbert Bros 355 N High St Hdqrs Portland Rarenscraft Co 2320 S Hill PR 1317 Johnson Tilton Industries 1850 Mission St UN 1-4843 Co Lou 1051 5 Commercial 3 -5955 Shelley Radio 2008 Westwood GR 7-6741 Westinghouse Eiee 201 Potrero UN 1.5051 United Radio & Elee 1924 S Grand RI 7-0441 Wholesale Radio 140 9 St HE 1-3680 Unir Radio Sup 1729 S Los Angeles PR 5241 Zack Radio S,pply 1424 Market MA 1-1424 Victor Dist, Co 2027 S Figueroa RI 7.4457 105E WASHINGTON Westinghouse Elee Sop 905 E 2 MA 9 -4161 SAN Wholesale Radio Peninsula TV & Radio 881 S 1 St CY 4-8781 & TV Sop 4305 S Figueroa St BELLINGHAM AD 3 -8171 Onement Inc Frank 161 W San Fernande St CY 4 -0464 Waitkus Supply 110 Grand Ave 274 MALIBU San lose TV Supply 986 The Alameda CY 4-7900 BREMERTON Telcoa 1 Azurelee Dr GL 6.2611 Schad Electronic Supply 256 W San Fernando Yale C & G Radio Supply 1301 Pacifie Ave 7 -5515 Radio Electric 6616 Sunset Blvd GL 4169 CY 7-5858 ELLENSBURG MARYSVILLE Westinghouse Electric 292 Stockton Ave CY 5-3707 Dunlap Radio Geiger Radio W A 1101 Columbia 2 -7701 Whsle 826 5 St Hirs Stockton SAN LEANDRO EVERETT MAYWOOD Millers Radio & TV Supply 1600 150 Are BR 6-3214 'Pringle Radio Whole 2514 Colby Ave KlerulR 6058 Walker Ave LO 5 -5461 Styles & Engieman 2255 Bancroft Ave LO 9-9433 MODESTO SAN MATEO KENNEWICK Wible Radio Supply Inc 13 S Dayton Ave Dunlap Whale Radio 1216 K St Hdqrs Stockton Associated Radio Distrlbders 1701 Gem St FI 5-3575 3591 Pacific Teietronie & Radio 417 Sop 7 St 3-7751 SAN RAFAEL SEATTLE Associated Industries 1752 Rainier MI 4400 MONTEREY Abbott Co E B 345 Frenetic° GL 3-1130 St Wholesale Electronics 229 Alvarado St 2 -7642 Central Electronic 2023 7th Ave SANTA ANA Coast Radio 110 University St MA 9133 NORTH HOLLYWOOD Graybar Electric 301 French St KI 3-8309 ilycor Sales Connelly Co F B 1015 Republican St SE 4155 11423 Vanowen St Harley Electronics 1434 S Maln KI 3 -9237 N Electronic Supply 5601 Calif Ave Hollywood Radio 4212 Lankershlm Blvd St 7 -3063 Radio & TV 207 Oak KI 2-6741 Fidelity Electric 960 Republican St SE 5100 OAKLAND SANTA BARBARA Garretson Radio Supply 2416 2 Ave MU 4380 Bastard Co H R 2101 Bush St GL 1.0314 Channel Radio Supply 523 Anacapa WO 2.3429 General Elect Supply 1212 1 Ave S SE 6400 8r111 Co W D 198 10 St TE 2-6100 Gough Industries 404 State St Hdqrs Los Angeles General Radio 100 Wall St Cass Altschul'''. Co 6038 Telegraph Ave uk 3-7557 Graybar Elec King & Occidental MU 0123 Electric Supply 140 11 SANTA CLARA St Instrument Lab 934 Elliott W AL 4940 Elmar Electronics Central Scientific Co 1040 Martin Ave AX 6 -6650 140 11 St HI 4-7011 Marshall -Wells 1258 1 SE 7447 General Electric SANTA MARIA Supply 5400 Hollis St OL 3-4433 Pacific Electronic Sales 1209 1st Ave MU 5877 Graybar Elec Dealers Wholesale Supply W Main WA 5 1911 Union St GL 1-5451 310 -7213 Radio Products Sales 1214 1st Ave MA 1035 Millers Radio & TV 336 E TW 8 St 3-3848 SANTA MONICA Radio TV & Appl 500 Westlake Ave N MA 0787 Rayerait Co 568 3 St TW 3 -9698 Santa Monica Radio 117 Santa Monica EX 3 -8231 Ratelco Inc 820 Minor N SE 7770 Wenger Co E C Harrison 1450 GL 1-1020 SANTA ROSA Seattle Radio Supply 2117 2 Ave SE 2345 Westinghouse Else 711 E TE 4 8 -9900 Santa Rosa Electro 1066 Santa Rosa Ave 7708 Stosser Electric 2246 1st Are S SE 5285 PALO ALTO SOUTH GATE Western Electronic 717 Dexter Are SE 3200 Associated Radio Distr 459 California Ave DA 3 -3173 Westinghouse Elee 1051 1 Are S EL 7001 Mac's Radio Sanely 8320 Long Beach . KI 4111 Zack Radio Supply 525 High St DA 5-5678 Westlake Electronic 511 Westlake N MA 6601 STOCKTON PASADENA Zerega Distr 515 Westlake N MU 2525 DeJarnatt Whsle B 1 515 N Hunter NW, Fresno Dow Zobrist Co H E 2121 Westlake MU 2121 Radio 1759 E Colorado SY 3-1196 Dunlap Whsle Radio 27 N Grant HO 6-7907 Electronic Supply 2615 E Foothill SY 5 -8902 General Electric Supply 24 N Aurora St NO 5-7231 SPOKANE Empire Electronic Di, 37 E Union St RY 1-7671 Kemp Co E M 50 N Wilson Way NO 3.5976 Columbia Electric S 123 Wall St RI 3131 POMONA Sacramento Elect Supply 710 E Main St HO 5 -2691 Connelly Co F B S 124 Wall St RI 6174 Anderson -Magus 1095 E Third LY 9-9669 Stockton Electronics 710 E Main St HO 5-2691 Frank's Radio Supply 161 S Adams St MA 8108 REDWOOD CITY VALLEJO General Electric Supply E 1805 Trent Ave KE 0431 Graybar Electric 1033 W Gardner Ave EM Electronic Supply 1740 Broadway EM 8-4093 Associated Radio Distr 1927 Solano Ave VA 3-4531 6611 Johnson Co E M W 615 1 Ave RI 5432 Television -Radio Supply 415 Lathrop St NW' Walker Co R Lyman 1401 Hiway 40 VA 3 -5675 Northwest Elettr N 102 Monroe MA 9289 San Francisco VAN NUYS Prudential Distr 318 W Trent Are MA 6002 RICHMOND Tags Radio & TV Supply 14530 Calvert St ST 5-3123 Spokane Radio Supply 301 W 2 Ave RI 8441 Millers Radio & TV Supply 319 37 St BE 5 -4424 VENTURA Standard Sales 1219 W 1 Ave RI RIVERSIDE 7196 Dealer's Whole 265 S Laurel MI 3 -6147 Taylor Distributing E 206 Augusta EM 3301 Electronic Supply 2486 3 St OV 3 -8110 Westinghouse Elee N 1023 Monroe EM 3371 Massey's Radio Supply 2992 8 St VERNON SACRAMENTO Westinghouse Elee Supply 4601 S Boy L St KI 0141 TACOMA Broils -Parks 2225 19 St GI 2 -2983 WALNUT CREEK C & G Radio Supply 2502 Jefferson Ave BR 3181 Dunlap Whsle 1628 "S" St GI 2 -1031 Ndgn Millers Radio 2497 Mt Diable Blvd YE 4 -8404 General Electric Supply 2316 A St BR 8454 Graybar Electric 2112 A St Ma 0164 Stockton WEST LOS ANGELES General Elee Supply 1131 St Stewart Co A T 711 Broadway BR 3174 "S" Cl 3 -9001 California Electronics 11801 W Pico BR 2 -2126 Graybar Electric 1900 14 St GI 2-8976 Westinghouse Elec 1930 Pacific BR 8417 Radio Kemp Co E M 1115 R St GI 3 -4668 Wible Supply 2360 S Fawcett St BR 8395 Meyberg Co Leo 1 1730 8 St GI 2-5837 VANCOUVER Radio Television Prod 2012 19 St GI 2 -7691 OREGON Saelens Radio 310 W 8 St 4 -2671 Sacramento Electronics 1219 "S" St HU 1-4821 WALLA WALLA Westinghouse Elee 1730 14 St GI 3-6525 Kar Radio & Electric 12 & Pine 4572 SALINAS EUGENE Sts Peninsula TV & Radio 42 W GabIlan 2-6503 Carlson Hatton & Hay 96 E 10 WENATCHEE SAN BERNARDINO Eo8 Electric 556 N Charnelton St 5 -4349 Mid -State Radio 6111/4 N Wenatchee Ave 510 Arrowhead Radio & Television 418 Base Line 2 -5181 Gilbert Bros 424 Charnelton St hdqrs Portland Pringle Radio 417 King St Graybar Electric 2180 6 Ave W EU 4 -2224 Featherstone Radio & TV 1010 E St 81 -1306 YAKIMA United Radio Supply 712 W 6 Ave 5-8547 General Elec Supply 485 S "I" St 5135 Lay & Nard 112 S 2 St 3 -5591 Gocah Industrie, PO Boa 222 Hdqrs Los Angeles KLAMATH FALLS Westinghouse Elee 210 W B YA 3 -4701 Graybar Electric 655 S "H" St SA 9 -1051 R F Supply 2367 S 6 St 6572 Yakima Wholesale Radio 506 5 1st 4670

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 123 www.americanradiohistory.com HIGH POWER FERRITE Aircraft Electronic Equipment CIRCULATOR COMMUNICATION

NAVIGATION

FLIGHT PLANNING

fuel gou,

GUN NNE CONTROL

Radar fire con1801.1,4r iurre

The above illustration was originally eralized airplane. Component require- shown on page 3 of the June 1955 ments vary with the class of aircraft. issue of Tele -Tech. Accompanying data For example 600 tubes and 9000 capaci- should have mentioned the fact that tors and resistors for a fighter become this material was originally compiled 5000 tubes and 115,000 capacitors and by staff members of the Sprague Elec- resistors for a heavy bomber. Inter- tric Co., North Adams, Mass. Eight ference suppression filters range from categories of electronic equipment are 250 to 500 shown against the outline of a gen- The Canoga ferrite Circulator is a four port non -reciprocal hybrid junction. It is Communication in TV the cameraman's voice if necessary. used for stabilizing the operation of high Our PL amplifiers have been in power magnetrons. The simplified single (Continued from page 116) use in the field for two years without termination isolator is lighter and more "stage," then, through "multi- boxes," a single failure or tube replacement, compact. and their use is gradually being The Circulator may also be used as a com- from that distribute the circuits adopted by the bination isolator -duplexer. In this appli- point. studio. cation it replaces the dual T -R duplexer The adaptor (Fig. 3) shows the assembly commonly used in broadband Cannon plug which plugs into the systems. amplifier, the TRS plug which plugs

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25 23 =MII®E.MEINIiIS. invites you to 15 OBERIM tau LROIR1n R L010 nOUTOR MO TRS JACK ANO ISOLn01WW1 i CANNON PAN PLUG sül visit its to INF 0.5 _i1111lI1iiiiiill TRS PLUG 200 VOLT operating products 1 PAPER 11 12 6 100 FREOLONCT ROC display at LOAD ISOLATOR SPECIFICATIONS Frequency 8300 -9800 me WESCON Isolation 30 db min. Insertion Loss Less than 0.6 db Input' VSWR, with 2:1 load VSWR into the switcher jack normally used electronics show Less thon 1.25:1 over the band technical headset Power Handling Ability: for the director's and convention Average Power 300 watts and the TRS jack into which his Peak Power 250 KW headset is plugged for reinforcing August 24 -25 -26 Cooling None required his voice on the camera PL circuits. Length of Unit 8 5 inches Used in this position, his voice is Weight 2 pounds Magnetic Field Supply ..Permanent magnet also boosted on the engineering PL BOOTH 121 Input & Output line to master control. In using the Flanges UG -51 /U, UG -52A /U or amplifier and adaptor to adapt it to UG -39/U, UG -40A /U the two -wire circuits, the voice on Civic Auditorium Write For Complete Details and Applications the microphone of the headset plugged into the adaptor is the only San Francisco voice reinforced. The regular dc CANOGA CORPORATION communications power remains on to furnish battery to all other headsets Radar Systems, Receivers, Test Equipment Antennas, Waveguide Components in the circuit. The amplifier- adaptor 5955 SEPULVEDA BLVD. combination may also be used at any of the camera to amplify y VAN NUYS, CALIFORNIA positions

124 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com BE SURE OF

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TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 125 www.americanradiohistory.com News of MANUFACTURERS' 4 . REPS

REPS WANTED Fairchild Recording Co., Whitestone, N.Y. announced following new Industrial and jobber sales on both the representatives: William Engelbretson Co. film and composition resistors to cover of St. Paul, Minn., covering Minnesota, southeast territory for midwestern man-. North Dakota, ufacturer. Includes Georgia, Alabama, and South Nebraska, North Iowa and part of Wisconsin. Ray John- and South Carolina and Termes- of see. (R -1) ston Seattle, Wash. covering the -8 Northwestern States, British Columbia National Sales organization seeking and Alaska. Loren F. Green & Associ- representation in Minnesota, North Da- ates of Chicago, fi. covering Illinois and kota, South Dakota and Western Wis- part of Wisconsin and Indiana. H. Roy consin for line of crystal high fidelity Gray Ltd. of Toronto, Canada covering phonograph cartridges. (R -8 -2) all of Canada except British Columbia Reps wanted for precision line of elec- for Fairchild high fidelity items. tronic laboratory and television test iffilosai equipment. Territories: Upper New Joseph Murphy has been appointed THE ALL NEW York State; New England area; Chicago; manufacturers representative for the Western States not including California, Cambridge Thermionic Corp. line of "AURICON Oregon, Washington, Idaho and Mon- electronic components. He will represent tana. (R -8 -3) C.T.C. in Indiana and Kentucky. PRO -600" Electro- mechanical servo components for 16mm Optical Sound -On -Film line available for representation in The M. A. Stolaroff Co., 4622 West Canada, all of midwest including Cleve- Slauson Ave., Los Angeles 43, Calif., land, Detroit, Chicago, St. Louis, In- was recently appointed as sales repre- Self- blimped for completely quiet studio dianapolis, Dayton, all of Texas. (R -8 -4) sentative to handle the line of elec- operation. Your sound -recording microphone tronic components manufactured by never picks up "Pro -600" Camera noise! Representation for a line of precision the Birtcher Corp., of Los Angeles. Mr. uhf and microwave test equipment Stolaroff will cover Southern Calif., ir 600 ft. film Magazines, for 16 minutes of available in the Pittsburgh area as well Southern Nevada and Arizona. continuous "Talking- Picture" filming. as in the states of Washington and lc Synchronous Motor Drive for "Single-System" Oregon, also Canada. (Ask for R -8 -5) Joe Davidson and Associates, South or "Double- System" Recording. Ohio, Texas, Florida, New England, Gate, Calif., has been appointed as Washington and Canada are territories technical service representative for the $ $1,165.00 list...for "Auricon Pro -600" Model Norden -Ketay Corp., manufacturer of CM -75 "Double-System" professional picture - offered by manufacturers of precision test equipment. (Ask for R -8 -6) electronic and electromechanical com- camera with built -in features. Also available ponents and instruments. The Davidson at added cost is "Single- System" equipment organization will render sales, engineer- for Optical Sound -Track -On -Film, also ing and technical services for all prod- View- Finders, 3 -Lens Turret, Critical Neely Enterprises, electronic manu- ucts produced by the Precision Com- Ground -Glass Focusing, Tele- Finders, etc.... facturers' representatives, have an- ponents Division and sold in Calif., Ari- Sold with 30 day money -back guarantee, you nounced the appointment of General zona, Nevada and New Mexico. must be satisfied! Manager Robert L. Boniface to the office of Vice President. The announce- ElectroData Corp., digital computer ment was made by President Norman manufacturer of Pasadena, Calif. has B. Neely, coincident with the transfer named the Ottawa firm of Data Proc- of the company's Los Angeles offices essing Associates Ltd. as its sales and to the newly - constructed headquarters service representative in Canada. in North Hollywood, California. This building program was projected and I. R. Stern will handle the Masco completed under the supervision of Mr. line in Southern Calif., Arizona, and Boniface. part of Nevada. "Bob" Boniface is a well -known figure in the electronics industry. His Marshank Sales Co., celebrating their thorough knowledge of the electronic 35th year as sales representatives, an- industry has been gained through four- nounce their move to spacious new teen years of practical, first -hand ex- quarters at 7422 Melrose Ave., Los An- perience in sales and business admin- geles, Calif. Karl E Tidrow, formerly istration with Neely enterprises. Vice -Pres. of Dow Radio, Inc., in Pasa- dena has been added to their inside Leonard P. Blakely and Martin Silver industrial sales staff. Write for free illustrated announce the formation of a new sales "Auricon Pro -600" literature. and engineering organization known as James W. Eckersley, 3510 S.W. Hamil- L &M Associates, located at 253 Boule- ton St., Portland, Oregon has been ap- vard, Hasbrouck Heights, New Jersey. pointed sales representative in the The companies represented by the or- Northwest, covering Wash., Idaho and con ganization include Adler Communica- Oregon, for Alliance Mfg. Co., makers AuriA PRODUCT Of tions Laboratories, New Rochelle, N. Y.; of radio -controlled garage door opera- BERNDT -BACH, INC. McColpin- Christie Corp., Los Angeles, tors and the Alliance Tenna -Rotor. Calif.; New London Instrument Co., G. J. Rodgers of Rodgers Associates, 198 6926 Romaine Street, Hollywood 38, Calif. New London, Conn.; Radio Frequency Old Farm Rd., Springfield, Mass., has MANUFACTURERS OF SOUND -ON -FILM Laboratories, Inc., Boonton, N. J., and been appointed as their sales rep in the RECORDING EQUIPMENT SINCE 1931 Tel- Instrument Co., Carlstadt, N. J. New England area.

126 For product information, us inquiry cord on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com New! ONE Watt

Raytheon KTR -1000A TV Microwave Unfit A new addition to the proven KTR series

Uses stable, dependable one watt Klystron The ultimate in simplicity and port- Reliable, low cost, powerful operation ability. Only 4 com- Frequency range -6875 -7125 me pact units per system. For STL, Remote, Intercity, Network interconnection Monochrome or Compatible Color with Audio Channel Model KTR -1000E available soon for common carrier band. t In use by leading TV stations throughout the U.S.A.-names on request.

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For product information, use inquiry card on last page. 127 TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Delay Lines FOR INSURANCE" (Continued from page 80) TV "SIGNAL readily analyzed. Pulse delay may AND COLOR! be easily measured to within -!-5 %. MONOCHROME Depending on the quality and stability of the test equipment, this accuracy may be extended to ±2 %.

Sinusoidal Testing

Fig. 6 illustrates a sinusoidal -test setup. A calibrated signal -generator is fed through a matching network to the input of a properly terminated delay line. A lissajou pattern is used to compare the phase relation TARCSTABILIZING AMPLIFIER between the input and output. To compensate for phase shift in- Only 51/4" high, yet TARC has packed a SPECIFICATIONS troduced by the measuring oscillo- long list of functions into this Stabilizing Model SA 7410 graph, a phase -equalizing network Amp for both monochrome and color. Power: AC in 117 V at 65 watts; DC in 285 V 170 is normally required. This may be a Clamps NTSC color video removes at Ma ... Inputs: Negative signals and high delay line and may be adjusted to switching transients and power hum .. . imp. Comp. video .25 V to keeps sync and video outputs constant 1.5 V p.p. (15% sync min.); obtain zero- closure when the switch video V to V p.p.; . removes noise and overshoots . Or .2 1.5 is .. Sync 2 V to 4 V p.p. thrown to the input position. adjusts pix to sync ratio . . mixes sync Outputs: Line video or comp. When the switch is returned to the and non -composite video. Here is another video 1.5 V at 75 ohms imp. successful development out of TARC's Monitor video or comp. video output, the lissajou pattern will give depth of experience in the designing of 1.5 V term. in 75 ohms. Sync an indication of phase shift intro- multi- function video equipment. 4 V term. into 75 ohms. Clipping level: Adjustable from no duced by the delay line. A measure- clipping to clipping black Write for detciled spec sheet. video. ment of the lowest frequency which TRRC effects an identical closure of the

ELECTRONICS pattern yields the time delay for TARC ELECTRONICS INC. 44 URBAN AVE. WESTBURY, N. Y. 360° of phase shift. Effectively, time delay equals the period of this frequency. As frequency is increased, succes- sive identical closures will be obtained. The periods of these closure - frequencies will correspond to sub - multiples of time delay. Phase linearity can then be determined, but the number of points that can be taken is limited by delay line response and over -all time delay. Accuracy of phase -shift measurements is largely dependent upon the accuracy to which the frequency For applications where may be determined. Other factors environmental conditions re- also contribute to error; special pre- quire transformers of excep- cautions are required to insure: tional resistance to climatic conditions, put your problems 1. Freedom from coupling between up to Acme Electric engin- measured points. neers. Our facilities include 2. Freedom from harmonic distor- equipment for encapsulating tion. transformers in plastic resin 3. Adequate resolution of the lis- compounds. sajou- closure reading. We invite your inquiries. A similar test setup employs high - frequency voltmeters at input and output in place of the oscillograph. Bandwidth is obtained by plotting the ratio of output to input voltage ACME ELECTRIC CORPORATION as frequency is varied. 898 WATER ST. CUBA, N. Y. West Coast Engineering Laboratories: 1375 W. Jefferson Blvd., Los Angeles, California Presented at the 1955 I.R.E. National Con- In Canada: Acme Electric Corp. Ltd. vention. 50 Northline Road, Toronto, Ontario Refer 1. E. W. Kimbark, Electrical Transmission 01 ta.et,ric Power and Signals," Wiley, 1949. Aetna 2. M. B. Kline, "Techniques in Pulse Measure- TR A N S F On N E R S ments." The Oscillographes, Vol. 14, Nos. 2, 3.

128 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com 47) \ ® ®©©®®® ®© 8 99 OZ. cat, m DAYSTROM POTENTIOMETER o c ® o0moo d c ° ', If you are having trouble finding the right "pot," !/e/rO/v Bt/T RE449f45E,2 consider TINY TRIM Model 300 -00 (1T3 '16) THE J'/LL y AHJ'u/E,PJE WE GOT BEFORE WE p//T /N THOJ'E ° o or TINY TEN Model 341 -00 (T -101 '2). 4.f/LL/oh, 41,6-M/NiATI/RE DAy,PTRoti1 RVT?- ,, Tiny Trim, a precision -built, wire -wound / 4

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TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product Information, use Inquiry card on last page. 129 www.americanradiohistory.com MM I WEST COAST TRIAD NEWS BRIEFS designs and produces Special Allen B. Du Mont Labs., Inc. is construct- The Ramo- Wooldridge Corp. of Los An- ing a new West Coast electronics center in geles was recently involved m a $20,000,000 1 Los Angeles to handle the increased West financial arrangement with its electronics Coast activity of the company. The new and guided missile affiliate, Thompson Prod- REACTORS and building will be located at 11800 West ucts, Inc. This was made available to them Olympic Blvd., and will contain approxi- by Thompson Products to finance the con- mately 30,000 sq. feet of floor area. tinued rapid expansion of the firm, now TRANSFORMERS employing nearly 1000.

California State Polytechnic college's en- R-C Scientific Instrument Co., Inc., 307 gineering department reached a milestone Culver Blvd., Playa Del Rey, Calif. recently to your recently when Herbert L. Leach of South perfected a rapid, accurate, non -destructive Gate received the one thousandth engineer- method of testing evacuated or pressurized ing degree to be given out since 1941. sealed containers. specifications Dr. E. L. Michaels, supervisor of the Ad- Resdel Engineering Corp., Los Angeles, vance Development Group of the Packard - Calif., recently moved into new quarters Bell Co., said recently that the public can ten times its original plant capacity. Henry expect a color television set by this fall K. Abajian, president, announced that added that will be practical both as to cost and emphasis on the production division neces- quality. Dr. Michaels bases his statements sitated the move to a 21,000 sq. ft. brick on the advances which have been made in building at 330 S. Fair Oaks Ave., Pasadena, overcoming the technical problems which Calif. have stood in the way of color TV.

Servomechanisms, Inc. recently moved Dr. Lee A. DuBridge, president of the their executive offices. The Eastern division California Institute of Technology, Pasadena, is now located at Post and Stewart Avenues, Calif., announced recently the four winners Westbury, N. Y. and the Western division at of Howard Hughes Fellowships in Science 12500 Aviation Blvd., Hawthorne, Calif. and Engineering, established for the training of outstanding research engineers and physicists. The awards went to: Robert W. Stanford Research Institute has completed Hallwarth, 24; Arthur F. Messiter, Jr., 25; a preliminary design and cost study for a Richard I. Tanaka, 26, and Norman J. Za- highly versatile test nuclear reactor it busky, 26. hopes to establish in Calif. Construction and operation on an industry- cooperative basis is contemplated. Electronic Specialty Co. of Los Angeles, Calif. has established a new Miniature Com- ponents Division to design and manufacture Sylvania Electric Products, Inc. officials special capacitors and radio noise filters. stated recently that the nation's use of electricity will double in the next 10 years, much of it due to increased electric power demands in the West, and that the West Hoffman Electronics Corp.'s, 3761 S. Hill Coast would be in the forefront of atomic St., Los Angeles, Calif., 1955 catalog was energy as an electric power source. the only black and white winner in the fifth annual Lithographic Awards Competi- t'on in the catalog division. It placed third directly behind full -color catalogs on the The Gudeman Co. of Calif. has moved Chrysler Imperial and the '55 Chevrolet. their branch at 9200 Exposition Blvd., Los Angeles to new and larger quarters at 2661 S. Myrtle Ave., Monrovia, Calif., in line with the company's expansion program. The enlarged plant will be immediately International Resistance Co., Phila., Pa., of the has purchased EMEC, Inc. of Seattle, Wash., adjoining the Dilectron division manufacturers of magnetic clutches for company. electronic and electrical applications. The Kaynar Company, Kaylock Division, 820 E. 16th St., Los Angeles, Calif., is Lenkurt Electric Co., San Carlos, Calif., offering without charge to those who write has announced five new 24- channel fre- in for it, a new drafting template, covering The same brilliant design, quency allocations are now available in the full line of Kaylock miniature all metal Lenkurt 45BX channelizing equipment for self -locking nuts. expert workmanship and radio and microwave communications sys- extensive tems. The new allocations permit up to facilities that 120 voice and signaling channels to be trans- make TRIAD transformers mitted and received over a single wideband The Northern California Audio Shows, radio system. They are in the frequency Inc. is holding their 3rd annual High Fidel- the 'Symbol of Quality range from 12 to 528 kc. ity Audio Show at the Sheraton-Palace Hotel from Sept. 30 to Oct. 2. The exhibitors is available to develop will be custom high fidelity component special transformers, manufacturers, factory reps, hi -fl distribu- Newark Electric Co. of Chicago, Ill., has tors, hi -fl shops, and record manufacturers. reactors and wave filters purchased Acorn Radio and Electronics, The general public is invited. for your particular 4736 West Century Blvd., Inglewood. Calif. It will be operated as a wholly owned sub- requirements. sidiary under the name of Newark Electric Tomlinson I. Moseley, president of Dalmo of California. Victor Co., San Carlos, a wholly -owned Company subsidiary of Textron American, Inc., recently announced plans for a new $1,200,000 building to bring under one roof all of the electronic firm's present facilities. The Packard -Bell Co. has won the Research 180,000 sq. ft. plant will be constructed on Institute of America's Key Member Award 10 acres of company -owned land on Harbor for Merit for its work in the field of em- Belmont. ployee relations. Blvd. and Industrial Way, Zero Mfg. Co. of Burbank, Calif., manufacturers of deep drawn metal instrument Philco Corp's Government and Industrial cases, has ordered two new hydraulic Division has announced the removal of its presses, built to Zero's special design and 055 Redwood Ave., Ven West Coast and Pacific Northwest regional specifications, from Hydraulic Press and sales office to a new location at Suite 417, Engineering Co. of Los Angeles, to keep 1355 Market St., San Francisco, Calif. pace with their current orders.

130 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com `MUf3 WiJJH

LE RESISTORS Type UPM -45 For TV preset control applications. Control mounts IR PRINTED CIRCUITS directly on printed circuit panel with no shaft extension through panel. Recessed screwdriver slot in front of control and 3/8" knurled shaft extension out back of control for finger adjustment. Terminals extend perpendicularly 7/32" from control's mounting surface.

Type GC U45 Threaded bushing mounting. Terminal extend perpendicularly 7/32 " from control's mounting surface. Available with or without associated switches.

Type UIO (Miniaturized) Threaded bushing mounting. Terminals extend perpendicularly 5/32" from control's mounting surface.

Type YGC-B45 Self- supporting snap -in bracket mounted control. Shaft center spaced 29/32" above printed circuit panel. Terminals extend 1 -1/32" from control center.

Type XP-45 For TV preset control applications. Control mounts on chassis or supporting bracket by twisting two ears. Available in numerous shaft lengths and types.

Type XGC-45 For applications using a mounting chassis to support printed circuit panel. Threaded bushing mounting. ARIABLE RESISTORS

OR SOLDERLESS "WIRE - Type WGC-45 Designed for solderless wire -wrapped connections with the use of present wire- wrapping tools. (RAP" CONNECTIONS Available with or without switch and in single or dual construction.

The controls illustrated are typical constructions. gineer',. ',.:experi, vailable or needs. EAST COAST OFFICE SOUTHWESTERN U.S SOUTH AMER! Henry E. Sanders John A. Green Company Jose Luis Pontet I North Broadway 6815 Oriole Drive Buenos Aires. Argentina Camden) 2, New Jersey P.O. Box 7224 Montevideo, Uruguay Phone: Woodlawn 6 -1668 Dallas 9. Texas Rio de Janeiro, Brazil CHICAGO TELEPHONE SUPPLY TWX No. Camden NJ 380 Phone: Dixon 9918 Sao Paulo. Brazil Phila. Phone: Market 7 -3129 cedgio 2afian WEST COAST OFFICE CANADIAN DIVISION OTHER EXPORT Robert A. Stackhouse C. C. Meredith & Co., Ltd. Sylvan Ginsbury 928 S. Robertson Blvd., Streetsville, Ontario 8 West 40th Street ELKHART INDIANA Los Angeles 35, Calif. Phone: 310 New York 18, New York Moe: Crestview 4 -5931 Phone: Pennsylvania f0111101 1/1196 o. BEV 117666

9 A '"iPCUican '' add c`ítán a' ta e e+ e44944 www.americanradiohistory.com Transistor Amplifier (Continued from page 75) voltage gain. Strong shunting of the input by R., however, may cause the power gain to drop faster than the first power of the voltage gain. Nevertheless, the input resistance may be so much greater when RE is employed that many applications Now you can may become feasible that would not -vcrmxï.D almost any electronic assembly be practical with very low input impedances. Furthermore, the intro- duction of RE immediately banishes the problem of the input current being an exponential function of the input voltage. The input voltage is now applied across the series corn - bination of the emitter -base diode and RE rather than directly across the input diode, thus the degenerative and resistive effects of RE cause the transistor currents to be practically perfect linear functions of the input voltage. Were RE not employed, it would be necessary to drive the input with a current (high impedance source) for undistorted Ultra -fine whiskers in semi -conductor devices, signal transfer. While voltage feed- shunts and header pins in relays, slit and back has been used around several filament assemblies for isotron and mass . spectrometer guns, and electronic stages (operational amplifier style), sub -assemblies of wide variation are now for local, stage -by -stage degenera- reliably and precisely joined at greatly tion, current feedback (RE) has been increased production rates by the used exclusively. Voltage feedback WELDMATIC Model 1015 lowers the input impedance, and voltage feedback does not simplify the equations in a natural obvious manner as does current feedback.8 In order to compare, crudely, the predictability of the performance of different amplifiers, operating points, and transistor types, it might be of value to compare the added emitter resistance to the denominator of the voltage gain expression, Eq. 2, and The WELDMATrc Model 1015 is a bench -mounted precision resistance the external input shunt to the input welder, compactly self -contained. impedance of the transistor. Thus the Weldmatic's stored -energy principle following design factors are sug- permits welding of copper, silver, gested: high- carbon steel, tungsten, molybdenum, and other "difficult" RL materials. Weldmatic millisecond weld -time insures reliable welds without r.+rb(1-a) + (r.+rb) r. discoloration, excessive deformation, DG , (8) or metallurgical change. Dissimilar RE metals and parts of widely different thicknesses are joined with ease. R. R. (I - a) The Model 1015 performs D: _ -^_ (9) outstandingly in both laboratory R, RE and production line operation Where DG is defined as the voltage gain design factor and DZ is defined as the input impedance design fac- Write for Complete Technical Information tor. Obviously, from a predictability on Stored Energy Welding standpoint, the design factors should be made as small as is economical. The small - signal parameters in Eq. 8 and 9 are intended to be the nominal or average values for the par- U N I T E K C O R P O R A T I O N ticular transistor type employed at the anticipated normal operating 268 North Halstead Pasadena 8, California point and temperature.

Visit Booth 242 -243 at WESCON show, San Francisco (Continued on page 165)

132 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com For the first Time... High Frequency Circuits Can Be COMPLETELY TRANSISTORIZED

New small -size Philco SB Transistors are her- UP TO 10 TIMES BATTERY LIFE metically sealed and Transistor operates have universal appli- The Philco Surface Barrier cations for RF and efficiently with power consumption of less than Audio. one milliwatt ! This extremely low power drain results in up to ten times the battery life obtainable with junction transistors, vastly reducing operating costs. Hermetically sealed, the SB Transistor has greater inherent characteristics Today, Philco's new SB Transistor opens of stability, longer life and higher efficiency than any other type of transistor. up a completely new field of commercial, industrial and military applications for the HIGHEST UNIFORMITY YET ATTAINED electronics design engineer. With vastly Due to Philco's unique design and precision superior performance assured to 50mc and production methods, the SB Transistor reaches above, many basic circuits can now be a degree of uniformity and unvarying quality completely transistorized. Video bandpass never before achieved with transistors. This design engineers to amplifiers, wide band low -pass amplifiers, remarkable quality permits specify the Philco SB Transistor with full and high speed high frequency oscillators assurance of superior performance. switching are only a few of the innumer- Now being produced in quantity this new can able circuits which the design engineer Philco SB Transistor is available for your produce quickly, easily, efficiently with the current projects and immediate shipment revolutionary new SB Transistor. can be made to you.

For complete technical information on the PHILCO SB Transistor write Dept. TT

PHI LCO CORPORATION

O V E R N M E N T A N D PHILADELPHIA 44, ç N D U S T R I A L D I V I S I O N P E N N S Y L V A N I A www.americanradiohistory.com 111_._._.. Frequency Measuring (Continued from page 85) so that one of its harmonics is equal to the frequency being measured, KLEI the difference frequency will be zero. The frequency being measured will then be equal to the frequency of the transfer oscillator times the ua i pliers. number of the harmonic causing the 1)1;SIOi1,D beat. Since the approximate value of Sp1:CIAI,1,ir a frequency to be measured is usually known, the proper harmonic number will also usually be known. In any case the harmonic number can be found by a simple system FOR THE ELECTRONICS INDUSTRY described later. Now, Klein quality pliers are ready for work. All are hammer Typical Zero Beats in new available compact pat- forged from high -grade tool steel, When the transfer oscillator is terns for precision wiring and cut- individually fitted, tempered, being tuned for a zero beat with the ting in confined space. Note, too, adjusted and tested -made by frequency to be measured, the first the replaceable leaf spring that plier specialists with a reputa- presentation obtained on the oscillo- keeps the plier in open position, tion for quality "since 1857." scope will be similar to Fig. 3. If the signal is stable, it will be possible to reduce the difference frequency LONG NOSE PLIER OBLIQUE CUTTING to an actual zero beat as in Fig. 4. 307-5-1/2L-Extremely PLIER - 210 -51 - For It will be realized that typical high slim pattern ideal for cutting small wires or frequency signals generally have the really tight spots. trimming plastic. Entire sufficient instability Jaws are knurled that an ideal to in- length of cutting knives zero beat will not sure a positive grip. works flush against cut- be possible. In fing surface. 5 these cases a typical zero beat will or 6 -inch sizes. be like that in Fig. 5, depending on the amount of instability or incidental frequency modulation contained in the signal. These patterns CHAIN NOSE PLIER LIGHTWEIGHT are those of typical zero beats as 317 -5L -A full inch OBLIQUE CUTTING plotted by a 60 -cycle sweep on the smaller than standard PLIER 209 -5- Smaller oscilloscope. A 60 -cycle sweep is pattern. Has a very fine than 210-5L with an ex- useful for the internal oscilloscope, knurl that will not dam- tremely narrow head. because the instability and inciden- age soft wire. Also Entire length of cutting tal frequency modulation are often available with- knives works flush related to the 60 -cycle power line out knurl `Q{ against cutting surface. frequency. The limits of deviation of frequency modulation can also be measured by adjusting the zero beat TRANSVERSE END NEEDLE -NOSE to occur at the limits of the f -m CUTTING PLIER PLIER 203- 6- SPC -L- excursion. To make measurements 204 -6- Useful in pre- Specially designed to of the excursion, it is convenient if cision work where or- reach into confined the oscilloscope sweep can be phased spaces. Tip dinary oblique or end of nose only 1/16 in. with the excursion of the signal. cutters are too di- bulky. ameter. Nose of plier The transfer oscillator oscilloscope Gives a clean, flush cut. tempered to prevent is therefore provided with a phasing distortion. Leaf control as well as with a terminal spring keeps plier open, ready for use. for using an external sweep signal. Also available without spring. / Accuracy As mentioned earlier, the accuracy ThisKlein Pocket Tool of the system is comparable to the Guide gives full in/or. ASK YOUR SUPPLIER mation onall types and accuracy of other precision systems. sizes of Klein Pliers. Foreign Distributor: In analyzing the system error, it A copy will be sent International Standard will be found that this error can be without obligation. Electric Corp., divided into two parts. First is the New York error in ascertaining the frequency "Since 1857" of the harmonic causing the beat. The error in this frequency deter- L Mathias Soos mination will be the same, percen- ÉN Established 1857 KLEINChicago, tage -wise, as the error with which of 7200 McCORMICK ROAD CHICAGO 45, ILLINOIS the fundamental the transfer (Continued on page 136)

134 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com MICROWAVE s SIGNAL GENERATORS

JUST ONE POLARAD MICROWAVE SIGNAL GENERATOR CAN MAKE ALL

THESE MEASUREMENTS e Receiver sensitivity

Each Polarad Microwave Signal Generator (4 models cover 950 -11,500 mc) is equipped loise figure with the unusually simple UNI -DIAL control that tracks reflector voltages automatically while tuning continuously. Frequency, accurate to +1%, is read directly on the single fre- Signal to noise ratio quency dial. There are no mode charts, no slide rule interpolations necessary. But, most significant are the built-in features that enale use of these rugged instruments Image rejection for so many applications: internal modulation, pulse and FM; internal square wave modulation; synchronization outputs, delayed and undelayed; provision for multi -pulse modulation Beacon sensitivity input; provision for external modulation and synchronization; variable attenuator calibrated directly in - dbm; engineered ventilation to insure specification performance over long Bandwidth operating periods. Contact your local Polarad representative or write directly to the factory for the latest tanding wave ratio detailed specifications. Antenna gain and pattern SPECIFICATIONS (all models unless indicated) Conversion gain or loss Frequency Internal pulse modulation: External pulse modulation: Model Range Pulse width: 0.5 to 10 micro: Polarity: Positive or negative Rate: 40 to 4000 pin Attenuation MSG -1 950 - 2400 mc seconds Delay: 3 to 300 microseconds Pulse width: 0.5 to 2500 MSG -2 - 4600 mc 2150 Rate: 40 to 4000 pps microseconds MSG 3 4450 8000 mc Synchronization: internal or Pulse separation (for multi: Filter characteristics pulses): 1 to 2500 MSG 4 6950. 10,800 mc external, sine wave or pulse Dle microseconds MSG -4A 6950 - 11,500 mc Internal FM: Output synchronizing pulses: Multi- pulsed systems, such as Frequency accuracy: 1-1% Type: Linear sawtooth Polarity: Positive, delayed & Rate: 40 to 4000 CPS undelayed Power output: Synchronization: Internal or Rate: 40 to 4000 pps UME, Tacan, etc. wave Beacons, MSG- 182:1mw external,sine or pulse Voltage: Greater than 25 volts Frequency deviation: MSG -3, 4 & 4A: 0.2 mw Rise time: Less than 1 micro - 2.5 second Attenuator range: 120 db MSG -3, 4 & 4A, 6 mcs MOW Price: Attenuator Accuracy: ± 2 AVAILABLE ON EQUIPMENT LEASE PLAN db Internal square wave MSG -1, 2 $1,720.00 Output impedance: 50 ohms modulation: MSG -3, 4 $2,190.00 SERVICE AVAILABLE nominal 40 MSG4A $2,450.00 FIELD MAINTENANCE to 4000 pPs THROUGHOUT THE COUNTRY

Prices subject to change without notice.

ELECTRONICS CORPORATION 43 -20 34th STREET, LONG ISLAND CITY, N. Y.

REPRESENTATIVES: Albuquerque Atlanta Baltimore Bayonne Bridgeport Buffalo Chicago Dayton Fort Worth Los Angeles New York Newton Philadelphia San Francisco Syracuse Washington, D. C. Westbury Winston-Salem Canada, Arnprior, Toronto- Export: Rocke International Corporation

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry cord on last page. 135 www.americanradiohistory.com Frequency Measuring (Continued from page 134) Eimac High Vacuum oscillator is known. This error amounts to ±1 part in lOs using a Rectifiers suitable external standard or ±1 part in 106 using the internal standard. The second error is the error in A . A. s A. A. . .r. A. A. .. A. ,. . . . O . . . .. a . . comparing the transfer oscillator A . V V A A i.....a.eV V +.. . `. _ harmonic with the frequency being ...... _ measured. This error is more diffi- s...c, s+..s\. s L A.. \... .yr- cult to specify precisely but is in sss.ash.isa..a. the order of -±1 part in 107. It in- let sles s-s s s r..a.a..Ar... 1/Itrs,",+livh.s s s-srs<..+...8~.r... volves to some extent the skill of ++1.a. s a s . the operator in adjusting the trans- '--+ r~..,ti fer oscillator for a zero beat. It also ti iá:`04. *., involves the At. short -time stability of iii.s the transfer oscillator and, of course, the stability of the signal. Fig. 6 shows the distribution of the error of comparison made in a large number of measurements on a very stable signal by five operators. To obtain only the error of comparison, a setup was used such that this error was the only error in the system. Modulation One of the advantages of the system in high frequency use is that it does not require that the signal being measured be at all times above a certain minimum amplitude. Mo- mentary absence of the signal such as is obtained with 100% amplitude modulation or momentary excursion into the noise level does not prevent the measurement from being made. A case of 100% amplitude modula- HIGH CURRENT, HIGH VOLTAGE OPERATION tion which is of special interest at higher frequencies is the case of Eimac's complete line of eight high ages without generating radio fre- pulse modulation. When r -f pulses vacuum rectifiers cover a wide range quency transients and have no lower are being measured, the difference of average current, 15ma to 750ma limit to ambient operating tempera- frequency will be presented on the and peak inverse voltages from ture. Ruggedly constructed, Eimac oscilloscope for the duration of the pulse but will not be presented 25,000v to 75,000v. In power supply high vacuum rectifiers contain many units, voltage multipliers, during the off -time when there is pulse serv- of the famous Eimac transmitting no pulse. This situation makes it ice or special applications at high tube features such as an instant heat- more convenient to use an oscillo- frequencies, extreme ambient temper- ing thoriated tungsten filament, that scope with a linear rather than sine - atures and high inverse voltages, allows application of filament, plate wave sweep, since the scope can be Eimac high vacuum rectifiers are voltages simultaneously; an exclusive sync'd from the r -f pulse envelope. ideal. They give reliable performance radiation cooled pyrovac* plate; and When the carrier frequency of an at high frequencies and high volt- elimination of internal insulators. r -f pulse is mixed with a harmonic of the transfer oscillator, oscilloscope presentations similar to those in EIMAC HIGH VACUUM RECTIFIERS Fig. 7 will be obtained For additional PLATE FILAMENT when the information about Average Dissipa- Peak difference frequency is low. When Eimac high quality, Current tion Inverse TYPE MA Watts Voltage the difference frequency is reduced high vacuum rectifiers, Volts Amps to its contact 2-25A 50 15 25,000 6.3 3.0 lowest value, the scope traces our Technical 2-50A Services department. 75 30 30,000 5.0 4.0 within the pulse envelope will be 8020 100 60 40,000 5.0 6.5 2.1500 250 90 30,000 5.0 13.0 a family of curves all having the * An Eimac trade name. 250R 250 150 60,000 5.0 10.5 same shape as in Fig. 8. If the stabil- 253 350 100 15,000 5.0 10.0 ity of the signal permits, scope 2-240A 500 150 40,000 7.5 12.0 the 2.2000A 750 1200 75,000 10.0 25.0 traces at an actual zero beat with a rectangular pulse will be a family of straight lines which have no slope. In practice, however, signals of such EITEL-McCULLOUGH, INC. CALIFORNIA stability are not often encountered. The World's largest manufacturer of transmitting tubes. (Continued on page 138)

product 136 For information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com a guy named Og

Once your name was Og. You tired of shouldering mastodon steaks...of dragging your mate by her hair. You invented the wheel.

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Your name is legion. You created every linkage... every device. .. every system.

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Next week...next month...next year...some system will need a better, faster, more accurate or more economical means of recording...or indicating...or computing...or many models of HELIPOT* precision potentiometers are controlling a process. stocked for immediate shipment You'll want precision potentiometers. ...our engineers will gladly adapt standard HELIPOTS to your You'll discover that Helipot makes the most complete line... requirements... or build linear and non -linear versions... in the widest choice entirely new HELIPOTS for you. of sizes, mounting styles and resistances. You're an engineer. for information and specifications Your career is in the making. ...write for data file .501 Helipot would like to hear from you.

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Helipot Corporation/ South Pasadena, California Engineering representatives in principal cities a of BECKMAN INSTRUMENTS, INC. 1 HCiNIN 390 *REG. U.G. CAT. OFF. division

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use Inquiry card on last page. 137 www.americanradiohistory.com Frequency Measuring NEW SENSITIVE, (Continued from page 136) In fact, it is rather typical that some frequency shift or incidental f -m of WIDE the signal source will occur during RANGE DC-VTVM the pulse. This will be indicated by Measures a waviness in the lines that comprise 25 uV to 1 000,000,000 uV the family of curves. Such waviness can be used to obtain a qualitative indication of the amount of f -m occurring during the pulse. Sawtooth Presentation While it is entirely practical to measure the frequency of pulsed carriers in the manner just described, there is a modification of the method that has been found to make the measurement faster with rectangular pulses. This modification consists merely of differentiating the difference frequency signal. Such differentiation will cause the pulse envelope viewed on the oscilloscope to appear as in Fig. 9. When the transfer oscillator has been adjusted for the lowest obtainable beat frequency and when the shortest time constant suitable for the pulse width has been selected, the pulse envelope will fully converge at the end of the pulse as shown in Fig. 10. The optimum time constant for differentiation thus becomes equal to about one -fourth the pulse width. To facilitate differentiation, the lower cutoff frequency of the video amplifier in the transfer oscillator c..taAC`._ °C" has been made adjustable over a .__Vz> C wide range by a control brought out to the front panel. The accuracy with which a pulsed r -f frequency Conn, scrrcraec' can be measured using either the rectangular or saw - tooth presentation is in the order of one one -hundredth of a cycle per Type MV - 27 C pulse width. For example, the carrier frequency of a 2 µsec pulse can be measured to an accuracy of ap- IT FILLS A where higher proximately 5 xc. For a carrier fre- NEED quency of 5,000 Mc this would and accuracy amount to an error of only 1 ppm. sensitivity greater are re- Pulse width affects the accuracy of measurement for the reason that it quired and justify its slightly higher cost. affects the length of time that a sample of the difference frequency MV -27C ( NEW) MV -WC ( STANDARD ) can be observed.

RANGE: 0 - 250 uV to 0 - 1 kV RANGE: 0 - 1 m V to 0- 1 kV Extracting Information ACCURACY: 2 % full scale ACCURACY: 3 % full scale When making frequency meas- PRICE: $320.00 f.o.b.Schenectady PRICE: $295.00 f.o.b.Schenectady urements, it often becomes desirable to have available the short- and long -time information contained in Time Progresse s S a D o W e the signal being measured. It may, for example, be valuable to record the slow drift occurring in the sig- MILLIVAC INSTRUMENT CORPORATION nal. It may be even more valuable to extract the incidental frequency P.O. BOX 997, SCHENECTADY, NEW YORK modulation from the signal. (Continued on. page 140)

138 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com One of a series on what makes one magnetic recording tape better than another

50% Extra Playing Time Extra Strength Mylar` Base

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REEVES SOUNDCRAFT CORPORATION PO FAST 51 e ST N T 2? N , Lubricated Both Sides... YET COSTS NO MORE RYTHING!

PLUS 50 Magnetic Re- in all of its varied subtleties. And Soundcraft Plus 50 adds cording Tape- newest in the Plus 50's uniform output, this special bonus: Its "Mylar famous Soundcraft line - inherently low signal -to -noise base assures virtually a lifetime brings you a combination of ratio, its 50% extra playing of smooth, trouble -free service superior qualities that no other time, added strength and flexi- at no more cost per foot than tape possesses. Qualities that bility ... its dimensional stabil- other quality tapes. Like all let you capture and hear the ity in any climate. These are Soundcraft products, Plus 50 true sense of violin strings, all the special qualities that make is engineered and made by the brilliance of brass, the col- it the choice of professionals tape recording specialists. Get or of wood winds ... that faith- and amateurs, alike, wherever some Soundcraft Plus 50 Tape fully record the human voice tape perfection is required. at your dealer's today. FOR EVERY SOUND REASON

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use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, 139 www.americanradiohistory.com Frequency Measuring is the pioneer he leader (Continued from page 138) Since both of these types of information are translated to the dif- WAVEFORM ference frequency produced in the transfer oscillator, they become available at carrier frequencies ANALYSIS which are convenient to deal with. By suitably offsetting the transfer oscillator frequency, a difference frequency in the range from a few 1 cps to cycles to a few kilocycles is obtained which can be applied to a wide range frequency -to- current discriminator. The output of this cps discriminator can then be passed to a 2000 d -c recorder for permanent record with the NEW purposes. PANORAMIC

SUB -SONIC ANALYZER

Fig. 11: Pattern when measuring wavemeter tuning. Transfer ou. birdie Is at bottom of notch

Short -time information can be recovered by much the same arrangement. In this case a discriminator giving an output voltage proportional to instantaneous frequency must be used. Such discriminators are commercially available and, featuring when used in this arrangement, will recover the short -time instability and frequency modulation originally FACTS: The model LF -1 Panoramic Sub -sonic cps Analyzer is designed specifically for applica- introduced into the signal. By tions demanding exceptionally high resolution analyzing the recovered information resolution of waveform components between 1 and 2,000 with an audio - frequency harmonic cps. The LF -1 operates as an adjunct to the wave analyzer, the relative magni- Panoramic Sonic Analyzer, widely acccepted tudes of the various modulation SUMMARY SPECIFICATIONS: Model LP -1 which provides detailed magnified views of spectrum segments either 100, 500 components can be compared. Such Overall Frequency Range: 1 cps -2000 cps cps. or 1500 cps wide anywhere between 20 an arrangement has been used to and 20 kc. A calibrated center frequency con- Voltage Range: 10 my 100 v for full analyze the modulation introduced to trol permits selection of the mid -frequency of scale linear deflection. the expanded portion to be examined. into a portable high -frequency Voltage Scale: Linear or two decade log. The Panoramic Sub -sonic Analyzer, Model transmitter when subjected to Recorder Paper Speed: 4" /min and LF -1 features spectral displays which are either mechanical vibration. 16" /min selectable. 1/10 or 1 /100 of the presentation width of WRITE TODAY the LP -1, that is 10 cps, 50 cps and 150 cps Other Applications for Complete Specifications. or 1 cps, 5 cps and 15 cps. Scan intervals of 15 seconds or 60 seconds are selectable. Spec- A precision frequency -measuring tral distributions are permanently recorded on system having the wide range and paper. simplicity of the frequency counter - APPLICATIONS: Vibration analysis of transfer oscillator system finds many large structures or of devices in which members uses in addition to straightforward rotate at approximately the same or multiples measurements of frequency. of the same speed. Noise analysis. Medi- By cal studies. Servo analysis. Geophysical using the system to monitor a stable, PANORAMIC investigations. tunable signal source, for example, RADIO PRODUCTS, INC. 14 South Second Ave., Mount Vernon, N.Y. the source becomes a generator of MOunt Vernon 4 -3970 very accurately known frequencies. Made by the makers of Panadaptor, Panalyzor, Pano- is _.rc Sonic Analyzer and Panoramic Ultrasonic Analyzer The system further valuable in measuring the frequency character - SEE US AT WESCON BOOTH 1414 (Continued on page 142)

product 140 For information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com H UGHES

SILICON JUNCTION D IODES

Dimensions are maximum for standard Hughes Silicon Junction Diodes.

0.265" MAX.

1 1/4" (APPROX.) (1 INCH MINIMUM)

FEATU RES -High temperature operation ... extremely high back resistance ... very sharp back voltage breakdown ... one - piece, fusion -sealed glass body ... axial leads for easy mounting High ... subminiature size . .. exceptionally stable characteristics. Temperature Operation* TESTED -All Hughes Silicon Junction Diodes are subjected to rigorous testing procedures. Specific electrical characteristics are measured and, in addition, each diode is temperature -cycled twice in a moisture -saturated atmosphere. When specified, spe- Extremely High cial tests are also performed. Back Resistance CONSTRUCTION - Hughes Silicon Junction Diodes are packaged in the famous fusion -sealed glass body, developed at Hughes. This construction is impervious to moisture penetration- ensures electrical and mechanical stability, and freedom Exceptionally Stable from contamination. When high temperatures or high back resistance require- Characteristics ments call for silicon, be sure to specify Hughes Silicon Junc- tion Diodes. They are first of all -for RELIABILITY! Diode glass body is coated with opaque black enamel, color - coded on cathode end. Available now in nine types: uo6OO1, HD60O2, HD6O03, HD6OO5, HD6O06, HD6OO7, HD6OO8, HD6O09, Ho6011. Ask for descriptive Bulletin sp -4.

Characteristics rated at 25 °C and at 150 °C. Ambient operating range, -80 °C to +200 °C.

Actual Size HUGHES SEMICONDUCTOR DIVISION

New York Chicago Aircraft Company, Culver City, California Los Angeles L III J

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 141 www.americanradiohistory.com Frequency Measuring (Continued from page 140) istics of devices which themselves are not frequency generators. An example of this is checking the calibration of cavity type microwave wavemeters. If a reaction type wave - meter is fed from a swept- frequency source, it will cause a "notch" in the power level received at the output end of the wavemeter. If that output power is then applied to the transfer oscillator, a harmonic of the local oscillator can be adjusted to the center frequency of the wavemeter notch. By this means not only the accuracy of the wavemeter calibration but also the effect of temperature and mechanical tolerances can be checked. A typical presentation observed on an oscilloscope with the set -up is shown in Fig. 11. Harmonic Numbers The harmonic that causes a given zero beat can be determined readily as demonstrated by the following example. If a frequency of 5,000 Mc New Shallcross "12000 Series" were being measured, a zero beat Oval Ceramic Switches offer could be obtained with a harmonic "custom- built" quality - without of 200 Mc. Assuming for the moment the delay and cost of specials. that the harmonic number were not known, the transfer oscillator would With only a few basic inter- be tuned to the next lower fre- changeable parts, constantly Shallcross 12000 Series quency that caused a zero beat. This stocked by Shallcross, over 1000 Oval Ceramic Switches would occur at an oscillator fre- different switch types can be quency of 192.307 Mc. At this fre- NON- SHORTING ACTION 40° or Delivery is im- - quency the harmonic number caus- quickly assembled. 60° indexing mediate. Your specifications are ing the beat is one greater than that SHORTING ACTION in- causing the 200 Mc. is matched exactly. -20° or 30° beat at It dexing thus possible to set up the expression The use of solid silver contacts OETENT- Optional. Positive -acting + 1) f2 and collector rings, low -loss stea- star wheel type. hlf1= (h1 where h1 is the harmonic at the tite decks, and silver plated beryl- POLES PER DECK -1, 2, or 3 lium- copper wiper pressure springs higher frequency f1, and f2 is the NUMBER OF DECKS -Up to 10 decks lower frequency. This expression assures uniformly low contact re- may be ganged. thus reduces to sistance and exceptional durability ADJUSTABLE STOP Available on hl f2 for a wide variety of instrument - - order fl - f2 switching applications. SHAFT -Completely isolated or in this example h1 For complete information on CONTACT RESISTANCE -0.0025 ohm, =25. "12000 Series" Switches, write, ±0.0002 ohm The harmonic number can be cross -checked by making a meas- wire, or phone for Shallcross Engi- RATINGS -110 v., la., 60 cy: nominal. urement with the next lower har- neering Bulletin L -32 which cata- 2500 v., 60 cy. -de -rated current. monic which would occur for a logs 275 most popular types. 40 amps-de -rated voltage. of the fundamental frequency of 208.333 Complete specifications in SHALLCROSS MFG. CO., 518 MC. Bulletin L -32. Pusey Avenue, Collingdale, Pa. The minimum voltage level on which it is possible to make measurements with the transfer oscillator naturally increases with the frequency to be measured. In all cases, however, measurements can be made with commonly available levels. At 200 Mc, measurements can typically be made with signal levels of approximately 200 .Lv. At 12,400 ShaI I cro Mc, the necessary signal level is SEE US AT THE WESCON SHOW -BOOTH 1220 approximately 100 mv.

142 For product information, use inquiry cord on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com PERMA -LOCK MIRROR GUARANTEES POSITIVE MIRROR ALIGNMENT

Only a Perma -lock snaps into position and slays in position. This inures positive mirror alignment, per focus after

every globe removal. Even a severe jclt can t disalign mirror.

only J-_G_ Mc Ali e r spots combine all 3

LIFETIME BEAM -PILOTS GUARANTEE FLARE-FREE DUAL CONTROL FOCUSES SPILL -PROOF LIGHTING BOTH FRONT AND REAR Encircling every Fresnellens -:one New dual -focus control is twice as are special, opaque bands, fused convenient, twice as accurate to the glass. These Beam Pilots as unsteady, old- fashioned one prevent flare and spill -light by lever focusing. Even -Action focus controlling side -beam deflecticn, is always smooth, absolutely and without losing useful light. precise and accurate from spot to flood positions.

TODAY, WRITE FOR COLORFUL NEW CATALOG-BROCHURE "VEW DIMENSIONS IN CONTROLLED STUDIO LITHTING"

world headquarters for the finest engineered lighting & production equ purent (sales and rentals). J G_ McAlister Iazc_ 1117 North McCadden Place Hollywood 38, California

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 143 www.americanradiohistory.com LABORATORY PROVEN Reading Head (Continued from page 100) sections (Fig. 3). The reading head FAIRCHILD is mounted on one section and has a groove or track machined around the periphery in which the tape or wire rides. This section is easily removed, and other similar sections may be substituted for different sizes of tape or wire. The section of the drum nearest the panel is fastened to the drive shaft and is not ordinarily removed. This section is cup- shaped with the open side toward the panel. A photoelectric cell is mounted on the panel, inside the cup- shaped section, close to the periphery of the drum. A small aperture in the drum wall makes it possible to focus an externally mounted lamp on the photocell when the drum is in the proper position. Each time the hole in the drum wall passes the light source, the light strikes the photocell and causes a small output pulse from the cell. The pulse is applied to a cathode follower which in turn triggers the oscilloscope sweep. The aperture in the drum wall is so located that the trigger pulse occurs just before the reading head makes contact with the tape, so that the oscilloscope sweep always begins slightly before the first pulse is sensed by the head. It is this timing system that provides a steady picture of the repeated playback signals on the oscilloscope Developed in the Electronic Laboratories of the Fairchild Guided screen. Missiles Division, the Fairchild Transistor Dynamic Analyzer incorporates in a single instrument all features necessary for testing transistor charac- Slip Ring Assembly teristics. During the past two years, this instrument has served as an essential Since the reading head is mounted tool in the Fairchild Laboratories for designing transistor circuits for use in on a revolving drum, electrical con- missile guidance systems. nections must be made through slip The Analyzer provides accurate and complete plots of static and dynamic rings and brushes. A specialized slip characteristics of Transistors - point contact and junction. Its principles are ring assembly using commercial basic, to meet future Transistor needs. Complete with all calibrating circuits brushes was designed and con- built in - only external equipment, a standard DC oscilloscope. structed for this purpose. The three rings are made of electrodeposited silver on a premachined bakelite cylinder; the silver is further machined for good contact surfaces. The cylinder is mounted between the drum and the driving motor, and a two - wire shielded cable runs from the slip rings through the shaft to the TYPICAL SCOPE PRESENTATIONS reading head. Presents on the Scope: Alpha vs Emitter Current Collector, Emitter and On the front of the panel are four Transfer Characteristics Collector Characteristics in Grounded Emitter grooved studs that guide the tape as Connection Sweeping Technique Shows Up Anomalies Complete it enters and leaves the reels and the families of curves obtainable in 10 incremental steps for each 5 ranges. rotating drum. Rubber shoes press- ing firmly against the studs prevent FENGINE AND AIRPLANE CORPORATION the tape from creeping while being scanned. Interchangeable studs are AIRCHILD provided for different sizes of tape and wire. Trials of the equipment in the laboratory prove its usefulness in locat- Wyandanch, L. I., N. Y. ing tape flaws and in reading re- (Continued on page 147)

144 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com ;9.44( THE WORLD'S

LARGEST MANUFACTURER

OF TRANSMITTING TUBES

10kw /cw UHF Klystron

250w Triode 20kw Tetrode High Vacuum Rectifier EIMAL TUBES For All Types of Communications, Industrial and Pulse Application!

Eimac offers a complete line of over seventy triode, tetrode, pentode, klystron and rectifier tube types to cover all types of electronic communications, industrial and pulse applications. The versatile Eimac electron -power tube family is second to none in frequency and power coverage. Even at ultra high and microwave frequencies, high power is no problem with Eimac amplifier klystrons. Up through the VHF region, Eimac negative grid tubes have been performance proved in every type of service. Internal or external anode, water or air cooled, metal, ceramic or glass construction, there is an Eimac tube to meet the most exacting requirements.

For further information contact our Technical Services Department. EITEL-McCULLOUGH, INC. S A N B R U N O C A L I F O R N I A

Reflex Klystron 5kw Tetrode 250w Tetrode

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 145 www.americanradiohistory.com Broader IRC service for your electronic and avionic components

IN LOS ANGELES, CALIFORNIA, IRCAL Industries These new IRC offers specialized experience in Encapsulated Wire subsidiaries 1 Wound Precision Resistors. Convenient West Coast specialize in (uRcL procurement, plus highly developed epoxy selected fields of techniques offer substantial advantages. advanced electron- ,Oar ics. Combined with IRC's leadership in components

engineering .. INTERNATIONAL Of IN ST. PETERSBURG, FLORIDA, Circuit Instruments Inc. provides precision potentiometers for critical QIRCMDÚ applications requiring reliability, sturdiness and ; INSTRUMENTS,INC. ' miniaturization. Write for catalog describing available types, sizes and ratings. a T PETERSeuRG s\-O they offer dependable, new sources for critical components and IN LOS ANGELES, CALIFORNIA, Hycor Company, Inc. broader IRC specializes in Precision Wave Filters, Variable service in all Attenuators, Toroid Coils, Audio Components and important elec- Magnetic Clutches. Hycor is a consistent pioneer tronic centers. in the development of critical components.

Write for data on the newest electronic and avionic

components of IRC and its subsidiaries, or visit

Wescon Show, Booths 818, 819 and 830, August 24 -26

INTERNATIONAL RESISTANCE CO. 401 N. Broad Street, Philadelphia 8, Pa. In Canada: International Resistance Co., Ltd., Toronto, Licensee

146 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Reading Head (Continued from page 144) corded pulses. The playback signal on the oscilloscope screen shifts such a small amount that photographs taken with an exposure time of 15 sec. reveal no evidence of blurring. Moreover, there is no noticeable noise from the slip ring and brush Convenient assembly. By expanding the oscilloscope sweep, it is possible to read a com- West Coast source puter word simply by recognizing

for ENCAPSULATED WIRE WOUND 0- PRECISION Fig. 3: Reading heads, for tape Ill, wire (r)

the value of each recorded digital RESISTORS pulse. The rotating head has been used in this way to compare information on a magnetic wire with the paper tape from which it was recorded. This method is used to determine whether the transcribing equipment is causing trouble or the wire is at fault. Subsidiary of International Resistance Co. Direct Transcription ...A revolutionary design in attenua- In addition to being an effective torsI and useful means of investigating PROOF against SHOCK -MOISTURE magnetic recording phenomena, the -TEMPERATURE. MIL -R -93A Types rotating -head type of reader could Withstands ambient temperatures of 40°C. to + 70°C; 95% humidity. TRU -MITE Encapsulated Wire Wound Pre- also be used as a moans for trans- - Resistive elements are accurate, non - cision Resistors offer assured stability and cribing information from directly the inductive, wire -wound and hermetic- long life under adverse climatic con- keyboard to the magnetic tape. It ally sealed in a special tough plastic ditions for either high or low ambient tem- would be most convenient to use a compound. peratures. All exterior surfaces are pro- multichannel tape together with Greater power dissipation. tected against salt water corrosion and some provision for advancing it in Switch surface flat and smooth ... electrolysis. Use coupon for engineering short, precise steps. Each time a key easy to clean, BRUSHES CANNOT bulletin covering sizes and specifications. TRIP, exceptionally long life. on the keyboard is pressed, the cor- QUIET...extremely low switch noise responding character in coded form level ... ideal audio mixer controls. is set up in an electronic register. "Lubricated for life" bearings. Then at a specific point of the rotat- Stock types available with "LADDER," ing drum revolution, the contents "T," "H," "L," and potentiometer are recorded on the tape in parallel configurations up to 32 steps. form. On the next revolution of the Send for Bulletin A -2 for specifica- IRCAL INDUSTRIES tions and prices. Department C, 2240 5. Sepulveda Blvd. drum, the character just recorded is Los Angeles 64, Calif. compared with the character stored Send Engineering Data Bulletin on TRU -MITE Resistors to: in the register. If the two agree, the Nome tape advances a small distance, and Representatives in Company the next key can be depressed to Principal Cities begin the next record -read -check Address cycle. If the two characters do not City State agree, the tape advance mechanism is locked out, an error indicator flashes, and the operator can either try to record again or find where the difficulty is. In this way, an operator could transcribe his problem directly from his manuscript to a 11423 VANOWEN STREET magnetic tape, which then could be NORTH HOLLYWOOD 2, CALIF. read directly into the computer.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 147 www.americanradiohistory.com D- Amplifier (Continued from page 101)

A(o)w.rr, the cutoff frequency fete = w.tt /2rr is determined by simple graphical integration (counting squar -es) 8. (K' in Fig. 3 is identical with 1/K in eq. (5). While the exact determination of f.tt may be laborious, and is not always possible due to integration difficulties, the use of fat in the laboratory is quite simple. Its value as a design factor stems from the fact that it is based on the transient SPEEDY PATHS TO SUCCESS FOR MEN slope, via the Fourier integral; in the general case determined by both OF TALENT AT absolute gain and phase charac- SYLVANIA teristic of the amplifier. Full use of Career positions with the bandwidth index f tv can only ELECTRONIC SYSTEMS DIVISION be made, however, if sufficient theoretical work is carried out as a back- Between 1947 and 1953, the electronics industry grew bone for the experimental work, and 32 %. 24% ...Sylvania grew f Iv is here included merely as a tool That is why Sylvania today offers important paths for relative comparison of different to quick success for men of talent. amplifier designs. Here, individual achievement is swiftly recognized and rewarded, as witness the fact that the average age of top level executives is only 45. In this stimu- Modern Ladder Networks lating Sylvania atmosphere, original thinkers can and do go far. Again excepting transmission -line tubes from the discussion, we note BOSTON BUFFALO that the ladder structure has pro- Laboratory Engineering gressed from simple constant -k sec- Majors in E.E., M.E., Majors in E.E., M.E., tions to capacitively shunted m -de- Math, Physics. Research or Physics. Experience rived sections, and other types of & Development experi- in Product Design and lattice sections, yielding a straight- ence in- Advanced Develop- ened -out differential time -delay Countermeasures ment in- characteristic and, for best pulse re- Systems Analysis production, a transmission Transistor Applications Circuit Design charac- Noise Studies Systems Development teristic following through the 3 db Antenna Res. & Dev. Pulse Techniques point the normal probability curve, Systems Development F.M. Techniques known as the Gaussian curve. As Mechanical Design Equipment Specifications the number of circuit elements per Miniaturization Components section have been increased, the Digital Computer Microwave Applications possibilities for juggling values have Circuits & Systems Servo Mechanisms also been increased, and thus the Circuit Design Subminiaturization systematic network synthesis ap- Shock & Vibration Mechanical Design Technical Writing Shock & Vibration proach has become more appreci- Missile Analysis Heat Transfer ated in spite of its drawback of for- midable computation work.lz INTERVIEW AND RELOCATION EXPENSES It is well-known that the tube in- WILL BE PAID BY SYLVANIA put grid conductance, increasing Sylvania provides financial support for advanced with the square of the frequency, education as well as liberal insurance, may be utilized to turn an otherwise pension and medical programs. rising gain or transmission charac- Please forward resume to: teristic into a flat or properly falling Professional Placement Supervisor curve; at least within a limited fre- SYLVANIA ELECTRIC PRODUCTS INC. quency interval. Improved results Thomas A. Tierney Randall A. Kenyon are possible, however, with Con- 100 First St. 175 Great Arrow Ave. trolled Dissipation from artificially Waltham, Mass. Buffalo 7, N. Y. inserted resistors, and a first attempt might here be to insert small resistors in the grid and plate leads of each tube. With or without such SYLVANIA added dissipative elements, a lattice SYLVANIA ELECTRIC PRODUCTS INC. network, or its corresponding bridge inquiries will be answered within two necks Your circuit, provides the best possible starting point, since it is basically an all-pass network. In our aim for better pulse amplifier performance, we

148 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com must be prepared to give up some gain- bandwidth product. Thus, while both d -c gain and cutoff frequency may be reduced, a better amplifier Etched Circuits that for millimicrosecond pulses of small rise and decay times results. The principle of dissipation control has been described by Flood and Till- man ", and practical design data con- WON'T PEEL OFF! tributed by Bassett and Kelly.' We will here discuss the Bassett -Kelly Network, Fig. 4, which has the dissipation element aRa /2m located in the shunt arm of a simple m- derived section, with m > 1. (Note that Lk in Fig. 4 is expressed as Lk /2 in Ameri- can standards; 2Ck as Ck.) For a = 0 the image impedance is resistive in the pass band, but for a > 0 we must match to complex image impedances. Accordingly we find ourselves forced to use lossy terminating sections, in which m has a different value, m < 1. (For example, inside the ladder networks m = 1.3, in the terminating sections m = 0.6.) To give an idea of how D- amplifier sections such as the one shown in Fig. 4 may be treated analytically, we will demonstrate the principle by choosing the simplest case; m = 1 and a = 0, i.e. the constant -k sec - tion.12 Cutting the grid line section along the line a -b, and doubling the shunt -impedance values, we provide a PI- terminated L- section, which can be treated as a potentiometer's so that the grid voltage directly ob- Using an exclusive USECO process our tains as (using American standards) new "Wrap- Around" circuits eliminate peeling! V, n V. _ -tan -t (6) Vi -n2 Vi -n2 If you've had trouble with peeling, be sure to investigate the Here i is the frequency variable td /toe, and we the filter cutoff fre- advantages of USECO's "Wrap- Around," "Plated -Thru" and quency (not the appreciably lower "Flush" etched circuits which give you: amplifier cutoff frequency). Pro- ceeding to the section in the plate correct plating extreme accuracy line, we apply the method of Ginz - ton, Hewlett, Jasberg and Noe,° and excellent pattern definition better contact fold the circuit around the line c -d, easier unplugging longer service life obtaining V2 = -Ra Ip /2 of the same phase angle as has Vg. Since 1p = manual which gives suggestions g,,, Vg, the complex amplification of Write for revised engineering one amplifier section becomes on preparation of master drawings and complete information gaR0 on how to order. Please address Dept. 5 A(n) - 2 V1 -ne Complete line of electronic hardware, including standard and n special terminal boards. World's largest stock of silver plated - 2 tan -t (7) ,/ï -n2 terminal lugs-over 21 million pieces. The absolute value of this represents See our complete display at WESCON Show, Booth No. 132 the transmission characteristic. The phase function (absorbing the - sign in front of A(n) as + n) provides the plot of the phase characteristic. U. S. ENGINEERING CO., INC. Its n- derivative yields the differen- A Division of Litton. Industries, Inc. tial time delay curve, 521 COMMERCIAL ST.,-GLENDALE 3, CALIF. (Continued on page 175)

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 149 www.americanradiohistory.com NEW HORIZONS New Technical Products IN DIRECT VISUAL RECORDING -WITH ALFAX PAPER-"ELECTRICITY IS THE INK" For Electronic RECORDING the THE ALDEN ADJUSTERLESS TECHNIQUES COAXIAL CABLE MICRO -MINIATURE RELAY With Allow Paper "Electricity is the ink" -providing a wide ronge of tone responses-faithful to Two new coaxial cables, 93 -3913 and The CR2791G200 hermetically -sealed the amount of current passed -capable of operat- relay is less than 1.0 in. high and ng at very slow and very high writing speeds- 93 -3914, have capacitance with just with low current requirements-entirely new possi- 12 µµf /ft. The O.D. of the cables is held weighs only 10.0 grams. Contact rating bilities in the field of direct visual facsimile and is 2 amps resistive lead at 30 v. dc., instrument recording have been opened up. to 0.132 in. max. therefore three of or them can occupy the equivalent space 115 v. ac. Rated for operation at 1.5

Alf ax Paper, wedded to patented Alden Adjust - erless Recording Techniques provide the optimum recording pressures and accuracies for the fullest utilization of Alfas Paper, mode possible a new recording method for instrumentation that cap-

tures electronic pulses i nstontly and directly on paper without pens, inks, Cathode Ray Tubes, photography or secondary means, and new automatic, continuous facsimile recorders that provide facsimile recording systems that ore the fastest, most accurate means of getting information over of one RG62 /U. Their characteristic milliseconds. Sealed beryllium- copper transmission links today. impedance is 98 ohms. Cellular poly- contact springs hold adjustment in- definitely. rating is Write for Booklet ethylene dielectric construction con- Shock over 50 G's. Vibration resistance is 10 -55 cps at "RECORDING WITH ALFAX" tributes to a velocity of propagation of 80 %. A thin wall of nylon under the 0.12 in. max. excursion, and 55 -500 CPS ALFAX PAPER AND ENGINEERING CO. braid permits soldering both center at 20 G's acceleration. Standard coil WESTBORO 9, MASS. conductor and braid. Temperature rat- resistance, approx. 600 ohms for 28 v. "FLYING SPOT" RECORDING SIMPLIFIED BY ing is -65° to +120 °. Samples and dc. operation; 4,800 ohms available. The NEW ALDEN TECHNIQUES AND RECORDER CR2791G210, a COMPONENTS. specifications available at Microdot, current sensitive model, 1826 Fremont Ave., South Pasadena, 1,12 in. high, has 9,600 ohms, 3.2 ma. Alden Adjusterless recorder techniques built into these recorders enable you to explore the new hori- Calif. -TELE -TECH & ELECTRONIC pickup current. General Electric Co., zons opened up by Alfas paper, while insuring you INDUSTRIES. (Ask for 8 -23) Schenectady, N. Y. -TELE -TECH & fullest utilization of Alfas characteristics. ELECTRONIC INDUSTRIES. (Ask for nur,.. eucoemes EErcrxo.e. INSULATING COMPONENTS 8 -26) ° Three new insulating components for the 21 -inch tri -color tube consist of an TANTALUM CAPACITOR From 2" insulating ring (Part # 21 MCT 7 -1), an This is a new refinement of the XT to 19" 21 7 paper insulating cone (Part # MCS -1), capacitor, featuring a method of in- widths and a magnet insulator Part # 21 MCU tegral mounting that withstands heavy 7 CASES VASES FEE°ER9 -1). The interlocking and overlapping shock and vibration. The capacitor has design of the units assures sufficient a threaded neck which fits through a Alden Adjusterless Helix Recorder Components go together easily to build your own Facsimile creepage path and completely cover the keyed slot in the chassis. Also is sup- Recorders in sizes for every need. exposed metal shell and flanges of the plied with a lock washer and hex nut Available from in to TO GET RESULTS LIKE THESE: kinescope tube. stock hold the unit securely in place. The

Helix replaces cathode ray Alfas recording of magnetic screen -records it scan detects flaws in gon barrels at government arse- nalMIN

Microsecond accuracy test News pictures for TV with - equipment to check a tele- out photography graph system Write for Booklet small quantities; on short notice for capacitor operates at ambient tempera- "NEW HORIZONS IN INSTANT large production quantities. Insulating ture from -55 °C to +175 °C and can VISUAL RECORDING" components for other color tube types be supplied for use at 200 °C. Available ALDEN ELECTRONIC AND IMPULSE also available. Anchor Industrial Co., in a wide selection of ratings. P. R. RECORDING EQUIPMENT CO. 36 -36 36th St., Long Island City 6, N. Y. Mallory & Co., Inc., Indianapolis, Ind. - TELE -TECH & ELECTRONIC INDUS- WESTBORO 9, MASS. TELE -TECH & ELECTRONIC INDUS- TRIES. (Ask for 8 -25) TRIES (Ask for 8 -29)

150 For product information, use Inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com TENSOLON Industries WIRE & CABLE DYNAMIC MICROPHONE The Model 664 variable D cardioid dynamic microphone, for public ad- For an extra dress, recording, communications, etc., provides uniform cardioid polar pat- margin of dependa- tern at all frequencies and response at bility at maximum operating temperatures, specify Tensolite's rugged Teflon`" insulated wire and cable products. Resistant to all cnemical$i ana solvents, ienon combines minimum . Du Pont wall thi n" ess with highest dielectric strength

Extruded Teflon insulation to meet the requirements of MIL- W -1687M Types E and EE, sizes 10 -30 AWG in 14 solid colors and spirally striped. Parallel wrapped Teflon - exclusive patented construction featuring super -flexibility, sizes 20-34 AWG in 14 solid colors to MIL- W- 16878A TEFLON Types E and EE. INSULATED Spiral wrapped Teflon - special cross -lapped construction with spiral striping conforming to commercial (GEN -104) and military (MIL -W.76A) HOOK -UP specifications having the standard stripe width, lay and spacing. WIRE Sizes 8 -30 AWG to MIL- W-16878A Types E and EE Specification. NEW 5 mil wall subminiature Teflon hook -up wire for applications where space factor is extremely critical. Sizes 26, 28, 30 and 32 AWG in 4 solid colors.

Teflon impregnated fibreglas braid over Teflon insulated wire for high temperature motor and transformer leads. Sizes 8.32 AWG, solid and TEFLON tracer colors. all frequencies from 60 to 13,000 ces. LEAD WIRE Silicone lacquered fibreglas braid over Teflon insulated wire for Output level, 55 db, 150 ohm and high class H applications. Sizes 8.32 AWG, solid and tracer colors. impedance. Impedance changed by moving in All of the above described hook -up and lead wires are available with one connection connector. closely woven wire braid shields to all military and customer Shielded from dust and magnetic SHIELDED specifications. particles. Swivel enables aiming for TEFLON WIRE 100% shielding provided with a close -fitting drawn copper or alumi- most effective pickup. MC4M connector num tubing available on request. with 18 ft. cable. Size, 17/s in. diam., Ultraflexible slip -on insulation for 20 -30 AWG sizes available in 14 736 in. long. Electro- Voice, Inc., Bu- TEFLON TUBING solid colors. chanan, Mich. -TELE -TECH & ELEC- TRONIC INDUSTRIES. (Ask for 8 -27) New improved Teflon- glass -Teflon sandwich construction providing TEFLON superior resistance to abrasion and vibration, as well as increased margin of safety for overload protection and emergency operation. AIRCRAFT WIRE Conforms fully to MIL-W7139A, available in sizes 6 to 22 AWG. REMOTE CONTROL UNIT Teflon outer jacket cross -lapped and fused to provide an impervious Models 108 -OD and 108 -1D have been and flexible covering completely resistant to all corrosive chemicals. designed for use in directional Available in 10 solid colors, or spiral striped, sizes 10 -30 AWG. and JACKETED multi -transmitter installations where Teflon impregnated or silicone lacquered fibreglas braid outer cover - SHIELDED ing over shielded Teflon insulation. These class H cables are available up to 24 control and metering func- in solid and tracer colors, sizes 10 -30 AWG. tions are required. Complete in every TEFLON Extruded vinyl or nylon jackets over shielded Teflon wire for high INSULATED frequency, moderate temperature applications. All standard sizes and respect, they are custom engineered to colors. each station's specifications. Features CABLE Nylon lacquered nylon braid outer covering over shielded Teflon wire include drop down panel construction, for extra rugged applications at temperatures not exceeding 1206C. Solid colors and tracers, sizes 10 -30 AWG.

50, 70 and 93 ohm extruded Teflon insulated miniature coaxial cables with extruded vinyl, nylon or Teflon outer jackets. Also available with lacquered over -braids. MINIATURE Finished coaxial cable assemblies are now being supplied with minia- TEFLON ture connectors and fittings. COAXIAL Copper or aluminum clad miniature Teflon insulated coaxial cables for rugged applications with extreme size and weight limitation. The CABLE semi -rigid nature of this construction minimizes self -generated noises. Flexible low-noise miniature Teflon insulated coaxial cables are also available on request.

Teflon insulated conductors cabled together to exact customer MULTI. cnarifratinne CONDUCTOR Shielded multi -conductor Teflon insulated cables. Teflon outer jacket, silicone or Teflon impregnated fibreglas braid TEFLON and nylon lacquered nylon braid over shielded multi- conductor Teflon CABLE insulated cables are available for numerous specialized applications in telemetering and instrumentation.

CUSTOM Tensolite's development facilities are ready to assist you in the design and selection of special Teflon wire, cable and thermocouple no tubes, and the finest components. TEFLON CABLE constructions as well as custom wire assemblies and harnesses. Consulting service and complete interconnecting diagrams are offered to I as- I WRITE FOR sure proper installation. Rust Industrial CATALOG Co., Manchester, N. H.-TELE -TECH & INSULATED WIRE CO INC ELECTRONIC INDUSTRIES (Ask for TArrytown 4.2300 198 MAIN STREET, TARRYTOWN, NEW YORK 8 -28) L

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 151 www.americanradiohistory.com BURROUGHS Engineering Management In a Growing Laboratory facilities available Differences between small and large R and D organizations, for subcontract work problems enc ountered by the small lab as it grows. By R. E. SAMUELSON Whenever a new gineers of the laboratory. The project Research and De- leaders report directly to the chief velopment labora- engineer. To each project leader are tory is first con- assigned the requisite number of ceived, its founders scientists, electrical and mechanical en- hope for recognition gineers, lab assistants, and design and prosperity. If draftsmen, who work together in an this comes to pass, assigned area throughout the job. the laboratory will certainly grow. If it continues to grow, Procedures R. E. Samuelson it will some day get to be a big R and One the most difficult, yet impor- D laboratory; and of at this point one has tant management functions, is the visions of a complex organizational foreseeing of necessary formalized pro- structure, a highly systematized cedures and selection and setting up method of operation and vast rows of of adequate ones. The number of mis- people at drawing boards, desks or laboratory cellaneous special procedures should benches. to a minimum and reliance At this be kept point arise two questions: made on good judgment as much as First, what sort of avoidable growing possible. However, when a given prob- pains were involved in reaching the repetitive, its is large laboratory status? lem becomes solution Second, must best handled by a standard procedure. the small organization undergo a com- procedures plete metamorphosis through growth Most important, such should be set up with a view towards their and lose its many desirable characteristics? The workability in case the organization answers may be found in should grow to many times its size. the case history of the Motorola Re- in search Laboratory in When a development is completed Phoenix, founded the Phoenix laboratory and is ready early in 1949, with a small number of engineers and to go into mass production in one of supporting people. the Chicago plants, the transition takes Specialists in digital From a small beginning the labora- place with a very minimum of confu- tory has grown to a total population of sion since all drawings, bills of mate- and pulse around 800 people, of which about 175 engineering specifica- techniques are professional-grade rial, and other engineers and tions are written in the same language scientists. It was decided at an early and the same form. Expand your production without date to maintain the desirable features When a person accustomed to work- of a small organization adding capital investment. Let throughout its ing as part of a small organization growth and accordingly, the structure does work with a large organization he Burroughs Electronic Instruments has been kept The red simple. tape has is often amazed at the amount of Division build your electronic assem- been held to a minimum. interoffice memoranda, reports, and As the size of the organization begins all blies or magnetic devices. Especially need seemingly endless conferences, of to grow, there is also the for more which he naturally labels as red tape, skilled and equipped for manufac- predetermined procedures. In the large without stopping to think that two turing in the digital and pulse fields, organization the problems of stock here. Ac- factory and categories are represented standardization, practices, one is red tape, but a good including prototypes and pilot sys- quality control make mandatory a tually, part of the items involved in it are tems. Facilities for complete testing well thought -out and detailed part communications made necessary by the from finished systems to components. numbering system. requirement that members of a large Large technical staff. Burroughs Structure team must know what the other members are doing and plan to do. offers you dependability, experience, As the laboratory grows and it be- As the complexity of the communica- security. Located in the heart of one comes necessary to departmentalize, tion problem is reduced, the important there arises the necessity for a choice easier to recognize. It largest pools items become of America's of trained of what kinds of departments to create is then possible to sort out the purely electronics personnel. Write for quo- and how to split up and delegate re- red tape items and eliminate them by sponsibility. In the Motorola laboratory tation. Burroughs Corporation, Electronic strong management action. the organizational structure has pur- In conclusion, let it be said that the Instruments Division, 1209 Vine Street, posely been kept simple. The director problems of a growing laboratory, or- Philadelphia 7, Pennsylvania. of the laboratory reports directly to ganizational complexity, standardization the top management of the company in of procedures, and internal communi- Chicago and the five departmental cations, can be minimized through heads report directly to the director. vigorous and forward -looking manage- ELECTRONIC INSTRUMENTS DIVISION The chief engineer, the heads of pro- ment action. duction, accounting, purchasing, and personnel also report to the director. The R and D activity is separated R. E. SAMUELSON is Chief Engineer of the FIRST IN PULSE HANDLING EQUIPMENT into project groups, each under a proj- Research Laboratory, Motorola Inc. ect leader chosen from the top en- Phoenix

152 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Magnetic Amplifier How BURROUGHS PULSE UNITS (Continued front page 91) power, but rather by requiring a minimum amount of input power for help engineers get more done full control of its output. The window area of the cores in the first 1. Save time getting started stage is essentially filled with control winding copper. A large num- Lose no time designing and build- ber of turns is wound in the control ing special pulse test equipment. windings to increase amplifier sensi- To form the pulse system you need tivity and to keep the current and -simple or complex- simply con- power required from the thermo- nect together Burroughs Pulse couple to low values. The open-loop Units. Units mount in a standard input circuit resistance is matched rack. Use standard cables. It only to the resistance of the thermo- takes minutes. couple for a maximum transfer of Because of matched power. this 2. Try new ideas condition of the input circuit, the wire size and number of turns in Burroughs Pulse Units are so easy the control windings are determined to use you can try many new ideas by the resistance of the thermo- you might otherwise never find couple. time for. If you work with pulses, The first stage output circuit is you need these new engineering tools. operated at a relatively low supply

+4o 3. Correct errors fast

z 13.0 -_ Now if you discover an error in to cc ,n planning your pulse system, you 7s lose none of your equipment invest- U1-ß _ ,__ ment. Simply reconnect the cables ná i ,a-J and correct the error. Burroughs DJ-i1.0 units let you experiment with differ - ozu ent :n rot ements. -6 -4 -2 +2 4 +6 DC CONTROL CURRENT 4. Speed completion

IN MICROAMPERES 1 0 of engineering I 1 RATED in -2 0 VOLTAGE 120 V Every day lost engineering post- RATED pones product delivery. Save valu- FREQUENCY 800., able engineering time. Equip your -3.0 LOAD RES. 32031E laboratory with Burroughs pre - C ONTROL engineered pulse units. Make it -40 RES. (TOTAL) 5611 easier to meet your deadlines.

Fig 6: Open -loop characteristic curve 5. Use equipment voltage, and the load winding con- over and over again tains only enough turns of a small There's no waste with Burroughs wire size to this voltage. support Pulse Units. Usually you save on The of detrimental effects recti- first application. Then you can fier leakage currents are minimized the because use them over and over again on the operating voltage is different future projects- saving well below the inverse rating voltage many times more over the life of of the rectifiers. Any leakage current the equipment. that might occur flows through a relatively few load turns, and no appreciable leakage mmf is pro- CAN BURROUGHS duced in the core to effect a change CORPORATION in gain. The power output from the HELP YOU ? first is made low it is ELECTRONIC INSTRUMENTS DIVISION stage because If you have an engineering problem only necessary to provide sufficient Dept. 2 -H, 1209 Vine St., Phila. 7, Pa. involving pulses, write Burroughs. power to drive the second stage Send me literature on Burroughs Pulse Without charge, we'll engineer your over its full output range and force Units. system for you, showing what. its Burroughs Pulse Units you need and response. The second stage, how- Name how much they cost. Prove to your ever, is operated at a higher voltage management how much you can save because it supplies the output power Position and how much more you can get to the load circuit. Company done. Write today or send coupon. The negative feedback voltage is ENGINEERS : The Electronic Instruments Division of Street the Burroughs Corporation now offers excellent opportunities to experienced electronic development (Continued on page 154) City Zone.... State engineers. Write Engineering Manager.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 153 www.americanradiohistory.com Magnetic Amplifier (Continued from page 153) obtained from the load circuit of the second stage which is essentially resistive. The basic gain of the two stages combined is sufficiently high to permit the application of a large amount of negative voltage feedback around both stages without decreasing the over -all amplifier sensitivity below that of the thermocouple requirements. The negative feedback voltage produces the following desirable results: over -all amplifier stability is increased; amplifier linearity matches the linear thermocouple characteristic; over -all response time is reduced; and the input impedance is increased to a value which is many times higher than the ohmic resistance of the input circuit. A high input impedance is desirable for a thermocouple amplifier because it makes the amplifier essentially a voltage- sensitive device whose gain is independent of the changes in thermocouple resistance. It also limits the current drain from the thermocouple to a low value and minimizes the voltage drop in the leads. As a result, a larger signal voltage is obtained at the amplifier input.

Zero Drift High gain and negative voltage PARABOLIC feedback are effective in maintaining a stable over -all gain character- ANTENNAS 44,1 istic, but the problem of zero stability is that of maintaining a well - balanced amplifier for all conditions Designed and developed by Gabriel to meet or surpass civilian of operation. Both high gain and and military specifications for K -band operation, these parabolic high input impedance are effective antennas are produced with dish diameters of one, two, three, and in the sense that a given drift in the four feet. output current is reflected as a small amount of input power to restore Precision. reflectors are illuminated by a modified Gabriel the output current to zero. The wave -guide feed - the same Gabriel design that has received amount of output drift, however, is universal recognition in the 7000 -mc commercial relay band. The determined by the degree of un- UG -419/U input flange of this feed is suitable for use in pressurized balance in the amplifier. The pre- cautions taken to insure low zero systems. Three- or four -point adjustable mounting is standard. drift were to carefully select and Frequency coverage - 12,700 to 13,200 mc. match both core and rectifier characteristics. The cores are made of a VSWR - less than 1.3:1 through entire range temperature stable core material and Each antenna can be spot -tuned to a are matched for gain and bias char- specific frequency, at slight additional cost. acteristics with a dynamic core testera. Each pair of cores is indi- Large orders for K -band antennas can be filled quickly; the vidually biased to offset any mis- two -foot and three -foot sizes are available for shipment from stock. match that might exist (Fig. 4.) Rec- tifiers with stable characteristics and For analysis of your antenna or microwave problems, negligible leakage are used. They write us 3 (through Boston). or telephone Needham -0005 are matched so that any changes that occur produce equal changes in the GABRIEL ELECTRONICS DIVISION load currents of the individual amplifiers which cancel in the common THE GABRIEL COMPANY. Needham Heights 94. Massachusetts load. Thus, a balanced amplifier is maintained. The resistors used in the

154 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com circuit are wire wound and are de- for direct measurement rated to insure a high degree of of electrical, mechanical stability. or optical events

Amplifier Response The LaPlace transform for the system is given by eq. 1. By letting s: T, = rT2, b, the damping coefficient is: new 1+r SIZE. ô = 2Vr(1 -}- ß K,K2) and wo, the undamped natural frequency is:

1 I l -F ß KIK2 Iva = - Tx r the output response to a step input Ka voltage is: EXCELLENT LOW FREQUENCY ACCURACY The new DS- 6100 -T has an accuracy K,K2Ka of ± 1) microseconds over the Eo(s) = x (3) frequency range of 1 to 10,000 events rT22 s(s2 +28wos+ 02) per second. In addition, frequencies of 10,000 to 100,000 events per new ! second can be measured with an This is a second order equation, and accuracy of ± one count ± one part the type of response depends on the In 100,000 (one part In 1,000,000 amount of damping in the system. DS- 6100-T with crystal oven). Critical damping for a high -gain SPECIFICATIONS system with a large feedback ratio FREQUENCY COUNTER FREQUENCY MEASUREMENT Frequency Range -10- 100,000 cycles is obtained with a ratio, r, of ap- per second proximately 200. Most thermocouple New Low Cost! Input Sensitivity- applications, however, do not re- 0.1 volt RMS: 20- 100,000 cps quire a critically damped response 0.25 volt RMS: 10 -20 cps New Light Weight! Accuracy -± 1 count ± stability because thermocouple time con- Time Base -1 and 10 seconds (0.1 stants are of the order of seconds A compact frequency second optional) precision Read -Out -Cycles per second: and are not likely to produce step counter designed for direct measurement Five digits changes of voltage. An amplifier of any electrical, mechanical or PERIOD MEASUREMENT with an under -damped response optical phenomena which can be Frequency Range -1- 10,000 cycles whose total response time is faster converted into a varying voltage. Reads per second than the thermocouple will faith- out in direct digital form requiring Input Sensitivity -0.1 volt RMS fully follow the slowly varying no interpolation or reference to Accuracy-± 10 microseconds signals from curves or tables. The all new Gate Time -1 and 10 cycles of un- the thermocouple. DS- 6100-T is ideal for use by skilled known frequency. May be increased unskilled by multi- sampling (only below or personnel. Price $700.00 5 cycles per second). Amplifier Design Read -Out -Tens of microseconds EXCLUSIVE FEATURES GENERAL The schematic circuit diagram for at no extra cost... Stability -1 part in 100,000 the low -level amplifier is shown in TEN CYCLE GATE (1 part in 1,000,000 with crystal oven) Fig. 4. The circuit is a balanced increases accuracy of period measurement Display Time -Automatic: continu- M ULTI.SAMPL ING ously variable from 1 to 10 seconds. self -saturating, push -pull, full-wave manually scans the unknown frequency for Manual: until reset bridge circuit. Cores for both stages any multiple of the time base Inp-at Impedance -0.5 meg., 0.05 mf are of Supermalloy core material for greater accuracy Power Requirements -117 volts -I- BATCH COUNTING 10%, 50 -60 cycles (50 -400 cycles and have the same iron cross optional); 150 watts sec- NEW, IMPROVED SENSITIVITY tion area. The first-stage Dimensions -14 V." wide x 71,x" high x cores, 131:" deep however, have a larger mean di- Weight -28 lbs. net (approximately) ameter than the second -stage cores to accommodate the control wind- VISIT I'S IN ings necessary for the desired sen- Booth 824 -WESCON . sitivity. The ratio of control winding Civic Auditorium. S.F. copper to load winding copper is THE CORP. 6.10:1 for the first stage and 0.46:1 'Trade Mar COMPUTER -MEASUREMENTS DIVISION for the second stage. The second TECHNICAL 5528 Vineland, North Hollywood, Calif. Dept. 89 -8 stage operates at a higher input sig- REPRESENTATIVES: NEW VOIRE & 01110. SO. MICH.. WASHINI:TON.OREGON. SO. CAR.. GA.. NO. NEW JERSEY AI.A.&}I.A. nal level and does not require as W. IDAHO. MONTANA Southeastern Industrial Instruments Gerard G. I.enln Cmmnany Michael J. III. by Company Testcn Atlanta, Ga. EX. Great Neck. 7901 high a ratio. Because it supplies the N.Y. 111lnter24710 ('M ener 10, III. SU, 4-5/150 Seattle S. Wash. MO. 3193 SO. NEW JERSEY & NO. ILLINOIS. INDIANA. output power to the load circuit, the EAST PENNSYLVANIA SO. WIS.. E. IOWA CALIFORNIA. ARIZONA. KANS., W. IOWA Engineering Louis A. Garten & Associates Warren 11. Co a Conlonny NEVADA Services Company St. louis 5, Mo. VO. :1 :1661 load winding is designed for this op- Montclair. N.J. MO. 3 -0257 Evanston. III. r DA. 44.40014 Koessler Soles Company Branch COLORADO. W'YO., Los Angeln 38, Calif. YO. 6271 Ogee: MARYLAND. D.C.. VIRGINIA. Kansas City. Mo. JE. 7765 eration and occupies most of the NO. CAR.. TENN. E. IDAHO, UTA11. NEAR. Brand. Orrrr. S. S. Lee Associates Allen I. Williams Co. San Francisco 16. Calif. JO.7.0622 CANADA available winding area of the core. Washington 6. D.C. EM. 24626 Denver 4, Cnk,. MA 30313 Electromechanical Products Rranrh ORrr: NEW MEXICO & MINN., NO. WIS.. NO. MICH.. Agincourt. Ontario. 49:1.11-2 High -quality selenium rectifiers IlaIliu,ore 20. Md. AR. 0742 EI. PASO COUNTY. TEXAS NO. & SO. DAK. F. X PORT Rennes I. Allen William. Company Industrial Representatives Company Frazer & Hansen. 1.1,1. (Continued on page 156) Winston- Salem. N.C. 5.0160 Albuquerque, N.M. AL. 5 -9632 Minneapolis 16 Minn. N'}:. 0.9010 301 Clay SL, San Frandsen. Calif.

TELE -TECH 8. ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on lost page. 155 www.americanradiohistory.com Magnetic Amplifier (Continued from page 155)

are used for both stages. One cell per leg permits operation with negligible rectifier leakage effects in the foot first stage, but because of the higher operating voltage, two cells per leg are used in the second stage. A full- TRANS -HORIZON wave selenium bridge rectifier connected to the supply voltage supplies the dc bias voltages. A step-down ANTENNAS transformer supplies the low operating voltages for both the first and N second stages. available OW Resistive mixing is used in the the mixing resistors Field proven for two years in over amplifier and are RM1 and RM2, respectively. The 50 installations, this versatile, rugged antenna resistors are selected to produce is currently available from stock. maximum amplifier stability. The first -stage load resistor RL1f a large resistance, is connected directly in series with the control circuit of the second stage. The power output from the first stage drives the second stage and forces a fast response. The negative feedback voltage is developed across a 3 -ohm resistor in the output circuit and is connected in series with the thermocouple voltage at the input circuit. Total resistance in the output circuit is 3203 ohms. The load consists of an indicating meter and the control circuits of the relay amplifiers. Auto- matic cold junction compensation and temperature biasing circuits may be added to the thermocouple amplifier without affecting its operation. The compensating voltages are applied across the control circuit resistor R0. A reference device is needed to provide a reference temperature when these circuits are used.

Performance A numerical tabulation of amplifier characteristics is presented in Table I. The characteristics are de- This 28 -foot antenna in Lexington, rived for a particular thermocouple Mass. is used to study the SCATTER application and do not represent principle of radio propagation. It is operated in conjunction with a similar limiting conditions for the amplifier. antenna in Syracuse, N. Y. (about The amplifier exhibits an ex- 250 miles away) at a frequency of tremely linear relationship between 915 mc. The special mount, also output current and input voltage as designed by Kennedy, allows the antenna to rotate 360° in azimuth shown by the characteristic transfer which gives added flexibility for ex- curve on Fig. 5. This curve defines perimental purposes. the amplifier's operation for rated conditions and was obtained from the open -loop characteristic curve (Fig. 6) by the application of negative voltage feedback around both ANTENNA EQUIPMENT stages of the amplifier. The feedback ratio, ß, is 0.938 x 10-8, and the . KENNEDY & CO. measured open -loop voltage gain K1K2 is 71,000. The product ß K1K2 COHASSET, MASS. - TEL: C04-0699 is 66.6, and the closed loop voltage gain 1 /(3 is 1065 (Eq. 2). The actual

156 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com ACTUAL SIZE measured closed -loop voltage gain (2 WATTS) is 1045 which is very nearly equal to the computed gain. Varying conditions of voltage, frequency, and ambient tempera- STABLE ture tend to change the amplifier's characteristic curve, and the magnitude of the changes is indicative of at the amplifier's stability Quantities that infer stability are sensitivity, linearity, zero drift, and accuracy. Sensitivity -is the average slope of the characteristic curve. The slope of the curve represents a 120 °C ... new

TABLE 1 Thermocouple Amplifier Operating Characteristics POLYOHM Current Gain 1240 Voltage Gain 1045 Power Gain 1.30 x 106 Input Control Power 22.2 x 10-6 watts 1% RESISTOR Input Impedance 3660 ohms Output Power 28.8 x 10-3 watts Load Resistance 3203 ohms -takes full power at Zero Drift (Referred to Input) 2.6 x 10 -12 watts am lent temperature three Linearity 1.67% Accuracy 0.70% times that specified by DERATING CURVE FOR HIGH AMBIENT TEMPERATURES Response Time (Step Input) 0.10 secs. R- Open -Loop Voltage Gain 71,000 MIL- 10509A Open -Loop Power Gain 8.7 x 10' Vi -exceeds all other change in the output current of MIL- R- 10509A specifications 0.328 ma. MIL R- 10509A, POLYOHM for a change of 1 mv. of REQUIREMENT PERFORMANCE the signal voltage. A maximum variation of -1.75% of the nominal value was observed for the varying ° 60 I0 10) I, ID ISO IS AO 220 NO AMSIENT TEMPERA URE IN DEGREES CENTIGRADE POLYOHMS are well suited to conditions specified. replace bulky, expensive and Linearity -is the amount of de- í you need a 1% resistor that highly inductive wire -wound viation of the control curve from a is stable at high ambient tem- resistors. straight line. The maximum devia- perature and humidity, we would The resistor will remain well with- tion in output current is 1.67% of like you to test free samples of in its 1% tolerance even under the the rated our newly developed POLYOHMS. stringent moisture test which current of 3.0 ma. allows a 5% change. Its temper- Zero drift a They exceed all MIL- R- 10509A -is measure of the specifications as you can see from ature coefficient is always lower lateral shift of the curve and is the comparison table below. Note, than both the R and X char- evaluated in terms of input control for example, that they take full acteristics. power. It is computed from the in- power at ambient temperatures POLYOHMS are manufactured in put voltage necessary to restore the up to 120 °C instead of only 40 °C. Lfz, 1, and 2 watt sizes with facili- Thus, they are ideal for use in ties controlled by the Signal output current to zero and the input aircraft and guided missiles. The Corps. They are presently avail- impedance. The zero drift level at same fact, of course, will result able only for government end use. room temperature for specified volt- in much longer life when they are Please request samples on com- age and frequency variations is 0.33 operated at lower temperatures. pany letterhead. x 10 -13 watts referred to the input. Total zero drift for all conditions is TABLE OF TEST RESULTS -12 2.6 x 10 watts referred to MIL- R- 10509A the TEST POLYOHM Test Results input. Allowable change (Median Value) Accuracy -describes the change Temperature cycling 1% .03% in the input voltage to maintain a Low temperature exposure 3% .08% constant output current. The ac- Short time overload .5% .03% curacy over a limited ambient tem- Load life @ 40 °C - 1000 hrs. 1% .2% perature range ( +30 °C to +70 °C) @120 °C - 1000 hrs. - .5% is 0.17% of the total input signal Temp. coeff. ppm / °C (char. X) ±500 -150 voltage. Over -all accuracy for all (char. R) ±300 -150 Moisture resistance conditions specified is 0.70%. test 5% .3% The amplifier delivers 28.8 milli - watts of output power to the load circuit. Input power from the ther- RESEARCH mocouple necessary to control the output is 22.2 x 10-° watts, and the 202 TILLARY ST. & DEVELOPMENT CO INC btidurest over -all closed -loop power gain is BROOKLYN 1, N.Y. Sales Office: Telephone 1 SO. NORTHWEST HWY., PARK RIDGE, ILL.- TAlcot 3 -3174 1.3 x 10°. The total open -loop power ) essera Sales Ulster 2-6800 Office: (Continued on page 159) 737.41, SUITE 7, NO. SEWARD ST., HOLLYWOOD 38, CAL. HO 5.5287

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product Information, use inquiry card on last page. 157 www.americanradiohistory.com suggestion ir from an Electronic Chief

... and ten little indians buy the electronic products he specifies

He's the man with authority. He heads his department and has verified responsibility to specify and buy electronic products. He's engaged in manufacturing or operation, the industry's two main buying power divisions. He's the man to reach to sell. He's an "Electronic Chief" and reads TELE -TECH & ELECTRONIC IN- DUSTRIES regularly because it is edited for, and circulated to him, exclusively.

The chart to the right shows TELE- TECH's complete coverage of chief engineers and other top engineering and executive personnel in the $8 billion electronic market. 78% of TELE- TECH's 27,072* total circulation is in the two main categories which account for 90% of the total dollar volume of purchases. This effective market penetration costs only $21.31 per thousand.

* Effective January 1955. Cannot appear in BPA statement until June audit. TELE -TECH & ELECTRONIC INDUSTRIES PREFERRED MAGAZINE OF THE "ELECTRONIC CHIEFS' 480 Lexington Avenue, New York 17, N.Y., Plaza 9 -7880 www.americanradiohistory.com Magnetic Amplifier (Continued from page 157) FOR gain is 8.78 x 107; individual power gains are 11,800 for the first stage and 7,480 for the second stage. The ACCURACY approximate time constants are 1.50 sec. and 8 millisecs, respectively, for STABILITY the first and second stages. A time LOW COST constant ratio (r) of approximately 268 produces unity damping factor when the ß K1K2 product is 66.6 (Eq. 3). The ratio for the thermocouple amplifier is 187 which produces an under- damped response; CHOOSE however, critical damping is obtained by connecting a 6.0 of condenser across the output circuit as shown in Fig. 4. The response is crit- DEPOSITED CARBON ically damped with a total response time of 0.10 secs. rikf.& RESISTORS Physical Description When you choose Electra, you get close toler- The amplifier ance, plus stability you can depend on. And you is packaged as a get them single hermetically sealed at a price that can mean important unit, and avings in your production contains the components within the costs. You also get the dvantages of low voltage coefficient, low dotted lines of Fig. 4. An epoxy resin r capaci- protects the components mechani- e and inductive characteristics and small physical cally and increases the intercompo- . Why nor get all the facts today. Check the nent insulation. The unit resists e selection of sizes available. Then, drop us te and let corrosive atmospheres and will us give you full specifications, withstand the shock and vibration , deliveries. requirements specified for most military applications. The over -all dimensions of the packaged unit are STANDARD DEPOSITED CARBON RESISTORS Electra MU. Spec. Rated Resistance 31/2 x 4 x 4 in. Max. Standard Coat Leads and the weight is Part No. Number Wattage Voltage Range Length A Dia. B Dia. 3 lbs. 4 Ohms DC1 /8 none .125 Connections are made to a termi- 250 250K 9/32" 5/64" .016" 5 Ohms nal header located at the bottom of DC1 /4 RN10 .25 300 1 Meg 17/32" 3/32" .026" the unit. The header also contains 6 Ohms test terminals DC1 /2 none .5 500 5 Megs 13/16" 11/64" .032" that facilitate balanc- 3 Ohms ing and calibrating the amplifier. DC1 /2A RN20 .5 350 2.2 Megs 19/32" 11/64" .032" Four mounting studs 3 Ohms permit the DC1 /2B none .5 500 5 Megs 11/16" 15/64" .032" unit to be flush mounted to a chassis 2 Ohms or panel. DC1 /2C RN15 .5 350 2 Megs 15/32" 11/64" .032" 3 Ohms DC1 RN25 1.0 500 10 Megs 15/16" 9/32" .032" 10 Ohms Additional Applications DC2 RN30 2.0 1000 50 Megs 2 1 /16" 9/32" .032" Special coatings, The amplifier was developed for sleeves lead lengths, etc.. available. Standard lead lengths (C) 11/7 ". a These resistors meet thermocouple application that uses or sxceed specification MIL- R- 10509A. an Iron -Constantan thermocouple. HERMETICALLY- SEALED DEPOSITED CARBON RESISTORS The amplifier provides temperature maximum indication and alarm signals over a Rated Resistance Leads Part No. Wattage Voltage Range Length A Dìa. B Pia. temperature range of 330° C for this 4 Ohms thermocouple, but other types of HC 1 1/4 250 250K 15/32" 5/32" .016" 5 Ohms thermocouples 1h may also be used. If HC 2 300 1 Meg 3/16" .026" a platinum -rhodium thermocouple 3 Ohms (Continued on page 160) HC 3 5/z 350 2.2 Megs 11 /16" 1/4" .032" 3 Ohms HC 4 1 500 5 Megs Tarr 5/16" .032" 6 Ohms Sylvania Installs HC 5 1 500 5 Megs 1" 9/32" .032" "Shadowless- 3 Ohms Lighting" HC 6 2 500 10 Megs 1>/e" 7/e" .032" Special "shadowless- 10 Ohms lighting" fix- HC 7 3 1000 50 Megs 21/4" 3,18n .032" tures and techniques designed to All re- lead lengths (C) . Both standard and hermetically sealed resistors normally supplied duce plant production costs at the in tolerance of 1 %. To'erances Of 2 %, 5% and 10% also available. assembly line have been developed and installed at Sylvania's new Electra also manufactures giant -sized TV manufacturing plant plastic encapsulated resistors. Full details gladly furnished on request. Address: recently completed at Batavia, N. Y. ffed it was announced by T. G. Hearn of carbon -coat ELECTRA MANUFACTURING COMPANY Sylvania Electric Products Inc. Pa1c!SION P11151005 4051 Broadway Kansas City. Missouri Phone WEstport 6864

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 159 www.americanradiohistory.com Magnetic Amplifier (Continued from page 159)

is used, the amplifier provides temperature indication and control over a temperature range of 1700 °C. In addition to thermocouple applications, the amplifier is well suited for many other low -level applications. In the field of spectrophotome- try the amplifier may be used to maintain the output of a light source VARGLAS SILICONE at a constant intensity. An intensity of 0.8 ft. -candle will control the am- CLASS H plifier's output over its full range TUBING and SLEEVING when a selenium type barrier -layer cell is used in the input circuit. The for applications requiring prolonged heat intensity of a light source can be endurance at temperatures up to 260 °C. regulated to within 0.7% of this range or 0.006 ft.- candle. The amplifier is particularly well suited for Varglas Silicone tubing and sleeving were static strain measurements; how- developed by Varflex for applications in- ever, the inherent time lag places a volving continuous operating temperatures up to 260 °C. Exceptional stability is com- limitation on the frequency response bined with the following qualities . . . for dynamic strain measurements. The amplifier can also be used in FLEXIBILITY... sharp turns and 90° bends servo systems where the time con- cause no cracking or peeling - no loss of dielectric strength. stant is not objectionable. In general, the amplifier may be applied to DIELECTRICALLY- STRONG -All grades conform to any low-level application where a NEMA and MIL -I -3190 standards. high degree of stability, sensitivity, MOISTURE -RESISTANT -including resistance to and accuracy with a relatively fast salt water, mild alkalis and acids. response is required. the 10th National FLAME -RESISTANT Standard is 45 (This paper was presented at - burning test Electronics Conference, 1954.) seconds to burn 1 inch. Can be made self- extinguishing on special order. Refer COLD- RESISTANT -Excellent resistance to chafing 1. F. C. Williams and S. W. Noble, "The Fun- and abrasion, flexible to -35 °C.* damental Limitations of the Second -Harmonic Type of Magnetic Modulator as Applied to the Amplification of Small D.C. Signals,' Proc. Inst. to °C, and for Elec. Engrs., Vol. 97, Part II, No. 58, pp. *For temperatures down -65 445 -459; 1950. applications requiring extraordinary flexi- 2. L. W. Buechler, "Low Input -Power Level Mag- bility, we recommend our new Verglas netic Amplifier'!, Proc. N.E.C., Vol. 7, pp. 254- sleeving and tubing. In- 259; 1951. Silicone Rubber 3. H. Chestnut and R. W. Mayer, "Servomech- quiries invited. anisms and Regulating System Design," Vol. 1, 3rd printing, John Wiley & Sons, Inc., New York, New York, p. 207; 1952. 4. R. W. Roberts, "Magnetic Characteristics Per- tinent to the Operation of Cores in Self-Saturat- ing Magnetic Amplifiers" Conference paper Send presented at the Winter General Meeting of the AIEE, New York, New York; 1954. for ""Ter- FREE SAMPLES Single Head Automatic Mail coupon today for free folder containing 25 different test samples of Varflex insulating sleeving, Assembly Machine tubing, lead wire and tying cord. The Minnesota Engineering Com- pany, Minneapolis, Minn., has dis- CORPORATION closed the development of a single head, multi- purpose, automatic as- Makers of Dec-tricot i ' Insulating Tubing ; VARFLEX SALES CO., INC., 315 N. Jay St., Rome, N.Y. sembly machine for electronic pro- and Slaeving ; (For Silicone Products Only) duction. It is marketed under the trade name, "Minn-A-Matic." Please send me free folder containing samples of your electrical insulating tubing and sleeving. The base for this type of assembly I am particularly interested in insulation for is the printed wire board. Boards I ranging in size from 1" by 1" to 12" Name by 17 ", and up to W' in thickness Company may be accommodated. Boards are Street 0 run vertically rather than horizon- m City_ Zone State . tally through the machine. Boards mmmm ill may be inserted in two ways. 160 For product information, use inquiry card on last page. TELE -TECH 8, ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Transceiver (Continued from page 95) The simplified mechanical arrangement shown in Fig. 2 permits the entire transmitter -receiver to be inserted or removed from its aircraft Solar ceramic mounting base for service or normal maintenance in approximately 10 to feed -thru capacitor 15 secs. It is only necessary to un- snap the two fasteners. It is not necessary to disconnect any electrical plugs. All electrical connections including the antenna are made through the two printed circuit connectors shown in Fig. 2 at the left. The unit is designed to operate without a shockmount. However, SAVES SPACE and longer life from the tubes may be expected if a vibration isolator is employed. CUTS ASSEMBLY Particular attention was paid to the problem of removing the heat from the 5702 WA subminiature TIME tubes. These tubes are mounted with special right angle subminiature DVLXK printed circuit tube sockets, permit- "STEP-OAP" ting the tubes to lay close to the copper etched circuit card. Aside from the obvious advantage of reducing the thickness of the package, this allowed the use of special heat radiating That shoulder you see in the capacitor body and conducting tube does away with eyelets. With no eyelets to take up shields. These can be seen in Fig. 3. space, these units can be mounted much closer The etched card serves the function together, leaving more room available on the chassis. of a heat sink. fast mounting. These capacitors won't tilt when mounted because they're self -centering. And the Electrical Characteristics shoulder holds each unit at the proper distance above ground, so that jigging is unnecessary. The receiver is shown in Figs. 2 Just drop the Step -Cap into the chassis, and and 3. Basically the receiver is a it's ready for the solder oven. single channel crystal controlled quick soldering. Silver is bonded homogeneously superheterodyne operating at a fre- to the ceramic to facilitate soldering directly into the quency of 121.5 mc. A type 5702 WA chassis. And in lead -thru wiring, the cupped ends (VT1) is provided as a radio fre- speed soldering by serving as solder retainers, thus keeping solder from bridging the insulating gaps. ## available immediately in unlimited quantities WIDELYt SEPARATED -and priced low. FLANGED CAPACITORS They are available in capacity ranges from 3 to 275 mmf @ ±10% and ±20% tolerances; from 276 to 1000 mmf @ GMV. Units are rated at 1000 VDCW. Mounting hole :.192 ". Can be furnished without center lead as a lead -thru type. Write for complete details on the Solar Step -Cap.

Fig. 6: Complete assembly of transmitter, receiver and power supply in metal housing STEP.CAPS MOUNT CLOSE TOGETHER quency amplifier. The impedance of "QUALITY ALWAYS" the tuned circuit connecting to this amplifier is 50 ohms. The crystal controlled local oscillator is also a type SOLAR MANUFACTURING CORP. 5702 WA (VT2). The control grid New York, N. Y. 0r and screen grid are used to provide a 3rd overtone oscillator operating at 33.05 Mc. The frequency accuracy SALES O F F I C E S : of the CR51 crystal employed is 46th & Seville, Los Angeles 58, Calif. ß-.01a%. This establishes the calibra- 4000 W. North Ave., Chicago 39, Ill. (Continued on page 162) CERAMIC CAPACITORS PRINTED NETWORKS PIEZO CERAMICS

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use Inquiry card on last page. 161 www.americanradiohistory.com Transceiver USE VICTOREEN (Continued from page 160) tion accuracy of the receiver. This frequency is doubled to 66.10 HI -MEG RESISTORS Mc in the plate circuit of this tube. Second harmonic injection is intro- WHERE ACCURACY AND STABILITY duced into the control grid of the 5702 WA (VT2) mixer tube. High ARE ESSENTIAL side injection is used resulting in an image frequency of 142.90 MC. This frequency is very seldom occupied and is used only by relatively low powered transmitters. If low side injection had been used, the image frequency would be 100.10 MC. This is near the center of the FM broad- Unit illustrated actual size. cast band. The RF image rejection Capacity 18,600 Megohms, ratio of the receiver is better than 55 db. The RF circuits can be tuned to any frequency between 118 and Victoreen Hi - Meg resistors are 130 Mc. not intended to replace conven- The output of the mixer VT2 feeds tional type resistors used in ordi- the 10.7 Mc intermediate frequency nary applications. But, if your amplifier. This amplifier has 3 stages resistor application, requires accu- of amplification employing type 5702 racy and stability beyond the resis- WA tubes. These are VT4, VT5, and tance limits of other type resistors VT6. Four double tuned IF trans- then test Victoreen Hi -Meg resistors. formers are used to provide inter - Carbon coated glass base with silver stage coupling. Stage gains are ap- banded contact ends, vacuum sealed in proximately 30 db. a glass envelope, which is specially To obtain an efficient IF trans- treated with silicone varnish to assure former in a relatively small package, a moisture -proof, impervious seal. the design shown in Fig. 5 was de- Power rating for any Hi -Meg resistor is equal to one divided by the resistance in Megohms. Voltage limit 1000 volts. Write for bulletin 3025. AVERAGE VOLTAGE COEFFICIENT OF HI -MEG RESISTORS VERSUS RESISTANCE o I JI 111M11111111111111M111111111 .02 111111111i:!I11111111 > .04 11011111111111 VOLTAGE COEFFICIENT 111111111111 AT 100 VOLTS ¡ I 1 I --.06 RESISTANCE Fig. 7: Transmitter and power supply sections 1 RESISTANCE AT I VOLT / 1 I-- 100 ' 111\\11111 Lu 08 1111111111 veloped. Toroids were used to obtain u 0111111111111 LL 11111111=1111I11MI111M a "Q" of 140 in a very small metal w .10 1111111111111111111111111=11111 housing. The actual Q of the IF as- Ú 111ME11111111111M1111111111M1111111 sembly was reduced with resistive w .12 11M11N11EIMINIlMIII\\iI loading to provide greater stability. CD 111=11111=11I1111111111111111111111M11 Without the resistive loading, the IF ,t] .14 II111IIII11111\1II amplifier had a bandpass character- 6 110 xc °> 11111111111=II111111\\11 istic of 20 xc at db and at .16 11111111111111111\`II 60 db. The sum of all the maximum 111111I11111f11111111111111101 frequency errors that could exist in .18 1IIMIN1IIM1II11111II1111M11I1=111=III3 the overall system (ground trans- 11IM1111I11111I11111MIIMII1IIMI1IIIIIMI mitter and airborne receiver) dic- .20 11111111M11 tated widening the pass band. 1 The selectivity provided by the 108 09 010 101 1012 1013 1014 final design is 55 xc at 6 db and 250 RESISTANCE (ohms) xc at 60 db, giving a shape factor of COMPONENTS DIVISION 4.54. AVC voltage is obtained from a type 1N217 silicon diode, CR4. An AVC delay voltage of approximately 9 v. is used to provide a relatively flat AVC characteristic. AVC con- P E R K I N S AVE. CLEVELAND 14, OHIO 13814 trol voltage is applied to the RF am-

162 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com plifier VT1 and to the first two IF amplifiers VT4 and VT5. The AVC characteristic shows only a 3 db rise in audio output when the input voltage at the antenna is varied from 571419-ACTION 10 to 100,000 microvolts. The second detector is a type SWITCHES 1N217 silicon diode, CRI. To minimize interference from electrical ... for devices such as electric motors, ignition noise, etc. two type 1N217 real space economy silicon diodes, CR2 and CR3, are employed in a very effective series/ Small size, light weight, and added shunt automatic noise limiter cir- dependability cuit. The audio output from the ANL go hand -in -hand in all is amplified by a 5702 WA (VT7). Hetherington switches. For the lightning - Note that only one type of vacuum fast Hetherington snap -action mechanism tube has been used in the entire permits higher ratings in less space ... receiver up to this point. without deceptive "clicks" Two of the 5686 tubes, VT103 and or "snaps" ... VT104, shown on the transmitter and with no danger of teasing the card in Fig. 1, serve the dual func- switch ON or OFF contact. tion of modulator tubes for the Shown below are just a few of the transmitter and audio power output tubes for the receiver. During the many Hetherington snap- action switch receive cycle these tubes are oper- designs in the 5 to 50 ampere range. ated at 125 volts plate voltage. The plate of the audio amplifier VT7 is MINIATURE TOGGLE SWITCH type T2104 transformer coupled to the grids of Only 11%4" long by 1: S_" in diameter, this new power amplifier tubes, VT103 and I(etherington design takes considerably less space VT104, through the dual purpose than comparable rectangular switches. The T2104 transformer, T102. This transformer uses a positive cam -roller snap -action that `feels" also couples the microphone to the and performs like a toggle switch should. 4- termi- modulator nal arrangement "makes" contact between separate tubes during the transmit pairs of terminals in each position -can be con- duty cycle. nected for SPDT action. Conservatively rated for The maximum audio 50,000 cycles at resistive loads of 10 amps, 28 volts power output Approx.1 5 de; 5 115 volts from the receiver is 1.0 w. at an im- Actual Size amps, ac. pedance of 600 ohms. The audio frequency response of the receiver is HOLDING COIL SWITCH -3 db at 400 and 3500 cps. The over- ...the answer to many control problems all sensitivity of the receiver is such This "control engineers delight" combines relay, that a 1 pf input signal at the an- switch, and pilot light functions in a single unit tenna terminal will provide 50 milli - only 15/a" in diameter by PH" long. A built -in watts of audio output at a signal - solenoid holds the switch on contact until solenoid to -noise circuit is externally interrupted. SP -ST switch cir- ratio of approximately 12 cuit may also be broken manually by pulling the db. switch knob. Knobs may have built -in lights to indicate when the holding circuit is energized. Transmitter The transmitter uses four identical "JR" SERIES Push -Button- Momentary Contact tubes. The 5686 oscillator, VT102, Over 600 Types uses a CR51 crystal in a third over- These unusually rugged and dependable snap - action switches have become a tone circuit oscillating 30.375 Mc. almost "standard" at for critical aviation and industrial applications. Frequency tolerance is ±0.005%. Six circuit arrangements and over 20 mounting The plate circuit of this tube is tuned adapters match virtually any requirement. Rated to twice the oscillator frequency and for inductive loads of 17 amps, 24v dc; 15 amps, drives the grid of the 5686, VT101. 115v ac; or 7.5 amps, 230v ac. U.L. Approved for ac. Similar switches for MIL -6743 (MS- 25089) This tube operates as a Class "C" applications available as Type WI00. frequency doubler and power amplifier. The plate circuit is tuned to 121.5 Mc. This power amplifier has an output of approximately 2 w. at an impedance of 50 ohms. The RF fIETf/ER//Y6T0/V circuits can be tuned to any single channel in the frequency spectrum SHARON HILL, PA. between 118 and 130 Mc. AVIATION & INDUSTRIAL TYPE SNAP -ACTION SWITCHES The RF power amplifier VT101 is INDICATOR LIGHTS high level plate and screen ampli- SWITCH -LIGHT COMBINATIONS tude modulated with the two 5686 SWITCHGEAR ASSEMBLIES RELAYS COILS tubes, VT103 and VT104. These are the same tubes which are used as West Coast Division, 8568 W. Washington Blvd., Culver City, Calif. (Continued on page 164)

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 163 www.americanradiohistory.com Transceiver (Continued front page 163)

You can depend on the audio power amplifier for the receiver. The audio frequency response of the transmitter is -3 db OLOHA1 at 350 cps and 3500 cps with 1000 CPS used as a reference. A carbon microphone input is provided. Fig. 7 illustrates the transmitter mounted on its base. The complete TYPE RS assembly is shown in Figure 6. MINIATURE POWER It is believed that the transmitter- receiver described represents a prac- RESISTORS tical present day approach to the For all applications where the equipment must survive problem of providing reliable emer- the most severe environmental, shock, and vibration gency or stand -by communications conditions. in the VHF region for military and Completely welded from terminal to terminal. Silicone commercial aircraft. The components sealed, offering high dielectric strength, maximum heat selected are available for immediate dissipation, and maximum resistance to abrasion Im- in production quanti- pervious to moisture, salt ions, vapor and gases. procurement ties. It provides better reliability Three wattage ranges: RS -2, 2 watts; than larger multi -channel equip- RS -5, 5 watts; RS -10, 10 watts. ments inasmuch as it is not affected Temperature coefficient 0.00002 /Deg. C by failure of ac power sources. It Ranges from 0.1 ohm to 55,000 ohms depending on type was designed to be produced for a Tolerances 0.05 %, 01 %, 0.25 %, 0.5 %, 1 %, 3 %, 5% need that exists today. Conform to Applicable JAN and MIL Specifications

WRITE FOR BULLETIN No. R -23

Export Dept.- Pan -Mar Corp., DALE PRODUCTS, Inc. 1270 Broadway, New York 1, N.Y. 1304 28th AVE., PHONE 2139 COLUMBUS, NEBRASKA Portable Light Control For Movie Studios Lighting and light effects are to If your television what tones and sound ef- problem involves accurate fects are to radio. The viewing public division of AC voltage, you need a not only insists on seeing a good i picture but also on enjoying properly lighted action and background to really feel the presentation. It is STANDARD RATIO TRANSFORMER not enough just to see some black and white moving objects on the AC voltages can be divided with screen. accuracies as good as .005% and "Some installations of light con- resolution as good as .00001% trol for television studios have run up into the six figure area to offer effective lighting for studio presen- The PT Series (7 models) precision AC says Dan Murphy, Presi- voltage dividers have been specifically de- tations," signed to divide AC voltage H'ith unusual dent of the Otto K. Oleson Electric accuracy. Push button and rotary switch Co., of Los Angeles, "but we recently models available, in both carrying case completed a studio installation that and rack mounting styles. Models avail- gives excellent light control in the able to cover frequencies from 30 to 3,000 cps (to 10,000 cps at reduced accuracy). low cost brackets." PT -5, illustrated, covers 50 -3,000 cps, with The installation was in the Holly- continuous resolution. wood studios of The American Broadcasting Company where three light control units For design and production use portable Luxtrol give a great degree of flexibility. The Applications include: Bridge Ratio Arm, cost of $3,500 per unit is a fraction AC potentiometer; checking resolvers, ser- of amount spent in many less vos, transformers, computers; for meter the calibration, and as a ratio standard. elaborate stations. Each of the three Luxtrol package units is a dimmer board containing eight 6,000 watt For complete information contact load pockets your Gertsch representative or dimmers and sixteen with alternate switching of either of GERTSCH PRODUCTS, INC. the load pockets. 11846 Mississippi Avenue Moreover, each unit can be rolled GERTSCH Los Angeles 25, California on casters to any stage in the studio See us in Booths 1014 & 1015, WESCON. where show is to be produced.

164 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Transistor Amplifier (Continued from page 132) If the preceding simplified voltage gain and input impedance expressions are to be valid and the design factors are to be useful, then care must be taken to bias the transistors at the desired operating point and to prevent the biases from varying with SELENIUM temperature. If the transistors are not biased at the intended point and if the biases change with tempera- POWER RECTIFIERS ture, it may become impossible to satisfy the assumptions that lead to the simple predictable equations. Moreover, if the biasing is not pre- feature "Solid Stack" assembly dictable and stable, the operation of large signal stages will be in doubt (clipping levels and distortion) and the power supply requirements will be unknown and variable.' A representative sampling of biasing circuits are shown in Fig. 3. The self- biasing circuit (a) sets its own bias along the loci of points where emitter and collector currents are equal. The circuit offers neither predictability nor stability (with temperature). The base -injection circuit (b) is too dependent upon (1 -a) and, while better than the self -biasing circuit, it is still essentially unpredictable and unstable. The balance of the circuits can achieve any desired degree of bias perfection. SIZES AND RATINGS The If it is assumed a is - that near unity standard line of UNION selenium and that the base-emitter voltage An outstanding feature of the new rectifier cells ranges in physical size is drop negligible then the biases for line of UNION Selenium Power Rec- from 1" square to 5" x 6 ". With con- the last four circuits are determined tifiers, as shown in this cutaway vection cooling they are rated from as follows: view, is the "solid stack" assembly. .180 to 10.0 amperes per cell on a All parts are under constant pres- single phase fullwave bridge basis. EEE sure exerted by Belleville springs at A plurality of cells can be "stacked" (e) Is = for REE (1- a) RHH, the ends of the stack. Spacer washers in series, parallel or series- parallel - » are larger than those commonly used REE combinations to fit practically any and are finished flat to close toler- current and voltage conversion re- and Ve = Ecc IE. - R ances to assure high pressure con- quirement. The stack assemblies EEE tact. This feature provides utmost conform to NEMA specifications. rigidity and far more resistance to (d) I E = for REE (1 - a) R.., The result of more than 30 - » vibration. It eliminates radial move- years R. experience, UNION ment and prevents breaks in the Rectifiers will give years lasting and V..= Ecc - Rcc Ir. paint seal. of service in many applications. Write or call any of The selenium cells are made by a (e) A bleeder current, large com- our distributors listed below for special, carefully -controlled process complete information. pared with the base current which assures uniform high quality sets a voltage level at the base. and better performance. Corners are This voltage level divided by rounded instead of sharp for safety VISIT BOOTHS 262 -263 at the REE determines IE. V, is E and to assure an unbroken protec- WESCON SHOW less the L. drop. tive coating. Connectors are made of August 24 -26, San Francisco, Calif. (d) A bleeder current, large com- brass or bronze for long service life. pared with the base current sets a voltage level at the base. GENERAL APPARATUS SALES This voltage level divided by REE determines IE. V. is E less the R drop caused by IE UNION SWITCH & SIGNAL plus the bleeder current. DIVISION OF WESTINGHOUSE AIR BRAKE COMPANY The assumptions and approxima- tions involved in the biasing tech- PITTSBURGH 18 PENNSYLVANIA niques for the last four circuits are Es of but secondary consequence in strongly biased circuits. If weaker NEW YORK, IVanhoe 3 -2424 (Hempstead) BALTIMORE, VAlley 5 -3431 ST. LOUIS, JEfferson 5 -7300 CHICAGO, LOngbeoch 1 -3042 biasing is employed, nominal allow- LONDON, OHIO, LOndon 1555 LOS ANGELES, Clinton 6 -2255

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last pagr. 165 www.americanradiohistory.com Transistor Amplifier SINCE 1915 LEADERS IN AUTOMATIC CONTROL (Continued from page 165)

ances can be made for the RBB drops and the emitter -base drops. For example, if the RBB drop is assumed as Smoothing Signal Noise (1 -a) IERBB and if the RBB and input diode drops are subtracted from EEE in circuit (c), excellent predictabil- with the DBR* Integrator ity results. The input diode drops are reasonably uniform from one and are relatively Confronted with well -known problem of random fluctuations sample to another the f called "noise," Ford engineers have employed the earliest and best - known Ford component - the disk integrator. Used in Ford ana- R ec logue computers, the disk integrator smoothes random fluctuations due to extraneous influences and obtains an average of the received signal. Thus, a device originally designed by Ford for integration is + successfully used as a mechanical counterpart of the RC Filter. Vc v e + _ IE

BB E "CC

SMOOTHED OUTPUT

Fig. 4: Circuit of Transformer Coupling INTEGRATOR invariant over a wide range of op- INPUT SIGNAL erating points. In germanium transistors the diode drops can normally CHANGE be neglected. In silicon units, the GEARS '3TIME drops may be of some consequence, but in either case, the consistency of the drops and familiarity with the type allows for simple de- The Ford circuit operates ol1 the premise that the older the data transistor sign since the effects are but second- the less important it is. Therefore, data smoothed must be weighted ary. Similar considerations apply to in proportion to its age, so that the weight assigned to it decreases the circuits of (d), (e), and (f). The exponentially with time. The output of the circuit then represents dc voltage feedback circuit (f) offers the summation of this weighted data and tends to ignore random a slight advantage over the preced- noises of short time duration. ing three circuits in temperature sta- does not appear to be As in drawing, incoming (with bility but shown the the signal noise super- worth the additional complexity of imposed) is the input to the differential. As long as the integrator design.8 If two voltage supplies are output (the roller) rotates at the same rate as the incoming signal, permissible, the emitter -injection the differential output (error signal) is stationary and the integrator circuit (c) offers good economy of carriage remains stationary. But any change in the incoming signal parts and power consumption along produces changes in the error signal which tends to displace the with high predictability, high stabil- integrator carriage and thus restore the system to equilibrium. ity, and simple design.8 This circuit represents transformer -coupling as This reaction, however, is not instantaneous. It occurs after a well as a RC- coupling. RBB would certain time -lag which may be adjusted by the gear ratio. If the be the dc resistance of the secondary signal is of brief, random nature, the time -lag of the integrator will winding of the input transformer and prevent its acting on the system. On the other hand, a permanent Ran would be the primary of the out- change in the signal will displace the carriage and change the output put. The base -bleeder circuit (e) of the system. appears about optimum for a single - supply system, the addition of one This use of the Ford disk integrator as a noise smoother exemplifies resistor and the bleeder power loss the flexibility and adaptability of Ford components and ideas. being the price paid for single -sup- of RC 'Disk, Balls and Roller Integrator ply operation. In all the -coupled cases shown, RBB plays the additional role of an input impedance shunt, Re. Also Ro, creates part of FORD INSTRUMENT COMPANY the ac load resistance and may con- DIVISION OF SPERRY RAND CORPORATION tribute to R. for a following stage. of 31 -10 Thomson Avenue, Long Island City 1, N. Y. So that the temperature stability the biases may be evaluated for a particular circuit and so that one cir- ENGINEERS cuit may be compared with another, of factors are re- of unusual obilities can find a future at FORD INSTRUMENT COMPANY. Write for information. some type stability quired. R. F. Shealw 11 has intro-

August 1955 166 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES www.americanradiohistory.com duced a stability factor, AMONG IMPORTANT

a Ia ACTIVITIES AT HUGHES S = , IS A PROGRAM a lea INVOLVING COMPREHENSIVE obtained by network analysis after assuming that "a" is constant and TESTING AND E VALUATION that the emitter -base voltage drop IN CONNECTION WITH is negligible. For the purpose at hand, the spirit of Shea's attack will HUGHES- DEVELOPED be preserved, but the details will be RADAR FIRE CONTROL modified and the technique will be expanded. AND NAVIGATION SYSTEMS A reasonably general bias circuit is FOR LATEST TYPE shown in Fig. 4. The various resistances shown are abbreviations for MILITARY ALL -WEATHER actual, more detailed circuits (see INTER CEPTORS. Fig. 3). They are defined as follows: RBB = the net equivalent dc resistance from the base to all fixed potential points. REE - the net equivalent dc resistance from the emitter to all fixed potential points. Roo = the net equivalent do resistance from the collector to all fixed potential points. RB0 - the net equivalent dc resistance from the base to the collector. Using the circuit of Fig. 4, and assuming that "a" and "Vu" are constant and that I. = L. + a IE, one can solve for the three transistor currents and for the collector voltage. Having obtained the current and voltage expressions, they can be dif- ferentiated with respect to Ina, thus Convair F-102 obtaining a set of stability factors .9 all -weather interceptor. Since the biasing method adopted previously involved the emitter current and the collector voltage, their stability factors will be considered.

a I. 1 SR = _ -,and (10) There is need on our Staff for qualified a lea D engineers who thoroughly understand this field of operation, and who have a Ve Ree REE REE sufficient analytical and theoretical Sv = -= 1+ +- ), (ll) System ability to define needed tests; outline a Iea D Rec Res test specifications; assess data derived from such tests, and present an evalu- REE Rae ation of performance in report form. where D = (1 a) + 1+- - Test Engineers who qualify in this area should Rss RBC Impel a bask interest in the system concept REE + Roo and over -all operation of test procedures; 2 experience in maintenance, + , operation, RBC "debugging," development, and evalua- Engineers tion testing of electronic systems, and SI; = emitter current stability factor, knowledge of laboratory and flight test and procedures and equipment; 3 under- Sv = collector voltage stability factor. standing of basic circuit applications at all frequencies; 4 initiative to secure sup- That the stability factors obtained porting it formation from obscure sources. from the abbreviated circuit of Fig. 4 are valid for the more detailed circuits of Fig. 3 can be readily appre- SCIENTIFIC AND ENGINEERING STAFF ciated via the "principle of superpo- sition" where Ion is considered as a current source within the transistor RESEARCH AND and all the external voltage sources DEVELOPMENT LABORATORIES are suppressed for obtaining the sta- Hughes bility factors. Culver City, Los Angeles County, California Knowledge of the stability factors

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 167 www.americanradiohistory.com Transistor Amplifier (Continued from page 167) allows for an evaluation of the external biasing circuits, but they are insufficient for the determination of the temperature stability of the bi- 24 ases in a given case. One problem MINIMUM arises due to the fact that the near 48 SPACE exponential dependence of Iea upon »o temperature is not the same for all transistors, e.g., in one unit, Iea will VOLT DC double every 10° C, while in another it may double every 15° C. Knowl- ROTARY edge of the logarithmic slope of I,0 vs. temperature thus should be given SWITCH RVF some consideration by the designer, but its effects will not be formalized here. Another consideration, however, of obvious importance is how 30 Points large is Ica at, say room temperature 6 Levels with respect to the operating level. Single To appreciate the bias stability of a Wiper given circuit, one must know not or only the rate at which a bias changes with Ieo, but how important is Ica in 15 Points the first place. Thus level factors and 12 Levels stability products will be introduced Twin to allow for a more complete quan- Wipers titative evaluation of bias stability with temperature.9 I. 4 "find" for Systems Designers Lt = -X 100 % current level factor, IE and craftsmanship with the most advanced prin- Combining outstanding quality lro design and construction, the R V F Rotary Switch features greater re- ciples of L = -X100 %a = voltage level factor, liability, smoothness of operation, precision, speed, longer life, compactness Vo and light weight as standard specifications. SP1 = SE LI current stability 1. Built -in silicon carbide spark suppression on 24 and 48 volt standard switches. product, and switch is shock mounted with full spring suspension for 2. Each SPV = Sv Lt = voltage stability shock and vibration isolation. product. 3. Bank and drive mechanism completely dust -proof -in trans- parent cover -permits easy inspection. It should be noted that the stabil- 4. Rotor index visible from top or bottom. ity factors and products are ideally 5. 10,000,000 revolutions with no adjustment. zero. As they approach the ideal, 6. Bifurcated wiper contacts. however, power supply requirements 7. And more... smuen.o came become greater and small signal gain may be impaired. Only experience can establish the practical levels of Shorting type wiper contacts .. factors non -bridging ... connecting two the various introduced. individual adjacent contacts. Inter- rupting springs of special contact REFERENCES alloy ... needs no field adjustment. r'e--3°. Spring driven switch rotates in one 4h- 1. R. F. Shea (ed.), "Principles of Transistor Circuits," John Wiley & Sons, Inc., N. Y., direction . . . eliminates fly -back 1953, 40 -49. overtravel is impos- pp. spring. Switch 2. R. F. Shea (ed.), op. cit., p. 44. sible ... positive stopping at any 3. R. F. Shea (ed.), op. cit., p. 97. selected point. 4. R. F. Shea (ed.), op. cit., p. 9. 5. F. R. Stansel "Transistor Equations," Elec- USAGE: Automatic controls .. . tronics, pp. 156, 158, March 1953. Scanning ... Coding ... Register 6. Bulletin No. DL -S 405 -March 1954, Tenta- tive Specifications, -Type 201, Texas In- Storage ... Programming ... Se- struments, Inc., Dallas, Texas. quence Operation ... Pulsing ... 7. Small Signal Silicon Grown -Junction Tran- Tele- metering ... Computors. sistors, Preliminary Specifications, Aug. 20, 1954, Texas Instruments, Inc., Dallas, Texas. 8. R. B. Hurley, Temperature Study of Tran- sistor Amplifiers -Fifth Report, (An unpublished report), TM- 333 -468, May 10, 1954, Convair, l'ornons, Calif. Detailed specifications available on request. 9. R. B. Hurley, Temperature Stabilization of Transistor Amplifiers, (An unpublished paper), Convair, Pomona, December 30, 1953. (En- closure to TM- 221 -447, Jan. 4, 1954.) THE NORTH ELECTRIC 10. R. F. Shea, "Transistor Operation of Operat- ing Points," Proc. I.R.E., Vol. 40, No. 11, MANUFACTURING COMPANY pp. 1435 -7, No. 1952. 11 R. F. Shea (ed.), op. cit., pp. 97 -131. B Stabilized Tran- of ALL RELAY Systems of Automatic Switching 12. R. Hurley, "A Temperature Originators sistor Amplifier," Trans I.R.E., PGCP -2, 588 South Market Street, Galion. Ohio, U S.A. 93 -103, Sept. 1954.

168 For product information, use inquiry card on last page. TELE -TECH 6. ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Ferrite Heads MORE STAYING POWER FOR YOU R (Continued from page 83) TEST SET DOLLAR response curves for head #15 taken at 100 and 160 ips tape speeds. It will be noted that the improvements in frequency response due to the in- Buy right today and know you're ready for crease in speed is not as great as ore would expect. There was evi- tomorrow's requirements. Hycon test instru- aence that an air film between the LABORATORY ments defeat obsolescence by anticipating - future quality. head and tape was produced at 160 and surpassing - standards of ips. A spacing loss of .02 mils will ACCU RACY In addition to the three basic instruments account for the decreased resolution. shown, the Hycon line will soon include a 5" SERVICE sweep and color bar These ferrite heads have a reso- FIELD- oscilloscope, generator, /dot lution which is at least as good as RUGGEDNESS generator. Write the factory or contact your local any of the metallic heads which have parts jobber for additional product information. been made available for comparison at this time. A discernible output was noted at .125 mil wavelength. In terms of the equalization required, these heads would be useful to at least .2 mil recorded wave- Convenience at unprecedented low cost sums up length. The relatively low output this rugged, serviceable instrument. Hycon plus would put a severe requirement on features include: 21 ranges (28 with peak-to- associated the amplifiers. peak scales); large Pe meter; 3% accuracy It has been demonstrated that fer- on DC and ohms, 5% on AC; frequency response rite heads with good short wave- to 250 me with accessory crystal probe. Test length resolution can be fabricated. probes stow inside case, ready to use. However, they are not, at this stage of development, a satisfactory general purpose head at these resolutions. As a record head they have the following shortcomings: relatively low saturation flux density, low Curie temperature, and erosion of the gap edges. Playback heads Ideal for production -line testing and lab- suffer from erosion at the gap edges. oratory work, this new VTVM provides The Curie temperature for these direct readings without interpolation. Fea- particular ferrites was fairly low, tures illuminated digital scale with decimal around 65 °C. The use of these heads point and polarity sign; 12 ranges (AC, DC, as record heads in an ambient tem- ohms); frequency response to 250 me with perature of 25 °C is marginal; the auxiliary probe; accuracy: 1% on DC and rise due to combined bias and rec- ohms, 2% on AC. Cuts multiple scale confu- ord current may cause the total sion and learning curve error. temperature to exceed the Curie temperature. They would obviously not satisfy military specifications. This limitation does not appear to be Designed for both field serv- fundamental. A further material de- icing and laboratory require- velopment should raise the Curie ments. Features high deflec- temperature some, although perhaps tion sensitivity (.01 v /in rms); at the sacrifice of some of the other 4.5 me vertical bandpass; flat ± properties. 1 db; internal 5% calibrating The low saturation flux density is voltage. Small, compact -but not a serious handicap in conven- accurate enough for the most tional playback heads, or in wide exacting work. Special flat face gap record heads. In record heads 3" CRT provides undistorted which have gaps as small as those trace edge to edge. described above, saturation becomes a serious problem. Since the recording process in a gap type head depends upon leakage flux, and since 7Çcon Mfg. Company the relative amount of leakage flux DON'T FORGET 2961 East Colorado Street with a very fine gap is very small, it SEE THE COMPLETE LINE Pasadena e, California follows that the flux density in the "Where accuracy counts" core, and especially the gap edges AT THE 1955 WESCON SHOW must be high. It has been found that BOOTHS 1812 AND 1813 GO NO-GO MISSILE TEST SYSTEMS AERIAL CAMERAS BASIC ELECTRONIC RESEARCH AERIAL SURVEYS with these ferrites and gap lengths ELECTRONIC TEST INSTRUMENTS ORDNANCE saturation does occur. In Fig. 6 are ELECTRONIC SYSTEMS

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use Inquiry card on last page. 169 www.americanradiohistory.com New Products OUTSTANDING SELECTION OF SPRING -MOUNTED JEWELS RESISTORS FOR SPOT APPLICATION Now an exclusive feature incorporated in G.E.'s most popular instrument Designed to perform a long life cycle lines -types P -3, AP -9, and DP -9, in varied electronic environments. these spring- mounted jewels afford unique protection against shock and

NOBLETTE METAL FILM RESISTORS

Type NA- Vitreous enamel coating over a metallic resistance element assures long life stability- retards moisture penetration. Avail-

able in 1/2, 1 and 2 watt; in resistance range

of 1 ohm to 10 megohms. Standard tolerance

1 % , 2 and 5% on special order.

etowwwwwrtwwnwesf.y- -

NOBLELOY METAL FILM RESISTORS

rtZ=1 Type in quality construction to NR- Identical the NOBLETTE. It has radial leads to make pivot wear. The use of spring mount- possible wide range application. Available ings, with pivot retaining collars, pre- in 1/2, 1, 2 and 5 watt; in resistance range vents the blunting, or "mushrooming" of 1 ohm to 15 megohms. Standard tolerance of the instru- ± 1%, 2 and 5 on special order. of pivots due to jarring ments, which are used for various types of voltage and current measurements. This affords protection against the need for expensive repair caused by the blunting of pivots. G. E. Co., Schenec- tady. N.Y. -TELE -TECH & ELEC- TRONIC INDUSTRIES (Ask for 8 -55)

FILM PROCESSOR CARBON FILM RESISTORS Designed for easy operation and quality processing of 16mm. negative or positive black and white film, the "Lab - master" offers all parts accessible for Type CF -A low cost carbon film precision The resistor. Pure carbon particles are deposited easy operation and maintenance. on a ceramic rod. Protective coating applied unit is completely self- contained and

over film resists moisture. Available in 1/2, 1 is daylight operating. Speed of opera- and 2 watt; in resistance range of 10 ohm tion from 10 to 35 feet /min., depending to 20 megohms. Standard tolerance 1%. on type of film, energy and temperature of solutions. Film transported by a fric-

WIRE WOUND RESISTORS

Type WM -Leads are permanently soldered to the resistance element preventing loose contacts caused by temperature stress. Avail-

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REPRESENTED IN LEADING CITIES FROM COAST TO COAST

tion clutch drive, and developer and fixer tanks have temperature control. Houston Fearless Div., Color Corp. of CONTINENTAL CARBON, INC. America, 11805 W. Olympic Blvd., Los Angeles 64, Calif. -TELE -TECH & 13900 LORAIN AVE. CLEVELAND 11, OHIO CLEARWATER 1 -6500 ELECTRONIC INDUSTRIES (Ask for 8 -39)

170 For product information, use inquiry card on lost page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Ferrite Heads (Continued from page 169) shown input- output curves for a fer- KEARFOTT rite head and a Brush BK1090 head. For comparison, the same head was used for playback in each case. It ANNOUNCES will be noted that the first break in slope occurs at 8 db. output for the Brush head but at -1 db. for the ferrite head. It is not obvious from the data that the Brush head is saturating but certainly the ferrite head is saturating well below tape saturation. This difficulty may be reduced by using materials with higher saturation flux density or by increasing the record gap length. a FERRITE ISOLATOR Ferrites as a class tend to have MODEL W152.1A low saturation flux density so that it appears wider gaps are necessary The new Ferrite Isolator is a useful in ferrite record heads to avoid device with applications such as oscil- saturation. It should be emphasized lator isolation with the following that the use of a wider gap does not advantages to system performance: mean that a decrease in the sharpness of the gap edge is allowable. Reduces long -line loading The use of a wide gap record head Prevents undesired frequency shift would require special attention to Insures uniform powe- output the gap edges in order to retain reso- Improves transmitted pulse spectrum lution and to reduce record gap The charts indicate the exceptional performance anomalies in the frequency response of this light -weight unit (leas than Y lbs.) curve. REVERSE ISOLATION This shows very Wearing Qualities clearly the good // unilateral de- Originally thought of as wear re- , coupling effect between the an- sistant heads because of their hard- tenna and trans- ness, ferrite heads, at present, have mitter. wearing qualities which are poor. INSERTION Wear shows up as an erosion of the LOSS This illustrates tape contact surface. In many in- the exceptionally stances this erosion may appear all low loss from the transmitter to over the surface, but in most cases the antenna. it is concentrated at the gap edges, the worst location as far as head per- VOLTAGE STANDING i formance is concerned. Some wear WAVE RATIO í tests were performed on these fer- The VSWR intro- - ° duced into the ¡if1 TffMi11Mi1: rite heads by running them at a tape transmission line speed of 100 ips and then measuring by the 'Isolator.' the wavelength response at low tape Special unite can he produced by Kearfott speeds. A (i-metal head was run at to meet your frequency regcirements. the same time for control purposes. FERRITE RESONANCE ABSORPTION TRANS- A ferrite head (Head with a VERSE FIELD ISOLATOR for use where high #5) power handling capacity is required. This Hysol gap spacer was wear tested for new model operates over a 10% band a total of 83 hrs., corresponding to width, with these electrical characteristics: Greater than 9 db is3lation 2,400,000 ft. of tape. The tape used Less than 0.4 db insertion loss was 3 -M type 111 acetate backed VSWR less than 1.03 tape, and the normal force between Write or call today for complete detailed information on Kezrfott components head and tape was around 75 grams. and their application to your Radar No pressure pads were used. In Fig. Systems. 7 are shown photomicrographs of the gap edges after 35 and 83 hrs. of wear. The original gap was similar Olt COMPANY, INC. LITTLE FALLS, NEW JERSEY to that of head #15 but somewhat WESTERN MANUFACTURING DIVISION more irregular. The gap after 35 hrs. 14344 OXNARD ST. VAN NUYS. CALIF. of wear shows a definite wearing pattern. There are long scratches SALES OFFICES which do not appear to be serious Eastern Office: Midwest Office: South Central Western Area except as a possible 1378 Main Ave. 188 W. Randolph St. Office: Office: site for further Clifton, Nl. Chicago, III. 6115 Denlos Drive 253 Vinedo Ave. erosion. After the scratches, erosion Dallas. Texas Pasadena. Calif. appears; actual erosion can be con-

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use Inquiry card on lost page. 171 www.americanradiohistory.com BIRD Model Ferrite Heads (Continued from page 171) DIRECTIONAL WATTMETER sidered in two categories, surface erosion and gap edge erosion. Sur- Reads 2,;breee4... WATTS FORWARD face erosion may occur anywhere on are fa- WATTS REFLECTED-T« 50 Mk eaaæCz14l re4 a surface where conditions vorable, and in itself is not detri- Measures POWER into the antenna in the actual oper- mental to head performance. The ating circuit. monitoring Continuous if desired. type of erosion which is very serious Measures reflected power, direct reading. In antenna match- ferrite heads occurs at the gap ing work, results show directly in lower reflected power. in 35 hr. photomicrograph, Ideal for mobile equipment. edges. In the the directional qualities of the gap Tests 50 ohm r -f lines, antenna connectors, filters- quickly. edge erosion are quite marked. The ACCURATE because of high directivity and small frequency error. trailing gap edge, which is directed DIRECT READING - no calibration charts, no full scale against the direction of tape travel, meter adjustments needed. Meter scale reads directly for is badly eroded while the leading all ranges and is expanded for better down -scale reading. edge, which the tape slides off of, CONVENIENT -does not require reversal of r -f connec- shows very little evidence of ero- tions. No auxiliary power required. sion. Intuitively this situation seems Negligible power loss and insertion VSWR. reasonable. After 83 hrs. of wear the Full scale power range and frequency range are trailing edge is much more badly determined by the selection of plug -in elements eroded, and some erosion is starting from the following list. Model 43 with front element Frequency Range -25 -1000 megacycles in five ranges vis. 25 -60 in operating position. Dirnen- to occur at the leading edge; the (A), 50-125 (B), 100 -250 (C), 200 -500 (D), 400 -1000 (E). sions: 7" x 4" a 3" Weight, 4 pounds. surface erosion has also increased Power Range -10, 25, 50, 100, 250, and 500 watts full scale. Available in most frequency ranges. 50239 jacks for PL259 plugs appreciably. In Fig. 8 are shown available. Accuracy- 5% of full scale. Write for literature. wavelength response data showing r the deterioration in performance as a playback head as the result of BIRD wear. It can be seen that the bulk ELECTRONIC of the deterioration in performance CORP. has occurred in less than 23 hrs. of 1800 EAST 38T" ST., CLEVELAND 14, OHIO 1 wear. The deterioration then pro- TERMALINE Coaxial Line Instruments gresses slowly and there is evidence that a usefully long life could be realized at 0.5 mil wavelength if the direction of tape travel was not reversed. If the tape direction is reversed, the uneroded gap edge will erode rapidly so that no portion of the gap would be sharp or well defined. Evidence based on some experience with ferrite heads designed for 1.0 mil useful resolution indicates that, when both gap edges deteriorate, the shortest useful wavelength will be around 1.0 mil.

Wearing Properties

Wear data obtained on both sintered ferrites and single crystals without fabricated gaps indicate that the intrinsic wearing properties are appreciably better than those ex- LOW perienced with fabricated heads. For IMPEDS>. O.D. TYPE Nu Fift that reason methods of making the UL1 C 1 7.3 150 .36' WE ARE SPECIALLY ORGANIZED C11 6.3 173 .36 gap area physically more like an un- TO HANDLE DIRECT ORDERS OR C 2 6.3 171 .44' gapped ferrite have been devised. ENQUIRIES FROM OVERSEAS C 22 5.5 184 .44' One thought is that when the gap SPOT DELIVERIES FOR U.S. C 3 5.4 197 .64' is very short the tape surface cannot BILLED IN DOLLARS - C 33 4.8 220 .64' get down into the gap region and SETTLEMENT BY YOUR CHECK C 4 4.6 229 1.03` erode the trailing edge; if the joint CABLE OR AIRMAIL TODAY C 44 4.1 252 1.03' were perfect this certainly appears reasonable. It appears unlikely, at Wr this time, that a head with usefully C W ' MX and SW SUBMINIATURE CONNECTORS NG Constant 50n -63n-70 n impedances high output will have a short enough gap to successfully resist wear. For this reason it appears that something TRANSRADIO LTD.138A Cromwell Rd. London SW7 ENGLAND CABLES: TRANSRAD, LONDON must be done in the gap or within

172 For product information, use inquiry card on last page. T =L_ -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com the material in order to decrease PORTABLE PHONOGRAPHS TV BOOSTERS NDUSTRIAL and MEDICAL EQUIPMENT this gap edge erosion. A technique which holds some promise, is to fill in the gap with a When You Need glaze material which is nonmag- netic, bonds well to the gap faces, and is hard. Such a glazed head (Head #10) was fabricated and subjected to wear tests at 100 ips. A bated fabrics... photomicrograph of this head is shown in Fig. 9. Most of the gap was clean and straight when new. Fabric -covering problems vary with the size After 48 hrs. of wear (1,450,000 ft. and shape and function of the carrying of tape) the head has a large amount case. Here's the cue for APEX specialists! of surface erosion and the gap edges For fast -colored, durable fabrics to make have eroded somewhat. The directional wear qualities are not very your units SELL faster and LAST longer ... obvious on this head. It can be seen ask men who KNOW. AQEk that this head has not eroded as 48 much in hrs. as the previous head It will cost you nothing to let APEX COATED in 35 Fig. 10 had hrs. In are shown specialists consider your problems. FABRICS wavelength responses taken after 21 and 48 hrs. of wear. After 21 hrs. the gap edges were relatively sharp giving a well defined null but there was For 29 Years apparently a loss in resolution. After HOUSE of SER''Cr 48 hrs. the gap edges were irregular enough to almost completely suppress the second peak, although the resolution at wavelengths longer APEX COATED FABRICS, Inc. than 0.5 mil was substantially un- changed. Comparison of the wear on 12.16 East 22nd St., N. Y. City 10 heads #5 and #10 indicated that the glazing technique has apparently in- SPring 7 -3140 creased the resistance to wear. In conclusion it can be stated that SOUND and PROJECTION EQUIPMENT PORTABLE TV SETS TEST INSTRUMENTS ferrite heads can be constructed which have resolutions, when new, comparable to metallic heads, and 980 SL ERIES POWER CONNECTORS that they compare favorably in per- U.S.C. formance with metallic heads con- Performance Plus with Double -Lead Screw Locking structed from thin lamination for high frequency use. They are, how- U.S.C.'s NEW Double -Lead Screw ever, deficient in wearing qualities. 980-34HSSL Locking Connectors provide easy (This paper was presented at the 1955 I.R.E. Con- V vention.) and speedy engagement and dis- r4 980-34M2SL engagement with maximum pro- 1+.. V tection of contacts and positive locking under vibra -shock conditions. Power Transistor Survey In the article "Survey of Power 980 -Sl. series (power) Double -Lead Screw Transistors Lock available with 12, 18, 24, and 34 Currently Available," by contacts. Rufus P. Turner, Registered Elec- Typical catalogue No. trical Engineer in the state of Cali- 980 -34HSSL side, cable entrance hood fornia, which appeared in June 980- 34HRSL rear cable entrance hood TELE -TECH, the footnotes to Table 980-34M2 receptacle used with hood 2 were inadvertently 980- 34F2SL plug used on chassis omitted in 980 -34F2 980 -34F2 plug used with hood printing and are as follows: 980- 34M2SL receptacle used on chassis (A) Emitter stabilizing resistor must be bypassed to ground with at least 2000 µtd (6 v) to prevent reduction of power gain. adjusted contacts *Accessability to wire junctions (B) Input resistance will be higher if emitter *Preserves performance of sensitively electrical and mechanical performance stabilization resistor is not heavily bypassed. with simple disassembly of hood *Insured (C) Stabilization of dc operating points necessary *No limitations on number of contacts *Vibrashock hood construction *Screw Lock to prevent collector current runaway. Hood Assembly independent of connector. (D) Non -inductive. (E) Per collector. Double -Lead Screw Lock available with 990 and Miniature series (F) With typical heat sink: 1/16 in. aluminum chassis 6 x 6 x 2 in. (G) Safe operation up to 70° C ambient. U. S. COMPONENTS, Inc_ f Auoofed with U. S. Tool and Mfg. Co., lac. (H) Common -base circuit only. These data placed in common- emitter section of table for con- 454.462 East 148th Street, New York 5S, N. Y. CYpress 24525 -6 venience only.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use Inquiry card on last page. 173 www.americanradiohistory.com D- Amplifier (Continued from page 149)

d 2 tdd(n) = [95(n)] _ (8) do- V1-772 By this we Original designers and manufacturers simple analysis, then, are able to plot all the important steady - of Synthetic Dielectric Capacitors. We state characteristics to a first ap- use plastic film dielectrics exclusively in proximation. Dodging the synthesis approach, we would juggle the val- GLASSMIKE PLASTIC our products. Where Size, Stability and ues around to obtain characteristics, FILM CAPACITORS Quality are essential, you can depend on improved in desirable directions. "Pyrex" glass encased, plastic film dielectric, Curves obtained from laboratory temperatures to 125 °C. Insulation resistance to Condenser Products. 10,000 meg x mfd. Types for DC and RF measurements may be directly com- applications. pared with the calculated ones. In a similar but more involved HI -VOLT POWER analysis of the dissipative section, we PLASTICON PLASTIC SUPPLIES obtain curves of the general nature FILM DC CAPACITORS Available from stock: 2KV, 5KV, shown by Fig. 5. These curves are 10KV, 15KV, 30KV, 50KV. Oil- filled construction not final; they only indicate the Voltage ranges from 600V DC to for smaller, lighter, more flexible units. Sepa- rate accessible compartment for 100KV DC or higher. Temperature characteris- rectifier tubes shape of the steady -state character-- tics to suit. in 50KV model. Also available in the 5KV, 10KV, 15KV, and 30KV power supplies.

PULSE FORMING NETWORKS ALL -PLASTIC MOLDED CAPACITORS Synthetic dielectrics for higher volt per mil Mylar' Molded Capacitors pioneered by CP. AAv and in dielec. Exceeds Jan C 91 electrical specifications. loading lower losses capacitor A CO: tric. Stable performance at high temperatures. DuPont trade name for Polyester Film. cocotant -k image 1 Ranges to 60KV. Designed to meet your require- ) ments. characteristics May we help solve your problems? Write, on company letterhead, stating your position. a - 1 , a = 0 ,/

Condenser products Company -- -td4\, Div. of New Haven Clock g Watch Co. dissipative 140 HAMILTON ST., NEW HAVEN, CONN. section image characteristics AlN = 1.3,a =.3 Ae) o .4 .8 l.o BLOCK UNITIZED ---n° wc r oo USE INDIVIDUALLY LPULSE INSTRUMENT OR IN MULTIPLE Fig. 5: Steady -state curves obtained by anal- COMBINATIONS ysis of the section network of Fig. 4 EACH INSTRUMENT COMPLETE -AND 0 Co_

EXPANDABLE. UNITS MAY BE ADDED 0 0 0 APPLICATION. selected m and a TO EXTEND RANGE AND . istics for arbitrary values. Actually, the time -delay FUNCTION CHANGE EFFECTED BY SIMPLE SWITCH OF REAR PLUG-IN CABLE curve may be maintained almost fiat to 85 %, or so, of the prototype, non - dissipative section cutoff frequency. For sine -wave, steady -state applications, the indicated Gaussian re- PULSE GENERATOR sponse curve may be replaced by a Model 2120A nearly straight curve with abrupt Internal sync. pulse source cutoff. (10 cps to 100 KC) Viewpoints on transient calcula- Variable main pulse delay tions are given in the following, but (0 to 10,000 p. s) since such calculations are quite Variable width main pulse elaborate, except for the simplest (.1 to 1,000 p. s) types of networks, the design engineer is inclined to avoid them and .02 1Ls rise time main pulse instead fall back upon practical ex- Accurate, high resolution perience, aiming at steady -state controls characteristics, which are known to See our Complete Display and i.e. short Demnnstro nn at he yield good pulse response, WESCON Show -BOOTH NO. 22 rise and decay times, reasonable Write for complete specifications: our Bulletin No. 2100.1/A freedom from overshoots, etc. and the Name of Our Representative in your area. Use Of Laplace Transform Laplace transform (and the asso- EXmont 8-6764 ciated Fourier transform already dis- 11861 TEALE STREET, CULVER CITY, CALIF. TExas 0.8006 cussed) plays such an important role

174 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com in D- amplifier design, including coupling devices, that a further discussion is motivated. Restricting ourselves to linear conditions, we find that transforms and associated poles- and -zeros techniques provide powerful tools, particularly if at least certain concepts of a synthesis approach are included.'2 This is true even if we concentrate on just one section of a stage, such as the one shown in Fig. 4, to extend our find- ings at a later time to the entire stage. The simplest but generally not sufficient approach in such an extension is logical reasoning, supported by empirical data. We proceed to apply Kirchhoff's voltage and current sum laws to the ladder networks, being prepared for the necessity to extend our treatment to include determinants and matrices. Our aim is to formulate NOW the Transfer Function for the D- amplifier section, expressing it via DuMont's problem was space the s- variable. One and the same initial formula then yields the fol- Compactness was the prime requirement for the DuMont cic, rui,.cr - a mobile lowing information, (a) via the com- unit which had to duplicate actual studio operating conditions in every respect. plex radian frequency s = v + jc It was absolutely necessary to confine the servic- the poles and zeros configuration in ing operations of various units to a limited area. Con- sultation with Grant representatives resulted in the the complex plane, (b) similarly the selection of the proper (Electronic Equipment) Slides transient conditions, after proper ap- for the DuMont Telecruiser. plication of the Inverse Laplace Have you a servicing and maintenance problem? Transform, (c) finally, the steady Grant Research and Development facilities are state condition for s = j:a. at your service. Let us assist you in the choice and Since ladder networks have al- application of Grant Slides to your equipment. ready been discussed, we will tie this subject matter to the following one by selecting a stage- coupling device GRANT INDUSTRIAL SLIDES for our discussion; a typical cathode Picture distribution ampbiie, unit, syn- Grant Pulley and Hardware Company follower coupler, used between chronizing generator and power supply 31 -73 Whitestone Parkway, Flushing, New York. units are mounted on Grant Industrial Write for information ...consult on any problem stages in a limited upper frequency, Slides. Units are normally retracted but cascaded D- amplifier. The cathode roll out for servicing and maintenance. follower circuit and its equivalent 1. Continuous ball bear- 2. Withdrawing release 3. Unit locks at 45 or 4. Maintenance, repairs is assumed known. Starting from ing action permits rods disengages them 90 degrees. Special easily made. Access is conventional circuit theory, we may non -jar chassis removal. from quadrant mechan- pivoted positions can be gained In a few seconds. Locks when fully extend- ism, enables unit to be obtained for individual Special slides give plus use the constant -current source, ccs, ed, unlocks to return. tilted by simply raising. requirements. or minus 90° tilt. equivalent circuit for the cathode follower (more appropriately referred to as "voltage follower "), and write down the following integro- differential equation, generalizing to the extent of considering the cathode lead inductance expressed as a shunt inductance 1/1' (P : reciprocal inductance in the unit yrneh) dv ANCHOR WELD BEAD C -+ Gv + P vac + i(t) =O,(9) dt INSULATORS for where i(t) contains the driving force TRICOLOR current waveform, and v(t) = y symbolizes voltages appearing in the TUBES circuit. Actually, each term in above generalization may represent several extruded terms of similar form. Via one or AEROFLEX* more substantiating relations, all Perfect insulation ... easy to attach ... economical. From variables except the output voltage stock and to your specifications. Also: safety glass mounting may be determined; the output volt- channels; dust seals; flexible bumper channels. polyethylen age being the only unknown in the 36-36 36th St., Long Island City 6, N. Y. RAvenswood 9 -1444 equation system. By means of its Chicago rep: Particular Integral (for steady state) Pat Malone. 3844 Sherwin Ave., Lincolnwood, Ill., Orchard 5-4246

TELE -TECH 8 ELICTRONIC INDUSTRILS August 1955 For product info,maoon, uso inquiry card on lost page. 175 www.americanradiohistory.com D- Amplifier (Continued from page 175) and Complimentary Function (for transients) , the above equation gives the complete answer to the problem. Instead of using the "classical" solution, we here read off each term in Laplace notation, obtaining a simpler, algebraic equation in the s -domain. For the moment ignoring the initial conditions, and assuming step - function excitation, we write the s- version of Eq. 9 in the general form

v I sCv(s) + Gv(s) + r - +- + ---- = o, s s (lo) After some computation work, the transfer function f (s) is obtained as the output -to -input voltage waveform ratio, here given for a simplified, inductance -free circuit,

Co, 1 Military or special yokes and focus coils designed to your specifications. f(s) - Production yokes for TV sets. Clerk s + g /Clerk gm g /Clerk For your answer to yoke problems write Dr. Henry Marcy today. (11) s ntronac g s(s + g /Clerk) where Co, is the cathode follower INSTRUMENTS, INC. grid- cathode capacitance, Ck its 100 Industrial Road Addison, Ill. Phone: Terrace 4 -6103 cathode capacitance, Ckgk = Ck + Cgk, g,n the transconductance, and g = gm +1 /rp -} -1/Rk, where Rk is the resulting cathode resistance. To obtain the transient in the time domain COMMUNICATIONS & ELECTRONICS we apply the Inverse Laplace Trans- form, POSITIONS FOR ENGINEERS 1 c +1 f(t) = - j f(s) eet ds. (12) PHYSICISTS 21rj ./ c -jw METALLURGISTS By proper use of transform tables, CHEMISTS we may get around the step -by -step of 12 cumber- CHICAGO application Eq. so that some integration in the complex plane will be avoided. In our exam- RIVERSIDE PHOENIX ple, the answer takes the simple LABORATORY LABORATORY form

f(t) = K1 - (K1 - K2) e-at, (13) Immediate, permanent positions in Mechanical and Electrical Engineering Divisions where K1 = gm /g, K2 = Cgk/Ckgk, PHOENIX: Outstanding opportunities for Metallurgical Physi- cists, Engineers and Chemists in the development and and a = g /Ckgk. Eq. 13 involves the production of semi -conductor products. unpermissible assumption of a non - consid- CHICAGO: Challenging positions in Mobile communications, energized initial system, and Microwave, Radar and military equipment research, design ering the fact that the method de- and production -to all grades of Electronics, Mechanical scribed may be expanded and ap- Engineers and Physicists. Join this rapidly expanding group plied to much more intricate circuits, with unlimited future and recognition for you. the final f (t) may be much more RIVERSIDE: This brand new laboratory needs advanced, expe- elaborate than indicated. Plotting rienced men in missile and military equipment systems Eq. 13, we obtain the time response, analysis and design. Enjoy superb working and living condi- yielding information about response tions in California at its best. time delay, rise time and decay time, Address résumé to D. E. Noble, Vice Pres. Motorola Inc., C & E Division overshoots and undershoots, etc. 4501 W. Augusta Blvd., Chicago 51, Illinois Considering the steady -state case, we interpret s in Eq. 10 as s = jtv,

176 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com for Nigh Speed ' low Cost Piercing of PRINTED WIRING BOARDS

TERMINAL STRIPS and SMALL METAL COMPONENTS ...the WIEDEMANN RA -4P Turret Punch Press

Locates and punches holes up to 11/2" dia. at the rate of 8C to 120 holes per minute Duplicates hole patterns to + or - .003" Rapidly positioned turrets carry all necessary punches and dies Maximum flexibility permits engineering changes at low cost Offers unmatched piercing economy for small and medium lot production

The RA -4P was built to the requirements of the printed circuit industry. Write for Bulletin 242 to learn how this machine overcomes the problems of WIEDEMANN MACHINE COMPANY piercing printed wiring boards. 4276 Wissahickon Avenue P. O. Box 6794 Philadelphia 32, Pa. Booth 1420 at Machine Tool Show

MERCURY RECORDS

CUTS MASTERS WITH . - REEVES- GOTHAM SYSTEMS ~

Use "KLIPTITE" Tabs are plated brass TERMINAL BLOCKS eyeletted to (Molded, Barrier type) and come TABS Made block, or separately. Tab with ANGLED combinations in various Self -locking Wire for AMP, angles, or flat, for single Terminals. or multiple connections. Several sizes and number terminals. Other terminal blocks available in approved All new materials range from SINGLE & DOUBLE POLE subminiature (shown) to Grampian "selected" Feedback disc ELECTRONIC SWITCHES jumbo (90 amps). recording cutterhead delivers wide frequency range, Top transient 30 cps to 20 kc, is silicone damped. Toggle handle, aircraft response flux correcting feedback, precision balanced type. Bakelite housing. armature ... extremely stable! Use in conjunction with With screw terminals, or REE VES.GOTHAM Amplifier ... capable of delivering 150 watts solder lugs. DC, or AC lì with less than .7% harmonic and intermodulation distortion up to 1600 cycles. One - from 40 cps to 15,000 cps. Includes oll equalization for all hole mounting. of today's standard recording curves, at all speeds.

Equipment Corp. LKA ELECTRIC MFG. CO., Inc 10 East 52nd St. Manufacturers of Electrical Wiring Deices RES beeves New York 22, N. Y. MOUNT VERNON, N. Y.?:;

SEE OUR EXHIBIT BOOTH 1507 WESCON

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 177 www.americanradiohistory.com D- Amplifier (Continued from page 176) new obtaining the complex amplification A(w) = A(w) exp. j0(w)

non -slip lacing tape 1 ak, jcuk, (14) joi a GUDELCE - H* -F jto This is the same result as we would rubber -coated nylon have obtained, using initially the Symbolic, or jcu- method, well -known to all electronics engineers. Plotting FUNGUS -RESISTANT... FLAME -RESISTANT A (54 and q (co), and the dif- delay d4) ((v) /dry, This new braided nylon lacing tape has a ferential time we obtain the three vital curves, unique rubber coating to prevent slipping. which describe the general steady - It is easy to handle, ties securely, speeds state performance of any coupling production because knots stay put! device, or D- amplifier section, treated in the same fashion. The Another Gudebrod development! same curves may be plotted from in laboratory. By Write for complete information measurements the reshuffling eq. (14) into its Thevenin and a free trial supply today. or Norton fixed emf or fixed current source, we directly obtain the output immittance (impedance or admit- GUDEBROD BROS. INC. tance), since this immittance is the SILK CO., same as the source immittance. By ELECTRONICS DIVISION EXECUTIVE OFFICES using the given applied input voltage, the impressed current, we 225 W. 34th Street, New York 1, N.Y. 12 S. 12th Street, Phila. 7, Pa. knowing can determine also the input immit- .M. tance. By the straight -forward technique indicated, we have then, starting from Eq. 10, analyzed a typical circuit both for steady state and transient behavior, and by designat- ing different numerical values to the CUSTOM -BUILT and MIL -T -27 R: s, C: s, and I': s, we may plot many for check- Plant" Tested Transformers families of curves, ready "in- ing in the laboratory. When this one or similar techniques are applied to Government Pulse Commercial Aircraft Toroidal Class H Miniature- Transistor Molded Grade 1, Class A Sub -Audio complete D- amplifier sections, such Audio Power Vibrator Atlantic -Seal as the one shown in Fig. 4, the com- MODERN FACILITIES COMPLETE SERVICES putation labor will be found to be In Plant Testing Complete Pulse Design Engineering Rapid Estimat- quite exhausting. Magnetron Test Equipment Extensive ing Immediate Sample Delivery In professional engineering ap- Research and Measurements Laboratory Top quality - at competitive prices RETMA and UL Specifications. Production proaches we refrain altogether from Write or phone for detailed information entering the solution via the time domain, using instead the method ATLANTIC TRANSFORMER DIVISION the writer prefers to call the Gener- OF NEW LONDON INSTRUMENT COMPANY, INC. alized Laplace Transform Method. 30 Hynes Avenue Groton 3, Conn. Here all equivalent circuit notations, to the extent possible, are introduced directly in the circuit diagram as s- domain notations, including all WANTED! initial conditions, added to the driving function, bringing it into the ELECTRONIC TUBES more generally useful "excitation enables us Transmitting Receiving Special function." This technique - - to use the time-saving Potentiom- Purpose, and Industrial Types eter Method.'s LARGE OR SMALL QUANTITIES Time and space do not allow us to go into a discussion of the power- Highest prices paid for your excess in- ful poles and zeros visualization, ventory. Immediate response to all offers. uses of potential analogue methods, and the general technique of apply- BARRY ELECTRONICS CORP. ing synthesis methods. If these 512 Broadway, Dept. T, New York 12, N. Y. fields are entered into, the reader WAlker 5 -7000 will find that the described approach fits well with the concepts to be used.

178 For product information, use inquiry card on last page. TELETECH a ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com CESE CINEMA switches for INSTRUMENTS AND Glass epoxy insulation brings CONTROL CIRCUITS an expanded range Types LP4-4 W. and LP5-5 W. shown. Also LP7 -7 W. and LPIO -l0 W. of characteristics to these new CESE Corning Low -Power Resistors Switches. Write for Radio and TV for catalogue on your letterhead. You'll find that Corning Low -Power Resistors perform admirably under the most adverse radio and TV operating conditions. Their resistance range is the highest of any low - power resistor. Small and compact, they save space. They are non - inductive and exceptionally stable. The fired -in film of metallic oxides on glass forms is CINEMA ENGINEERING CO. tough, abrasion -resistant, difficult to scratch. No need for special handling to prevent DIVISION AEROVOX CORPORATION damage during installation. The automatic resistance spiralling of these LP -type 1100 CHESTNUT ST. BURBANK, CALIF. resistors is electronically controlled. Press -fitted caps with axial tinned leads ready to solder complete the assembly. This guarantees reliable uniformity of the following characteristics. CHARACTERISTICS Range -The LP4 resistors are available from 200 to 40,000 Q; LP5 from 200 to 45,00052; LP7 from 200 to 36,000Q; LPIO from 200 to 50,000Q, with a --* 10% tolerance. Power Rating is based on 40° C. ambient temperature for the LP4 and LP5 resistors and 25° C. ambient for the LP7 and LPIO with an average hot spot of 275° C. Derating -With suitable derating, resistors can be operated at ambient temperatures over 120° C. Overload- Operated at 10 times the rated wattage for 5 seconds, is less 2 %. IMMEDIATE D IVERY resistance change than ... BOO n from Soldering- Permanent change in resistance due to normal Wide range of mes soldering technique is less than 1/2%. i ::: : large Pittsburgh sto Moisture- Resistance change is less than 1% after 100 hours at an ambient temperature of 40° C. and 95% relative humidity. At Radio Frequencies-The LP resistors are essentially non- SPECIALIZING IN grime... ::::::::: Extra fine precision- I: ::ea' inductive. Mechanical Protection -A high temperature lacquer coating """"" woven meshes used : : :r ; @ : : : : :: provides added protection during handling. 'n electronics industry. Nwr. Availability-Immediately through Corning Glass Works or authorized distributors of Erie Resistor Corp. For new low prices and other information send the coupon, or write to Corning Glass Works, Corning, N. Y. V

Bross, copper, monel on pure nickel etc. Available in a variety of weaves, with stainless steel and phosphor - - - -- 7 /Xactrs.useare e G7eee - - -- bronze regularly woven up to 400 X 400 mesh. r- CORNING GLASS WORKS 37 -8 CRYSTAL STREET, CORNING, NEW YORK New Products Division FACTORY ENTERPRISES, INC.: Please send me descriptive catalog sheet on Corning Low -Power Resistors. Nome Title 3431 BUTLER STREET, PITTSBURGH I, PA. ... Company TELEPHONE MU i 1199 . Address

City Zone State L

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 179 www.americanradiohistory.com Structural Dielectrics

Microwave (Continued from page 89) Assemblies, will be called the power transfer ef- Radar ficiency, defined as the ratio of total Components, power radiated by the antenna to and Precision the power delivered by the trans- See us at BOOTH 1713 Instruments mitter. An ... manufactured equivalent circuit of the antenna system in the low frequency Western Electronics Show and designed is to your range shown in Fig. 3. The power and specifications. transfer efficiency for most typical systems can be estimated by the re- Convention lation shown by using some assumptions concerning relative values of certain components. The main assumption is that changes in the dielectric constant of the insulating material will not change the antenna

August N. R. K. Mfg. & 24, 25, 26 Engineering Co. 4601 W. Addison St. Civic Auditorium Chicago 41, Illinois San Francisco, Cal. Represented by Tubergen Associates 2232 West Eleventh St., Los Angeles 6, Col. .d C0.l00Cience tn..e p } .c..E . - Fig. 7: Power transfer efficiencies

capacitance appreciably. Measure- R.F. and PULSE ments have shown that the removal of the insulating band has a relatively small effect on the antenna CONNECTORS capacitance indicating that most of the field lines associated with the capacitance are external to the dielectric and are hence not disturbed DICO designs and manufactures a by changes in the properties of this complete line of highest quality material. It is for this reason that variations in capacity of the dielec- standard or custom -built R.F. or tric material were not measured in Pulse connectors. these tests. The term Q. is the Q of the coil in the matching unit which resonates with the antenna capacitance. This factor accounts for losses in the antenna matching unit which are assumed to be all in the inductive This comprehensive line includes matching element. - The power transfer efficiency is BNC, N, C, HN, SKL, LN, LC, BN con - shown in Fig. 4 as a function of the nectors, Pulse connectors, adapters, ter- ratio of dielectric loss to antenna minations, couplings, crystal holders, test conductance for a few values of a jacks, cable assemblies and sub -miniature constant Q. to Q. ratio. Of interest connectors. to note here, is that the power transfer efficiency decreases at various rates depending on the antenna impedance and matching unit losses as DIAMOND the dielectric loss is increased. Also, Send for Catalog 53E. MANUFACTURING CORPORATION if the efficiency is required to exceed 7 North Avenue, Wakefield, Mass. a certain minimum value, then the maximum dielectric loss permitted will be less for higher ratios of Visit us at Booth No. 710-WESCON SHOW, San Francisco Q./Q.. The effect of dielectric loss

180 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com on the antenna performance hence cannot be calculated on the basis of the properties of the material alone. The decrease in radiated power caused by the presence of a dielectric material with given loss characteristics in the antenna gap will be strongly dependent upon the antenna impedance, the matching unit efficiency, as well as the geometry of the gap region. As a result of these factors, the requirements of the electrical quality of insulating materials FM TRANSMITTERS. Crystal Controlled and Variable Reactance for antennas of this type vary widely of these rugged from one antenna system another. Assembly RF AMPLIFIERS for boosting R.F. signal strength to building blocks into an An estimate of the total equivalent SUBCARRIER OSCILLATORS. Voltage Controlled, Bridge Acti- integrated system is a simple vated, and Variable Reactance 14 and easy process. Analyze 3 COMMUTATORS AND DYNAMOTOR-COMMUTATOR GAT- :12- 160 F, 99% R N. your telemetry requirements, -- CYCLING 70r-110r, ING UNITS for expansion of system capacity by subcarrier 84-87A R.N. sketch your block diagram, - i.6r12 PANELS and select the required commutation units from RREP's full line UNIVERSAL MOUNTING ASSEMBLY: of FM transmitting UNERAC (Universal Regulator. Amplifier and Calibrator) equipment. You've then and UNIVERSAL MOUNTING UNITS for mounting all got the finest airborne RREP Oscillators system available. TENTATIVE LIMIT -- DYNAMOTORS for high voltage supplies Technical Bulletins giving complete Information on these units are available on request. 00 50 6o OMS EXPOSURE RAYMOND ROSEN Fig. 8: Deterioration with temperature PRODUCTS, INC. shunt conductance which appears ENGINEERING 32nd and Walnut Streets, Philadelphia 4, Pennsylvania across the terminals of the antenna Western Regional Office: 15166 Ventura Blvd.. us at WESCON -Booth 231 due to dielectric loss can be made See Sherman Oaks. Los Angeles. California from loss data measured on a l;all panel of the material and a k :.owl- edge of the gap width, total gap periphery, and thickness of the dielectric material of the particular aircraft antenna. MIL -A -9080, the specifications for the design of these antennas, recom- mends that the loss of the samples be measured over the frequency range 2 -6 MC using a test jig that places the material in a field similar to that which it encounters in service. However, MIL -P -8013, the ma- DICO designs and manufactures custom and standard Co -axial Line and Waveguide terial specification for these types of components. These are produced under plastics, requires that the electrical highest quality control standards, a typical example being ... characteristics be determined at 1 Mc using a 2 in. diameter sample and sample holder. Loss measurements made by the standard disc method were not considered valid, however, because in this test the electric field is impressed normal to the plane of the laminations where the field in cap antennas is impressed essentially parallel with the laminations. Tests made with the standard sample holder on Vs x I/s x 2 in. samples of various materials oriented with the field first parallel and then perpen- dicular to the laminations showed far greater loss in the parallel direction, especially after environmental exposure. However, the inaccu- MICROWAVE CORPORATION racies inherent in dielectric meas- Send for catalog 953 urements of such small samples 7 North Avenue, Wakefield, Mass. limit the usefulness of this test. For this study a sample holder Visit us at Booth No. 711 -WESCON SHOW, San Francisco

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on Irrst po9c. 101 www.americanradiohistory.com Structural Dielectrics (Continued from page 181) tb d WEST-CAP was designed according to MIL -A- /. 9080, simulating the field in a typi- CAPACITORS cal installation as shown in Fig. 5. The sample size was 12 x 6 x 1/8 in. By using the image -plane technique, it was possible to use samples hav- Announces a new RUGGEDIZED ing only half the width of the an- Vertical Mounting Type Capacitor tenna gaps of interest and also to employ an unbalanced measuring with unsurpassed characteristics system. MODEL SHOWN WITH total SPADE TERMINAL AND for applications designed with To calculate the equivalent MILLED FLAT FOR shunt conductance across the an- POSITIVE LOCKING. critical requirements in tenna terminals from conductance values measured with the samples, the conductance of the sample is v/ VIBRATION ALSO AVAILABLE IN multiplied by the ratio of the periph- MIL - C - 2 5 A RELIABILITY eral length of the gap to the sample

C P I I T Y P E S W I T H length. AXIAL WIRE LEADS. WEIGHT The sample conductance was determined by measurements of the v/ APPEARANCE conductance of a resonant circuit with and without the sample in the using susceptance varia- Booth 305 circuit, the Visit Our tion method. A Q raising circuit us- At WESCON SHOW ing an active negative resistance ele- San Francisco, Calif. ment was used to increase the range and accuracy of measurements. By the use of negative feedback in this FERNANDO ELECTRIC MFG. CO. circuit, stable Q's of the order of SAN 100,000 were achieved with commer- 1509 FIRST STREET SAN FERNANDO, CALIF. cial power supplies. A special vernier capacitor of coaxial type was designed to give a linear capacitance change of 0.05 uuf per turn of the control shaft. Fig. 6 shows the meas- 1-1-F uring equipment and sample holder. Equipment components and layout NoiseNoíse Source were designed for simplicity and re- Long- Lived, Low Cost Tubes liability of operation so that measurements could be made by non- No Balun Requirements technical personnel at specified times No Tuning Required during the environmental tests. This simplified noise source operates be- NEW LONDON Measurements were made a 2, 4 tween 50 and 900 mc. It's fast and accurate, and 6 MC. ideal for testing television tuners and receivers INSTRUMENT in the laboratory and on the production line. Noise figure: 0 to 19 db; Accuracy: 1 db pa nL_ max. at 900 mc with equipment having an Power Transfer input impedance of 300 ohms. *0.5 db be- 82 Union Street efficiency for low 400 me regardless of input impedance. New London 3, Conn. The power transfer Write for Catalog four typical tail -cap antennas as a function of the loss of 12 x 6 x 1/3 in. sample are shown in Fig. 7. The Advantages frequency with the least favorable Extreme flexibility antenna impedance is shown for Fast quiet switching each aircraft. A constant coupler Q Crosstalk down 60 Db at 10 MC of 100 was assumed. Aircraft A and Any group of setups may be held D are large aircraft with large iso- intact while setting up others lated section antennas. However, Provision for spot or remote control differences in gap dimensions make Strapwiring eliminated the performance of aircraft A less Individual magnets at Excellent HF characteristics dependent of dielectric loss and each crossover. crossbar Palladium contacts therefore able to tolerate a larger A truly missalar switch Reduced cost Maximum, six conductors increase before the antenna perfor Compact design, small size per circuit. formance falls to an unacceptable MASTER CONTROL AND life to 100 million MONITOR SWITCHING OF Low operating power -2.5 watts -tested value. Aircraft B is a small aircraft AUDIO & VIDEO CIRCUITS Simple "package" installation operations. but with a relatively large dielectric Also gap width. Although the efficiency TELEMETERING INC. COMPUTERS JAMES CUNNINGHAM, SON & CO., is less by TELEPHONY DELAY LINES is initially low, it affected D,pt, T -1, Rochester. New York Teh &Aker 7240 ETC. increase in dielectric loss because of

182 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Miniature Constant Speed A.C. 60 Cycle

MOTOR High Output Torque with Planetary ADV NEED Gear Reducer long life

Precision -built hysteresis - DESIGNS IN synchronous motor provides constant speed from no-load to maximum rated torque. Furnished for single phase REMOTE CONTROL capacitor-run operation for 1800 and 3600 RPM motor speed at 60 cps. Units are also OUTMODE ALL OTHERS! available for 2 or 3 phase operation. Winding is for 115V A.C., and may be varied for special applications. Planetary Here - the most advanced remote control units for gearing provides 18 standard speed reduction ratios from radio station transmitters ever devised. Rust Indus- 18.78:1 to 21,808:1. Output torques range from 12 oz. in. trial, pioneers in the field, now offer two new to 1000 oz. in. Diameter It/yrr, Length depends on ratio. systems that give you performance and depend- Weight 9 to 12t/2 ozs. Service life up to 5000 hrs. Units meet ability never before achieved!. Proven in actual military specifications. Write for details today! operation in both full time directional and non - GLOBE directional stations, where continuous operation is INDUSTRIES, Inc. paramount, these systems are custom -engineered 1791 STANLEY AVE., DAYTON 4, OHIO to each station's requirements ... and complete in every respect. Write about these advanced systems today. Start saving thousands of dollars tomorrow!

PRODUCTION -TEST TV TUNERS AND RECEIVERS WITH KAY Marka -Sweep MODEL RF -P

A combined all electronic sweeping oscillator and sound -picture marker gener- lÚ ator. Used with on oscil- industrial co., inc. loscope, it will display the 0 response of a TV receiver 130 SILVER STREET over a 15 me band width centering on the desired MANCHESTER, NM. channel. SPECIFICATIONS Frequency Range: Sweep Voltage Output: VI IF-TV channels. IF band at Sawtooth sweep is available at out- 43.5 me. put posts for scope deflection. Frequency sweep: RF Output Voltage: Sawtooth sweep 15 mes wide each 300 ohm balanced. 1.0 v. into channel. Sweep repetition rate open circuit. 70 ohm unbalanced. synchronized to 60 cycles. 0.5 v. into open circuit. Markers: RF Output Control: Pulse -type marks crystal positioned. Switched attenuator -60 db switch. Picture and sound carrier markers able. Continuous attenuator -ap- provided on each RF channel. IF proz. 6 db. picture and sound carrier markers Marker Output Voltage: or any 2 IF marken separated by Positive pulse, 10 v. peak 4.5 me provided on special order. Marker Output Control: Markers go directly to scope, elim- Continuously variable, 0 to max. inating disappearance to traps as Power Supply: 24 FUNCTION 10 FUNCTION well as overloading of circuit under 105 to 125 v., 50 to 60 cps. test. Power input approx. 100 watts. SYSTEM SYSTEM Accessories Supplied: Shielded 70 ohm output cable with Recommended for use in di- Recommended for use in non - Instniments with more than 2 BVC connector; matching trans- rectional and multi- transmit- directional installations where markers on each channel avail- former or pad, 70 ohms unbalanced able on special order. to 300 ohms balanced. ter installations where up to no more than 10 control and (2 IF crystal positioned 24 control and metering func- metering functions are re- Price Fos plant marks added $795. at specified frequencies -$15.00) tions ore required. quired.

For complete, detailed specifica- Kay Electric Company tions, write, Dept. TT -8 14 Maple Avenue, Pine Brook, N.J. CALL, WIRE OR WRITE FOR FREE CATALOGUE!

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use Inquiry card on last page. 183 www.americanradiohistory.com One -Half the Size of a Structural Dielectrics (Continued from page 182) the greater gap width and smaller dielectric area. MIL -A -9080, the Standard BNC! specification for the performance of liaison antennas, requires the efficiency to be at least 25% in the fre- ACTUAL quency range of 2 to 6 Mc. For these SIZE antennas the maximum allowable conductance of the dielectric sample would be 3.0 ['mhos for aircraft A, 1.4 ['mhos for aircraft D, but only .75 ['mhos for aircraft B. The antenna NEW DAGE DM SERIES design of aircraft C is such that even with zero loss in the dielectric the COAXIAL CABLE CONNECTORS performance of the antenna would not meet the minimum requirement. Since the initial conductance of all weatherproofed and sealed materials examined in this program proof quick disconnect vibration I is of the order of 0.1 ['mho for this mechanically rugged withstand extreme temperatures 1 size sample, the allowable increase heavy silver plating due to environmental conditions can be adapted to any miniature cable varies from effectively zero times requires no special tools for assembly I for aircraft C to thirty times for air- all general types available 1 craft A. These values will be com- 1 pared with the characteristics of ac- BE SURE TO SEE DAGE DM SERIES 1 tual materials tested in a later part 1 of this paper. These results again emphasize that the dielectric loss will affect the performance uniquely for each type antenna. The maximum allowable di- Phone Write Wire for samples and detailed information electric loss can be estimated when the antenna impedance and gap con- DAGE ELECTRIC COMPANY, INC. BEECH GROVE, INDIANA figuration are known. This will allow a limit to be set on the permissible increase of dielectric loss due to environmental exposure. . , now YOU can buy Quality Control The electrical requirements for TRANSFORMERS structural dielectric materials having been defined, the next phase of the study was concerned with two questions: (1) Is the performance of available materials adequate under service conditions? (2) Are the present specifications and quality controls adequate for insuring production of con- for COMMERCIAL sistently good material? Structural dielectrics currently in use consist of laminates made of and GO VERNMENTapplications! glass fabric and resin. No other ma- Among the types For years Federal has made many of will do this particular job, used by divi- we manufacture: terials the iron core components other types of reinforce- sions of the world -wide IT &T System. Open frame although Now the engineering, production skill End bell ment such as refined asbestos may and facilities back of these high -quality, Commercial potted be developed for this use. The lami- long -life units are available to you... Encapsulated nates are usually cured at low pres- for commercial and government use. Hermetically sealed sure, around 15 psi, for economy in Tell us your needs ...we can design High temperature most exacting tooling. and produce to meet the Miniatures specifications. The principal resins in use are the MIL -T -27 facilities polyesters. Some epoxys are em- ANE -19 compliance Send your requirements to ployed although their initial electri- Transformer Sales Dept. Complete assembly cal properties are not quite as good Federal Telephone and Radio Company as those of the polyesters and they CORPORATION in A Division of INTERNATIONAL TELEPHONE AND TELEGRAPH are more difficult to handle pro- N. COMPONENTS DIVISION 100 KINGSLAND ROAD CLIFTON, J. duction.

184 For product information, use inquiry card on last pogo. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com The antenna specification MIL -A- 9080 states that the laminates are Working Models with governed by a material specification MIL -P -8013, which in turn cites ILLUMINATED PUSH BUTTONS other controlling specifications for Will be exhibited! resins, fabric and finish (or coupling See this, New agent). Lastly, the manufacturer's Delivery in near future process specification, when approved SENSATIONAL by the Air Force, becomes a part of this quality control system. Push Button Switch The material specification sets forth requirements for dielectric constant and loss tangent at 1 mc, tested with the electrical field im- BOOTH 813 pressed normal to the laminations. 1955 WESCON SHOW Material is tested as received and Civic Auditorium after immersion in distilled water at San Francisco room temperature for 24 hrs., in which condition slightly reduced values of limiting electrical proper- ri ties are listed. The antenna specification calls for a similar immersion O test, but for 72 hrs. FUNCTIONS ADAPTABLE TO NEEDS Environmental conditions for test- Interlock. Actuating of a button automatically restores to NEW FEATURES normal, button previously actuated. Non -locking. Each button has momentary action. The "Multi- Switch" has All -lock. Accumulative features never locking -all buttons restored to normal before avail- by actuating release button. able. Flexible tools -2 to 12 stations possible. Up to All -lock and non -lock combination. Choice of functions. 4 stack switches can be Interlock and non -lock combination. Various arrangements operated by each button - possible. and many other features.

Send details of require- swxtc«ta.-.-- I M C. -+-.- ments or write for bulletin S-550 8 161. 1334 N. Halsted St. Chicago 22, III. Canadian Representative: Atlas Radio Corp., Ltd., 50 Wingold Avenue, Toronto, Canada.

FREQUENCY STANDARD .. with ultra high stability Determines frequency with exceptional Fig. 9: Voids In one bath of laminate. Voids hod accuracy! This model 701 features a unique no effect on deterioration method of temperature stabilization that achieves an unusual degree of frequency ing deterioration of mechanical stability. tigrade: OUTPUT FREQUENCIES: 10 kc -50 48 me 10 kc, 100 kc or 1 me intervals, from properties consists of two hours in FREQUENCY STABILITY. After hours of at operation: (I) 1 part in 10' per 24 hours, front output connector through resistive at- boiling water or thirty days in wa- (2) 1 part in 10' for * 10` r line voltage tenuator, 100 kc sine wave from rear con- ter at room temperature. change, (3) 1 part in 10' per degree Cen- nector. Write for catalog. To investigate these requirements, samples of laminates representing NEW LONDON INSTRUMENT CO., Inc. production material were obtained 82 Union Street New London 3, Conn. from three major aircraft manufacturers. Several samples of each material were exposed to various en- SeeZak products provide for the mounting vironmental conditions as follows: of components upon individual plate - (1) Air at 160 °F., 20% R.H. modules, which are easily removed for lay- (2) Air at 160 °F., 99% R.H. out modifications. This makes flat panel (3) Concentrated ozone organized wiring possible. Panels then can be made (4) Simulated solar radiation at into standard chassis. And these chassis electronic may be extended or modified later by add- 70,000 ft. altitude system ing or replacing panels or rails (sides) as (5) Alternate freezing and thaw- required. All have been specifically devel- ing oped to assist the circuit designer. (6) Military specifications condi- Send for new brochure tions ...A NEW IDEA IN BREADBOARDING (7) Natural aging in standard atmosphere U. M. & F. MANUFACTURING CORP. Exposure periods extended up to 10929 Vanowen Street North Hollywood. California sixteen weeks. Properties measured

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product Information, use Inquiry card on last page. 185 www.americanradiohistory.com Structural Dielectrics There is a (Continued from page 185) before, during, and after exposure KAHLE were conductance at 4 Mc, weight, flexural strength and stiffness, and flexural fatigue strength. Conduc- MACHINE tance at 2 and 6 Mc was measured SUB -MINIATURE TUBES RADIO RECEIVING TUBES before and after exposure only. to speed every 24 MEAD The environmental conditions operation in the were not intended to simulate actual service conditions but rather to ex- manufacture of aggerate them, to find cut under which environments deterioration occurred. In judging the performance CATHODE RAY of the DIODES TUBES materials, the limits for flexural strength and stiffness were taken TRANSISTORS from the military specification. A RADIO TUBES tentative conductance limit was set TRANSMITTING TUBES up by calculating the average of CATHODE RAY TUBES values which would result in a system efficiency of 25% for the four X- RAY TUBES aircraft investigated. This value was MERCURY SWITCHES 1.47 µmhos at 4 Mc for the standard test panel 1/s x 6 x 12 in., tested with RELATED DEVICES GRID WINDER a width of 12 in. and a gap of 6 in. Wire or write - sending details of No basis for judging fatigue resis- your requirements or problems. Designers and builders of tance exists in the specifications so special automatic and semi- the test values were simply com- automatic equipment for all pared among themselves. ENGINEERING COMPANY %iáhle 1311 Seventh St., industrial operations. North Bergen, N. J. Test Results Twelve laminates were tested consisting of eight polyester, two epoxy and two polyester -TAC materials. BIG SAVINGS No significant deterioration occurred in the hot dry air, the ozone, the solar radiation or the natural aging conditions. In the hot humid air condition, ...... E1 eleven of the twelve materials PROCESS YOUR OWN showed serious electrical or me- 16mm & 35mm FILM chanical deterioration, or both. All AFTER SHOOTING.' these materials were acceptable un- IMMEDIATELY der the electrical requirements of the specifications and all except one Factory Re -built under the mechanical requirements. There was no apparent correlation between electrical and mechanical HOUSTON K -1A deterioration. FILM PROCESSORS In alternate freezing and thawing, PORTABLE WATSON CINE' DEVELOPING reductions to 10% occurred in . up one OUTFIT . provides a SIMPLE, EFFI. Chance of a lifetime to buy CIENT, ECONOMICAL and SPEEDY means flexural strength, the epoxy lami- of these top quality Houston for PROCESSING up to 200 it. of 16mm or 70mm) least No processors at far below cost. 35mm (also film- nates being the affected. LOW COST Uniform Processing! Req- electrical deterioration was ob- Completely self -contained. Day- uires only I gal. of solution. light operating. Automatically 3 nesting tanks- reels- scratch -proof loader served in this condition. processes 16mm black and white PREFERRED by MORE Professionals Insignificant changes were pro- reversal motion picture film. Easy SIMPLE operation MINIMUM cost- duced by edge sealing or by coating to operate. Produces fine results. FULLY GUARANTEED- prices from. 588.00 with an Air Force approved rain Factory re -built and guaranteed Exira Reels Tanks etc., available. resistant compound. In some Write for FREE Processing Booklet. Dept erosion by the original manufacturer. cases deterioration was accelerated Also available "as is." Large stock BURKE E. JAMES, INC. 321 So. Wabash, Chicago 4. by stressing the samples. of parts available. Write for cata- Having found the combination of log and prices today. heat and humidity to be the chief HOUSTON FEARLESS deteriorating factor, and believing Div. Color Corp. of America the 160 °F. and 99% R.H. condition 11805 W. Olympic Blvd. to be exaggerated with respect to Los Angeles 64 Calif. service conditions, a realistic en-

186 For product information, use inquiry card on lost page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com vironment was set up in a chamber consisting of temperature cycling between 70 °F. and 110 °F. at about ENGINEERS;. 85% R.H. This was named the Ran- `DESIGNERS -DRAFTSMEN'S goon condition since it approximates Electronic Mechanical the climate of that region in the spring of the year. It was found that electrical deterioration was more severe in the Rangoon condition than in the origi- What's fritat Melpar nal test at higher temperature and Melpar has just opened its new plant at Falls humidity. This comparison is shown Church, Virginia, in a beautiful suburban in Fig. 8 for representative materials location. We have also moved to larger A and B, which are polyester lami- quarters at Watertown, Mass., and opened nates, which is a new research department at Cambridge, and Cl an epoxy Alt Mass. laminate. The tentative limit shown Melpar's continued expansion offers new in the figure was defined earlier. career opportunities for individual growth Two representative materials and recognition. Men of vision and imagina- reached the tentative limit of con- tion who plan for the future are quick to ductance after about ten and four- sense the potential with this growing, teen days respectively in the Ran- dynamic organization. goon condition. The order of merit Continued leadership in electronic research and development is reflected in our current of the materials was the same in group of projects with long -range military and industrial application. both types of environment. The me- Network Theory Rad'r & Counter. chanical was less measures deterioration se- Systems Evaluation vere than in the 160 °F. condition, P- ck'n'nn Electronic Automation Equipment but the worst polyester lost 23% of For personal interview tend resume to Pulse Circuitry its strength in sixty days, while the Microwave Technique Technical Personnel Representativo, UHF. VHF or SHF Microwave Filters void free epoxy lost 15 %, which is Receivers Flight Simul:.tors more is Analog Computers ; melpar, inc. than allowed by the military Servomechanisms Subsidiary of Westinghouse Air Brake Co. specifications for epoxy resins. Digital Computers Suhminiaturi:ation I Blvd., Dept. TT Magnetic Tape Electro- Mechanical 3000 Arlington 20

Handling Equipment Design I Falls Church, Virginia

Processing Quality Control & Test Engineers I or 11 Gallen St., Watertown. Moss. Because wide quality variations were found in nominally identical samples and because chemically similar samples also varied drastically in resistance to deterioration, a program was started to investigate the have your electronics engineering raw materials and processing factors responsible for this performance. problems solved abroad! Laminates reproducing those which pleted in minimum time, with utmost effl. gave unsatisfactory performance Only New London offers ciency, and at no sacrifice of quality. were made at Stanford Research In- this unusual (and economical) service: The engineers employed by the American stitute and tested under various en- electronics research and development per- Eastern Electronics Division are top special - formed by engineers in Israel. fists in circuitry. Many are U.S.-trained, with vironments of heat and humidity. This exceptional facility, located near considerable experience in U.S. industries. This program, which is still going Tel Aviv, enables you to employ leading They have at their disposal all the advan- on, has shown conclusively that specialists in solving your audio, VHF and toges of extensive, modern laboratories, slight variations in UHF problems. And doing so actually costs and can supply you with complete plans the quality of much less. furthermore, projects are corn- and prototypes to your specifications. raw materials in or the processing Look into this new service today proposals on request can cause very large changes in - re- NEW LONDON INSTRUMENT COMPANY, INC. sistance to deterioration. AMERICAN EASTERN ELECTRONICS As a result of these evaluations, DIVISION it is concluded that within the limits 82 Union Street New London 3, Conn. of present specifications and quality control procedures, materials are likely to be produced which are The Heidenreich Company electrically not suitable for cap -type antennas and which may be subject 6115 Denton Drive Dallas, Texas to serious mechanical deterioration. Phone: Dixon 3389 Factors not yet understood and certainly not controlled by present Distributor Sales: Max N. Heidenreich standards, are the determining in- Jobber Sales: Harry A. Maas, Jr. fluences in the quality of the final Industrial Sales: Jack Heidenreich product. Office Manager: Georgia Brown Experiments made at Stanford Re- Territory: Texas, Oklahoma, Arkansas, West search Institute indicate that the Tennessee, Mississippi, & Louisiana most important of these factors are Warehouses: Dallas, Houston, & New Orleans the cleaning of the glass fabric, the Representing Manufacturers of Associated Electronics. compatability of the coupling agent

TELE -TECH 8 ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 187 www.americanradiohistory.com t%ze'd BIG HELP IN TERMINAL WIRING! Th e Correct wire to Corrterminal tevery timei 7e1 GOLDAK U-238 ELTRONICS RAD.TEK JON ES FANNING STRIP Connections are made ZERO STANDARD CASE CUSTOM DRAWN through Fanning Strip, Z64- 112.34 Z64. 112 -16 CASE AND COVER on bench or anywhere apart from barrier strip, Coast and quickly slipped Instrument Manufacturers from into assembly. to Coast use Cases Produced by the Designed for use with Jones Barrier ZERO METHOD of Deep Drawing Terminal Strips Nos. 141 and 142, for 1 El- tronics, of Philadelphia, and The Goldak Co., of to 20 terminals. 9 -141 Barrier Strip Glendale, are two of many precision instrument manu- Simplifies and facilitates soldering. Insures facturers who checked the Zero Method. Like Bendix, positive correct connections. Saves time. 9 -161 I.B.M., R.C.A., Stoddart and others, they are pleased Ideal for harness or cable assembly. Fanning and price. Strong construction: Brass terminals, cad- Strip. with both quality mium plated. Pot. Whether for custom or stock (over 900 standard Heavy bakelite mounting. applied for. "See nrw developments at WESCON Show -Booths 712 -713" sizes) precision, seamless, deep drawn boxes -call on Zero. Write for our latest catalog. HOWARD B. JONES DIVISION CINCH MANUFACTURING CORPORATION CHICAGO 24, ILLINOIS RO MANUFACTURING COMPANY OF -CARR FASTENER CORP.

Don't sit back

MADE TO YOUR EXACT SPECIFICATIONS IN ANY SIZE, SHAPE, QUANTITY Precision coil bobbins are fabricated from high dielectric materials and quality controlled to the most minute tolerances .. . Yet, because they are made on special high production equipment, they're available to you for prompt delivery at low unit cost. Cores are spirally wound dielectric kraft, fish paper, acetate, phenol impregnated or combinations. Flanges are cut to any specification for all types of mountings. Request illustrated bulletin. Send specifications for samples. We also manufacture paper tubes in all sizes, shapes, ID's and OD's. Sales Representatives in: New England: Framingham, Massachusetts, Trinity 3 -7091 Metropolitan New York, New Jersey: Jersey City, New Jersey, Journal Square 4 -3574 STRIKE BACK! Up late New York: Syracuse, New York, Syracuse 4.2141

No thern Ohio, Western Penn.: Cleveland, Ohio, Atlantic 1 -1060 Indiana, Southern Ohio: Logansport, Indiana, Logansport 2555 California: Pasadena, California, Sycamore 8 -3919 Canada: Montreal, Quebec, Canada, Walnut 0337 PRECISION PAPER. TUBE CO. Give to 2057 H. CHARLESTON ST. CHICAGO 47, ILL. D FCISID Plant No. 2: 79 Chapel St., Hartford, Conn. AMERICAN CANCER SOCIETY Also Mfrs. of Precision Coil Bobbins

188 For product information, use inquiry card on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Structural Dielectrics TOP QUALITY (Continued from page 187) Broadcast /Communication and the physical conditions during Transmitting Components its application, and the type of cata- lyst used with the resin. By modify- Rtk ing one or more of the foregoing factors, satisfactory materials have been produced with the same glass fabrics and resins used by partici- High Power pating fabricators at no increase in Variable and cost or complexity. Fixed Inductors To insure proper control of the Pioneers in the inductor field for quality of structural dielectrics, it commercial equipment, Johnson's complete line begins with small was concluded that: wire wound units for low power stages and extends to big, high power copper tubing types. (1) A dielectric properties test simi- There's a Johnson inductor "your size' and all offer you the bene- lar to that in the antenna speci- fit of many years engineering fication should be added to the achievement and highly advanced material specification together production techniques. with revised property limit requirements. RF Contactors Designed for high voltage (2) A new accelerated service test RF switching -suitable for is needed to predict deteriora- many other applications. tion in hot, humid climates. with these rugged nylon Fast action- rugged and compact. Two sizes: 17 KV and 22 (3) The limits for tip and banana plugs! KV peak. Current: 25 amps. per' design property contact, no holding current re- materials should be based on quired. Mounts in any position. the condition immediately after Illustrated above- the simulated service tests. Johnson's new nylon insulated banana Listing of initial properties plug. Below -a cutaway view of the new should be discontinued. nylon insulated tip plug ...two of the (4) Until the factors governing toughest, most dura quality are understood, ble connectors avail- Tower better able today! Lighting Filters fabricators should institute a sampling system whereby ma- Low impedance to 60 cycle current -high impedance to terial from actual parts is con- RF. Antenna radiation re- tinuously being tested for me- sistance changed less than chanical and electrical deterio- Look at these features: 1% to comply with FCC ration. regulations. Also serves as Shock -proof nylon insulating handles -won't a static drain device when chip or crack with the hardest usage. with used grounded AC provides high voltage insulation. circuits. Three windings The current military specifications rated 10 amps. each at Highly resistant to extremes of heat, cold 60 cycles -impedance require void free construction; that and moisture. 0.3 ohms. Available for is, relatively little entrapped gas. Special design for simplified solderless con- panel mounting or in Fig. 9 shows the range of distribu- nection of up to 16 gauge stranded wire. weatherproof cabinet Economical -simple, functional engineering tion of voids in one batch of a poly- design gives you top quality at low cost. ester laminate. The tests indicated that the relative number of voids SPECIFICATIONS had no effect on the rate of deteri- BANANA PLUG -nickel -plated brass con- oration. It has been generally be- struction with nickel -silver springs. Spring plug is lieved that electrical deterioration is .175" diameter, fits all standard banana jacks. proportional to water absorbed, that TIP PLUG - recessed metal head is fully insulated, preventing exposure of metal surfaces Other Johnson Broadcast Accessories weight gain equals water absorption, when tip plug is engaged in any standard tip and that voids increase the water jack. Metal parts are brass, nickel -plated. Pin Phase Sampling Loops absorption. The test data did not is .081" diameter -fits all standard tip jacks. Isolation Inductors support any of these beliefs. Studies Available in 11 bright colors to match Johnson nylon tip jocks. Static Drain Chokes of free water content of the lami- Strain and feed -thru insulators nates were made by chemical an- 44o New alysis and was shown 7ÇP!!l Grattrear / it that after NYLON TIP JACK AND severe exposure to heat and humid- INSULATING SLEEVE Johnson manufactures a wide range of ity the free water added was less Complete assembly Includes a stand- components and equipment for broadcast original content, and ard nylon tip jock with a threaded and commercial transmitter applications. than the that nylon insulating sleeve. Ideal for A complete broadcast equipment catalog only a fractional and variable part porch cords, this assembly is also ex- is available on request -write to: of the weight gain was to free cellent for panel mounting, where on due insulated rear connection is desired. BROADCAST SALES DIVISION water. The lack of correlation between weight gain and electrical de- Investigate today! Write for prices, further information. terioration is shown by contrasting E. F. JOHNSON COMPANY the performance of the two materials E. F. JOHNSON COMPANY 225 SECOND AVE. S.W. WASECA, MINN. in the following table. The resin was 2231 SECOND AVE. S.W. WASECA, MINN.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 189 www.americanradiohistory.com Structural Dielectrics HIGHEST PRECISION (Continued from page 189) an epoxy. The two materials were made by different fabricators but in low frequency crystals were nominally identical as to in- gredients and processing. Initial conductance (1) 0.07 0.07 Conductance after ex- Precision plus, that's posure (2) 2.28 0.10 what you get with every Weight gain after ex- Reeves -Hoffman low posure, % 0.39 0.39

frequency crystal unit. For (1) \Iicromhos at 4 ac. !/fi it 6 z 5 in. sample exact control of all low (2) 200 hrs. in water at 140°F. frequencies from 12 kc to The general conclusion from this 1000 kc- specify Reeves study is that much more work is Hoffman crystals. needed to insure consistent good performance from glass fiber lami- Write today for further nates. Service environments ne- information and prices. glected in this program should be investigated. A great deal of chemical and physical experimentation is needed to trace the factors that cause some materials to deteriorate. Re- sistance to degradation should be investigated in all appropriate frequency ranges. Quality inspection procedures need to be developed. - HOFFMAN CORPORATION The results of this work should be a subsidiary of Claude Neon, toc. incorporated in the standards and specifications for raw materials so that the fabricator can depend on CHERRY AND NORTH STREETS CARLISLE, PENNSYLVANIA the products that he purchases, and can get more effective control in his processing. When you want it MAY NEW PRODUCT

ENGINEERING THYRATRON NL -5560, a new thyraton, is expected use a COMPANY to be of considerable interest to main- STEPHENS tenance engineers and users of electronic control equipment. Mercury - MICROPHONE vapor filled for longer life, it uses an Word for word, sound for eaptacettev indirectly heated cathode, shield grid. sound, a Stephens condenser The ratings on this tube are: Heater microphone picks up with un- volts, 5 v; heater current, 4.5 amps; peak faltering accuracy throughout Et9teez4 the entire dynamic range. Whether a low soft whisper, DEDICATED TO full choir, or loud brass band, a Stephens mike "can take it ". WESTERN That's why Stephens is ideal for single mike installations EXPANSION be it a full symphony or a solo artist. Preferred too, because, although highly sensitive, its rugged construction with- INDUSTRIAL AND stands severe shock without going out of service. Stephens microphones are COMMERCIAL used by M -G -M Studios for all music recording. CONSTRUCTION MICROPHONES SPEAKERS DESIGN inverse and forward volts 1000; average tp 0 TPH ENS II lb, ! anode current, 2.5 amps; peak anode current, 15 amps; anode averaging time, 15 sec; and cathode heating time, 5 STEPHENS MANUFACTURING CORP. minutes. National Electronics, Inc., Gen- 8538 Warner Drive MAY ENGINEERING CO. H I M eva, Ill. -TELE -TECH & ELECTRONIC Culver City, California 6 0 5 5 LANKER 5 BOULEVARD NORTH HOLLYWOOD. CALIFORNIA INDUSTRIES (Ask for 8 -48)

190 For product information, use inquiry cord on la t page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Stacked Tubes Americas most (Continued from page 93) which is placed alongside for com- complete line parison. Side and top views of the new ceramic tube appear in the photograph, indicating that the cer- PRECISION QUALITY amic tube has the shape of a simple flat cylinder. Terminal lugs project components OF TUNGSTEN, MOLY, NICKEL CLAD WIRE, ALLOYS, KOVAR

ef.,616.7.174le ROTARY POWER IS BEST The "clop- clop" of "Old Bess" gave Grandma's buggy ride more vibration thon the smooth Rotary Power of today's modern au- tomobiles. ROTARY POWER is best for mobile radio, too and for all DC to AC conversion .. smoother . .. more dependable. Quality controlled throughout production DC TO AC CONVERTERS with Tungsten leads produced under General Electric Timing Control. Each For operating tape r tungsten lead is microspecially in- corders, dictating machines, amplifiers and for DKE spected flaws. offers highest other 110 -volt radio - quality and LOW PRICES now. Send audio devices from DC or storage batteries. Used drawings for quotations and let us by broadcast studios, program producers, executives, salesmen and other "field workers ". prove the economy of our prices. DUO -VOLT GENFMOTORS

The preferred power supply for 2 -way mobile rodio istallations. Operates from either 6 or 12 -volt batteries. Carter Gene - motors are standard equipment in leading makes of auto, aircraft, railroad, utility and marine communications.

CHANGE -A -VOLT DYNAMOTORS

Fig. 8: Stacked assembly of double triode Operates 6 -volt mobile radio sets from 12 -volt automobile batteries ... also from 24, 32 and 64 -volt battery power. One of many Carter Dynamo- tor models. Mode by the world's largest, exclusive man- The Engineering ufacturer of rotary power sup Company can give you plies. immediate delivery on following BE SAFE . - . BE SURE . . . BE SATISFIED bases: 50 Watt, 3303B, 412 Indus- AC can be produced by revers- trial Base, Giant 7 Pin Bayonet, 4310 ing the flow of DC, like throw- ing o switch 120 times a sec- Four Pin Jumbo, Tetrode, Hydrogen ond. But ROTARY converters Thrytron Bases in both Aluminum and actually generate AC voltage Copper up to 6.50 dia etc. All bases from an alternator, same os to JAN -1A /MIL -E -1B and subjected to utility stations. That is why ROTARY power is such clean weights and strength tests. AC, so dependable .. essential for hash -free operation of recorders from DC power. A WORD OF THANKS SEE Carter products at the WESCON Show, Boo:h 327, Civic Auditorium, San Francisco, TO OUR Aug. 24 -26. Or MAIL COUPON for il- WEST COAST FRIENDS! lusrored literature. Carter Motor Co. Chi- Western consumers of DKE components Fig. 9: Ceramic -metal assembly of double diode -_-I can be assured of our continued efforts to CARTER MOTOR CO. provide top quality at lowest prices and 2654 N. Maplewood Ave Chicago 47, Illinois service that meets your assembly line 1 schedules! v I radially so that the tube may be Please send illustrated literature containing c m -I plete information on Carter "Custom" Con -1 soldered or wired directly into a verters and Dynamotor Pcwe, Supplies

circuit as would a condenser or re- NAME I THE engineering CO. sistor. While the ceramic tube is Address quite small, having a diameter of 27 WRIGHT ST., NEWARK 5, N.J. City State s only 7/8 in., nevertheless, it has a

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on last page. 191 www.americanradiohistory.com Stacked Tubes DIRECTIONAL (Continued from page 191) there' a cathode area larger than that of the 6SN7. Fig. 7 is an enlarged sectional BETTER drawing of the tube illustrating the stacked structure comprising cer- WAY... ANTENNA amic and metal rings sandwiched AMCI Type 1030 and brazed together. The tube is essentially of planar electrode construction, the disk -like cathode and grid electrodes being supported from the metal side wall rings. Cop- per end walls on the envelope provide the anodes. Conical formation of the electrode supports insures maximum rigidity, and nested parts provide a compact structure. Fig. 8 shows exploded views of the double triode, the left -hand view in the phctograph showing parts completely exploded and the right -hand illustrating the subassemblies prior

use BIRTCHER KOOL KLAMPS! .-... f .awi

KOOL KLAMPS will help keep your miniature and subminiature tubes COOL - and will hold them firm and secure, no matter how they are shaken or vibrated. KOOL KLAMPS are made of a specially developed heat- treatable alloy 991/2% pure Similar to the Type 1040 Slotted - ring Antenna, out with pattern silver. They combine high ther- shaping members connected to mal conductivity with great alternate active rings, the Type 1030 provides a controlled pat- strength - in a one -piece unit. tern adjustable to service requirements. Pattern and antenna No need for special "inserts" shown are of WéAT -TV, Channel which slow up installation and 12, west Palm Beach, Florida. Easy installation is an important Fig. 10: Stacked tubes soldered In rlrcults make maintenance difficult. advantage of the type 1080 An- tenna. This lightweight, yet KOOL KLAMPS are available sturdy, antenna can be easily and conveniently mounted on sup- to making final seals. Each end sec- with new "independent finger" porting mast after mast has been erected. tion is a grid -anode assembly unit, construction or standard solid Ask for Bulletin T -655 and the center section is a cathode - construction. heater assembly. The components Where heat conditions are comprising each subassembly being less critical, beryllium copper later joined to make up the final KOOL KLAMPS are available. tube. The tube is processed and ANTENNA SYSTEMS - COMPONENTS SEND FOR KOOL AIR NAVIGATION AIDS - INSTRUMENTS evacuated while the subassemblies are separated in a vacuum chamber, K LAMP CATALOG TT -8-55 ALFORD after which the envelope sections are brought together and brazed before The BIRTCHER CORPORATION lop Alanujaciuring Co., Inc removal from the vacuum. 299 ATLANTIC MASS. 4371 Volley Blvd. Los Angeles 32, California AVE., BOSTON, From inspection of the individual

192 For product information, use inquiry cord on last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com components making up the tube, it is seen that maximum utilization is new VIKING made of the stacking technique. Electrode structures, as well as the pressurized envelope parts, nest together as the LOW and constant MINIATURE CONNECTORS stack is built up. Since the individual contact drop components may be precisely LOW electrical noise Note these Viking features: formed and are self -jigging vertically and axially, it is skilled HIGH seen that current FUSED BEAD pressurizing for sealing personnel are not required and that density LONG life... around contacts the tubes are ideally suited for as- MS GASKET for panel sealing sembly by automation. Such auto- POSITIVE POLARIZATION LOCKING DEVICE, simple and fool -proof

PLATED SHELL...gold over silver AUTOMATIC ALIGNMENT HIGH PERFORMANCE ACTUAL N SIZES

Hex mounting nut Lockwasher MS Gasket Seal Fused Bead Seal

Available in 2 shell s zes: BRUSHES 1 -4 CONTACTS AND 5.9 CONTACTS IKING CONTACTS E L E C T R I C DIVISION OF VIKING INDUSTRIES. INc. 21343 ROSCOE BLVD., CANOGA PARK, CALIF. SEC z0v AT THE WESCON ,HOW. BOOTH ..217. LAN ro,NciSCO SLIP RINGS & Slip Ring Assemblies Fig. 11: Double triode on circuit module Molded BRUSH HOLDERS, CONTACT ASSEMBLIES,

matic machinery is now being de- BRUSH ASSEMBLIES 11 BLACK NYLON signed. Fig. 9 shows how the tube parts SCREWS and fit together to form a double diode. The only difference here is that the NUTS two grids and two ceramic rings USED EXTENSIVELY IN have been omitted. This approach to SERVOS GUN -FIRE CONTROLS the tube making problem, utilizing TELEMETERING ROTATING tube parts which become common THERMOCOUPLE and STRAIN Insulate and to a variety of tube types, is one of fasten without GAGE CIRCUITS ROTATING bushings, washers, etc. the important advantages of the In stock 6 -32, 8 -32, 10 -32 stacked structure. JOINTS DYNAMOTORS Fig. 10 illustrates the double triode Wide range of grades available for standard and double diode tubes soldered and special applications. Call on our 40 years of into typical circuits. The double design experience to help solve your problems. diode at the left in the photograph OTHER GRAPHALLOY has one section operating as a recti- PRODUCTS: Unique (oil - free) If- lubricating Bushings fier and the other section function- and Bearings (applicable -450 " BLACK to +700F.- with co- ing as a limiter diode. The double efficient half that of steel will not seise shaft at low temperature); triode at the right is operating as Oil free Piston Rings, Seal Rings, NyGrip NYLON Thrust and Friction Washers, a two -stage low frequency amplifier Pump Vones. Cable Clips such as used in servo -mechanisms. Fig. 11 shows the double triode GRAPHITE METALLIZING CORPORATIONA TION mounted on a module, the latter 1002 Nepperhan Ave. YONKERS, NEW Light -weight being a circuit assembly unit pro- YORK non- condicting U Neese tend daft en Graphalley BUSHES end CONTACTS. support for wiring, tubing, etc. duced by automation programs such Send den en BUSHINGS. In stock 'iu" to 11/2" dia. as Tinkertoy. These stacked ceramic tubes are ideally suited for combina- NAME f TITTE tion with such circuit module units. COMPANY WECKESSER CO. STREET at the National Conference on CITY 5259 N. A. ondo!e Avenue Cnko9a 70, Ilfinoi, (Presented ZONE STATT .., Aeronautical Electronics, May, 1955.)

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 For product information, use inquiry card on lost page. 193 www.americanradiohistory.com 17 AN INDUSTRY 1 I DO YOU HAVE LIGHTING NEWS OBSTRUCTION PROBLEM? i Your Hest INC. i & PHILLIPS, HUGHEY source of Richard Hodgson was elected vice pres- mus t dependable _ Lighting Equipment. i: ent of Fairchild Camera & Instrument Obstruction of Control widest selection Corp., it was announced by Sherman M. the in the industry. _ Apparatus Fairchild, Chairman of the Board. Alarm

MODEL LC52 -9AP Photo. electric control H. J. Buehler R. Hodgson Tower Lighting (2 or 3 pole) Control Unit Remote Phototube, was named (Outdoor type) Two -Circuit Flasher and Herbert J. Buehler recently Aulotransformers. FOR RELIABLE ASSISTANCE WITH as General Manager of Rutherford Elec- SOLDER AND FLUX tronics Co., Culver City, Calif. This MANY OTHER MODELS AVAILABLE newly created post was established to Write for literature on your specific problem PROBLEMS meet the increasing growth of the company's activities. r- HUGHEY & PHILLIPS, INC. -, Manufacturers of Leon T. Eliel has been elected to the 300MM Code Beacons, Obstruction Lights, Photo-Electric Controls, Beacon Flashers, Board of Directors of Fairchild Camera Microwave Tower Control 8 Alarm Units and Instrument Corp. Mr. Eliel is Pres- Remote Lamp Failure Indicator Systems, and Complete Tower Lighting Kits. ident of Fairchild Aerial Surveys, Inc , a subsidiary of Fairchild Camera. I 3300 NORTH SAN FERNANDO BLVD. I L. BURBANK, CALIF. J Jack L. Hobby, of Weston, Mass., has SEE AN MAN been named manager of publicity and institutional advertising for Raytheon "INDUSTRIAL" Mfg. Co., Waltham, Mass. Mr. Hobby came to Raytheon more than four years ago as Staff Asst for Public Relations. a highly trained field SPECIALIST Jerry S. Frank has been appointed by ALWAYS available in YOUR the Telautograph Corp. to direct the company's recently expanded sales, TERRITORY to give you service, and advertising program. The general sales and service offices have QUALIFIED ASSISTANCE. been moved to Los Angeles. ALPHA METALS, INC. James L. Caddigan has been appointed of 53 Water St., Jersey City, N.J. to the newly created post director of "Electronicam" marketing for Allen SUBMINIATURE B. DuMont Laboratories, Inc. His new AND TRANSISTOR QUALITY CONTROLLED PRODUCTS duties will be performed at the com- BY SPECIALISTS in Solders. Fluxes. Tin pany's main office, 750 Bloomfield Ave., Sockets... 8 Lead Products FOR OVER 50 YEARS. Clifton, N.J. Manufactured to RETMA standards for commercial and military applications. des Insulation ... Low-loss mica filled phenolic. hie rz7GrlcriGClcr.iPte 0f Harrison Johnston, recently elected as SOLDER an officer of Ampex Corp., has since Contacts ... Beryllium copper. Plating ... Silver coated. Other finishes been made director of Ampex Inter- available. ®CEN- TRI -(ORE national, newly formed division of Am- Novel Chamfer design at the top surfaces allows pex. Mr. Johnston joined Ampex as easy insertion of delicate tube or transistor ROSIN leads. ENERGIZED OR PLASTIC sales manager in 1951. Generous tail spacing, laterally, provides ample ROSIN- FILLED soldering room and greater protection against J. Trevor Downer has been appointed shorts. Can be supplied with retaining rings. West Coast Sales Manager by Chatam Our extensive design and production Electronics, a division of Gera Corp., facilities are available for develop- SOLDER and SG- Livingston, N.J. ing your special requirements solder applications. Representatives in prin- non-corrosive cipal cities throughout U.S.A. that is guaranteed Write for samples and information. against rosin New Transistor Plant voids or skips Ground was broken recently for INDUSTRIAL HARDWARE Motorola's new one and one -half mil- Manufacturing Company, Inc. l lion dollar transistor manufacturing YORK 12,N.Y. facility in Phoenix, Arizona. 109 PRINCE ST.,NEW

194 For product information, use inquiry tard -on .last page. TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com TELE -TECH ADVERTISERS - AUGUST, 1955 133 ACE ENGINEERING & MACHINE CO., INC. 64 GABRIEL ELECTRONICS DIV., GABRIEL CO. I 54 PHILCO CORP. Co. Inc. Agency P. Bridge Co. Agency- Engineered Advertising Agency -Hutchins Advertising -Harry 39, 135 ACME ELECTRIC COii ?. 128 GATES RADIO CO. 65 POLARAD ELECTRONICS CORP. 38, Inc. Agency Advertising Agency Agency- Howard A. Hor.avy, Inc. Agency -Scheel Advertising Agency -Bartz 157 AEROVOX CORP. 50 GENERAL CERAMICS CORP. 15 POLYTECHNIC RES. & DEV. CO., INC. Staff Agency -George Homer Martin Assoc. Agency -George Homer Martin Assoc. Agency -Austin C. Lescarboura & 188 AIRCRAFT RADIO CORP. 60 GENERAL PRECISION EQUIP. CORP. PRECISION PAPER TUBE CO. Agency Dowling Adams, Inc. Section 2, pp. 2, 3 Agency- Symonds, MacKenzie & Co. Inc. -Burke 121 PRODUCTS 150 Agency -Geer, DuBois & Co.. Inc. PRESTO RECORDING CORP. ALDEN CO. Inc. Agency- Richard Thorndike Agency GENERAL PRECISION LAB., INC. 14 Agency -Lewin, Williams & Saylor, ALFORD MANUrACTURING CO., INC. I 92 Agency -Burke Dowling Adams, Inc. PYRAMID ELECTRIC CO. 46 Advertising GENERAL PRECISION LAB., INC. 113 Agency- Burton Browne Advertising Agency- Engineered 22, 23, Cover 4 ALPHA METALS, INC. 194 Agency-Geer, DuBois & Co., Inc. RADA) CORP. Or AMERICA GENERAL RADIO CO. 57 Agency -AI Poui Lefton Co. Agency-Jules Wagner Advertising Cover 2 AMERICAN LAVA CORP. 29 Agency -K. E. Morang Co. RADIO MATERIALS CORP. Advertising GERTSCH PRODUCTS, INC. 164 Agency -Turner Advertising Co. Agency -Power & Condon 11, 127 AMERICAN PHENOLIC CORP. 58 Agency -Don Larson Advertising RAYTHEON MANUFACTURING CO. Browne Advertising GLOBE INDUSTRIES, INC. 183 Agency- Donahue & Coe, Inc. Agency -Burton 4, 5 ANCHOR INDUSTRIAL CO., INC. 175 Agency -Weber, Geiger & Kolar, Inc. RAYTHEON MANUrACTURING COMPANY ... GRANT PULLEY A HARDWARE CO. 175 Agency -Walter B. Snow & Staff, Inc. Agency -Richard & Gunther Inc. 177 ANDREW CORP. 55 Agency- Jomian Advertising Publicity, Inc. REEVES EQUIPMENT CORP. GRAPHITE METALLIZING CORP. 193 Agency-Gal longs Advertising Agency -Frank C. Nahser, Inc. 190 APEX COATED FABRICS CO., INC. 173 Agency -Kotula Co. REEVES- HOFFMAN CORP. Advertising GUDEBROD BROS. SILK CO., INC. 178 Agency-W. H. Long Co. Inc. Agency-Hart- Lehman 139 ARNOLD ENGINEERING CO. 56 Agency-Lee Ramsdell & Co., Inc. REEVES SOUNDCRAci CORP. & Downing, General Agencv HEIDENREICH CO. 187 Agen. y -G. M. Basford Co. Agency- Wolker 181 ATLANTIC TRANSFORMER DIV. NEW LONDON HELIPOT COE.P ROSEN ENGINEERING PRODS., INC., R. INSTRUMENT 178 Agency -Darwin H. Clork Co. Agency -AI Paul Lefton Co. Inc. CO., INC. 183 Agency-Henry A. Loudon Advertising Inc. HETHERINGTON, INC. 163 RUST INDUSTRIAL CO., INC. 41 Agency--Harry P. Bridge Co. Agency -Weston Advertising AUDIO DEVICES, INC. 182 Rickard, & Reed, Inc. HOFFMAN LABORATORIES, INC. 43 SAN FERNANDO ELECTRIC MFG. CO. Agency-Morsteller, Gebhardt 142 BARRY ELECTRONICS CORP, 178 Agency-Anderson. McConneli A:v. Agency SHALLCROSS MANUFACTURING CO. Adrian HOUSTON FEARLESS DIV. CO' -OR CORP. Agency -Harry P. Bridge Co. Agency- Clark, Jr. 34 BERNDT -BACH, INC. 126 OF AMERICA 28, 185 SHURE BROTHERS, INC. Agency- Abbott Kimball Co. of Inc. Agency & Young, Inc. Agency -Strol Advertising Co California, -Taggort 161 BIRD ELECTRONICS CORP. 172 HOWARD INDUSTRIES, INC. 19 SOLAR MANUFACTURING CO BIRTCHER 192 Agency -R. M. Loeff Advertising Inc. Agency -Allen, Dorsey & Hatfield Inc. CORP. 68 Agency- Guerin, Johnstone, Jeffries Inc. HUGHES AIRCRAFT CO. 141 SPRAGUE ELECTRIC CO. BOMAC LABORATORIES, INC. Cover 3 Agency -Foote, Cone & Belding Agency -Harry P. Bridge Co. 8 Agency- Lorcom Randall Advertising HUGHES RESEARCH & DEVELOPMENT LABS. 167 SPRAGUE ELECTRIC CO. BOURNS 44 Agency- Foote, Cone & Belding Agency -Stuart Sande Advertising LABORATORIES 35 Agency -McCarty Co. Advertising HUGHEY & PHILLIPS, INC, 194 STACKPOLE CARBON CO. Agency Hollander & Coleman Agency -Harry P. Bridge Co. BRADLEY LABORATORIES, INC. 6 -Welsh, 190 Agency -. Chorles Brunelle Co. HYCON MANUFACTURING CO. 169 STEPHENS MANUFACTURING CORP. B -ES, 186 Agency -Hinson & Jorgensen, Inc. Agency -Leech Advertising Co. UR.:E & JAM INC. 185 Agency- William Fu,terman Adv. HYCOR COMPANY, INC. 147 SWITCHCRAFT, INC. 11'C. 18 Agency Dorsey & Hatfield Inc. Agonry- Jacobson & Tonne Advertising BURNELL & CO.. 17, -Allen, 148 Agency -Hicks & Greist, Inc. INDUSTRIAL HARDWARE MFG. CO., INC. 194 SYLVANIA ELECTRIC PRODUCTS INC. Agency-Bergman Advertising Agency, Inc. Agency- Deutsch & Shea Advertising B URROUGHS CORP., ELECTRONIC 119 INSTR. DIV. 152, 153 INTERNATIONAL RECTIFIER CORP. 45 SYLVANIA ELECTRIC PRODUCTS INC. Agency & Rogers Agency -Western Advertising Agency, Inc. Agency -1. Wolter Thompson Co. -Gray 16 BUSSMANN MANUFACTURING CO. 36 INTERNATIONAL RESISTANCE CO. 146 SYNTHANE CORP. CALDWELL -CLEMENTS, INC. 158 Agency-Arndt, Preston, Chapin, Lomb & Keen, Inc. Agency -Arndt, Preston, Chapin, Lamb & Keen, Inc. CAMERA EQUIPMENT CO. 7 IRCAL INDUSTRIES 147 SYNTRONIC INSTRUMENTS, INC. 176 Agency Preston, Chapin, Lomb & Keen, Inc. Agency- Burton Browne Advertising Agency -1. M. Kesslinger & Assoc. -Arndt, 128 CANNON ELECTRIC CO. 66 JOHNSON CO., E. F. 189 TARC ELECTRONICS INC. Agency & Co. Agency -Firestone- Goodman Adv. Agency, Inc. Agency- Hoydon Co., Inc. -Willard G. Gregory 53 CANOGA CORP. 124 JONES DIV., HOWARD B., CINCH MFG. CORP. 188 TECHNOLOGY INSTRUMENT CORP. . Facing 50, Agency-Elmer W. Ayer Advertising Agency- Symonds, MacKenzie & Co. Agency- Tipoett & Co., Inc. CARTER MOTOR CO. 191 KAHLE ENGINEERING, INC. 186 TEKTRONIX, INC. 26 Robert Peterson Agency-Conti Advertising Agency, Inc. Agency -Hugh Dwight Advertising Agency- Advertising 151 CHATHAM ELECTRONICS 33 KAY ELECTRIC COMPANY 183 TENSOLITE INSULATED WIRE CO., INC. Assoc. Agency- Homer Martin Assoc. Agency- Josephson, Gulick & CuBari Agency- George Homer Martin George 62 CHICAGO TELEPHONE SUPPLY CORP. 131 KEARFOTT CO., INC. Section 2, p. 5 TEXAS INSTRUMENTS INCORPORATED Agency -Burton Browne Advertising Agency -E. M. Freystodt Assoc., Inc. Agency -Don L. Baxter, Inc. CORP. 111 KEARFOTT CO., INC. 171 THERMADOR ELECTRICAL MFG. CO. (A DIV. CINCH MANUFACTURING 118 Agency-D. T. Campbell Inc. Agency- Western Advertising Agency, Inc. OF NORRIS THERMADOR CORP./ 179 & CO., D. S. 156 Agency- West Marquis, Inc. CINEMA ENGINEERING CO. KENNEDY 47 Agency-R. L. Power Agency- Larcom Randall Advertising TINNERMAN PRODUCTS, INC. 67 49 Agency -- Meldrum & Fewsmit h, Inc CLEVELAND CONTAINER CO. KESTER SOLDER CO. 196 Agency -Nesbitt Service Co. Agency -Paul J. Steffen Co. TOWER CONSTRUCTION CO. CONDENSER PRODS. DIV. NEW HAVEN & SONS, MATHIAS 134 Agency- Amundson- Bolstei n, Inc. KLEIN 172 CLOCK & WATCH CO. 174 Agency -Buchen Co. TRANSRADIO LIMITED Langeler Advertising Agency Inc. INSTRUMENT CORP. 2 Agency- Reynell & Son Ltd. Agency- KOLLSMAN 130 CONTINENTAL CARBON, INC. 170 Anency- Schaefer & Favre, Advertising TRIAD TRANSFORMER CORP. Agency -Nicholas Masso Adv. Agency KULKA ELECTRIC MFG. CO., INC. 177 Agency -Mann Advertising Co., Inc. 53 CORNING GLASS WORKS 179 Agency -L. D. Blehor, Co. TRUSCON STEEL DIV. REPUBLIC STEEL CORP. Agency-Charles L. Rumrill & Co., Inc. LAMBDA -PACIFIC ENGINEERING, INC. 40 Agency -Meldrum & Fewsmith, Inc. 185 CUNNINGHAM. SON & CO., INC., JAMES 182 Agency -California Advertising Agency U. M. & F. MANUFACTURING CORP. Agency- Hutchins Advertising Co. Inc. LIBRASCOPE, INC. Section 2, p. 7 Agency -Don Larson Advertising DAGE ELECTRIC CO. 184 Agency- Advertising Agency, Inc. UNION SWITCH & SIGNAL DIV. Western 165 Agency -Jim Bradford Adv. Agency LOCKHEED AIRCRAFT CORP. 59 WESTINGHOUSE AIR BRAKE CO. DALE PRODUCTS INC. 164 Agency -Hal Stebbins Inc. Agency -Batten, Barton, Durstine & Osborn Inc. Agency-Ayres, Swanson & Assoc., Inc. LORAL ELECTRONICS CORP. 13 U. S. COMPONENTS, INC. 173 DAYSTROM PACIFIC CORP. 129 Agency Richard A Gunther Inc. Agency- Jarrett Advertising Agency, Inc. -- 149 Agency -P. W. Voorhees -Advertising MAGNETICS, INC. 54 U. S. ENGINEERING CO., INC. 155 Advertising Agency Agency -O. K. Fagan Advertising Agency DETECTRON CORP. Agency-Lando 24 Agency G. Willis & Assoc. MALLORY & CO., INC., P. R. 42 UNITED TRANSFORMER CO. -Harry Inc. DIAMOND MANUFACTURING CORP. 180 Agencv- Aitkin.Kynett Co. Agency -Shappe, Wilkes, Gilbert & Groden, Agency- Robert Hartwell Gabine MAY ENGINEERING CO. 190 UNITEK CORP. 132 DIAMOND MICROWAVE CORP. 181 McALISTER INC., J. G. 143 Agency- Allen, Dorsey & Hatfield Inc. 160 Agency- Robert Hartwell Gabine Agency -Tilds & Contz Advertising VARFLEX CORP. EITEL-McCULLOUGH, INC. 136, 145 McMILLAN INDUSTRIAL CORP. 117 Agency -Barlow Advertising Agency, Inc. Anency- Conner, Jackson, Walker, McClure Anency -Robert Hortwell Gabine VARIAN ASSOCIATES 21 ELECTRA MANUFACTURING CO. 159 MELPAR, INC. 187 Agency -Boland Associates Agency- Valentine- Radford Advertising Agency -Equity Advertising Agency VICTOREEN INSTRUMENT CO. 162 Agency Advertising Agency Inc. ELECTRICAL INDUSTRIES DIV. OF MILLIVAC INSTRUMENT CORP. 138 -Scheel 193 ELECTRIC CO. AMPEREX ELECTRONICS CORP. 63 MOTOROLA, INC. 176 VIKING Agency -Western Advertising Agency, Inc. Agency- George Homer Martin Assoc. Agency -Kolb & Abraham Advertising 48 WATERMAN PRODUCTS CO. 120 ELECTRONIC FABRICATORS, INC. 37 NATIONAL VULCANIZED FIBRE CO. Anency- Hnrris D. McKinney Inc. Agency -Abner J. Gelula & Assoc., Inc. Agency -Hicks & Greist, Inc. 193 NEELY ENTERPRISES 31 WECKESSER CO. ELECTRO- PULSE, INC. 174 Advertising Agency, Inc. WESTERN GEAR WORKS 124, 125 ENGINEERING Agency- Western CO. 191 NEW LONDON INSTRUMENT CO., INC.. Agency- Ruthrauff & Ryan Inc. Agency- Assoc. 115 George Homer Martin AMERICAN EASTERN ELECTRONICS DIV. 187 WESTON ELECTRICAL INSTRUMENT CORP. ... FACTORY ENTERPRISES, INC. 179 Anency -Henry A. Loudon Advertising, Inc. Agency -G. M. Bosford Co. FAIRCHILD CONTROLS CORP 20 NEW LONDON INSTRUMENT CO., INC. 182, 185 WIEDEMANN MACHINE CO. 177 Agency -G. M. Bosford Co. Agency A. Loudon Advertising, Inc. Anency- Renner Advertisers -Henry 188 FAIRCHILD ENGINE & AIRPLANE CORP. 144 NORTH ELECTRIC MANUFACTURING CO. 168 ZERO MANUFACTURING CO. Agency- Gaynor & Co., Inc. Agencv- Cnrpenter Advertising Co. Agency -Edward S. Kellogg Co. FEDERAL TELEPHONE & RADIO CO. 27, 184 N. R. K. MFG. & ENGINEERING CO. . 180 Agency -J. M. Mathes, Inc. Anencv- Kreicker & Meloan, Inc. FORD INSTRUMENT CO. 166 OSTER MANUFACTURING CO., JOHN 61 While every precaution is taken to Insure accuracy, Agency -G. M. Bosford Co. Anency- Rurton Browne Advertising we cannot guarantee against the possibility of an FREED TRANSFORMER CO., INC. 196 PANORAMIC RADIO PRODUCTS, INC. 140 tonal change or omission in the preparation Agency -Franklin Advertising Agency Aae. -v- Harold Marshall Adv. Co., Inc. of this Index.

TELE -TECH & ELECTRONIC INDUSTRIES August 1955 195 www.americanradiohistory.com 4 New FREED ENGINEERED TEST INSTRUMENT TYPE 1670 "DC" NULL DETECTOR . . . through Amok EXPERIENCE

Dr. P. S. Christaldi has been ap- to Fit Your Needs pointed to head the new Technical Products Division of Allen B. Du Mont Labs, Inc., Dr. Christaldi has been associated with Du Mont since 1938.

Station WOAY.TV is an ex. USES ample of how TOWER'S engin. This instrument is designed to give rugged performance while still maintaining the excellent eering and experience can solve sensitivity of a galvanometer. It is extremely your unusual tower problems. useful as o null indicator giving instantaneous polarity indication in any type of DC bridge This 600 ft. tower supports an measurements. It will find particular application in strain measurement, pyrometry, conductivity 83 It. TV antenna, an FM antan and insulation testing, flow measurement and null detection. na, an 8 ft. x 12 ft. Microwave DESCRIPTIONS Passive Reflector, and serves as The instrument consists of ,o filter in the input an AM radiator. From coast to circuit, a chopper and a high gain AC amplifier. The sensitivity of the instrument without the filter coast you'll find installations is greater than 10 microvolts per division with where TOWER'S "know how" an input impedance of 1 megohm. The filter P. S. Christaldi W. Hotine when used suppresses any 60 cycle pickup by has paid off. more than 50db and reduces the sensitivity to 100 microvolts per division. Bill Hotine, a relay and electronic SPECIFICATIONS engineer from Bayville, L. I., has been Input Impedance - 1 megohm. employed to manage research and de- Null Detector Sensitivity - 10 microvolts per division without filter. 100 microvolts with filter. velopment on new products for Assem- Scale - 4" zero center. bly Products of Calif., a new subsidiary MICROWAVE Power Supply - 115 volts, 50-60 cycles. of Assembly Products, Inc., Chesterland, Dimensions - 8V z" z 10" z 1l Ohio, manufacturers of contact meter - relays. Prior to this position, Mr. Hotine TOWERS has for several years done product de- FREED TYPE 1010A sign on instruments and controls for and REFLECTORS COMPARISON & automation in industry. Dr. Harris M. Sullivan has been LIMIT BRIDGE named manager of the Electronics Lab- oratory at G.E. Co.'s Electronics Park in Syracuse, N. Y. Previously, he was vice -president of Central Scientific Co., Chicago, in charge of research and engineering. R. J. Krause has been appointed to the newly -created post of Chief Admin- istrative Engineer at Pacific Division, Bendix Aviation Corp., No. Hollywood, Calif. Pioneers in Microwave towers Gerald C. Schutz has been ap- and reflectors, TOWER Micro. pointed Director of Electronics of the wave Passive Reflectors are Gruen Watch Co. Mr. Edward H. Weit- USES used by the U. S. Government, For laboratory and production testing of resistors, zen president of the company, an- Bell Telephone System and lead. condensers and inductors. Instrument is com- nounced the appointment. Mr. Schutz pletely self contained and A.C. operated. was formerly associated with the Gibbs ing manufacturers. For strength, DESCRIPTION Manufacturing and Research Corp. as dependability and service . , , The instrument is composed of an oscillator, a bridge and a selective amplifier. Director of Electronics. you can ccunt on TOWER. SPECIFICATIONS Edwin H. Chapin has been appointed Frequency: 50 or 60 cycles, 1000 cycles and as Director of Quality Control, Triad 10,000 cycles. Transformer Corp., Venice, Calif. Mr. Range: two comparison ranges, 5% and 20%. Chapin was formerly Superintendent, Accuracy ±0.1% in the 5% position. Transformer Div., Sangamo Electric Co., Voltage applied to the Unknown: Two controls Marion, Ill., and Ass't Chief Engineer, %wez '744f:[eataza are provided to vary the voltage across the unknown. A spatial low impedance winding is used Radio Condenser Co, Watseka, Ill. "bid (,Joaae4ueeata when measuring small impedances and the volt- John B. Cicchetti and Thomas A. Ful- age across these may be varied from .1 to 1 volts. For higher values of impedance the volt- shaw have become members of the %lce ZUoald Ovvs age may be vuried from .5 to 15 volts. technical staff of the Microwave Labor- Power Supply: 105 -125 volts; 50 -60 cycles. atory, Hughes Research and Develop- Dimensions: 10'/2" x 12" x 12 ". Net Weight: Dr. Cicchetti 17 lbs. ment, Culver City, Calif. was formerly associated with the Micro- Send for Complete Catalog describing all Freed Instruments and Transformers wave Research Institute. Hoddy Nakamura and Britton T. Vin- TOWER cent, Jr. have joined the technical staff Construction Co. of the Systems Division, Hughes Re- TRANSFORMER CO., INC. search and Development, Culver City, SIOUX CITY, IOWA 1726 Weirfield St. Calif. Mr. Nakamura was formerly associated with Douglas Aircraft Co. Brooklyn (Ridgewood) 27, N. Y. immomitio 196 (210 total pages in this issue) TELE -TECH & ELECTRONIC INDUSTRIES August 1955 www.americanradiohistory.com Do YOU WANT more information? ... ABOUT PRODUCTS ADVERTISED IN Use the convenient postage -free cards below to get information on products listed here and TELE on next page -all advertised in this issue. The -TECH c Electronic Industries extra card is for the use of pass -on readers.

201 Ace Engineering & Machine Co., Inc. -R -F enclosures 245 Diamond Microwave Corp.-Microwave components 202 Acme Electric Corp. -Encapsulated transformers 247 Eitel- McCullough, Inc. Vacuum rectifiers 203 Aerovox Corp. -Disk capacitors - 248 Eitel- McCullough, Inc.-Transmitting tubes 204 Aircraft Radio Corp. -Test equipment 249 Electra Manufacturing Co.- Deposited carbon resistors 205 Alden Products Co.- Recording equipment 250 Electrical Industries Div. of Amperex Electronics Corp.- Hermetic 206 Alford Mfg. Co., Inc. -Directional antenna seals 207 Alpha Metals, Inc. -Solder 251 Electronic Fabricators, Inc.- Capacitors 208 American Lava Corp.- Ceramics 252 Electro- Pulse, Inc. -Pulse generator 209 American Phenolic Corp. -Connectors 253 Engineering Co. -Tube bases and lead in wires 210 Anchor Industrial Co., Inc. -Insulators 254 Factory Enterprises, Inc. -Wire cloth 211 Andrew Corp. -Antennas 255 Fairchild Controls Corp.- Precision potentiometers 212 Apex Coated Fabrics Co., Inc. -Coated fabrics 256 Fairchild Engine G. Airplane Corp.-Transistor analyzer 213 Arnold Engineering Co.- Magnetic materials 257 Federal Telephone & Radio Co.- Transformers 214 Atlantic Transformer Div. -Transformers 258 Federal Telephone & Radio Co.- Coaxial cables 215 Audio Devices, Inc. -Magnetic tape 259 Ford Instrument Co.- Integrator 215A Barry Electronics Corp. -Electronic tubes wanted 260 Freed Transformer Co., Inc. -Test equipment 216 Berndt -Bach, Inc. -Sound -on -film recorder 261 Gabriel Electronics Div., Gabriel Co.- Parabolic antennas 217 Bird Electronics Corp.-Directional wattmeter 262 Gates Radio Co.- Broadcast transmitters 218 Birtcher Corp. -Tube clamps 263 General Ceramics Corp.- Threaded tuning cores 219 Bomac Laboratories, Inc. -Reversible silicon diodes 264 General Precision Equip. Corp. -Electronic components 220 Bourns Laboratories- Potentiometers 265 General Precision Lab., Inc.-Color film chain 221 Bradley Laboratories, Inc.- Selenium rectifiers 265A General Precision Lab., Inc.- Navigational instrument 222 Burke & James, Inc. -Film processing 266 General Radio Co. -Test equipment 223 Burnell & Co., Inc. -Filters 267 Gertsch Products, Inc.- Standard ratio transformer 224 Burroughs Corp.-Pulse units 268 Globe Industries, Inc.- Motors 225 Burroughs Corp. -Digital & pulse devices 269 Grant Pulley & Hardware Co.- Industrial slides 226 Bussmann Manufacturing Co. -Fuses '270 Graphite Metallizing Corp. -Brushes & contacts 227 Camera Equipment Co.-TV camera equipment 271 Gudebrod Bros. Silk Co., Inc.- Lacing tape 228 Cannon Electric Co.-Connectors 272 Heidenreich Co.- Manufacturers' rep. 229 Canoga Corp.- Ferrite circulator 273 Helipot Corp. -Precision potentiometers 230 Carter Motor Co.- Rotary power supplies 274 Hetherington, Inc. -Snap- action switches 231 Chatham Electronics Corp. -Special purpose tubes 275 Hoffman Laboratories, Inc.- Research & development 232 Chicago Telephone Supply Corp.-Variable resistors 276 Houston Fearless Div. -Film processing 233 Cinch Manufacturing Corp.-Sockets 277 Houston Fearless Div.-Film processors 234 Cinema Engineering Co.- Instrument & control switches 278 Howard Industries, Inc. -Fractional H.P. motore 235 Cleveland Container Co.-Tubing 279 Hughes Aircraft Co.- Silicon junction diodes 236 Condenser Products Co.- Capacitors 280 Hughes Res. & Dev. Labs.- Engineering personnel 237 Continental Carbon, Inc.-Resistors 281 Hughey & Phillips, Inc. -Obstruction lighting equipment 238 Corning Glass Works-Low -power resistors 282 Hycon Mfg. Co. -Test instruments 239 Cunningham, Son & Co., James- Crossbar switch 283 Hycor Co., Inc. -Variable attenuator 240 Doge Electric Co., Inc. -Cable connectors 284 Industrial Hardware Mfg. Co., Inc. -Sockets 241 Dale Products Inc. -Resistors 285 International Rectifier Corp.-Selenium rectifiers 242 Daystrom Pacific Corp.-Precision potentiometers 286 International Resistance Co.- Electronic & Avionic components 243 Detectron Corp.-Frequency counter 287 Ircal Industries -Wire wound resistors 244 Diamond Mfg. Corp. -R -1' connectors 288 Johnson Co., E. F.-Transmitting components

Only one simple form to fill out Listings continued on next page

Write In boxes the code numbers of products for which á Write in boxes the code numbers of products for which you want information. Seo Ilst above and on next page. you want information. See list above and on next page.

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Your name Your name Your title Your title

TELE- TECH -AUGUST 1955 TELE-TECH---AUGUST 1955 CALDWELL -CLEMENTS, INC., 480 Lexington Avenue, New York 17 CALDWELL- CLEMENTS, INC., 480 Lexington Avenue, New York 17 www.americanradiohistory.com IV

Use the cards below to get it quickly through .. . TELE -TECH t. Electronic Industries

Listings continued from preceding page

289 Johnson Co.. E. F. -Nylon plugs 334 Reeves- Hoffman Corp. -Crystals 290 Jones Div., Howard B.. Cinch Mfg. Corp.-Fanning strip 335 Reeves Equipment Corp.-Recording equipment 291 Kahle Engineering Co.- Industrial machines 336 Reeves Sounderaft Corp.- Magnetic recording tape 292 Kay Electric Co.-Oscillator & generator 337 Rosen Engrg. Prods., Inc., Raymond-Building blocks 293 Kearfott Co., Inc. -Ferrite isolator 338 Rust Industrial Co., Inc.- Remote control unit - 294 Kearfott Co., Inc..- Precision systems & components 339 San Fernando Electric Mfg. Co.- Capacitors 295 Kennedy & Co.. D. S.- Antennas 340 Shallcross 311g. Co.- Ceramic switches 296 Kelter Solder Co.- Solder 341 Shure Brothers, Inc. -Recording head 297 Klein & Sons, Mathias- Pliers 342 Solar Mfg. Corp. -Ceramic capacitor 298 Holleman Instrument Corp.- Navigation & control devices 343 Sprague Electric Co.- Ceramic case capacitor 299 Kalke Electric Mfg. Co.. Inc.-Terminal blocks 344 Sprague Electric Co.- Wirewound resistor 300 Lambda -Pacific Engineering, Inc. -Link circuit 345 Stackpole Carbon Co.- Electric & electronic equipment 301 Librascope, Inc. -Computers, controls. components 346 Stephens Mfg. Corp. -Microphone 302 Lockheed Aircraft Corp. -Research & development 347 Switchcraft, Inc. -Push button switch 903 Loral Electronics Corp.- Position indicator 318 Sylvania Electric Products Inc.- Transistor 304 Magnetics. Inc. -Tape wound cores 349 Sylvania Electric Products Inc. -Engineering personnel 305 Mallory & Co., Inc., P. R.- Printed circuit capacitors 350 Synthane Corp. -Laminated plastics 306 May Engineering Co.-Consulting engineers 351 Syntronic Instruments, Inc. -Yokes & focus coils 307 McAlister Inc., J. G.- Lighting equipment 352 Tare Electronics Inc. -Stabilizing amplifier 308 McMillan Industrial Corp. -Free space units 253 Technology Instrument Corp. -VTVM 309 Melpar, Inc. -Engineering personnel 354 Tektronix, Inc. -Characteristic curve tracer 310 Millivac Instrument Corp. -VTVM 355 Tensolite Insulated Wire Co., Inc. -Wire & cable 311 Motorola, Inc.-Engineering personnel 356 Texas Instruments Incorporated-Transistors 312 National Vulcanized Fibre Co.- Copper -clad phenolite 357 Thermador Electrical Mfg. Co.- Transformers 313 Neely Enterprises- Manufacturers' rep. 355 Tinnerman Products, Inc. -Speed clips 314 New London Instrument Co., Inc., American Eastern Electronics 359 Tower Construction Co.- Towers Div.-Engineering service 360 Transradio Ltd. -Coaxial connectors 315 New London Instrument Co., Inc. -Noise source 361 Triad Transformer Corp.-Transformers & reactors 316 New London Instrument Co., Inc.- Frequency standard 362 Truscon Steel Div. Republic Steel Corp. -Towers 317 North Electric Mfg. Co.- Rotary switch 363 U. M. & F. Mfg. Corp. -Breadboarding 318 & & N.R.K. Mfg. Engrg. Co.-Precision instruments components 364 Union Switch & Signal Div. -Selenium rectifiers 319 Oster Mfg. Co., John -P. M. motor 365 U. S. Components, Inc. -Power connectors 320 Panoramic Radio Prods., Inc.- Sub -sonic analyzer 366 U. S. Engineering Co., Inc. -Etched circuits 321 Philco Corp.-Transistor 367 United Transformer Co.- Filters 322 Polarad Electronics Corp.-Test equipment 368 Unitek Corp. -Precision welder 323 Polarad Electronics Corp. -Microwave signal generators 369 Varfiez Corp.-Tubing & sleeving 324 Polytechnic Res. & Dev. Co., Inc. -Resistor 370 Varian Associates -Klystron bobbins 325 Precision Paper Tube Co. -Coil 371 Victoreen Instrument Co.- Resistors 326 Turntable Presto Recording Corp.- 372 Viking Electric Co.- Miniature connectors 327 Pyramid Electric Co.- Capacitors & rectifiers 573 Waterman Products Co., Inc. -Pocketscope & components 328 Radio Corp. of America -Test equipment 974 Weckesser Co.- Screws, nuts & clips 329 Radio Corp. of America -Transistors 375 Western Gear Works -Electrical rotary equipment 330 Radio Materials Corp. -Disk capacitors 376 Weston Electrical Instrument Corp. -Oscilloscope Mfg. Diodes 331 Raytheon Co.- 377 Wiedemann Machine Co.- Turret punch press 332 Raytheon Mfg. Co.-Wave oscillators 378 Zero Manufacturing Co. -Deep drawn cases 333 Raytheon Mfg. Co. -TV microwave link

DON'T DELAY -MAIL CARD TODAY NOT GOOD AFTER OCT. 1, 1955

FIRST CLASS FIRST CLASS PERMIT No. 22273 PERMIT No. 22273 Sec. 34.9, P.L.&R.) Sec. 34.9, P.L.&R.) NEW YORK, N.Y. NEW YORK, N.Y.

3USINESS REPLY CARD BUSINESS REPLY CARD 10 POSTAGE STAMP NECESSARY IF MAILED IN UNITED STATES NO POSTAGE STAMP NECESSARY IF MAILED IN UNITED STATES

POSTAGE WILL BE PAID BY POSTAGE WILL BE PAID BY TELE -TECH TELE -TECH A ELECTRONIC INDUSTRIES A ELECTRONIC INDUSTRIES 480 LEXINGTON AVENUE 480 LEXINGTON AVENUE NEW YORK 17, N. Y. NEW YORK 17, N. Y. 2ldwell- Clements, Inc. =imam=111 Caldwell -Clements, Inc. www.americanradiohistory.com REORP/RIE SILICON MIXER DIODES Ai ABM

Here's another step forward by Bomac -a reversible silicon mixer diode. The 1N415 and 1N416 series are the first silicon diodes to have selective polarity. Polarity is indicated by the letters REV located at one end of the diode. To change the polarity, just switch the position of the end cap. With the end cap attached to the contact pin at the unmarked end of the cartridge, the diode will be of normal polarity. With the end cap attached to the end marked REV, the diode will be of reverse polarity. The complete assembly, with either polarity, is electrically the same as its equivalent type of regular silicon diodes. The Bomac 1N415 and 1N416 series will meet all conditions of JAN IA specifications.

NORMAL POLARITY I N415 - I N416 SERIES

REVERSE POLARITY

Max. Noise IF Equivalent Frequency Conversion Ratio Max. Imped. Burnout Band Type Type Mc Loss ,db, Times) iVSWR' OHMS, erg UNIQUE PACKAGE PROTECTION X 1N415B 1N23B 9375 6.5 2.7 -- - 1.0 IN23BR 9375 6.5 2.7 - - 1.0

5OfA4C1N415 X 1N415C 1N23C 9375 6.0 2.0 1.50 325 -475 1.0

MIGO. WT BpMAC u6s.111C. 1N23CR 9375 6.0 2.0 1.50 325 -475 1.0

X 1N4150 1N23D 9375 5.0 1.7 1.30 350 -450 1.0 1N23DR 9375 5.0 1.7 1.30 350 450 1.0 For complete protection during shipment and storage RF Protective Bomac has designed a reusable Package' S 1N416B 1N21B 3060 6.5 2.0 - -- 2.0 Nhich conforms with MIL -EIB specification. Diodes stored in 1N21BR 3060 6.5 2.0 2.0 this package are completely protected no matter how many times they are handled after the original seal S 1N416C 1N21C 3060 5.5 1.5 -- - 2.0 is broken. 1N21CR 3060 5.5 1.5 2.0 PAT APPLIED FOR BOOTH 215, 216 -WESCON SHOW

We invite your in. Catalog on request. gwnes regarding Romac ,taGorafork:4, Jitc. Write(on your company T -8 ENGINEERING BEVERLY. MASSACHUSETTS letterhead) Dept. DEVELOPMENT BOMAC Laboratories, GAS SWITCHING TUBES, TR, AIR and NOR DUAL TR and AIR TUBES SILICON DIODES WAVEGUIDE SWITCHES Inc. Beverly, Mass., or PRODUCTION REFERENCE CAVITIES MAGNETRONS PRESSURIZING WINDOWS SHUTTER TUBES HYDROGEN THYRATRONS REFLEX KLYSTRONS TRAVELING WAVE AMPLIFIER TUBES SYSTEMS phone Beverly 6000.

www.americanradiohistory.com RCA -2N77. For low -power of applications such as in hearing -aid devices.

RCA- 2N105. For low -power of RCA- 2N104. For applications, such as in low -power at service hearing -aid devices and other RCA- 2N109. For at amplifiers in communications applications where extremely and class B p -p power output and other types of small sire is required. stages of battery- operated electronic equipment. portable receivers. Two 2N109's

in class B p -p circuit will give a power output as high os 150 mw. Shown actual size

Exceptional Uniformity Extreme Stability _through= life!

I HIGH- QUALITY

For applications where extreme stability is paramount The RCA -2N77, -2N104, -2N105, and -2N109 are hermetically sealed, germanium ... for circuits where very low collector cutoff current p -n -p alloy -junction types - and each carries the RCA one -year warranty! is essential ... for services that require exceptional uni- RCA -2N77 RCA -2N104 RCA -2N105 RCA -2N109 formity of characteristics ... RCA -developed transis- MAX. RATINGS (Absolute Values): tors provide consistent high- quality and dependable Collector Volts -25 -30 -25 -20 performance. Closely- controlled processing and manu- Collector Ma. -15 -50 -15 -SO Coliector Dissip. (mw) 35 up to 150 35 50 facturing techniques assure high -level performance Operating Temperature (°C) 50 70 50 50 initially and THROUGHOUT LIFE! TYPICAL OPERATION:t Collector Volts -4 -6 -4 -4.5 Here again is specific technical evidence of RCA's Collector Ma. -0.7 -1 -0.7 -13 Alpha (Collector - continuous effort to provide advanced-quality prod- to -base connection) 55 44 55 7ptt ucts. For a quick rundown on the ratings and charac- Power Gain (db) 41 41 42 30" Power Output (mw) approx. - - - 75" teristics of the four transistors pictured here, see the Source Imped. (ohms) 2450 1400 2300 375 per base connection chart. For complete technical data, call your RCA Load Imped. (ohms) 20,000 20,000 20,000 100 per Commercial En- collector Field Representative -or write RCA, Noise Factor (dh) 6.5 ay. 12 max. 4.5 ev. - gineering, Harrison, New Jersey. Cutoff Freq. (kc) 700 700 750 - Figure of Merit for At WESCON Show, visit RCA ... Booth 801 -802 High Frequency Performance (Mc) 1.7 1.6 2.6 -

" Depends on lemperatur and circuit parameters tt Large- Signal t In common-emitter cire it at 25 °C, ambient temp. C RADIO CORPORATION Of AMERICA " For 2 transistors in clos B of circuit, and maximum distortion at 10 percent FL ECTRON TUBES HARRISON, N.J.

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