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HOW 'SCOPE AIDS 5IY AUDIO TROUBLESHOOTERS November. 1959,

__ 1ST TIME IN RESISTOR HISTORY

COMPLETE 11Y-3\ 10 -WATT POWER RESISTOR, ! ,/ 49 5 _^ COVERAGE N.oo ,1 Q,s`( IN JUST ONE . I / pA `'., POCKET CASE! 1 ,-' 1, .pP$ ., ./ `t "....1_,-1 `' ,'L -.d-~o.. .pe t.°o.,

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HERE'S THE SECRET! New ! Compact ! Efficient! With the new IRC MULTI -RANGE RESISTOR IRC ONLY 5 TYPES MULTI -RANGE COVER RESISTOR KIT! 200 Here's super -convenience on power VALUES ASSORTMENT =-55 resistors. Have complete 10 -watt coverage right at your fingertips 10 -watt ranges from 1/4 to SOK ohms CONTAINS HANOV-PAKS ... 5 in a stock so compact it fits in the The first new approach to power .11 palm of your hand-. No delays for resistors in 25 years. 4 separate lO Type R Resi,lors elements sealed in a single, steatite odd values ... no costly inventories case. Axial lead design speeds re- of slow-mo\ ers. placement. Steatite case provides superior insulation. Kit gives complete 10 -watt coverage of 200 values. dealer )1('t Contains 5 Handy-Paks-2 of each Type QUICK, SIMPLE TO ADAPT ! MR resistor-1O Multi -Range units. Rigid, clear -plastic box with hinged lid. Only 10 basic terminal interconnec- tions ... all with axial leads. Con- Measures only 51/4 x11/4 x 3/," nection diagrams in each Handy -Pak.

For the required re- Available Now From sistance value, simply Your solder desired inter- IRC Distributor. Order connection and cut Yours Today ! MT unwanted terminals. INTERNATIONAL RESISTANCE CO. IRC Dept. 903, 401 N. Broad St.. Philadelphia H. Pa. In Canada: International Resistance Co., Ltd., Toronto, Licensee IC C5- ICÍAJII Now Including SERVICE World's Largest Electronic Trade Circulation Magazine

ALBERT J. FORMAN Editor November, 1959 ARTHUR P. SALSBERG Managing Editor JACK HOBBS Technical Editor V. SPINETTA Assistant Editor B. FRONT COVERServicing oudio equipment today means moving beyond he VTVM test range. C. F. DREYER Consultant Art Director Disturbing distortions are not always evident on the indicator of a meter. Freauently o scope/oudio PAT DRUMM Reoder Service oscillator troubleshooting technique is needed. Understanding the use of this more sophisticated test equipment will enable technicians to satisfy the discerning ears of present-day hi-fi owners. See article M. FARRIS Editorial Assistant starting on page 36. Address all mail to 17, N. Y. 480 Lexington Ave., New York FEATURES AND ARTICLES Telephone YUkon 6-4242

HOWARD A. REED Publisher "Don't be a Vidiot!" (Editorial) 33

BUSINESS DEPARTMENT "Tuning ín the Picture" 34 Manager C. HENNESSY New England Soles Audio Troubleshooting with a Scope R G Middleton 36 W. ZURKAN Eastern Sales Manager "Tough Dog Corner" H. E. Chace, F. A. Salerno 39 N. McALLISTER Production Manager M. RUBIN Circulation Manager Conquer Obscure Video Defects Ray Mansfield 40 Asst. Circulation Manager J. PREVET Choosing a Mobile Radio System Allan Lytel 42 P. H. DEMPERS Regional Manager The Bureau of Standards 5010 W. Howard St., Skokie, Ill. Computer Analyzes Human Heartbeat National 45 Telephone ORchard 5-1355 Approach ro Printed Circuit Servicing Bernard Green 46 CHRIS DUNKLE & ASSOCIATES What's Your Service Score? E W Fair 48 Californio Representative 740 S. Western Ave., Los Angeles 5, Calif. Master Television Antennas 49 Telephone DUnkirk 7-6149 Building a Technical Library 52 420 Market St., San Francisco 11, Colif. Telephone SUtter 1-8854 Free Literature 56

BERNIE EDSTROM Regional Manager Shop Hints A J. Krukowski 66 15605 Madison Ave., Cleveland 7, Ohio Telephone LAkewood 1-7900 New Tubes and Components 68

JOHN R. KIMBALL & CO. New Audio Products 70 Mountain States 96 420 Market St., San Francisco 11, Calif. Microphone Loading Telephone DOuglas 2-9183 DEPARTMENTS

Editor's Memo 4 Calendar of Coming Events 35 Letters to the Editor 8 New Products 56 News of the Industry 18 Audio Newsletter 88 Reps. and Oistrs. 25 Association News . 93 ELECTRONIC TECHNICIAN & Circuit Di- Catalogs and Bulletins 28 New Books 100 gests, including Service, November, 1959. Vol. 70, No. 5. 5.50 o copy. Published monthly by Electronic Technician, Inc. Pub- lication office, Emmett St., Bristol, Conn. DIGESTS 105 Editorial, advertising and executive offices, CIRCUIT 480 Lexington Avenue, New York 17. Tele- phone YUkon 6-4242. IN THIS ISSUE Entered as second class matter at the Post at Bristol, Conn., June 10, 1954. Office (16 pp. latest schematics-see last pagel Subscription rates: United States and Can- AUa1.MENT ^1111"« I. T.nw,....+.. ada, 54.00 for one year; 56.00 for two .. c...... -ti r ADMIRAL: TV chassis 117Z3DBM, 17Z3DBN Oman. 1:,:r: years; 58.00 for three years. Pan-American e..«.. 1; nr FISHER: FM -AM Stereo Receiver Model and ford gn countries: 57.00 'for one year; ...o.n.'.:ic. Ml. l .,wg "i. 600 510.00 for two years; 514.00 for three ,..nx...., . . Qv./. -rm.., ... ' years. Copyright 1959 by Electronic Tech- a MAGNAVOX: TV Chassis 32 Series nician, Inc., New York. H. Reed, Presi- lARTS ' `,y,IYC ®® PHILCO: TV Chassis 10H25, 10H25Ú, dent; A. Forman, Executive Vice -President. \ 10H25R Title registered in U. S. Patent Office. Re- 4,; ©® production or reprinting prohibited except VOZALINE: Citizens Band Transceiver by written authorization of publisher. Model ED -27 Printed in U.S.A. by Hildreth Press. the smartest move you can:.-ma e : is to the world's most .complete ra. 639-N ;CASE line of VOMs for every putpose 1 o i

,. __--_=--

MODEL PMODEL 4¡ 666-R : .w y 666- / - NH s

MODEL 630 MODEL 630-A

MODEL 630-A PL

i e MODEL :.. ,- 630 -NA r

Quality.. . First to last

TRIPLETT'.YLECTRICAL_ .INSTRUM.EÑT' COMPANY

° BLUFFTOÑ,-_'OHIO o Model 639-N Case $9.50. Handsome, black cowhide feather. Center -cover flaps snap back for full view of scales and complete access to instrument without removal from case. Model Pt. T -225-A-33 Tester Stand $0.50. Metal, holds tester in approximately 45' angle; facilitates easy reading. Probe for High Voltage Testing $14.50. For models 630, 630-A, 630 -PL, 630 -APL, and 631. Completely insulated polystyrene; guard -type handle. 11%" long; 48" hi -voltage wire lead with banana plug at tester end. Available in 0-12,000 AC or DC volts, and 0-30,000 AC or DC volts. Qualify.. . Model 630-T $54.50. Specialy designed for telephone First to last maintenance. 2/, accuracy on DC. Fused protected circuit protects resistors and meter in ohms ranges. Special neck strap holds instrument, freeing both hands. Banana jack connectors eliminate all shock hazard. Completely insulated ` case protects from ground. for TES ER A/_ Model 666-R Pocket VOM $29.50. Hand size, Ideal electrical maintenance. With recessed range knob it fits SN D 0 easily into case. AC rectifier pre -calibrated unit for easy replacement. Banana jacks at panel top prevent leads falling -=t over meter dial. Single king-size selector switch ¡minimizes ti Kt- incorrect settings, burnouts. Molded case streamlined, fully n OLTAGE ODEL insulated. Compact, hand -size; , PROBE 630-T Model 666-HH Pocket VOM $27.50. 3" meter integral with panel, adjusted to 400 microamperes at 250 millivolts. Only 3 jacks necessary for all ranges. 1, 19 ranges.

. .. -EI Dual sensitivity for extra ranges; Model 625 -NA 554.50. large mirror scale for super readability. 3 -color meter scale 1 5" long. 6" instrument, 0-50 rricroamp. AC volts at 10,000 0/V for decking many audio and high impedance AC 38 ranges. Molded insu- 11 MODEL INTER OR circuits usually requiring VTVM. 626.NA VIEW lated case Interior V ew showing advanced engineering features of Molded mounting for resistors and (630) , all Triplet VOMs. :^-:/ shunts allows direct connections without cabling. Elimi- iF .... nates shorts. Longer life. Model 630 544.50. Popular, streamlined; long meter scales for easy reading. Outstanding linear ohm scale; low reading

1 ohm, high 100 megs. Single king-size selector -switch 9 minimizes incorrect settings, burnouts. High sensitivity: _ -... . 20,000 ohms per volt DC; 5,0.00 AC. Molded, fully insulated case. Model 634A 554.50. Laboratory type; %% resistors for greater acuracy. Long mirrored scale eliminates. parallax. Banana ja:ks, low resistance connections; high flux magnet increases ruggedness. Single king-size selector switch MODEL minimizes incorrect settings, burnouts. Molded fully insu- 630 -PL lated cast Model 630 -PL $44.50. Instant -vision, wider spread scales; MODEL streamlined case; handsome modern design. Unbreakable 10. window. Dutstanding linear ohm scale; low:reading .1 ohm; high to 100 megs. Single king-size selector switch minimizes incorrect settings burnouts. 5 to 500,000 cps frequency response in AC measurements. DC Polarity Reversing switch. High sensitivity: 5,000 ohms per volt AC; 20,000 ohms per volt DC. loads Model 10 Clamp -On Adapter $14.50. Checks line with model 310 (can also be used with 6 other models). Instant, a_curate, safe. No circuit breaking or work inter- ruption Easy range switching. Available in 6 AC Ammeter ranges: C-6-12-30-60-120-300. Clips around single wire to read AC. Amperes direct. Use with adapter 101 to instantly divide 2-c inductor cords. Molded case fully insulated, black MODEL plastic wi.h engraved white markings. 631 Model 631. -APL $54.50. Laboratory type with 51%, resistors. more accurate movement. Long mirrored scales eliminate parallax. Unbreakable window. Single king-size switch minimize! incorrec: settings, burnouts. 5 to 500,000 cps frequency response in AC measurements. DC Polarity Reversinc switch. High sensitivity: 5000 ohms per volt AC; f 20,000 oh ns per volt DC. Molded case fully insulated.

Model 630 -NA $74.50. Super DeLuxe with 70 ranges- nearly do Able conventional types. Frequency compensated from 35 cis to 20 kc. Temperature compensated. Accurate within 15:% lull scale reading on DC. Large open front meter easy to read. Unbreakable window. Mirrored scale. Meter pr.tection against overloads. Molded fully insulated case. Model 631 Combination VOM and VTVM $64.50. Two fundame.tal units at the price of a single tester. The No. 1 MODEL instrument for all electronic men. Battery operation assures VTVM s ability and long life. Sensitivity PLUS. 1.2 volt 310 (VTVM) Lange is equal to more than nine million ohms per volt. Large easy to read mete, with unbreakable face. Single king-size selector switch minimizes incorrect settings. burnouts. Molded case fully insulated. Model 313 534.50. The only complete miniature VOM with 20,000 ohms per volt and selector range switch. Self - shielded against strong magnetic field. Rugged, high torque, oar -ring instrument. Unbreakable plastic meter window. Converts to common probe-frees one hand-by fitting interchangeable test prod into fop. Standard sensitivity 20,00 ohms per volt DC, and 5,000 ohms per volt AC. u. Accurac- 3% DC. Molded fully insulated case. .M .,r ..

.- 4 Editor's t Memo 4 '

Half of an editor's job is getting correct information for his readers. The LESSfssA other half of the job is keeping incorrect AT information out of the magazine. fNUA A typical blooper is one we made in September. We labeled a series con- T/ pN nected meter as a voltmeter. Back to electronic kindergarten for us. As you would expect, it should have been tag- ged ammeter. Voltmeters, we recall someone telling us many years ago, must be shunt connected. There is one publication we read which refuses to recognize when it has gone off half cocked. It's Consumer Reports, published by the product rating organization, Consumers Union. Their October issue, for example, contains an article entitled, "The Case of pólyfoam the Televiewing Guinea Pigs." The vic- tims are supposed to be consumers who buy TV sets with printed circuits. RG-8/U TYPE CABLE There was a time when a number of manufacturers were producing some real printed circuit clogs. That was when DESCRIPTION everybody's voice was needed to protest an AMPHENo1 introduces, a new' polyfoam,dielectric coaxial outrageous design. Where were you cable then, CU? Now, after manufacturers equivalent of RG-8/U but with a significant reduction ín have made such major improvements attenuation. Part, number is 621-111. as schematics on the printed circuit 0 I board, snapout boards for easy acces- sibility, frames for rigid supports, ELECTRICAL AND MECHANICAL CHARACTERISTICS stronger bonding. etc., CU complains. Now, after technicians sweated to learn Impedance -50 ohms -} 2 ohms how to cope with printed circuits, and Attenuation -4.0 db/100 feet nominal at 400 inc. specialized tools have become available, CU tells its V. readers how difficult serv- Dilectric Strength -5000 RMS icing is. Coioña-3000 V. RMS What CU does not say is that TV, Capacity -26.0 mmf/ft., nominal almost alone among all consumer products, is giving much more at lower Overall Diameter-.405" ±.010" ° cost than 10 years ago. A bulky 10- incher used to cost $350 and up. Today, a FEATURES compact 21" set with low noise tuner, brighter picture and other improve- From` 12% to 15% less attenuation than standard RG-8/U. ments may he obtained for under $200. In any case, even if CU disagrees with Lower capacity than solid dielectric 50 ohm cables. us, they might at least have the cour- Uséd'with standard UHF Series connectors. tesy to answer our letter. When an editor isn't grousing, he's If either pecking away furiously at some defenseless typewriter or blue-pencil- ing some author's painstakingly crafted words. But if he's worth his salt, the editor does it for one reason-to get the AUAtIABILITY best damn story for his reader. When an editor is out nosing about., Contact your local a typical kick-off question is: "How's Authorized AMPHENOL business?" If an editor lands on your doorstep with this ri poser, you might Distributor! explain to him, as was told to us: My business is like loving. When it's $:A distributor division good, it's wonderful. And when it's bad PNEHaL_ -it's still pretty good.

AMPHENOIBORG ELECTRONIC! CORPORATION brondview, illinois

4 ELECTRONIC TECHNICIAN November, 1959 utmost in performance Y E 33M MOLDED mylar* CAPACITOR computers instrumentation test equipment applications filter networks transistor circuitry amplifiers

Sangamo Type 33M molded mylar` capacitors Life Test: These units will withstand a life combine the excellent electrical performance test of 250 hours at 125% of rated voltage at characteristics of mylar' dielectric material 85°C. Life tests at 125°C. should be made at with a molded case of high moisture resistant 125% of the derated voltage. thermosetting plastic. Dielectric Absorption: Dielectric absorption Temperature Range: "The Type 33M is de- of Type 33M capacitors is less than half that signed to operate over the temperature range of oil impregnated paper capacitors. of -55°C. to +85°C. Satisfactory perform- Moisture Resistance: Type 33M capacitors ance at 125°C. can be obtained by derating the will successfully withstand the moisture re- voltage to 50% of the 85°C. value." sistance tests specified in Spec. MIL -C -91A. Dissipation Factor: The dissipation factor Insulation Resistance: The insulation resist- of the Type 33M capacitor does not exceed ance of these capacitors will exceed 5,000 1% at normal equipment operating tempera- meg/mfd. over the normal operating temper- ture over the complete audio frequency range. ature range. Tolerances: Available in capacitance tolerance values of ±5%. -`'10%. ±20%. Write for engineering bulletin TSC-206A

DuPont's trademark for polyester film. SAN GAMO ELECTRIC COMPANY

SPRINGFIELD. ILLINOIS SC -59-6

ELECTRONIC TECHNICIAN November, 1959 5 These leading TV. stars -are appear. ng n. Winegard ' national

ads in -

Tálk, . LIFE nk.. BETTER 'HOMES & GARDENS FARM JÓURNAL Steve Allen :; * Ward. Bond

YO USG t.owEYY,, Compare what you get- see Get what's best for you! THE You've got to sell every day, every month, all year- AND THAT'S EXACTLY THE WAY WIN EGARD ADVER- TISES, month in, month out, all year, non-stop, in / big space, .. in the big magazines, featuring the big- f v sN0`N gest TV shows and stars. No one -shots. No bull. No brag. No baloney. But NBL tv s."`"",( cash -on -the -line for the industry's longest, stongest, national campaign- Best by the industry's most dynamic local ,'nbacked new dealer tie-in sales material, all FREE. Examine the backing you get, get what's best for you' Call your Winegard Distributor now, or write Winegard, 3019-1 1 Scotten, Burlington, Iowa.

begt AN vim = tens Ask .your. distributor ° áboút Gtt eed tenved BR rst neww pa FREEt6 GVa FUL. Wiriegard'-s e-;. generoús. dealer"' taht,ne1s .'- - . . - [,:i about threrV G SeU ' . .. r channels. the snore or rd picture ío=óp. advertising .plpn:: wqne8 `osta.ege ,r ree brochure ghosts. color . .. . . snow. or O DAY °r lows e. * FhwryKCrnrite our/0100n. . o O Scotten, .. GVt,ytAN 3p4SA1 see F. ° . y°ur_..oAR ° ti "'-

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Walter Brennan Modél. SCL4 Super. Color'Ceptor :=

941. NO. U 5 2100105 . C4N1.04 110. 511994 WINEGARD HELPS PUT YOUR NAME ON EVERY And who offers HIGHWAY ENTERING YOUR TOWN the best of all TV antennas- YOUR NAME HERE FREE GIANT ROAD SIGN With every Color'Ceptor an- PROVED- tenna you buy, you get a Free promotion buck. Use your pro- GUARANTEED? BEST RECEPTION motion bucks to get the sales aids that will help you most. Leading Consumer Research i{ j ' , y' / / . . - Metal Road Sign, Illuminated Organization Confirms what r Metal Front 1 Window Sign, Store Already Sign, Silk Wall Banner, Bal- the World Knows- GOLD TV 8 FM loons, Shirt Emblems, Truck Decals, Full Color Postcards It's Winegard and Mailing pieces, Gold Ano- AN T E N NAS dized display pole. COLOR'CEPTOR!

_SELL THE ;LINE %.:T HAT REALLY HELPS :YOU SELL!

éciturel the Leader . LETTERS :STROM BERG-CARLSON To the Editor PUTS YOU INTO Interference Repair THE.IllIGH-PROFIT Editor, ELECTRONIC TECHNICIAN: Many of my customers were com- plaining about TV interference in one SOUND section of this city. I asked them to check with their neighbors when the interference started to see if an FM BUSINESS radio was being used. Not having any success with this method, I took a field strength meter, inverter and a folded dipole antenna on my truck and rode through the streets of the interference area until I finally reached the right house. Checking over the set, I found a defective 6J6 tube in the booster. After replacing this tube there weren't any further complaints of this nature. CHARLES ST. JEAN St. Jean Appliance Co. Westfield, Mass.

A newspaper report of this successful radio sleuthing said that grateful resi- f' dents of the area got together and showed their appreciation for uncover- ing the trouble source.-Ed.

Stereo Sales Editor, ELECTRONIC TECHNICIAN: Stereo has not hit my part of the country like I think it should and could. I feel the reason for this is because the public actually does not know enough about it. I am expanding my business Illustrated: One of many typical SIGNET assemblies. with the intention of stressing stereo sales, and would like to inform the general public about it. I am convinced Tired of the old service -bench grind? that if I could pass out booklets on stereo, it would create more interest for a the buyer. I want you to know that I Here's your chance to get into clean, high -profit business-sell- think the information from your maga- ing SIGNET SOUND by Stromberg-Carlson. zine is invaluable. PERRY GRIFFITH Customers? You'll find plenty of them right in your own neigh- Griffith Radio TV Sales & Service borhood. Taverns, restaurants, clubs, meeting halls, churches, Kermit, Texas -you can think of many more yourself. The flexibility of SIGNET package assemblies is so great that We Goofed can Editor, ELECTRONIC TECHNICIAN: you easily satisfy' any need for sound reinforcement. SIGNET Re the article. "Servicing Home Vac- SOUND is unequalled for economy. ease of installation and high- uum Cleaners," in the September issue, the text referring to fig. 2 states that if fidelity sound reproduction. And you get the added ad\ antage of the winding is open, the lamp will not light. If I know my volt meters. an open dealing with one source for all components. winding is not the only thing that will Get the complete SIGNET story now. For illustrated literature keep the light from lighting. The resistance of the meter in series would play and our "Sound Installation Guide" s rite to Special Products a part in preventing the lamp from lighting. In spite of this, I really do like Division, 141;1 North Goodman Street, Rochester 3, New York. your publication! JOHN H. LEACOCK Lincoln, Nebraska "There is nothing finer than a Stromberrj-Carlson" Is oar face red! The meter in series should have been labeled "ammeter."- STROMBERG-CARLSON Ed. A DIVISION OF GENERAL DYNAMICS (Continued on page 12)

8 ELECTRONIC TECHNICIAN November, 1959 CBS Ronette Cartridges but call-backs ...because they breathe

IMPREGNATING WAX

- wF

CRYSTAL

r r IMPREGNATING

GREASE a.=. .

ENTRAPPED MOISTURE 9:

AND EROSION

CBS-RONETTE CARTRIDGE OTHER CARTRIDGES Specially grown crystal is Ordinary cristal is not impervious unimpregnated. exposed to to moisture, must be impregnated, atmosphere, breathes. is gradually destroyed and remains intact. by trapped moisture.

An exclusive method of growing and processing Rochelle salt crystals protects CBS-Ronette stereo and monaural cartridges from adverse climatic conditions. These crystals, unlike all others, do not require water-

proofing and impregnation . . . which actually traps moisture in the crystal and eventually dissolves it. Because of its unique structure, the CBS-Ronette crystal can be directly exposed to the air. It breathes and does not retain destructive moisture that would dissolve it. This means dependable performance even in the trop- ics. And to you, it means freedom from irritating, costly call-backs due to shortened life of ordinary cartridges. Cut your cartridge call-backs ... always ask for CBS- OTHER CBS-RONETTE Ronette, the world's most popular cartridge. ADVANCED ENGINEERING FEATURES. . Easy -to -install clip -on styli with foolproof design assuring positive alignment. ELECTRONICS . Precisionpolished jeweled styli throughout line. CBS . Simplified line ... 27 models replace 500. Danvers. Massachusetts . Exact replacements for over 6,000.000 cartridges. A Division of Columbia Broadcasting System. Inc.

ELECTRONIC TECHNICIAN November, 1959 9 FIRST Bantam GT receiving CBS tubes FIRST Bantam Jr. subminiature tubes FIRSTS FIRST rectangular picture tubes FIRST receiving tubes designed IÍ1 a II especially for TV FIRST receiving tubes rated for Continuous Television Service FIRST practical color picture EBES tube, CBS-Colortron

CBS FIRST double-faced phonograph disc FIRST 1p long-playing record FIRST complete symphony FIRSTS recording in U. S. A. FIRST "360" hi-fi phonograph IN FIRST major recording company with a record club FIRST Stereo Seven - new COLUMBIA -,, seven-inch 33% rpm record RECORDS

Leonard Bernstein, outstanding musical personality, is a Columbia Records star.

WHAT THESE FIRSTS MEAN TO YOU In records or tubes, the CBS family habit of being first helps guarantee you the quality of performance CBS that only leadership can deliver. This leadership is your further assurance that: CBS tube quality cuts call-backs to the bone. CBS tube quality insures your customers of dependable performance. Receiving, industrial and CBS tube quality offers built-in profits for you. picture tubes transistors Ask for the leader with the top -rated name your and diodes audio components and phonographs customers know and trust. Ask first for CBS. CBS ELECTRONICS Danvers. Massachusetts Electronic manufacturing division of Columbia Broadcasting System, Inc.

10 ELECTRONIC TECHNICIAN November, 1959 liffigeS6. I HARMONY CBS ELECTRONICS

Portable Hi -Fi Stereo with Console Sound

Model 208, Stereophonic Porta)le, $39.95* Independent So much for so little... a value that you can recommend with confidence. Amazint realism! Has three -speed turntable, Service -Dealers! True -Track :one arn, and CBS-Ronette high compliance This is Your line... turnover cartridge with jewelec styli. YOUR PROFIT OPPORTUNITY

Again CBS Electronics makes it possible for you to expandyour business with a dependable fills a Harmony product that popular demand. Model 224, Automáic Stereophonic Porable, $99.95` Phonographs are engineered to uphold your position Big console performance. Has a modifies simplex push-pull in the community as an expert consultant on amplifier developec by CBS Laboratories, balanced woofers outstanding value in audio equipment. You can and tweeters, high fidelity Columbia CD cartridge with fool- choose from three stereophonic and two proof single jewelec stylus, noiresonant tone arm, treble and monophonic portables, in decorator styles, bass gain controls, hn watts total peak output, and CBS tubes. and priced to sell under $100.00. Plays records of all speeds automatically.

'Suggested retail price. Slightly higher west of the Rockies. r

Identify yourself as a Harmony Phonograph dealer. Get CBS ELECTRONICS Massachusetts your Harmony Phonographs, attractive consumer line Danvers, folders and many other sales helps from your distributor. Gentlemen: Please send ne the Harmony Phonograph consumer line folder, Or, mail coupon today. dealer helps b)oklet, and the na-ne of my nearest distributor.

Name CBS ELECTRONICS Address Danvers, Massachusetts City Zone A Division of Columbia Broadcasting System, Inc. S:ate

ELECTRONIC TECHNICIAN November, 1959 11 (Continued from page S) one of containment within the realm of regular distributors. This will eliminate a manufacturer's service obligations to many of the parts procurement prob- our customers. We have found that the Factory Service lems which have plagued the independ- same independent service technicians ent service technician in the past. Editor, ELECTRONIC TECHINIAN: who made the fantastic growth of the K. H. BROWN, Manager 1 wish to call your attention to the television industry possible from its in- Headquarters Service Factory Service item which appeared fancy are qualified and capable of Westinghouse TV -Radio Div. in your September issue on page 37. In providing first rate service to our con- Metuchen, N.J. particular, we wish to take exception to sumers. In fact, we feel so strong on this the statement: ''Factory service opera- score, that we are presently engaged in tions have been dropped by Westing- a program to authorize many additional house TV -Radio Set Division." Since independent service companies for work Antenna Claims the Westinghouse TV -Radio Div. on our products. has Editor, ELECTRONIC never engaged in "factory As pointed out in your article, we are TECHNICIAN: service"-or For some time I any other form of captive franchising additional have been bothered service-it independent parts by the cockeyed claims of would be impossible for us to drop such jobbers to the antenna handle our parts in outlying manufacturers. Couldn't you operations. Our policy has always been markets work out not presently serviced by our some standard measurements, It is high time some sort of brake is applied. They make claims, but none of them actually make any direct comparative statements of their product's characteristics. IF Yr*vL.Qt THOMAS C. RUDINEY .P..'a4^'` v Toronto, Canada in CR Tubes Philco offers you f Double Protection Reader Confused Editor, ELECTRONIC TECHNICIAN: with Bond and Warranty I'd like to purchase some basic testing equipment. I'm at a loss concerning ALL NEW ... Electron Gun dollar -for -dollar value. Do you have ALL NEW ... Exclusive Phosphor Coating an impartial Buyer's Guide to aid me ALL NEW ... Long Life Filaments in making a decision? ALL NEW EDWARD HRVOICH ... Super Efficient Cathode Baden, Pa. ALL NEW ... Focusing Anodes Electronic Technician has published ALL NEW ... Aquadag Shell Coating manly articles covering the use of various instruments and surveys listing Quality specifications. Individual features will Tested- not appeal equally to all persons. Life Tested Therefore, it's improbable that a "best - buy" type guide can actually be im- ;5,7: partial_ A good guide for purchasing test instruments is: Know your personal needs, review the ads and brochures Insist on Genuine offered by various manufacturers and , discuss the problem a local J with electronics distributor carrying a variety of brands. Purchasing an instrument of a reputable manufacturer 1 OpO will further insure good value for your money.-Ed. Star Bright 20/20 ALUMINIZED PICTURE TUBES

SENSATIONAL FREE OFFERS !

PN I LCO SS G PROGRAM Get All of the Details From Your Local Philco Distributor

ACCESSORY DIVISION PH.I LC O WORLD-WIDE DISTRIBUTION

12 ELECTRONIC TECHNICIAN - November, 1959 FIRST CARDIOID AT SUCH LOW COST! CUTS BACKGROUND NOISE Accepts Only the Sound You Want

IDEAL FOR STEREO RECORDING OR PUBLIC ADDRESS Unidirectional pick-up and tailored response of the new E -V 729 Cardioid make it economically ideal for many applications in public address, paging, dictating, home recording, amateur communications, and other sound use. The 729 Cardioid rejects unwanted rear -background noise and room reverberation. Per- Typical Cardioid Polar Pattern mits working from nearly twice the distance of conventional microphones. Reproduces only the sound you want, more faithfully and distinctly. Instantly slips in or out of desk -base supplied with microphone. Feels good in the hand.

kVhere economy is a factor, you still have every advantage in selecting Electro -Voice. You get the benefit of the same high quality engineering and manufacturing that have made E -Y the choice of television networks. You choose from the most complete line, the most accepted microphone line, in the world. You are certain of finest value and guaranteed satisfaction or your money back.

Model 729

Model 729 Cardioid Ceramic. Complete with desk -base and floor stand adapter. Ceramic generating element withstands extremes of temperature and humidity. Response 60-8000 cps. Output -55 db. High impedance. Two-tone gray. List Price, 524.50 Model 729S. With switch. List, 526.50

712 . 727

t .'1, . CHOOSE FROM THESE AND OTHER E -V LOW COST MICROPHONES

Model 926 Slim Crystal. For hand or stand use. Model 924 Lavalier Crystal. For chest or hand Non -directional. Moisture sealed crystal. Re- use. Non -directional. Moisture sealed crystal. sponse 60-8000 cps. Output -60 db. High im- Response 63-8000 cps. Output -60 db. High pedance. Tiltable head. Satin chrome. List, $29.50 mnedance. With neck cord, support clips, and cable. Satin chrome finish. List, 520.00 Model 920 "Spheres" Crystal. All -direction pickup. Moisture sealed crystal. Response 60-7000 Model 727 Slim Ceramic. Instantly lifts out of cps. Output level -50 db. High impedance. Satin base for hand use. Non -directional. Ceramic gen- 718 chrome finish. List, 527.50 erating element. Response 60-8000 cps. Output -55 db. High impedance. Two-tone gray. With Model Model 715 "Century" Ceramic. Non -directional. 7L2 Compact Ceramic. Fits comfortably desk -base and floor stand coupler. List, $18.00 in the hand. Non -directional. Response 70-7000 For table, stand or hand. Ceramic element. Model 7275. With switch. cps. impedance. List, 520.00 Response 60-7000 cps. Output -55 db. High Output -55 db. High Gray impedance. Satin chrome. List, $13.00 Styron case. List, $7.50 Wide choice of Dynamic' models, also available. Model 7155. With switch. List, 515.00

Model 615 "Century" Dynamic. Has exclusive See Ycur E -V Distributor, or Write for Catalog No. 136 to Dept. 119-T indestructible Acoustalloy diaphragm. Response 80-8000 cps. Output -55 db. Choice of 50 ohms or high impedance. List, 525.50

Model 718 Ceramic. Non -directional. For hand or table use. Ceramic generating element. Re- No Finer Choice than á - 0.1ez® sponse . 60-6000 cps. Output level -55 db. High impedance. List, $12.00 ELECTRO -VOICE, INC., BUCHANAN, MICHIGAN, U.S.A. WITH ...the quality line!... the performance line!... the full line!... the turnover line ! ... of TV and FM Antennas and Accessories that make you thrive- not just survive.

I JFD PAVES THE WAY TO SERVICE -DEALER PROFITS WITH... ANTENNA LINES THAT MAKE THE MASS -MARKET YOUR MARKET!

Outdoor or indoor, TV or FM, top, middle or low -end, JFD offers the industry's best construction and engineering advantages in all models, . .. all prices. :7 Each developed to perfection in the JFD Research Laboratories for precision electronic 1 by the same engineering team responsible -' components now serving in America's most advanced weapon and industrial systems. HI-FI HELIX COLORTENNAS Five unique types with high -gain Satellite dipole and helix design-each geared to today's black and white, tomorrow's color require- Ments-in natural or eye -appealing gold anodized aluminum.

AX ll 11 vXln1 AX911 AX711 \ AXSII VX911 $X711 RX51I

U PERFORMANCE -PROVED VHF STRAIGHT AND TELESCOPING FM ANTENNAS- JFD uncorks a AND UHF TV ANTENNAS-A TUBING-Whether it's JFD Hi profitable new service -dealer market complete line of over 100 antennas- Carbon Steel or Hi -Tensile Strength with the all -new FM Stereo Cone an- FM from the VHF Banshee, Fireball and Aluminum Straights ...or Armco Hi - tenna concept. Five gold anodized kits make every TV set 5 10 -element Yagis to the UHF Carbon Steel Telescoping Tubing, antenna and owner, every hi-fi owner a customer. Translator-a line that fills all cus- you can't buy better. tomer reception needs and your profit SEE YOUR JFD DISTRIBUTOR NOW! GET YOUR FAIR SHARE OF needs. TODAY'S 40 MILLION DOLLAR ANTENNA REPLACEMENT MARKET! JFD ELECTRONICS CORPORATION 6101 Sixteenth Avenue, Brooklyn 4, New York S' - F ' . ,

FAT IEb. -PROF TS.. . : I EXPLODES NATION-WIDE TV ANTENNA SALES DRIVE THIS SEASON WITH HUGE ADVERTISING SPECTACULARS!

OPEN -THROTTLE ADVERTISING PRESELLS 20,000,000 PROSPECTS!

COAST-TO-COAST ABC-TV ADVERTISING ON THE ALCOA PRESENTS!

MONTH -IN MONTH -OUT SATURATION CAMPAIGNS IN

Próyroxsintivmer, . 11Y tttt. PROGRESSIVE FARMER REM 1151'11 FARM ' FARM JOURNAL JOYwNf& I Tyr e: LOOK

_ __ TV GUIDE MAKING THE MASS MARKET JFD ANTENNA -CONSCIOUS! The most complete line of "DO-IT-YOURSELF" TV ANTENNA LOCAL TIE-IN CO-OP ADVERTISING TO HELP YOU CONVERT ANTENNA installations in a package - the sensational -selling ZIP -KIT! REPLACEMENT LEADS INFO SALES. ... starting at $10.75, list. NEWSPAPER MATS, RADIO -TV SPOTS, POP DISPLAYS THAT PUT MUSCLE INTO YOUR LOCAL SALES DRIVES.

EXACT REPLACEMENT TV AN- INDOOR TV ANTENNAS-First SERVICE -SAVERS -The TV acces- TENNAS - Thousands of service - in sales! First in performance! To- sory line with "heart." Fifty labor- dealers are earning quick, clean prof- day's longest and strongest indoor saving, money -making units to choose its in "portable" and "toteable" TV VHF or UHF antenna line! And with from-the trade's largest assortment antenna replacements by specifying good reason. None other offers the -assure picture -perfect performance the JFD brand-the perfect "factory - styling ... the packaging ... the mer- every time. For a handy profit -plus spec" match. Soon to be listed in chandising you get from JFD. standardize on JFD set couplers, an- Howard W. Sams Photofact Index. tenna couplers, switches, wave traps Another vital new service market. and lightning arresters. Pioneers in electronics since 1929 1 JFD International, 15 Moore Street, New York, New York JFD Canada Ltd., 51 McCormack Street, Toronto, Ont., Canada "TUBE INVENTORY DOWN JUL

...from using General Electric's PROFIT* Program. E That's the dollar -saving, income -building record of Chicago partners Robert Knudsen and Harold Russell! ...,,,-

* Programmed Replenishment OF Inventory Turnover . u VI T VV e're moving more tubes than ever, Knudsen and Russell add, "Now our with a stock one-third less. Inven- tube stock's geared to our needs. And tory turnover is that much higher, it stays that way-plenty of fast - which shows in increased profits." selling types, a minimum of slow The two busy partners of Tel-Rad movers. The distributor's weekly re- TV Sales -with -Service, 5839 Bel- order visit takes care of everything." mont Ave., Chicago, name this as No stock -taking or clerical work by their principal benefit from General the partners is involved. This saves Electric's new PROFIT" Program. them time for profitable repairwork.

Another big saving - space ! The You too can increase turnover and compactness of the General Electric boost income with General Electric's ;i, --: Inventory Rack means that a service new PROFIT* Program. Available dealer can do away with 50 to 60 feet with the purchase of tubes from your

of shelving. Furthermore, the at- G -E tube distributor. See him today ! tractive, organized display of tubes Distributor Sales, Electronic Com- gives the shop a modern and profes- ponents Division, General Electric sional -looking appearance. Company, Owensboro, Kentucky. 14' ' r r I ,s,....~I_9W-^

TEL-RAD'S SERVICE WORK doesn't stop while tube stocks are being checked. Here Richard Schlueter (facing rack in picture at left), salesman for < < ` aa.,t; tubes Melvin Electronics, General Electric tube distributor, in- spects the PROFIT* tube inventory for types to re -order. Schlueter does this job weekly, handling all routine and paper- r work-thus saving valuable for any sot! time for Knudsen and Russell.

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i OUR SALES ON THE INCREASE!"

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7rogress /s Our Most important Product GEN ERAL($ ELECTRIC News of the Industry for ALLEN B. DU MONT LABS. Elec- the tronic Tube Div. has named JOHN C. BEST WOLKE as Distributor Sales Mgr. INTERNATIONAL RECTIFIER in CORP. appointed ANGUS SCOTT as Mgr. of the New England Area office.

SERVICE SOLA ELECTRIC appointed JOHN B. O'DONNELL to the newly -created position of Distributor Sales Mgr.

BLONDER -TONGUE reports the appointment of HAROLD R. WALKER to the post of Chief Engineer of the Spe- cial Products Div.

CORNELL-DUBILIER will convert to a modern research and development laboratory its 100,000 sq.ft. plant at Norwood, Mass.

PHILCO CORP. and GENERAL TRANSISTOR CORP. have announced the signing of an engineering service USE and license agreement covering the AEROVOX manufacture and sale of transistors.

CERAMIC CAPACITORS! SENCORE has opened a new advertising and promotional campaign, mak- If you're particular about your service... ing the company the largest advertiser of test equipment in the serviceman's be particular about the capacitors you use. field. Aerovox offers you a complete line of rugged, dependable and versatile ceramic capacitors in UNITED MOTORS SERVICE DIV. every case style for every replacement application., reports the following two promotions: Choose S. W. ARCHER, Operations Dir., and from a wide selection of disk types G. SCOTT FOSTER. Asst. Gen. Sales in bypass -coupling, general purpose, hi -voltage Mgr. -Marketing. and temperature compensating. Three tubular types are available from general purpose to RAYTHEON CO. announced the following two appointments: temperature compensating to hi RICHARD E. -voltage units. KRAFVE, Executive Vice Pres.: and For those special applications you have cartwheels, HOMER R. OLDFIELD, group Vice standoffs and feedthrus in all sizes and values. Pres.-electronic components and devices, a newly created post. Your local Aerovox Distributor is your one -stop source of supply. Call on him today for any and RADIO CORP. named FRED M. ', all your capacitor needs. Ask him for your personal FARWELL to the newly created corpo- V copy of the latest Aerovox Servicemen's Catalog. rate staff position of Vice Pres., Mar- L VOW, keting. RCA distributors will be offered '`. .... 12 premiums in a new sales promotion program for RCA entertainment re- BUY 'EM BY THE KIT... ceiving tubes called "Operation Spec- two disk ceramic kits (AK -200 and AK -201 HS ) tacular." of popular replacement types in special 3 x 5 metal file drawers now available at your Aerovox GENERAL ELECTRIC announces the Distributor. Pay for only the capacitors following in connection with expansion and realignment and get the file cabinet of sales facilities serv- FREE. ing distributors in New England: JOHN WORSCHAK appointed an additional District Sales Mgr. covering a newly - established district including Me.. N.H., . A EROVXO9IRO ,C Vt., and the marketing areas of Provi- : ` " ` - 'CORPORATION - - --- < dence. R.I., Fall River, New Bedford DISTRIBUTOR DIVISION and Worcester, Mass.; CLAYTON RYDER will now cover the Boston area: and VICTOR NEW - 6 E:D P O R`.:1 , M A`8°,13 A C N u. S. SYZDEK, west- s T;T-S ern Mass. and Conn.

18 ELECTRONIC TECHNICIAN November, 1959 .e

,'._{ .71',;Y';n 7ii+r;i .t.:~M .' y1.~'pL¿L f a., : . . : ,t°Y'.r:`:,;C ,1'q't ! s ..!.. .. ti't11 I). r7~'1 lllf((! ' 1' I. 3 %!_: . ' f'1 { N.. .Ñl

in the ALL -NEW

dual -diameter speakers .. Never before such concentrated power! The secret is in Utah's brand new dual -diameter magnetic circuitry and dynamic Uni-coils. By ingeniously combining two magnetic material structures into one, Utah has produced the greatest power per pound in a loud -speaker since the advent of Alnico V. See the all new Utah speakers now -8" full range model D8LA and 12" full range model D12LA-they're as "hot" as a Jet Airliner!

r These new Utah speakers were hspired by the fabulous new Boe ng 7.37 Jet Airliner, now streaking coast :o =ast in Just 4.5 hours! Utal- speakers, too, Jaca no -e power per pound / ° feature Jet Ainine- slirr-line design to mee modern demands for reore ecmpact Sterec and High Fidelity aspications. _ IpUa1 °

fuller CIRCUITS MOTOROLA Semiconductor Products . Div. has named ALLEN SNYDER Ad- ' engineered for high fidelity" vertising & Sales Promotion Mgr. stereo IfYCON MFG. CO. has elected '.am/fm JAMES S. LAIDLAW, Vice Pres. and Gen. Mgr., and EDMUND W. BAKER, television Vice Pres.-Engineering and Chief En- h gineer.

'11$4/66 LING-ALTEC plans a S600,000 expansion of their plant in Anaheim, Calif., including one new manufacturing building which will provide approximately 65,000 additional sq.ft. of plant area.

PYRAMID ELECTRIC CO. has launched a new "Baker's Dozen" promotion whereby type S1-500 silicon rectifiers are offered on a multi -colored display card containing 13 packaged rectifiers.

ADMIRAL CORP. has promoted CLARENCE B. FLINN to the newly created position of Asst. Product Mgr., Electronics Div. JOHN L. MC DON- ALD. Dallas, was appointed Regional Sales Mgr. covering Admiral distributors in that area.

HOFFMAN ELECTRONIC Semicon- ductor Div. has appointed two men to new positions in its Sales Dept.: AL- BERT H. BINASH, Distributor Sales Mgr., and BENTON W. ROBERTS, Sales Engineer for the MULLARD electron tubes, new West Cen- liniversccJy re¿cgnizéd tral territory of Kans., Mo.. Neb.. Ia. for their advanced designs and,eliabiliy, offer a and S. Ill. selected range* of tubes fo- High Fidelity, AM/FM BENDIX AVIATION Television, CORP. has and Industrial Application;.- begun construction of a new 72,000 sq.ft. This selected range*, semiconductor products plant in which. -uses frame gitids, Holmdel, N.J. BENDIX RADIO DIV. s'pecial'glass, coiled heaters, bifilor windings, reports that sales of railroad and mobile two-way radio equipment for the special mica construction, =low hum and micróphony, first eight months of 1959 more than rugged construction, longer life are feafures doubled the figure for the same period Mullard in 1958. found in more expensive premium tubes. , At MULLARD these extras -are standard =- - HICKOK ELECTRICAL INSTRU- Trade Mark in the regular commercial production - MENT CO. is sponsoring a series of Mullard Ltd. transistor service clinics at key dis- AT NO EXTRA -COST. tributors throughout the country. The Discover the clinics will be informal, all -day ses- advantages of MULLARD tubes sions. Since there will be no formal in your program, equipment - new! - servicemen can attend at their convenience and will have the oppor- Detailed data and application engineering tunity for personal discussion of par-

assistance available upon request. - ticular servicing problems. Clinic dates will be announced by distributor mail- ings. "Circuits for Audio Amplifiers",is a new-MULLARD publication in which the wide range of MULLARD high quality audio circuits is presented conveniently in one book. Four introductory chapters ore devoted to theoretical and practical considerations of high quality sound rearoduction with monophonic INTERNATIONAL RESISTANCE equipment or with stereophonic systems. The west of the book comprises CO. has announced the appointment of circuit descriptions, constructional details, and some performance %ores of 12 MULLARD circuits. These circuits include well-known MilILARD designs, WALTER WARE SLOCUM as Pres. same modifications and improvements to these a s v circuits, and number of CHARLES WEYL became Chmn. of the completely new ones. Only 52.50 Irani your dealer or b1. mail from our - Technical Services Division. Bd. CHICAGO TELEPHONE SUPPLY CORP. and IRC reached a marketing agreement whereby IRC becomes sales INTERNATIONAL ELECTRONICS CORP.- rep for CTS industrial and military 81 SPRING ST., NEW YORK 12, N.Y. variable resistor products in five major marketing areas. 20 ELECTRONIC TECHNICIAN November, 1959 ( / ti; t U , f. moo-.a _i

I Verdict: pro¿

/-ZGollardt ty r r stereo ."-. record players are innocent of rumble,

wow, flutter .

or any noises that interfere with enjoyment of music

J The Constellation, Model TC99-559.50 The Contirtertal II, Model TSC840-$49.50 The Coronation II, Model TSC740-$42.50 á The Conquest II, Model TSC-640-$38.50 1 ' r ROCIBÁR

Gir,Ct71 .

1.1

Transcription Turntable, Model 4TR200-$49.50 Manual Player, Model TP-59-$29.95

Every Collaro stereo record player is built with typical British attention to every detail. They are precision engineered and rigidly tested to give truly professional performance and the ultimate in operating convenience. Here are some of the more important features that make Collaro the logical choice for stereo or monophonic records. Performance specifications exceed NARTB standards for wow, flutter and rumble - with actual performance test reports accom- flywheel panying each model TC-99. Extra -heavy, die-cast, non-magnetic turntables (weighing up to 81/2 lbs.). Extra -heavy weight is carefully distributed for reduction effect and smooth, constant rotation. Shielded four -pole motors are precision balanced, screened with triple interleaved shields to provide extra 25 db in magnetic hum pick-up. Detachable five -terminal plug-in head shells (on TC-99, TSC-840, TSC-740, TP-59) provide two completely independent circuits, guaran- teeing ultimate in noise reduction circuitry. Transcription -type stereo tonearms are spring -damped and dynamically counterbalanced to permit the last record walnut, and on a stack to be played with virtually the same low stylus pressure as the first. All units are handsomely styles, available with optional blond base. There's a 4 -speed Collaro stereo record player for every need and budget! Prices slightly higher in the o mahogany finished bases or unfinished utility or West. For free catalog on the Collaro line, write to: Rockbar Corporation, Dept. ET -1 Mamaroneck, N. Y. ('Not shown. Similar in appearance to The Coronation.) lor

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"It's good business to use this 96 -day Re- pair Band," says Ken Rodrigue. "We find it helps the customer feel, more than ever, that he has received full value from his service dollar." "Most Constructive Step in the Industry"

"The new Raytheon "In addition, Raytheon backs the Bonded Dealer Bonded Dealer Program is Program with national consumer advertising. And the best step yet towards the Raytheon distributors supply local direct mail identifying competent and advertising support. The average dealer and reliable service organ- couldn't afford this. Speaking for ourselves, we've izations. tied into these programs with great success. "It really goes a long way "Of course, we know that advertising promises in assuring the public that have no value witl..out quality products to hack its investment in qualified them up. Nine years of Raytheon tubes and CRT's service is the best means have proved to us that a dealer can count on the -maybe the only means- Raytheon brand name. of enjoying trouble -free radio and TV. "Congratulations on the whole Bonded Dealer "And this assurance is actually put right in their Program-we know that it's helping us to increase hands with the Raytheon 90 -day Repair Bond. profits."

K. J. Rodrigue, President Rodrigue's Radio & Television, Inc. Milford, Conn.

Cash in! If you haven't signed up as a Raytheon Bonded Dealer, call your Raytheon Distributor today to march with the profit parade.

-I `1ti

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mar " - rf"7s ..,.rr1s T_

"We average over 6000 service jobs a year," says Ken. "As Milford's large4 servicing organization we have "'ro achieve this kind of volume we depend on the skill counted on Raytheon quality since the day we opened," and efficiency of our service technicians and top-quality relates Ken. "In addition I like the 24 hour service I Raytheon Tubes." get from my Raytheon distributor."

RAYTHEON COMPANY DISTRIBUTOR PRODUCTS DIVISION

23 ELECTRONIC TECHNICIAN November, 1959 . t

Dependability is a built-in feature of all Delco Radio Service Parts!

Take speakers, for instance. Delco electronic speakers are built rugged for long life and resistance to extreme weather conditions. You can rely on them for exceptional power handling and rich distortion -free tone. ELCO Delco's popular 8 -inch "Hi -Fi" speaker, No. 8007, provides the most power and tonal range for the money. Designed 71i:aA:.ILITY for replacement use and high fidelity audio systems, it's a good, fast seller with price and quality appeal. 1 For speakers, transistors, !'DIO transformers and other fine parts for Delco and other radios, see your Delco Electronic Parts Distributor. He carries the complete line. Other extras you get with Delco are Wide selection of special application parts Complete technical training program Effective warranties Dealer identification signs. Dirision of General Motors Kokomo; Indiana Stock with Delco Electronic Parts-more dependability and reliability for your customers, more profit for you. Available everywhere through (tJ Electronic Distributors U.MIYI o.ou ,nn_I associated with _w""

24 ELECTRONIC TECHNICIAN November, 1959 For Checking Miniaturized Equipment, Pyramid's Capacity - Ratio Reps & Distributors Model RC -1 New Resistance- Bridge Tester. Budget priced ... outstanding quality instrument ... the RC -1 saves you both time and money. Precision -engineered, Pyramid's new model RC -1, Resist- RAY R. HUTMACHER ASSOC. has ance -Capacity -Ratio Bridge Tester has a special low MENEZES been joined by WILLIAM voltage bridge and stable vacuum tube amplifier for safe in the firm's Ill. and Wis. territory. testing low voltage electrolytics such as commonly used ENTRON reports the appointment of in transistorized receivers. NELSON E. THOMAS & ASSOC. as Pyramid's RC -1, Resistance -Capacity -Ratio Bridge Tester Southern manufacturer's rep. is a functionally designed, sturdy, compact, lightweight unit, ideal for use by technicians, servicemen and en- EITEL-MC CULLOUGII INC. ap- gineers in radio, television (color as well as black and pointed FRED F. BARTLETT & CO. white), industrial electronics and all related fields. field reps ín the mid -Atlantic area for their electron -power tubes. PYRAMID MODEL RC -1 FEATURES: Special 3 volt amplifier for checking low voltage elec- R. EDWARD STEMM organization trolytics used in miniaturized equipment such as tran- has been joined by JAMES O. SCHOCK sistor radios, etc. as a Sales Engineering Agent covering Ranges-from 10 mmfd. to 2000 mid. the S. half of Ind., Ill. and St. Louis, Capacity Mo. and Louisville, Ky. Resistance-from .5 o'ims to 200 megohms in 4 ranges. Ratio Test-provides quick reactance or resistance INTERNATIONAL RECTIFIER two capacitors, inductors or resistors CORP. Distributor Sales Division ratio between any 1 20 to 1. It can be used also to named S. R. ROSS, INC. authorized -range: .C5 to and industrial distributor in the Salt Lake determine turns ratio of transformer windings within City area. this range. Leakage Tests-handles all types of capacitors at rated ERIE RESISTOR CORP. Electronic voltages between 0 and 500V DC. Div. has named KIMBALL Distributor from .1 mfd to DISTRIBUTING CO. and ALMO .Power Factor -0 to 60% (on capacitors RADIO CO. distributors of Corning 2000 mfd). glass electronic components. *Capacitor Test Voltages-variable between 0 and 500V DC in 17 steps. TELETRONICS LAB. appoints three PRICE: Dealer Net-$44.95 new reps to handle test equipment For further information about the RC -1 see your Pyramid products: JOHN B. LIGHTSTONE, ¡ 101P101Pp MCIO. distributor or write for comprete technical data to: upper N.Y. state; ELECTRO-MEC 1!). ASSOC., Michigan; and J. K. DOOLEY Pyramid Electric Company, Union City, N. J. EXPORT: / 458 ay, N. Y. 13, N. Y. CANADA: Wm. Cohen, CO.. Wash. and Ore. ., Broady ltd. -7000 Park Ave. Montreal. .10R CITY. ALLEN B. DU MONT LABS. names the following two distributors of indus- BURTON BRO NNE, New York trial CRT's: H. L. DALIS, INC., N.Y.C. metropolitan area; and FEDERATED PURCHASER CORP., Newark, Essex and Union Co. market area. G 1vfoDLLTc:t GPApUICE RE9SkrCE 3RDct ELECTRONIC REPRESENTATIVES ASSOC. will present a new industry to,11 award for excellence in sales management to four outstanding sales managers at the ERA Convention in January. Nominations by ERA members of sales managers in each of the audio, distríb- . ' -.>I ` utor, industrial components and instru- PYRAMID ment field will be judged by an Lt. impartial group. RANGE oro FJ

[MVIC1M/11

PYRAMID ! ELECTRIC CO.th it".0.-ífrsl c

ELECTRONIC TECHNICIAN November, 1959 25 OAYE GARROWAY JOHN PAYNE &ALE STORM BOB CUMMINGS "Today" "Restless Gun" "The Gale Storm Show" "Love That Bob" NBC-TV ABC-TV ABC-TV ABC-TV

ri'-"w. 3 "4 S for the CHANNEL MASTER®Y

-4 STARS" -recognized symbol for superb performance.

-4 STARS" - going all-out to help you sell more antennas. Who doesn't recognize these top -rated TV stars? Their audience numbers millions. And hard-hitting commercials are telling these millions ... over and over again ... to replace their old, worn-out antennas with the powerful Channel Master T -W. On network TV ... in the top farm publications ... in best- selling mass magazines ... Channel Master is using the power of all-out National Advertising to help you do a bigger, MORE PROFITABLE, antenna installation business. That's why it makes good sense for you to promote and install the Channel Master T -W ... the one antenna that has never been equalled for brilliant performance and rugged construction.

3 2 FULL TOP NEW BEST-SELLING NETWORK DISPLAY FARM GENERAL TV POSTERS PUBLICATIONS MAGAZINES

FOUR TOP SHOWS The Progressive Farmer The Saturday

2 MAJOR TV Evening Post Successful Farming NETWORKS SEE,Ti S R5 AT// Coronet Tr t BR/GI-11'0r . TWO, 210 TV STATIONS Farm Journal CHANNEL MASTER- ,!1.--;

kic.cNgy414ELT11 WOW. !look Available from your Channel Master distributor. CHANNEL MASTER works wonders in Sight and Sound I CHANNEL lifÍSTER advertising works. IFIcouriel the Clock ...to make friends and customers for the full line of Channel Master products.

Aluminum and Steel Matting 1". IN

I ' \ i é women Indoor and outdoor antenna.

nun IT>, 2 -set couplers

I as; "- .vp /4\ 14, 'lb Automatic and compost rotators

4 1.----- 1 5- - - -.,, .. t emulators. mounts, and hordwore k , ANIMA Tuner

.. .--.,-,.,.;;;:".

Ili ,,., , ... ,, . .--

".,'''..-!: , ::.*::: ' '''' ' Transistor radios

Stereo twistable Miestnel Speakers High Fidelity Amplifiers 77- '1 Electron Tubes

' N. rl Get the 119 gi=lj profit story. A ' Call your Chanel Master distributor today.

CHANNEL MASTER CORP_ tvILtf, . r. eggry~ ~ow 49. RCA TEST EQUlPME1 Catalogs & Bulletins ":fhe professional's touch''== SEMICONDUCTORS: Over 2,100 types of transistors, diodes and rectifiers, produced by 16 leading domestic manufac-

' turer's, are listed in the fifth edition of WO-91A 5 -INCH WR-69A the firm's semiconductor directory. COLOR -TV Al- TELEVISION/FM lied Radio Corp., 100 N. Western Ave., J o OSCILLOSCOPE ,P _ - SWEEP GENERATOR Chicago 80, USE: high-performance, Ill. (ELECTRONIC TECH- USE: for visual align- wideband oscilloscope NICIAN B11-1) * v ment and trouble ideally suited for color -TV shooting TV of rf/if/- ' black -and -white vf TV, and circuits and other a o a 4 other electronic applica- electronic equipment. IF/Video frequency lions. Dual bandwidth (4.5 PHONO CARTRIDGES: An 8 -page catalog, ranges 50 Kc to 50 Mc, TV channels 2 to 13, Mc, 0.053 volts rms/in.) (1.5 Mc, 0.018 volts plus FM range PF -285 provides a -88-108 Mc. Sweep width 0-12 rms/in.). Internal calibrating voltage and cali- cross-reference Mc or more. Output level -0.1 volt or more. At- brated graph screen. Includes special direct/low chart for exact replacement of more tenuation ratio 60 db or more below maximum cap shielded probe and cable. $239.50' (in- than six million phono output. $295.00' (including all cables, instruc- cludes ground cable, insulator clip, instruction cartridges. Both tion book). book). CBS-Ronette and Columbia CD cartridges are listed. Technical specifications are included. CBS Electronics, WV -98A SENIOR Danvers, Mass. (ELECTRONIC TECH- WR-99A VOLTOHMYSTS NICIAN B11-2) CRYSTAL - USE: for making accurate CALIBRATED ac and dc voltage meas- MARKER urements as well as INDICATOR LIGHTS: GENERATOR I measuring resistances A new 4 -page, 2 - from 0 101,000 megohms. color, brochure, Form L-162, covers 4 USE: to supply a fun- I Measures peak -to -peak damental frequency values of complex waveforms. Ruggedized, die- series of subminiature indicator light rf carrier of crystal cast 1.' accuracy for aligning aluminum case. Large, easy -to -read 61/2 - assemblies designed to mount in a and trouble -shooting I inch meter! A fine VTVM for electronic techni- color, black -and -white TV, FM receivers and cians and engineers! Includes special dc/ac- clearance hole from the front of the other electronic equipment operating in 19 Mc I ohms shielded probe and cable. $79.50' (com- panel. Dialight Corp., 60 Stewart Ave.. to 260 Mc range. $242.50' (complete with out- plete with ground lead, alligator clip, instruc- put cable, two phone tips, instruction book). Brooklyn 37, N. Y. (ELECTRONIC 1 tion booklet). , TECHNICIAN B11-3)

1 -Tl WOMATIC110A ELECTRICAL WIRING DEVICES: Over 1,500 1 e AUTO electrical wiring devices are shown in WR-70A RF/IF/VF ELECTRON -TUBE a new 60 -page catalog. All products are MARKER ADDER TESTER grouped in categories and cross-in- USE: To be used with USE: especially for dexed. Eagle Electric Mfg. Co., 23-10 WR-69A, WR-99A or yw.f TV and r general Bridge Plaza South, similar ; r electron -tube serv- Long Island City 1, electronic equipment. Elimi- ice testing through automatic punched -card N. Y. (ELECTRONIC TECHNICIAN nates possibility of waveform distortion during selection of correct test conditions on wide B11-4) visual alignment techniques by adding markers variety of tubes. Checks vacuum -tube rectifiers after the rf signal is demodulated. $74.50' under high -current conditions. $199.50' (com- (complete with cables, instruction book). plete with 263 punched cards, 24 blank cards, card punch, instruction book). ELECTRONIC KITS: Announced is a new 1 66 -page 1960 catalog of electronic equipment in kit form. Included, with many WR-46A VIDEO new items, are high fidelity compo- WR-498 RF SIGNAL nents, test instruments and marine DOT/CROSSHATCH GENERATOR GENERATOR equipment. Heath Company, Benton USE: for alignment USE: a "must" for and signal tracing of Harbor, Mich. (ELECTRONIC TECH- making color -TV AM/FM receivers, NICIAN 811-5) static and dynamic lowfrequency signal convergence adjust- tracing and alignment of TV of/if amplifiers. ments in the home or shop. Derives sync from Six ranges -85 Kc to 30 Mc. Internal 400 cps station -tuned TV set and reinserts highly stable modulation. Low rf signal leakage! DC blocking ELECTRONIC COMPONENTS: Bulletins video dot, bar, or crosshatch patterns to pic- capacitors at rf and of output terminals prevent ture tube grids or video amplifier grids. damage to instrument or external circuits. available, covering a new series of pre- $179.50' (complete with cables, instruction $79.50- (complete with shielded cable for rf cision electronic components, are: x217 book). and of output, instruction book). -Differential variable trimmer capacitors; #218-Miniature glass differential sealcap trimmers; x219-Miniature W R-61 B PLUS a complete line of test equipment ac- split stator trimmers; #220-Miniature. COLOR -BAR split stator sealcap 6 cessories-video multimarkers, TV isotaps trimmers and #221 - GENERATOR -MA X-C trimmer. JFD Electronics USE: for checking and bias supplies, various probes and d f Corp., 1462 62nd St., Brooklyn, N. Y. 4 f - overall operation of cables including high -voltage types. Add . color -TV receivers (ELECTRONIC TECHNICIAN B11-6) and a "must" for ad- "the professional's touch" to your service justing and trouble shooting color phasing and matrixtng circuits. -see RCA's full line at your Authorized RCA Generates signals for producing 10 bars of dif- POWER SUPPLY: Bulletin #15-7 features ferent colors simultaneously. $295.50' (com Test Equipment Distributor! application, circuitry and plete with cables, TV -input adapter, instruction specifications book). 'User Price (Oplionol) of a new high -precision instrument: Model 301 d -c voltage standard and null meter. Kin Tel Div., Cohu Elec- tronics. 5725 Kearny Villa Rd.. San RADIO CORPORATION OF AMERICA Diego 12. Calif. (ELECTRONIC TECH- Electron Tube Division Harrison, N. J. NICIAN B11-7)

(Continued on page 30)

28 ELECTRONIC TECHNICIAN November, 1950 lq

etio§,1,4,1

I A Y ' ' B .? _ - `t- RECORD D fE'S 2 /D E ` 400 T P LA y - 4 f' 4 yyÓ

/yQUARTER TRqCk 1 AL F TA CA( - . STE _ I e" TRAChf RED -5..` - S T EREO . _ ' . . y . . - -.. E GOT 1 ü

ONLY and ONLY --M has "ADD -A -TRACK" the MOST Practical, the MOST Useable, the MOST Unusual Feature ANY Top Tape Recorder has to Offer! WHAT IS "ADD -A -TRACK"? "Add -A -Track" is an IMAGINE the unlimited applications of this exclusive feature exclusive V -M feature that allows the user of a V -M 'tape-o- to teaching and learning... in Education ... in Business... in In- maric'® Model 720 to record vocal or instrumental music or voice dustry, in addition to its appeal for pure "home entertainment"! alone. Any tape recorder can do that, you say? Wait just one V -M Model 720 is a NEW FOUR -TRACK TAPE minute! After the user does this, he simply rewinds the tape and, while listening to the first recording, records the musical accom- RECORDER with the "TOP TWELVE" SELLING paniment or "second" voice on another track of the tape, which FEATURES in the playback will be heard as a simultaneous recording. PLAYS ALL STEREOPHONIC TAPES (2 -track, 4 -track, either HOW DOES IT WORK? Suppose you play the piano sracked or staggered) how you would sound playing a duet and would like to hear RECORDS AND PLAYS -BACK MONOPHONICALLY with yourself? here's how: With V -M's Model 720, you simply -QUALITY RE- set up for regular recording, play the number, rewind, turn the CATIIOPTIC TUNING EYE FOR PROFESSIONAL SELECTOR knob to ADD -A -TRACK and then record your CORDING RESULTS accompaniment. In the playback, the first recording is heard A HIGH QUALITY, HIGH FIDELITY MICROPHONE (included) through an accessory amplifier -speaker (as V -M Model 166) BLUE -GRAY LEATHERETTE CASE --COMPLETELY PORTABLE while the second recording is being heard from the tape recorder list ` itself. Pre-recorded "Add -The -Melody" tapes are also available -ONLY $225.00t on the market. MODEL 166 AUXILIARY AMPLIFIER-SPEAKER-S75.00í list

tSlightly higher in the West

AND...V-M Puts You in the Tape Recorder Business... No costly inventory investment... a complete "sales ac- You'll immediately spark real interest and create profit- tivity" package includes display fixtures, point -of -sale, able sales with this colorful counter -high V-111 Tape Re- promotions... EVERYTIHING! V -M's giant "Family corder Sales Center. Versatile, utilitarian, hard-hitting Pleasure Package"-an irresistible consumer buying in- display fixture has space for a V -M tape recorder, plus centive. It's a complete V -M created kit of entertaining extra profits in &splay of V -M rape editing kit and ac- and educational "things -to-do" with a tape recorder for cessory mike stand. It effectively displays V -M "Family the whole family. BIG "l low -To -Do -It" Manual included. Pleasure Package." Stay on the "Right Track" with "ADD -A -TRACK"... ONLY from V -M! th~Iiyour choice for music is of Music® V -M CORPORATION BENTON HARBOR, MICHIGAN WORLD FAMOUS FOR THE FINEST IN RECORD CHANGERS, PHONOGRAPHS AND TAPE RECORDERS Now ...from Sonotone- (Continued from page 28) SEMICONDUCTORS: Announced is a new semiconductor directory of germanium and silicon transistors, diodes and rectifiers. Major manufacturers and types are numerically listed with descriptions and applications. Lafayette Radio, 165- 08 Liberty Ave., Jamaica 33, N. Y. 4 Big (ELECTRONIC TECHNICIAN B11-8)

COMPONENTS: Bulletin #59-4 is a 4 - page, 2 -color, catalog describing and giving specifications for sockets, plate caps, grid grips, terminal components Improvements and assemblies for radio and electronic applications. National Radio Co., 37 Washington St., Melrose 76. Mass. in the quality stereo cartridge (ELECTRONIC TECHNICIAN B11-9)

CONNECTORS: A colorful, 4 -page, bro- Sonotone 8TA cartridge replaces chure provides a listing by insert arrangement and of ms 8T as industry standard number Cannon E/R connectors, meeting MIL -C -5015C v 1, and MIL -C -5015D. Schweber Electron- The new Sonotone 8TA ics, 60 Herricks Rd., Mineola, L. I.. cartridge gives greater than N. Y. (ELECTRONIC TECHNICIAN ever stereo performance... B11-10) has 4 big extras: TEST INSTRUMENTS: The following aoar- tions to the firm's line are covered in fuller, smoother frequency response a one -page brochure; transistorized ONLY voltmeter; transistorized signal gener- higher compliance than ever before ator; vibration meter; vacuum -tube lighter tracking pressure voltmeter; audio response plotter; am- practically eliminates dust pile-up plifier and microsource. Southwestern Industrial Electronics Co., 10201 West- heimer Rd., Houston 27, Texas. (ELEC- Sonotone 10T unitized stereo at TRONIC TECHNICIAN B11-11) lowest price ever New lOT cartridge sells at record low price of CAPACITORS: Two 4 -page illustrated $6.45." And it covers the complete high fidelity Product Engineering Bulletins, Nos. range. 10T's unitized construction makes it easi- A-110 and A-115, cover subminiature est to install, easiest to replace. Low price means glass -to -metal sealed tubular capacitors more sales-more profits. types AQF and TQF respecti ely. The Bulletins contain a complete list of military and commercial ratings, perform- SPECIFICATIONS ance characteristics and test specifications. Astron Corp., 255 Grant Ave., 8TA 1 OT East Newark, N. J. (ELECTRONIC Frequency Response Smooth 20 to 20,000 cycles. Flat from 20 to 15,000 cycles TECHNICIAN B11-12) Flat to 15,000 with gadual ± 2.5 db. rolloff beyond. Channel Isolation 25 decibels 18 decibels Compliance 3.0 x 10-6 cm/dyne 1.5 x 10-6 cm/dyne Tracking Pressure 3-5 grams in professional 5-7 grams arms 4-6 grams in changers Output voltage 0.3 volt 0.5 volt Cartridge Weight 7.5 grams 2.8 grams Recommended Load 1-5 megohms 1-5 megohms Stylus Dual jewel tips, sapphire or Dual jewel tips, sapphire or diamond. diamond.

including mounting brackets Sonotone makes only 6 basic ceramic cartridge models ... yet has sold over 9 million units... used in over 662 different phonograph models. For finest performance, replace worn needles with genuine Sonotone needles.

Electronic Applications Division, Dept. CT -119 SonotoneJ. ELMSFORD. NEW YORK

Leading makersof fineceramiccartridges,speakers, tape heads, microphones, electronic tubes. "It's OK now. We had put on each other's In Canada, contact Atlas Radio Corp., Ltd., Toronto glosses by mistake."

30 ELECTRONIC TECHNICIAN November, 1959 for ALL TV instillation needs! LOOK TO THE FOREMOST'NAME at a--better price. Practically all ROHN IN THE COMPLETE LINE -_OF HOME -TV, products are available in the finest of fin- AMATEUR AND COMMUNICATION ishes ... hot -dipped galvanizing! Rely on TOWERS, PLUS A COMPLETE LINE the dependable name for ALL your needs OF INSTALLATION NEEDS.- --ROHN ... today one of the largest this . ' YouJl find thot'the ROHN line is -.manufdcturers of a complete line of complete. It gives you better -products type equipment.

pow aR fc.))

No. 25 The ROHN No. 25 tower is one of the finest ever designed ... a full 33% stronger and more durable than "similar sized" tcwers. This is achieved by amazing ¡.R zig-zag cross bracing design M r:;.. - combined with highest grade steel and heavy-duty steel 1111114Mj4 side -roil tubing. This superior strength means that this tower Fold -over The No. 25, can ordinarily be installed self- as well as heavy-duty No. 40 supporting to 50 feet or guyed communication tower, con be to 200! It is truly the finest tow conversed into "foldover' er of its kind for home televi- towers for amateur use ... the sion reception. only tower of its kind. They let No.61 you work "on the ground!" This ROHN tower features the well-known "magic triangle-, Communications the cross -bracing construction FIVE complete lines of commu- that is unequalled in strength nication towers are available and durability. Also ovoiloble Fi to fulfill practically any need, to self-supporting, or guyed including o 130 foot true about 150 feet. heavy-duty communication tower that is completely self- sent on request! supporting and guyed models Complete communications catalog up to 600 feet! MI?) laTA 911011n WM' n; n " g:. - e'a/ . ' I ,. ' II`<- . ,. roof mount Telescoping masts-Unexcelled in design, Roof towers-Available._ in 10, 5 and 3 Tubing-Just whot you wont: 6" exponded Bases-Wide variety of bores. structure and strength, with several excite foot heights. Most of thews ore collapsible end with %" toper to form o solid locking Special locking feature. Also ovoiloble is 'live features, All popular sizes, heights and for easy shipping. Ideal in use-o ROHN joint! High carbon steel. Available 5, 10 cost oluminum roof mounts and many other weights ovoiloble. "big -seller". foot lengths, I s/.", 1 Vs" dsometer, 16 and types. 18 gouge.

Get the full and complete catalog from ROHN Manufacturing Company your ROHN representative. 116 limestone, Bellevue Peoria, Illinois Pleose send me literature on full line of RCHN products. ROHN Manufacturing Company Firm Name Title 116 LIMESTONE, BELLEVUE PEORIA, ILLINOIS Address

City Srote

ELECTRONIC TECHNICIAN November, 1959 31 (SPRtGeriEl:ONalltemom ,0.Y...,.,a.vivo»

1.117 II MAIM ffit TRY

. N: 54,.N,;.

THE ,., .. .o .,,, ,.,,,. Will NN lN. Y TO -5 tv,_n^ w., TEL-OHMIKE® capacitor analyzer measures all 4 . . plus

1 2 3 4 extra CAPACITANCE POWER LEAKAGE INSULATION feaiture FACTOR CURRENT RESISTANCE TURNS RATIO

Measures up to Power factor of Leakage current of Insulation resist In addition to its s+; 2000 µf in five ov- electrolytic capaci- electrolytics is ance of paper, ce- function as a com- erlapping ranges tors is measured by measured directly ramic, and mica plete capacitor an- . . . including an the highly accurate on the meter, with capacitors is read alyzer, the TO -5 accurate 1 to 100 bridge method. exact rated voltage directly on meter also measures the µµf range, exclu- Reads up to 55% up to 600 v. ap- ... up to 20,000 turns ratio of sive with Sprague. in three ranges for plied from contin- megohms. power and convenience in uously adjustable audio measurement. power supply. transformers. Two ranges - 0-6-60 ma.

SPRAGUE'S TO -5 TEL-OHMIKE Capacitor Analyz- TO SEE THE TO -5 TEL-OHMIKE IN ACTION ... er is one of the fastest and surest ways of measuring ... CALL YOUR ELECTRONIC DISTRIBUTOR TODAY! capacitance, power factor, leakage current, insulation This 4 -in -1 test instrument is only resistance, and 8%" high, 14%" wide, turns ratio. The compactness and ac- and 6" deep ... weighs a mere 121/2 pounds. The complete curacy of this easy -to -use instrument make it ideal for price for ... general industrial laboratory testing. MODEL TO -5 (115 VAC/50-60 cy) .. Only net The jumbo rotating dial makes meter reading easy. $8390 Also available: Model TO -5X for 115-230 V/25-60 . net You don't have to your cy $89.90 turn head to read this bridge. Model TP-5RM for rack mounting 393.90 net Special color -keyed pushbuttons permit instant range selection ... and allow automatic safety discharge of capacitors after testing. Magic -eye tube simplifies bridge balancing for capacitance and power factor measurements. SPRAGUE' world's largest capacitor manufacturer

SPRAGUE PRODUCTS COMPANY, DISTRIBUTORS' DIVISION OF SPRAGUE ELECTRIC COMPANY, NORTH ADAMS, MASS.

32 ELECTRONIC TECHNICIAN November, 1959 ONIC TECH ILIA

"Don't be a V I DIOT !"

That's the screaming headline of an aggressive "Your most reliable guide is the manufacturer's war- and advertising campaign in mass consumer magazines. ranty tag that says a particular tube is New ... Its purpose is to convince TV owners of the desir- has all -new parts and all -new glass." The fact is ability of buying replacement picture tubes using that a consumer's most reliable guide is the reputabil- new glass envelopes. The advertiser is Kimble Glass ity of the manufacturer, regardless of whether the Company, a subsidiary of Owens-Illinois. glass is new or used. The ad defines a "Vidiot" as a person who pays the Though glass manufacturers have tightened their new price for a rebuilt picture tube. production tolerances, we do not believe that they can We believe that the consumer could benefit by show any measurable improvement in picture per- proper education. This ad does not do it! formance over tubes using glass reclaimed by a high On the contrary, it is in poor taste and raises some quality tube manufacturer. The electron gun in good questionable implications. No doubt a number of rebuilts is brand new, and frequently the screen is not people find it offensive, if not downright insulting, to too. Glass is a most durable material, if it does be told that they are idiots for not recognizing the crack. That is why milk bottles are used and reused difference between new and rebuilt picture tubes. many, many times with no deterioration in perform- It is doubly annoying that the consumer's irritation ance. should once again be directed to something relating It is probable that set manufacturers would use to TV. There is the possibly unintentional implica- rebuilt tubes if Government regulations did not re- tion that the technician pulled a fast one. quire the elimination of the new label from the entire The ad carefully refrains from saying explicitly that set. a picture tube using new glass actually performs So the next time one of your customers asks you better than one with reclaimed glass. However, the about new and rebuilt picture tubes, let him know ad does imply to the consumer that it is better. Com- that he can obtain excellent performance from a re- ments such as "They look alike ... but they are not built as long as it was made by a high quality manu- alike," are used. facturer. For those who want an all -new tube, they We do not begrudge Kimble the right to sell as may be obtained at higher cost. many picture tube envelopes as they can. And they In any case, it does not seem like good business to certainly are correct in saying that the consumer has call a customer by a name which impugns his mental a right to know whether or not the glass is new. normality. We propose that Kimble correct the But they are twisting the facts when they say, abuses noted.

ELECTRONIC TECHNICIAN November, 1959 33 rimiug t e

BUY AMERICAN, was the keynote of a talk by widely known electronics industry executive, Helen Quatn. Mrs. Quam cited what she termed ruinously low prices quoted on Japanese -made components delivered in this country, resulting in real hardship an ong American workers. Mrs. Quam further pointed out the economic tragedies that might result in future years if the American brand products are not supported. JAPAN IS AIDING AMERICA, ís the substance of a declaration by a delegate from Japan. In addition, an official of the 80 -year -old giant electric industrial company, Toshiba, said, "... many prominent American manufacturers are directly affiliated with our large Japanese industries and, in fact, are substantial stockholders." Stating that last year U.S. exports to Japan were S829,488,593, while U.S. imports from that country amounted to S673,- 951,285, he commented, "It is obvious that American industry and American workers are the greater beneficiaries." A TV CAMERA may he watching you. Whether you walk into a department store, hank or warehouse, there's a chance that your movements are under sur- ELECTRONIC PRINTER veillance of a closed-circuit TV camera. The Burns International Detective Agency, said to be the world's largest, reports that industry is turning increasingly to g*es ;r1 r.. TV, and electronically -tripped cameras for protection against thieves. The famous detective agency established an electronics division three years ago and the agency's president says it is growing fast.

BUILT-IN TIMERS for TV sets are meeting with much consumer interest, reports a GE executive. In a survey conducted by the Telechron Timer Market- ing Research Unit, 76'/ of the people with bedroom sets said they enjoy regular night-time viewing: 51% of these night viewers reported they fall asleep with the set on; 59,4 stated they would buy a portable equipped with the automatic shut-off.

TECHNICIANS' TRAINING AIDS program approved by the EIA. The initial step of the new program will involve preparation of films and a manual on customer relations and salesmanship, geared towards the service technician. A spokesman said that the independent service industry will benefit by providing technicians with an opportunity to learn the fine points of handling customers and selling services.

IBM's new 1403 Printer gets an electronic boost with a high-speed TRANSISTOR factory sales during the first seven alphabet chain. In operation, the chain travels horizontally across the months of this year more than double last face of paper forms at a speed of 90 inches year's a second. A fixed row of comparable A electronically -timed hammers is in line with the whirling chain. As period sales. total of 42,128.291 tran- the printing chain moves, the impact of hammers against individual sistors were sold January through July, according to type numbers and letters causes them to print in precise registration. the EIA, for a dollar total of $115,432,090.

34 ELECTRONIC TECHNICIAN November, 1959 I ictu

ELECTRONIC RETAIL INVENTORY control CALENDAR OF COMING EVENTS should be coming into its ownre before long. ane sys- Nov. 17-19: New England Research & Eng. Meeting, Boston Com- tem would tie a simple computer to the cash regis- monwealth Armory, Boston, Mass. ters of various department store sections. As sales Dec. 1-3: Eastern Joint Computer Conference, Stoller Hotel, Bos- are registered, they will simultaneously be totaled ton, Mass. at the computer for a composite store -wide inventory Dec. 3-4: PGVC Annual Meeting, Colonial Inn and Desert Ranch, picture. St. Petersburg, Fla. Jan. 11-13: Sixth National Symposium on Reliability and Ouality Control, Statler-Hilton Hotel, Washington, D. C. Jan. 25-28: Plant Maintenance & Engineering Show, Convention EDUCATIONAL TV takes to the air. The Ford Founda- Hall, Philadelphia, Pa. tion and a group of leading educators announced a Feb. 3-5: Professional Group or Military Electronics, 1960 Winter seven million dollar experiment to expand the benefits Convention, Biltmore Hotel, Los Angeles, Calif. of educational TV by planning to have a DC -7 airplane Feb. 11-13: Electronic Representatives Association, First Annual Con- venti3n, Drcke Hotel, Chicago, Ill. fly in a 41111 mile diameter circle, relaying programs to Mar. 21:24: IRE National Convention, Coliseum and Waldorf Astoria viewers in six Midwestern states. The programs could Hotel, New York, N.Y, reach five million viewers.

SMALL BUSINESSES JEOPARDIZED by tax laws was UNCONSTITUTIONAL is the claim of plaintiffs at- the context of a speech delivered by an executive of the tacking a recently passed TV service dealer license National Retail Merchants Association. The speaker law in Kansas City, Mo. The plaintiffs, members of noted that small business was the core of the American the Electronic Association of Mo., brought action on free enterprise system and pointed out that estate taxes the argument that there is no reasonable basis for are a menace to the maintenance and succession of store singling out those in the business of sere ctng TV, ownership within a family. The following assets of in- radios and other electronic devices for a special ordi- dependent stores were listed: local ownership and Man- nance. The suit asks that the defendants be pro- agement. with resultant local prestige; flexibility and hibited from enforcing the law until final determina- freedom front head -office pressures permitting quick tion of their case. Many other technicians are sup- response to local circumstances, administration with a porting licensing. thorough knowledge of local demands.

1 RANDOM NOISE

THE ADVERTISING CIRCLE IS I ALMOST COMPLETE, WITH 42 RCA CUY CQ; CLOSED-CIRCUIT TV SETSz BRAND BRITAINS DOVE MA- ALLIANCE MFG. S RINE LAB REPORTS PREDICTS 1960 INSTALLED IN A NEW I1" SALES OF I MILLION THE POSSIBILITY YORK CITY SUPER- TV ANTENNA El y OF DECREASED MARKET.I00 ADS IN ROTATORS BASED FISH CATCHES INCREASED CAT- ON 50 DIFFERENT BEING DUETO COLORTV AND EGORIES WILL BE FISHES ABIL- FRINGE AREA SHOWN ON EACH SET BYW SALES L ITYTO IDENTIFY :7--1 FOR 7 SECONDS EACH r ULTRASONIC SIGNALS -Taff H/GG/NS .,Q SEARCH FROM FISHING SCHOONERS

ELECTRONIC TECHNICIAN November, 1959 35 Audio Troubleshooting With A Scope

Amplifier Distortions Revealed Through Waveform Analysis

ROBERT G. MIDDLETON to avoid ground loops and other cated by sharp clipping of the output spurious effects. Oscillator impedance waveform. This fault can be localized is usually of a low order and can be to a single stage in the amplifier by plugged into a tuner jack, available injecting the audio -oscillator signal Hi -fi -conscious trends to- on most amplifier control units. It is into successive grids through a 0.25 of day forecast the devel- important to match the amplifier's isolating capacitor. However, when an opment of more compre- output impedance with a resistor load excessive input signal is applied, any hensive audio equipment having the proper ohmage and watt- amplifier can be driven into overload. for the home. The increas- age in order to replace the speaker. Clipping seen on overload should be ing demand for higher When multiple output taps are avail- symmetrical, occurring simultaneously quality sound reproduction able, it is desirable, though not im- on both positive and negative peaks. perative, to use necessitates constant re- the highest imped- Limiting is a form of amplitude dis- ance tap. tortion appraisal, not only of test which is less severe than clipping. A equipment capabilities, but typical case of limiting is Amplitude Distortion illustrated in Fig. 3. Like also a new look at test clipping, limiting is the result of non-linear know-how. A basic test set-up for amplitude operation of a stage. Limiting and distortion observations, with audio clipping both generate spurious even l i, l l ll l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l l 111110111111011111l l l l, ll 111111111111111011111111.. oscillator and scope, is shown in Fig. harmonics in the output waveform. 1. An overall check of the amplifier In case the audio oscillator does not Waveform analysis is the easiest can be made at the start, and then have a pure sine -wave output, the and quickest way to check audio dis- followed up with a stage -by -stage generator waveform must be tortion in an amplifier. Equipment recom- check, if necessary. An essential part pared with the amplifier output wave- quirements are a sine wave audio of this procedure is proper interpreta- form. If the two have the identical oscillator providing a clean signal and tion of the waveforms. shape, the amplifier is not distorting, a scope. Any evident inadequacies in An obvious case of amplitude dis- regardless of how non -sinusoidal the test equipment should, of course, be tortion is shown in Fig. 2B, as inch - waveform is. taken into consideration when viewing the output waveform. Fig. Z IAl-Normal scope sine wave display. 1B1-Sine wave is distorted by severe clip- Test Methods As usual, hook-ups should he as ping with even -order harmonics indicated. short as possible, using shielded leads A more accurate test of amplitude distortion can be made by using the test set-up shown in Fig. 4. The input waveform to the audio amplifier is Fig. 1-Simple lest set-up with sine -wave generator for over-all check of amplifier. applied to the horizontal -input ter -

Fig. 3-Scope display shows sine wave dis- NORMAL DISPLAY tortion ncaused by audio amplifier f limiting.

DISTORTED DISPLAY

36 ELECTRONIC TECHNICIAN November, 1959 minals of the scope, and the output waveform from the audio amplifier is applied to the vertical -input terminals CHART 1 of the scope. As in the former test method, the When a sine wave signal is applied correct value of load resistor is re- simultaneously to an audio amplifier quired. A scope with above average and the horizontal terminals of a scope, performance characteristics is desir- and the amplifier output is applied to able. The scope's horizontal amplifier the scope's vertical terminals, a Lissa- jous is obtained, providing should have a frequency response pattern useful data regarding amplifier per- better than the audio amplifier under formance. The straight line pattern in- test. Not all scopes can meet this dicates proper amplifier operation, free requirement. of overload and phase shift. The oblique To check the frequency response of line may slope either to the right or left, depending on the number the horizontal (or vertical) amplifier of stages in the vertical and horizontal in a scope, apply the output from the amplifiers of the scope. audio oscillator directly to both the horizontal and vertical -input termi-

nals of the scope, as shown in Fig. 5. A pattern of this type indicates that A perfectly straight diagonal line must the amplifier has even -order harmonic or other forms of amplitude distortion , be obtained on the scope screen. at because of overload. It can sometimes any frequency within the range of the be determined from the pattern if the audio amplifier to he tested. See Fig. 6. amplifier is being driven into grid or When the set-up of Fig. 4 is used. plate -current cut-off. If driven into the test patterns typically obtained plate current cut-off, the bend in the oblique line usually makes a much r «n".\\ and their interpretations. are basically sharper angle. If driven into grid cur- similar to those in Chart 1. Note that rent cut-off the bend is usually more the test indicates phase shift between gradual. The scope signal attenuators i the audio amplifier's input and output. should be properly set in this test to prevent internal scope distortion which Phase as well as amplitude distortion. would be misleading to the viewer. shift is an important consideration when arranging a feedback network for the audio amplifier. This pattern indicates that the input , signal is overdriving the amplifier into Phase Shift both plate and grid -current cut -off --or, that successive stages are being over-

driven in one or the other direction. 1 The amount of phase shift is easily Odd harmonics are indicated when the measured. Large steps in phase shift bending is the same at both ends of are shown in Chart 1. With a ruled the oblique line. Both odd and even graph screen over the scope CRT, harmonics are present when the bends at each end of the line are different. ' the amount of phase shift indicated by an ellipse is found as shown in Fig. 7. has low distor- Often, an amplifier This display indicates some phase shift. t tion over the mid -band range of audio Make certain, though, that it isn't being frequencies. but develops appreciable caused by distortion in the scope am- distortion at low and at high frequen- plifiers. Although phase shift is not usually detrimental in an audio am- cies. The most common type of low - r plifier unless a negative feed -back frequency distortion is leading phase loop is utilized. In this case phase shift shift. In most cases this is caused by may produce some positive as well as too small a time -constant in one or negative feed -back, causing distortion of the amplified signal. A (Continued on following page)

The presence of even -harmonic distortion and phase shift is indicated here. Fig. 4-Audio amplifier test set-up using a The harmonic distortion is usually a to substitute for the speaker. load resistor result of overload in one or more stages. and the phase shift is caused by reactive elements in the signal path. At low frequencies, coupling, decoupling and by-pass capacitors whose values are too small usually cause the . C% phase shift. At high frequencies it is generally a result of stray shunt - capacitances across high-salue load resistors. (Chart continued on following page)

ELECTRONIC TECHNICIAN November, 1959 37 more grid -coupling circuits. Larger CHART 1 (continued) grid coupling capacitors should be used to eliminate the phase shift. The phase shift will be accompanied by reduced output, and the ellipse will This pattern indicates the presence of not show as much vertical deflection phase shift and odd -harmonic genera- as the straight line for tion. Un -symmetrical bending of the obtained the ° ellipse indicates the generation of both mid -band frequency range. even and odd harmonics. Harmonic Where screen-bypass, plate-decou- generation usually ceases when the sig- pling, or cathode -bypass capacitors nal input to the amplifier is reduced. (Continued on page 64)

A 90° phase shift is shown, with even harmonic generation and overload distortion. .F

Fig. 5-Set-up with oscillator to check Here, the 90° phase shift is accompa- frequency response of the scope amplifiers. nied by odd -harmonic distortion. A double -clipped circle in which the clipping is unsymmetrical on top and bottom indicates a 90° phase shift with Fig. 6-When a diagonal scope trace (Al both even and odd harmonics. is obtained over the entire frequency range of the sine -wave oscillator, scope is satisfactory for use in Fig. 4 test set-up. If elliptical or circular patterns are obtained IB-C), scope is inadequate. When the circle is not round and displays irregularities, the signal source is not a pure sine wave. The desired phase shift between the signals to the vertical and horizontal amplifiers of the scope can easily be obtained by inserting a variable or suitable value capacitance in series with the lead to :. the vertical amplifier.

The manner in which phase patterns change as the phase difference increases is illustrated in these scope displays. At 0°, the relations of vertical and horizontal scope amplifiers are such that the oblique line slopes to the right. If the voltages applied to the horizontal and vertical deflection plates of the scope CRT are equal, this line will slope at an angle of 45°. As the IN PHASE 45° PHASE DIFFERENCE phase difference between the two volt- Qcages increases from 0° to 45°, the oblique line opens into an ellipse, as shown in the second pattern. From 45° to 90°, the ellipse continues to increase along its minor axis until at 90° the 90° PHASE 135° PHASE axes are equal, a DIFFERENCE DIFFERENCE and circle is formed. From 90° to 180°, the circle flattens progressively into elliptical patterns, collapsing completely to a straight line at 180°; but now slanting to the left. As still larger phase differences are 160° PHASE applied, the series of patterns is re - DIFFERENCE peated; thus, at 225°, the same pattern is obtained as at 135° and at 270° a circle is again obtained.

38 ELECTRONIC TECHNICIAN November, 1959 JF

Corner

Difficult Service Jobs Described by Readers

Over -Heating Flyback my hand on contact. The brass screw many apartment buildings, but my IA as used as a tie point to the 6CD6 better judgment told me not to. This RCA KCS68C had no high plate and removing this connection The perplexing fact about the voltage when brought to the shop. did not affect heating. See Fig. 1. The whole situation was knowing that Tubes had been substituted in the transformer was dismantled and in- the set performed fine in the shop. home and failed to correct the trouble. spection disclosed all the elements I wandered if something had been After checking voltages at the hori- necessary for small-scale induction jarred or moved during transport to zontal oscillator and determining that heating-the high frequency current - bring on the trouble so I pulled the proper waveforms of correct ampli- carrying work -coil and metal washers chassis out of the cabinet and in- tude were arriving at the grid of the representing the work -piece in the spected it, paying close attention to 6CD6 horizontal output tube, the fly - magnetic field. I remembered about the sync output and integrator cir- hack was checked with a fly -back thet mal conduction from the work - cuits. Everything appeared to be in tester and it proved defective. piece in induction heating gradually order. A new direct replacement trans- heating other parts and reassembled At this point the customer, who former was installed and high voltage the transformer with fiber washers in the meantime was busying herself was restored. However, the raster substituting for the iron washers and in the kitchen, walked in and asked barely filled the screen and in a short spacers. how things were coming along time the insulating material on the The set now performed correctly (probably wondering what was tak- flyback became soft, indicating over - with width to spare. The transformer ing so long). I sadly confessed that showed no signs of overheating after the situation could be better and many hours of continuous use.- then asked if the set had ever acted Howard E. Chace, Southbridge, Mass. this way before. Indeed it had-in fact, she said, ever since the set had been previously repaired. Now I tried to put the pieces to- Unstable Sync gether. The picture rolled before I A Silverlone model 6170 was taken took the set away: didn't while in to the shop for no raster. The re- the shop and now was rolling again. BRASS BOLT pair was more or less routine. An I remembered something. A piece of (TIE POINT TO metal strip in the bottom of the 6C06 PLATE; open electrolytic condenser in. the boost supply was causing a drop in cabinet. In a flash it came to me- high voltage and the consequent the picture tube and its harness loss of raster, so I replaced it. were not grounded and that was Fig. 1-Loss of normal roster width and probably the trouble. The grounding of transformer resulted I air tested the set, adjusted the severe overheating had been broken off on the from use of metal washers in this flyback. tuner slugs and made my delivery. strap Once the chassis was bolted into previous repair and had fallen to the bottom of the cabinet. I took it heating. I next changed the horizontal place, however. I found much to my back into place, and output and damper tubes, checked surprise that the set did not perform out, soldered it was on again and adjusted grid drive, width and well at all. Out of the seven operat- when the set switched all snapped into the horizontal linearity coil. All volt- ing channels only two programs the pictures right place with perfect vertical stability. age checks in the horizontal output would hold still. The others had very A. Long Island and damper section indicated no poor vertical stability with practi- -Frank Salerno, N.Y. cause for doubt in this area. cally no lock whatsoever. City, A closer inspection of the fly -back My first thought was that a tube might have gone sour so I checked transformer revealed that the coil TOUGH DOGS WANTED! form at one end was overheating and them. With that possibility out of the the rest of the way I looked at the indoor antenna S10 for acceptable items. Use drawings to illustrate gradually heating whenever necessary. A rough sketch will do. Photos transformer. Tests showed that in one and tried a new one but the poor are desirable. Unacceptable items will be returned. us. I Send your entries to "Tough Dogs" Editor, ELEC. minute of operation the head of the vertical sync was still with DOH IC TECHNICIAN, 460 Lexington Ave., New brass screw and washer would heat wanted to blame the reception area, York 17, N. Y. up to the point where it would burn as the location was in the midst of Conquer Obscure Video Defects Square -Wave Tests Identify "Ringing" & "Transient" Distortions

pare this with the typical high fidelity certain degree of ringing in order to RAY MANSFIELD audio amplifier requirement of 20 cps obtain a sharp picture. The defect to 20,000 cps and you can visualize referred to occurs when the ringing

11111111111111111111111111111 llllllllll 111I11111111111111111 11111 I I I I I I I I I I I I I 11111111111111 I I I I I I R the design problems encountered in is of a disturbing nature. Very close the quest for TV picture quality. For- inspection of a transmitted picture tunately, though, our visual sense is will usually indicate a slight amount The video amplifier makes not as critical as our aural one; nor an important contribu- are the gain requirements comparable tion to picture quality. Dis- to audio amplifier needs. tortion in this TV section An occasional source of irritation often causes circuit ghosts, produced by the video amplifier is fuzzy picture edges and "ringing." Sometimes there is only picture smear. Square wave one visible repeat in the picture out- tests can give valuable in- line; in other cases many repeats of formation regarding its op- diminishing intensity are seen. The eration, including: symptom, repeated picture outlines, as shown in Fig. 1, may be misin- Frequency response terpreted as antenna ghosts. However, Phase characteristics picture ringing, also known as circuit Ringing ghosts, should never be confused with multi -path ghosts received from Overshoot the antenna. Fig. 2-Simple square -wave generator and scope set-up for identifying TV ringing.

.l l l l l l l l l l l l l 11111111/111 l l l l l I I I I111111111111111111111 l l l l l l l 111111111 lllllllll 11111111 I I I I I I I I I I I I G Identifying Ghosts

Ghosts are generally developed of ringing which is not disturbing A single section of a TV receiver, from one of three sources: Antenna, under normal viewing conditions. the video amplifier, is often responsi- A video amp's ringing is usually a video i -f, and the video amplifier. The ble for the essential quality of a result of excessive gain at the two latter sections, video i -f and amp, high picture. Its function is video frequencies. This is somewhat may produce picture ringing. It is frequently analogous to that of an audio ampli- easy to distinguish ringing from an- due to defective peaking coils or fier; amplifying a signal to a sufficient tenna ghosts. Simply view the picture damping resistors. An excellent in to magnitude order to drive the end on each channel. If similarly spaced method test and analyze for cir- product, in this case, a cuit ghosts is by means CRT. However, repeated images are displayed on all of square the TV designer has waves. This results from set to contend channels, then the trouble is ringing. the fact with an amplifier that should have a Antenna ghosts will differ from that a video signal has sudden tran- good response in the frequency range channel -to -channel. sitions, just as a square wave has of about 30 cps 4 mc. Now, abrupt leading and trailing to com- Once this has been determined, the edges. The simplest circuit ghost -producing section must type of square -wave Fig. 1-Diminishing repeated picture out- be isolated. Is it i lines caused by video amplifier ringing. the video -f or the vídeo amplifier? It is the video i -f if rotating the fine tuner, Fig. 3-Horizontal sync pulse and color thereby al- burst distorted by ringing in amplifier. tering the response curve of the usually -staggered i-f's, will result in the circuit ghosts being displaced from , w --` .C.rura+ 1~.111P-1 its previous position. If the multiple images remain in the same position, rather than moving around when the .... ., . fine tuner is rotated, the defect is in the video amplifier section. One word of caution concerning Y ringing; all TV receivers exhibit a

40 ELECTRONIC TECHNICIAN November, 1959 e

- _ ._ . ní..e. s

Fig. 5-Ringing bar envelopes of 3.58 me chroma signal from high peaked amplifier. Fig. 6-"Soft" indefinite outlines of two Fig. 7-Cause of "soft" edges is revealed don( areas indicates corner rounding fault. by rounded edges of square waves on scope. test is made by applying the output transient oscillation is not highly find overshoot accompanied by some from a square -wave generator to the damped. The ringing which starts at ringing. On the other hand ringing input of a video amplifier and con- one level change carries over to the (circuit ghosts) can occur without necting a scope to the output of the next level change. In certain instances, overshoot. It all depends on the char- video amplifier. See Fig. 2. Useful we see that the "hangover" is opposed acteristics of the circuit configuration. tests can be made at high frequencies, by the ensuing transient oscillation, in It results from lack of flat frequency such as 100 kc. 60 cps may be used for others, aided. This depends in each response in the video amplifier. The any low frequency tests. instance on the exact duration of the frequency response can be made uni- gray level. form by attention to peaking -coil in- Ringing Distortion The same highly peaked amplifier ductances and damping. rings a 3.58-mc chroina signal as seen The peaking coils are damped to Fig. 3 shows how a ringing amplifier in Fig. 5. The bar envelopes ring just some extent by the internal resistance can distort a horizontal sync pulse and as a square -wave signal rings. This of the circuit, but in addition, a damp- color burst. This is a case of damped points up the general utility of a ing resistor of approximately 10-k to ringing. The transient oscillation is square -wave test in checking the 30-k ohms is required across the large at the initiating pulse edge, and transient response of an amplifier. series peaking coil L1. shown in Fig. 8. then decreases in amplitude. We may note some interesting and High Frequency Tests Low Frequency Tests perhaps unexpected responses in amplifiers which ring strongly. For ex- A good video amplifier will repro- Using a 60 -cycle square wave, if ample, Fig. 4 shows a Y signal as duce a 100-kc wave without excessive the reproduced waveform has con- reproduced by a good video amplifier, overshoot, ringing, or corner rounding. siderable tilt, as seen in Fig. 10, pic- and by an amplifier which rings badly. These faults give rise respectively to ture shading will vary from top to The odd feature in the distorted black or white outlines in the edges bottom of the screen giving an im- waveform is that some of the gray of pictures and "soft" indefinite pic- pression of a smeared picture. The levels ring strongly while others ring ture edges, in addition to circuit tilt must be corrected by attention weakly. ghosts. to the time constants in the video - The difference in ringing amplitudes The beam current in the picture amplifier circuit shown in Fig. 8. is caused by ringing "hangover" from tube never transits from white to Tilt distortion can occur in the grid - one gray level to the next. The black, or vice -versa, in zero time. In- coupling circuit Cif?, unless the stead, edge distortion of some type product of R and C is sufficiently high. Fig. 4-IA) Y signal is being reproduced will always he present. Illustrated in Likewise the output coupling circuit properly by a normal functioning amplifier. C_R., must have an adequate time in video Fig. 6 is an example of corner round- 18)-Same signal rings strongly as R3C3 and R4C4. Tilt amp having o sharp high -frequency peak. ing. The edges of the dark areas are constant, must "soft", instead of sharp and abrupt. (Continued on page 94) The cause for "soft" edges is im- in mediately apparent a high -fre- Fig. 8-Tc improve corners on reproduced quency square -wave test. As shown square wove, give attention to values of in Fig. 7, the corners of the square plate -load resistance and peaking coils. wave are rounded off instead of well defined. To improve the corners of a reproduced square wave, give attention to the values of plate -load resistance and peaking coils in the video amplifier circuit, illustrated in Fig. 8.

Overshoot Distortion

A typical example of overshoot, as WAVEFORM EXPANDED seen in Fig. 9, causes picture edges to ' TO SHOW RINGING DETAIL be outlined in black or white. We often

ELECTRONIC TECHNICIAN November, 1959 41 Choosing A Mobile Radio System

A Selective View Of 2 -Way Radio Sales & Installations

ALLAN LYTEL

General Electric nunununnunnrnuunnnnuuunnnunnnunuunnunuuunrnnuuuuunu . selection of a system is naturally predicated on its intended use, available Depending upon particu- space and cost, and the expert f should be aware of the lar use choices open or need, a wide to him. variety of two-way mobile radio installations are possible. Equipment must there- Typical System fore be selected to meet specific needs. Consulta- A typical mobile radio system be- tions and close cooperation gins, for example, with a fleet of with the prospective user is trucks used for pickup and delivery most desirable in order to in a metropolitan area. One fixed achieve satisfactory results. base station and several mobile stations Gonset Intelligent advice and final are used for a two-way radio network. More mobile stations selection of equipment re- can be added at any time and, as the traffic quire the technician to have area expands, the system can be a en- thorough knowledge of larged to give wider communication basic mobile systems. coverage by using repeater stations at several strategic points. The usual system 11111111111111111:111111111111111111111111111111I11111IIIIII1II1II1IIII,1I1111111IIIIIIIIIIIII11111 employs one frequency although some installations A frequently neglected, though have a need for several channels. A profitable, field open to the electronic typical case would be a large in- technician with the proper FCC li- stallation where vehicles are speaking cense is mobile radio sales and serv- to each other and the base station ice. In order to issue the professional wishes to call a third mobile unit on Vocaline advice expected of him, the technician another stand-by frequency. .s...,. should have a well-rounded knowl- Various types of control are possi- edge of basic mobile systems. The ,.\ (Text continued on page 44) Fig. 1-Typical mobile base station, A, with remote control facilities at B. Two-way con- versations from either point may be carried on with C, D, or other vehicles in the field. í t

Bendix

. S. A'

42 ELECTRONIC TECHNICIAN November, 1959 Cort'co TABLE 1

Service

AVIATION All commercial and private aircraft and L ground stations AMATEUR Non-commercial hobbyists ane experimenters Part 12 CITIZENS All citizens not otherwise eligible for other Part 19 licenses EXPERIMENTAL Commercial research and development Part 5 INDUSTRIAL Business enterprises Part 11 Power Electric, gas, steam and water public utilities Petroleum Petroleum product prospectors, producers, refiners and pipeline operators companies Forest Timber and logging s Relay Press News services and newspapers '! tAtz! Motion Plc. Motion picture studios Business Any business enterprise Special Any manufacturing, construction or production activity in a rural area tincluding form- ing/ or in an urban area within limitations LAND Common and contract carriers of passengers Part 16 Motorola TRANSPORTATION and freight Railroad Railroad operating companies r- - Taxicabs Taxicab operators Motor Carrier Common or contract carrier transportation Auto Emerg, Public garages and auto clubs r MARINE All commercial and private land stations for Part 7 maritime communications All marine utility (portable) stations on land Part 7 or shipboard All commercial and private radio equipped Part 8 vessels PUBLIC SAFETY Agencies protecting life and property Part 10 Police Municipal, county and state police ° Fire Municipal and volunteer fire dept.'s Forestry - Governmental and private forest protection Conservation Highway Maint. Governmental operation, supervision and maintenance of public roads Special Disaster relief organizations Emergency Physicians and veterinarians In rural areas Ambulance and rescue squads Communications common carrier standby Isolated area communications Communications common carrier emergency RCA

TABLE 2 Other Frequency Bands Related to Commercial Mobile Radio

Bond Service Notes (nu ) > r , r) 1.6-5.0 Restricted to special corm- long-range of 25-50 miles , mercial use or more 72.0-76.0 Point-to-point Use Use must not cause television interference 118.0-132.0 Airport Service Ground -to -ground at air- ports (AM not FM) 132.0-144.0 Reserved for Governrrent 162.0-174.0 Use 462.55-463.20 Citizen's Bond (A) Maximum power 60 watts, 464.74-464.95 FM and AM stations 50 kc 465.05-466.45 apart, for two-way radio (460.05-460.95 telephone also presently used) i 462.525-467.475 Citizen's Bond (81 Maximum power 5 watts, AM or FM for remote control, stations 10 kc apart Du Mont 26.995, 27.045, Citizen's Band (C) Maximum power 5 watts 27.095, 27.145, 27.195 (except on 27.255 where it and 27.255 Is 30 watts), On-oR carrier or AM tone only, NOT for radio -telephone, for mobile radio control only 26.965-27.035 Citizen's Band (D) Maximum power 5 watts, 27.005-27.085 AM two-way radio-tele - 27.105 -27.135 phone, stations 10 kc apart 27.155-27.185 27.205-27.225 growth throughout the years; au- thorizations have doubled in the past five years. Safety and special service facilities may be seen in Table 1. Other frequency bands are listed in Table 2.

Frequency Shortage

Its rapid growth has created the need for more frequency allocations. A number of solutions have been offered for utilizing available space more effectively. Cooperative efforts Fig. 2 (Al-Trunk installation of two-way mobile system with location of antenna providing on the of short lead to equipment. (B1-Two-way radio mounted under dash board of mobile vehicle. part users, manufacturers and the FCC, have relieved the situation from time to time by channel (Continued front page 42) also available for two -channel re- splitting, sharing of channels and ble. Local control is usually used ception, using two different local os- highly significant design improve- when the operator is immediately ad- cillators. The receivers are adjusted ments in both FM and SSB trans- jacent to the transmitting and receiv- to a specified frequency at the factory mitters and receivers. ing equipment. In extended local and local oscillators are typically crys- Tighter frequency deviations have control the distance between the op- tal controlled. Single, double and triple been prescribed by the FCC. A ± 5 and erator the equipment is about conversion superhetrodynes are used, kc deviation has been adopted as 50 feet or less and speech pream- and some systems include afc. Selec- standard for land mobile service trans- plificat íon is not required. Whenever tivity between 20 and 40 kc, or better, mitters in the 25-50 mc and 152-162 it is to desirable locate the trans- with one microvolt or less sensitivity mc hands. A 15 kc tolerance was mitter a considerable distance from is common. Radio receivers for mobile established for the 450-460 mc bands. the operating position, on a hill -top use are designed with squelch cir- See Table 3. Numerous other methods for example, remote control is used. cuits-to prevent disturbing high noise are being explored to obtain greater Accordingly, a speech amplifier is level output from the speaker when no available air -space. These include: necessary to provide normal audio signal is being recei ed. Prevention of harmonic radiation, use signals over the wire -line to the trans- of directional antennas to confine mitter. Scope radiated energy in specific areas, re- In a typical dual -point control ar- duced power for some transmitters rangement, as shown in Fig. 1, the While mobile radio began as a tool to required minimum, carrier off -set base station is located at A, near the for emergency communications it has operation, greater frequency sharing, fixed antenna. Two-way conversation expanded because of its recognized and different improved modulation may be carried on from one or more cost and time -saving features. Ac- systems. local control positions from point A, cording to the FCC, safety and spe- or from one or more remote control cial radio services comprise the Installation positions from point B. Dispatching largest number of authorized stations. or two-way conversation with any embracing all radio transmitters ex- Installation of a mobile radio in vehicle may be carried on from either cepting broadcast, common carrier vehicles differs with the type of point. Floor control switches can and experimental. equipment and the type of vehicle. free both hands of the operator. Moni- The number of transmitters In use Every installation should he made toring units may be used at either have expanded annually and by the for both convenient operation and point to permit to hear personnel both end of June, 1958, about 1,400,000 consideration of maintenance ease. incoming and outgoing messages. Ve- transmitters were on record. This A definite layout plan for the radio, hicle D, with equipped two-way statistic is not only a result of a slow (Continued on page 62) radio, may also speak to any other vehicle in the system.

Design TABLE 3 Mobile radio equipment varies The Important Mobile Radio Frequency Bands for Commercial Use widely in design and construction. Base stations are usually operated Frequency Band Range** Channel Spacing Tolerance Deviation from a -c power lines with power in- Om) (miles) Old New (percent) (kc) puts from 30 to 250 watts. A mobile station is operated from the vehicle 25-53 25-60 40 20 0.002 5 battery -6 or 12 v. d -c. The mobile 152-162 10-30 60 15* 0.0005 5 transmitter normally has an input 450-460 10-25 100 SO 0.0005 15 power of 25 to 100 watts, although it Alternate channels are used; the spacing is thus 30 kc. can be higher. Receivers are **Range is comparative only. It depends upon transmission conditions and generally power output. single frequency tuned but they are

44 ELECTRONIC TECHNICIAN November, 1959 AEAAItfAt y01ALS 'nil POINT cOAAEAEIOA EOUIPErt

au« [Lint TAPE TWE tECOAJIC AECOAOEt ;e-rj : ,. . ... ,

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THE NATION H. BORE H.: OF Sr \ NDAROS e Computer Analyzes

Electronics is playing an invaluable part in combating one of man's Heartbeat great killers. heart disease, through Human diagnostic and therapeutic equipment. In line with the medical role played Electronics Helps Diagnose Heart Diseases by electronics in the past. the Na- tional Bureau of Standards has de - 'eloped a computer to compare and analyze heartbeat information. The deelopment work was sponsored by the Veterans Administration. I Using magnetic tape to record heartbeat data and a high-speed digital computer to compare these records. a physician can make an objective diagnosis of a patient. Although much work has been done on the relation- ship between heart disease and electrocardiograms. diagnostic methods ÍI° are largely based on practical experience, rather than an accurate scien-

t tific method. To achieve a more scientific means of diagnosing heart

r A: disease it is desirable to analyze a # * greater number and variety of heart- # beat records to establish accurate :,: .. limits of normality. - Adequate statistical studies are feasible through use of magnetic tapes ar.d high-speed computers. These tapes have the advantage of being able to store enormous amounts of data that can be used quickly and efficiently for comparing past records with new ones. Operation

414 The new development has been 4 designed to perform a conversion process. heartbeat data is recorded on magnetic tape as continuous wave- Fig. 1-Aiding in a medical diagnosis of heart disease, the anclog-digital converter forms (electrocardiograms) and are in computer. P,rt of the changes heartbeat data to a form suitable for use o high-speed (Continued on page 60) computer equipment is shown with a medical technician at monitor and cDnrrot position

ELECTRONIC TECHNICIAN November, 1959 45 V502 -A V502 -B Approach To 6037 6D R7 T104 vERLOSC. 1 VERT.OUTPUT R523 R544 VERT - pC503 OUTPUT TR. r 33 15K 255V. --- 81.0 YE1_ C508110526 R536521 ,0033 003 2 1540 82001 .068 e2GOvL 15K --J 3 1 7 RED R541 C51131 0520 R539 R150 0.1 1000 i 8 ,1.5MEG. 022 330 Printed 9 t_o- - C517 R534 PC 501-C 0.1 10.8V. 22K -rC519 r B R525 y004, R537 f- I 6.8 MEG - R532 pC5018 '- 56 K _ R542 T 470K I D s6.8 NEG. T9- - 71_1 ' 1 ' 1 1 R531 35991' 1 9 KJ ! 1 a RSig ~ L _ _ 2. MR'. 300 4. MEG. vERT Liu. Circuit HEIGHT +261V. +261 V.

Fig. 1-Schematic of on RCA KCS-128A vertical multivibrator and Servicing sweep output circuit.

Industry Service Aids Simplify Repairs

to remove a chassis from a cabinet aware of the technician's service BERNARD GREEN and set up the set with yoke and needs and many have now included CRT than to make the actual repair. circuit tracing aids in the form of Printed circuits, with components color -coded The introduction of printed cir- printing right on the facing the service technician, there- circuit hoard cuitry was a severe jolt to the service itself. Component stock fore present an opportunity to effect numbers, technician's modus operandi. The identification of B+, age, repairs in a minimum of time. test need for revised repair techniques points and other voltage lines, Manufacturers have become more are helping and new tools created a furor in the the technician im- trade. However, technicians are now Fig. 2-A pictorial circuit view of the 1 fully aware of the major part schematic in Fig. illustrates easy component played identification. The board has been reversed to coincide with the diagram view of Fig. 3. by printed circuits, since they form an integral part of a technician's workday life. Continued familiariza- tion with printed circuit repair techniques should minimize or eliminate --'1h..16,f4.ry many earlier difficulties. h.

"NI Servicing Approach V R . beei' Approaching a repair job with the :ara it proper tools and the knowledge to use them is a tremendous asset in 1 any type of service work. This is certainly true of printed circuiting serv- o .., icing. S rmt Many technicians, in their initial '! c { T Il zeal to deprecate printed circuits, j 'Pi.. , r T1 ILI P overlooked at least one important T " t Rs, t' ,':' fos advantage frequently offered by it ,° :f1. 1 B .;1.t. that cannot be n e matched by their ,4-- _L. hand -wired brothers-the possibility of repairing a "shop job" set without - l"t removing it from its As cabinet. you , _z - well know, it 't ---, often takes more time .'wy ,. ,. " 46 ELECTRONIC TECHNICIAN November, 1959 : 44llll111111111111I1111i111111111111111111111111111111111111111111111111111111111111111I11111I111111 I E A a C D ,r!- RS Printed circuitry has tw-4( Y G o ° < °°op° Q+ ° LSO lEH[L,. ° come a long way since No - z -s3=0r I I I` its Proximity Fuse days. 1 t . t3 . R.I, c - I 1 ` _9 one knows this better than I y lt 50! ° ..,I - as the service technician, who 5Z0 e is with this new { I S + 17 - confronted 4.111:2t, 830 -15"- `Rstt <}-a » 6°R . technique on a ' . , °1C Out production l - ! ' \ . -1 .t daily basis. Manufacturers e,'°cs°.55`) 4e/,`' ° 2 2 CS21 5Z511 C 1 ' using printed circuitry in 4N C' c516 PO S03 . 1: ao -.I 1` their radio -TV sets have Pcsor °' `` A _.

L''1! { c542 ! provided the technician II R52D `1 +ol jF 5 vso OR 1 ,1: ° with numerous service aids 3 , e ' a» s 1,24 ° C facilitate quick, efficient 1 n Cti \R Z to 1R1. IG ¡yi \ csw .

this latest contribu- / wll I to meet yCl < i l . . 1.' tion to the industrial revolu- L 5.1 l 0 CS17 I ! ;l I 1- R501 -=J L. V ` tion with assurance. o X\y J r I D 1 E A I 9 i C IIIIIIIIIIIIIIIllll1111111111111111I11111111111111111111111111111I11I11111111Illllllmen 111111111 PCSrJ 07 8543. C. R515 Al R53. RI C50 C508 C: cS:S . 8. CPRS02 !3 p I R212 03 8519 42 853/ E. COD . AI C5ID A. CSI. 1,2 In addition, service data .. 13539 DL measurably. . 44 RSc: 04 8514 83 8520 C3 CS03 Al CSII . 47 C51R Cl .501 R5C2 133 R5!2 411 8521 03 RS41 . CI to C50 C3 C512 . ..42 CMS 9I information has been expanded DI RSo: DI RSIE 62 1/375 C2 9547 82 C405 . E5 C513 . A: C52.3 CI P503 8576 A3 .84 . 21 i:S07 . C3 8504 C4 RS'1 43 encompass a practical view of printed CS46 . Q/ CSI. WI board circuit tracing to further sim- is a aid in pin -pointing location of component. plify the technician's work. Fig. 3 --Diagrammatic location guide service Many of the old gripes no longer exist. Printed circuit hoard strength has been increased, for example. Production quality has been improved. This doesn't mean that electronic's panacea has been found, but it does indicate that efficient service Fig. 4-Facilitating circuit traccg and parts Iccation, GE ind cafes tube types, test n circuit board. of products incorporating printed points, grounds, et:- in non-conductive yellow point directly on printed circuitry is not only feasible, but practical too. C210 Troubleshooting R209 R213 13 C209 *r Let's look at a modern TV set using printed circuits; an RCA chassis KCS 128A. Assuming a complaint of "no vertical deflection," the vertical oscillator and output dual tube, 6DR7, would be replaced after removing the back cover. If vertical -R25'e reflection was still absent, the R I 251Á may he looked at, as schematic C252, 2518 +t15 shown in Fig. 1. The receiver obvi- Val Ft2 5 C251. ously uses a feedback circuit from 144...D 6CGi the output stage to form an oscillator 4" = x I is a R2012 , ' feedback loop. The oscillator \ ti multivibrator type. RC20i `1i Visually inspecting the vertical R401 5Y section of the printed circuit hoard, shown in Fig. 2, for signs of burnt components, broken leads, etc., Bi3 I?262 everything appears normal. Looking at the schematic, we notice that the components are clearly referenced to the actual printed board, with identi- 1-1+13808 (Conttinued on page 80)

ELECTRONIC TECHNICIAN November, 1959 47 What's Your Service Score?

Periodic Customer Relation Reviews Increase Business Effectiveness

ERNEST W. FAIR nician to clean the normally unex- dence and leaves a professional busi- posed areas when the TV set is ness impression with the customer. How good are your service pro- moved aside for repair. Don't under- Your reputation is important; always cedures? How effectively do you estimate the effect created by respect honor a guarantee issued by your handle your customers? Do your for another person's property. shop. customer relations enable you to 3. Are you courteous at all times? 6. Does your shop maintain a re- hold your old customers and secure The importance of common cour- placement set in the event that a new ones by their recommendations? tesies cannot be overemphasized. No shop job is held up while either Just what is your service score? awaiting receipt of a hard -to - One of the secrets of any success- obtain replacement part or due SERVICE SCORE to ful service operation is periodic ex- CHART difficulty in locating the trouble? amination of its procedures to dis- Number YES NO TV is no longer a luxury and de- cover areas where improvements can priving a customer of a set for an be made. The this success of method 1 extended period of time will be an- is dependent on the thoroughness of noying. In addition, the 2 customer the check. usually "hounds" the technician un- Careful analysis of successful pro- 3 til the set is repaired and, not fully grams practiced in selected shops understanding a parts procurement throughout the country, resulted in problem or a service difficulty, will the questionnaire listed below. It not tend to lose confidence in the tech- only serves the reader in rating his 18 nician. In some areas, shops auto- own shop and staff, but also suggests matically loan a 19 set when one is re- additional steps to take toward ac- moved from the home. There are quiring additional business. 20 shops that maintain a TV rental sec- Completing the following question and charge a nominal fee when tions by checking either "Yes" or TOTALS substituting their set for the one re- "No" on a chart similar to Fig. 1 will moved. quickly reveal the service score of Fig. 1-The service score chart illustrated 7. Do your technicians always have any radio -TV shop. should be completed at regular intervals. A the proper service tools and equip- 1. Do you handle every service call "Yes" rating of 15 or over is excellent; 10-15 suggests o need for closer service ment? immediately, or promptly inform policy inspection; under 10-danger signal. The most skilled service techni- the customer why it cannot be cian may appear to be a "tinkerer" done? one likes a curt reply or poor man- if forced to employ make -shift A customer who has been led to ners. A service technician works at equipment. Proper equipment should believe hís service call will receive a hurried pace by necessity and can always be supplied to allow a tech- immediate attention will probably easily overlook the human relations nician to exercise his knowledge and be quite irritated when an unusual part of his job. experience in a professional man- delay occurs. Many shops require 4. Do you ever talk "down" or "up" ner. outside service technicians to "call to customers? 8. Do you ever permit anyone lack- in" if one of their service calls ab- Sometimes experts in their respec- ing proper skill and training, ex- sorbs an unusual amount of time. tive field create a poor impression cepting supervised apprentices, to This enables the shop to contact the with clients by treating them as ig- undertake TV repairs? technician's other customers and in- noramuses. No one appreciates an at- During a temporary rush period, form them that their sets will be re- titude that is too patronizing. Re- shops may be tempted to secure in- paired at a later time. You'd be sur- sentment is also caused by high adequately trained help if skilled prised how this courtesy builds good technical level talks beyond the cus- technicians are not available. It will. tomer's comprehension. Although never pays to hire such individuals. 2. How is your "good housekeeping" well meant, it is misunderstood as It only results in poor workmanship, on home service calls? an attempt to confuse the real issues. "pulled" sets that should have been Many service technicians spread 5. Is it a standard practice to leave repaired in the home, or worse, the service cloths around sets before a written guarantee or warranty untrained representative of your making repairs. Some companies of labor and parts and live up to it shop telling the customer that their even maintain small hand vacuums scrupulously? set must go to the shop and, the in their trucks to enable their tech- A written guarantee builds confi- (Continued on page 91)

48 ELECTRONIC TECHNICIAN November, 1959 Radio and TV technicians have learned long ago that TV or FM receivers are no better than their antenna equipment. This fact is equally true of TV and FM master antenna MASTER systems for motels, apartment houses, schools, commercial buildings, etc. Basically, the master system consists of: (1) antenna, (2) head -end equipment and (3) distribution equipment. Local conditions and individual TELEVISION requirements determine the types of antennas, masts, etc., to be used and the method of installation. Systems ANTENNAS When all signals originate from one direction, with approximately equal strength, a broad -band all channel "Yagi" or similar type antenna may a mismatch ratio of 3:1 at this point fier in the center of the building, one prove effective. Where both high and is unimportant in strong signal areas, output for each of the 4 risers is low VHF channels are to be received it may pose a problem under extreme required. As shown, the four open fringe conditions. A mismatch of any riser ends must be properly termi- proportion at the input of the head -in nated. equipment, however, can create System installations require a pre- standing waves on the feed line, re- liminary survey using a field -strength HI BAND LO BAND sulting in ghost distortion. meter to determine mast location, Where low and high -band antennas height and particular antenna type. are used, signals are fed through Matching transformer, amplifier, co- it it a band combining filter, to the input axial cable, line splitter and set out- MATCHING MTRANSFATCHING I of the amplifier, as shown in Fig. 1; let requirements must also be deter- TRANSF. then to a distribution system line mined. A VOM is required to check MIXING splitter. FILTER When Yagi antennas are used, the signals f-om each are fed through a filter and into a mixing network- FROM AME LIFIER AMPLIFIER sometimes called the filter base. Sig- 10 OUTLETS 10 OUTLETS nals injected into the filter base must be of equal strength. Where signal UNE SPLI1TER TO DISTRIBUTION levels vary, attenuators at the filter input are required on stronger signals.

The output of the filter base is fed 10 OUTLETS Fig. 1-Signals from high and low band VHF to antennas ore fed through matching network, through the distribution amplifier combining filter, and then to amplifier. the line splitter. In high signal -strength areas, from different directions, separate where direct pickup occurs on the Fig. 2-Typical 40 set distribution system or applications. tr low -band and high -band antennas short piece of 300 ohm wire from the for use in motel similar are necessary. Certain specific local antenna terminals of a set to the tuner, conditions may dictate separate Yagi coaxial connections must be made directly to the tuner-being careful antennas for each channel to be re- for and opens in cables. Service s not to expose any of the center wire shorts ceived. In some areas, stacking of Yagi poses no different problems than of the cable. Multipath signals, causing antennas may be necessary to increase TV or FM instal- ghost distortion. can be picked up at those of single set gain and reduce interference. Remote lations. Amplifiers may require an may also be needed. this point. preamplifiers occasional tube or component replace- Impedance Matching Typical Installation ment. IL is possible to design and install Characteristic impedances of an- Illustrated in Fig. 2 is a master an infinite variety of systems to fit tennas vary widely with types, con- system designed for an existing motel most needs, capable of furnishing figurations and, in all -channel broad- with 2 floors and 20 rooms on each many TV and FM receivers with band structures, with frequency being floor. Rooms on the top floor are optimum reception at a given lo- received. An impedance mismatch serviced from an attic. On the bottom cation. between feed line and antenna will floor the exposed cable runs from -Information credit: Entron, Inc., cause a signal transfer loss. Although room to room. By locating the ampli- Bladensburg, Md.

49 ELECTRONIC TECHNICIAN November, 1959 GET BEHIND THE

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America's biggest magazines deliver this business -building offer to over pºoa Will ~ores" 100 million readers! a¡¡aº:W8áS5 8hirleytVacUaine? f ¢onrin. On .June 20th Syll ania launched the dramatic _.. combination coupon offer appearing in Amer- wore or set ica's biggest weekly magazine, TV Guide, and ..d11' 10 r \' 11, N' America's biggest monthly magazine, Reader's 111" i1U1 .,:,r.,' ^. ,11 111 c.b'..'rclakaf'Ila Digest-plus Sunday and Parade newspaper aa. supplement magazines. Your Service shares the spotlight with top- quality Sylvania picture tubes and receiv- I. ing tubes in a three-point program to make your customer's old TV set better than when it was new. 1t Month after month, more set owners will v s}ti be saving the $2.00 coupon. Many will attach it to the back of their TV set so it's there for .15Mll.n 4 r .,,,__, yn"r,...% íi' you to see. a ,^ W:..M.r.^ You can identify yourself with this program ,,.,.... s +" f r y by featuring Silver Screen 85 and Sylvania r ..¡í pr: yt receiving tubes. Get behind the biggest. most !e:,¡ p..¡- practical, business -building offer ever made vR ..1.V'..rf. .r to the Service industry. N Look for this ad in these leading national magazines.. ,K L..ay.... LMlci ºnr ^. --;, 31=-^

50 ELECTRONIC TECHNICIAN November, 1959 --1áa'- cTapeoop to 7h¡ certificate hORe eg NoNT'your TVs- is °} mil`L,GdGti or more $2.00 `, Scate i aworth against s2 in combinatl small receiving the Purchase w a tub es of ne 7o when th et owner: sceeic8 natalled card esverS ure and /rns tube. the carton cerf i fi Prna ucts wí}1 o Inc.,`n'iBoz 87 S ania small S'1 Screen B effaloryy tube(s)8 warranty This coupon You Sylvsni void if will receiveto: º Offer limited troAÍ>h $2.00 Elrnaj c to continental or restricted. by Cash rurn mail. U.S.A. anda value Nawaii_maJ 1 /loth of be withdraw 1 cent. AlIJ n »ithov. nfiee, o_on ''er Sells your service and Sylvania receiving tubes in combination with every Silver Screen 85 you install

Here's an action -packed offer that can add an F average of $3.00 to $6.00 in receiving tube business every time you install a Silver Screen 85 picture tube. Sylvania urges your customers to have their receiving tubes checked to make sure they get full performance from their new Silver Screen 85. And, to emphasize the importance of replacing weak tubes, Sylvania . offers to pay $2.00 toward the cost of Sylvania ". r _ n receiving tubes installed in combination with ` ' = a Silver Screen 85. . _ Your customers mail the $2.00 certificate - . directly to Sylvania with the picture -tube '¡¡ warranty card and receiving -tube carton end. Nothing for you to sign or send. TEe Syhania coupcn on Be prepared for taped to your rustonla's Stock up Sylvania. TV set means more receiving greater -than -ever consumer demand for and gre: ter 3 tube business America's Number One picture tube and picture tube pr3fits fe you. receiving tubes.

Y- SYLVAN 1A) S.bsld.ary of GENERAL TELEPHONE & ELECTRONICS F

ELECTRONIC TECHNICIAN November, 1959 51 Improve Your Skills By Building a Technical Library

N a 0 e ó 2 a9. i o C J a W a ñ i 3 W R o 11/11111 0 1flI='illllil 11

HOME AIR CONDITIONING BASICS OF DIGITAL INSTALLATION & REPAIR COMPUTERS (3 vols.) GUIDE TO MOBILE RADIO By J. Derman, F. H. Makstein & Seaman. By John S. Murphy. Using the easy-to - By Leo Both theory and practical construction learn picture book Sands. This fundamental, yet technique, these three practical book on 2 -way radio designs are examined, along with main- volumes explain the theory and functions covers base tenance techniques and procedure for stations, transmitters, receivers, antennas, of digital computers. Very little mathe- remote controls, power determining size of air conditioner re- matics. Covers counting systems, com- supplies, portable quired. Covers motors, gear, field survey, selective calling, li- compressors. con- puter language, programming. memories, censing and densers, evaporators, regulating valves. logic diagrams, flip-flops, clamping, input- maintenance. One section circuits and other system elements. Soft examines useful test instruments. Soft output and data processing. Soft cover, cover, 160 pages. Price cover. 160 pages. Price $3.50. 416 pages. $7.50/set. $2.85.

INDUSTRIAL CONTROL IMPEDANCE MATCHING HOW TO RUN A SMALL BUSINESS CIRCUITS By Alexander Schure. Divided into five major sections, this By Sidney Platt. Excellent starting point informative book By J. K. Lasser. Here is a basic business TV covers power transfer, impedance match- guidebook for for technician interested in learning ing devices, matching at service dealers and other about industrial electronics. Non -mathe- audio and r -f, operators of retail and small manufactur- matical text and matching in transistor circuits. Com- ing firms. Covers record explains circuitry and op- plete with tables. and keeping, avoid- eration of power controls. relays. timers. schematics compu- ing frauds, tax management, credit sales. tation examples. Soft cover, 128 pages. photoelectric devices and instrumentation Price insurance programs, how to buy an es- found in factories. Practical applications $2.90. tablished business, financing and other shown. Soft cover, 200 pages. Price 53.90. important topics. Hard cover. 400 pages. Price $4.95.

RIDER COMBINATION RADIO OPERATOR'S LICENSE SERVOMECHANISM MANUAL Q & A MANUAL FUNDAMENTALS At a cost of less than 3c' per page this new By Ben Zeines. With a minimum of Volume 25 is a servicing library in itself. By Milton Kaufman. This sixth edit:oii mathematics, this nicely illustrated text The 12" x 15" pages plus foldouts contain gives you the information you need to acquaints technicians with basic servo schematics, parts lists and a wealth of pass FCC license examinations. In ques- theory. Topics include electronic and troubleshooting data on TV sets, tran- tion and answer form similar to actual magnetic amplifiers, control systems, syn- sistor radios, home radios and hi-fi. Cov- FCC tests, all eight elements are covered, chros, performance improvements, ac and ers all major brands and including law, radiotelephone, radiotele- do servomotors and servo measurements. chassis. Pages graph, removable ffom binder. Hard cover. 978 aircraft and ship radar. Abbrevia- Servos are an important aspect of indus- pages. Price $27. tions. code. etc. included. Hard cover. trial electronics. Hard cover. 257 pages. 736 pages. Price $6.60. Price $5.50.

FUNDAMENTALS OF HOW TO INSTALL & OBTAINING & INTERPRETING RADIO TELEMETRY SERVICE AUTO RADIOS TEST SCOPE TRACES By Marvin Tepper. This well -illustrated By John F. Rider. This handbook shows basic book tells how missiles and satel- By Jack Darr. This second edition con- how to get the most out of your oscil- lites relay data tains much practical information of real loscope. 800 to earth. Topics include use to In Over traces are shown, multiplexing, receiving stations, data re- technicians. addition to service including sine, square, rectangular, trape- cording and digital techniques. Telemetry data on antennas, intermittents, noise zoid, sawtooth differentiated and inte- and suppression, speakers and troubleshoot- grated types. standards bibliography in appendix. ing. transistorized and radios Explains scope connections, Soft cover, 136 pages. Price 52.95. hybrid are manipulating controls and test covered. 6-12 volt are setups. conversions ex- Soft cover. 190 pages. Price 52.40. plained. Soft cover 160 pages. Price $3.25.

SHOOT TV & RADIO MARINE ELECTRONICS SMALL APPLIANCE SERVICING TROUBLE FAST HANDBOOK By P. T. Brockwell, Jr. This volume By Harry G. Cisin. The first part of this By Leo G. Sands. This informative text gives you professional small appliance book relates to symptoms, faults and covers the many electronic devices used servicing techniques and business pro- remedies for ac -dc radios. The second on boats, including radiophone, sound cedures. Illustrated instructions tell how part covers TV, with each systems, to test units. Covers irons, toasters. practical test direction finders, depth sounders, mixers, roasters, and repair explanation related to a steering devices, radar and power sources. coffee makers, waffle specific problem. Printed circuits are dis- Schematics are given for commercial irons. rotisseries and others. A profitable cussed. Soft cover. 40 large pages. Price units now on the market. Information on sideline for TV technicians. Hard cover. 51.50. troubleshooting is provided. Soft cover, 180 pages. Price 54.50. 232 pages plus pullouts. $3.95.

52 ELECTRONIC TECHNICIAN November, 1959 ELECTRON IC TECHNICIAN editors have carefully selected these books by the world's leading technical publishers. Order direct from our Book Department. Fill in coupon or separate sheet. Money-back guarantee.

ELECTRONIC 100 ELECTRONIC CIRCUITS SERVICING TRANSISTOR COMMUNICATIONS By Milton Aronson & Charles Kezer. RADIOS Here is a useful basic circuit reference By Robert Shrader. Starting with elec- book covering a wide variety under eight By Leonard D'Airo. After a brief dis- tronic fundamentals. this comprehensive major sections, including power supplies, cussion of fundamentals, the text goes reference text goes through transmitters, amplifiers, oscillators, pulse circuits, test into radio circuits, servicing techniques, FM, antennas, TV, shipboard radio, loran, instruments, alarms, phototubes and mis- tests, measurements and dictionary of radar and communication law. Chapters cellaneous. In addition to the schematic, transistor terms. Interchangeability chart end with two sets of questions, one to a page or two of text accompanies each covers a variety of close replacements, prepare the reader for commercial FCC circuit, explaining the operation and including number and type. Soft cover, exams, the other for amateur licenses. characteristics. Soft cover, 180 pages. 224 pages. Price 52.90. Hard cover, 937 pages. Price 513. Price $2.00.

AUDIO ENCYCLOPEDIA Books Described Previously TV CONSULTANT By Howard Tremaine. There is a library BASIC TELEVISION IS vols.) $10.00 By H. G. Cisin. Rapid TV trouble -shoot- of information in this volume, containing ing methods used here pinpoints cause of over 1600 illustrations covering more than INTRODUCTION TO PRINTED CIRCUITS $ 2.70 problem according to 24 sound symptoms, 3400 topics. In addition to the many ques- $10.00 213 pix symptoms and over 75 raster tion and answer presentations on ampli- BASIC ELECTRONICS 15 vols.) symptoms. Checks for each problem are fiers. mikes, speakers, coils, etc., there is INTRODUCTION 10 COLOR TV S 2.70 noted. Also presented are explanations of a 122 page section on test measurements rapid alignment technique and UHF serv- and a 120 page section on making audio INTRODUCTION TO UHF CIRCUITS icing. Soft cover, 70 large pages. Price $2. measurements, including practical test 8 COMPONENTS $ 7.50 hook-ups. Hard cover, 1278 pages. Price 519.95. PROFITABLE RADIO TROUBLE. SHOOTING 5 5.95

ELEMENTS OF MAGNETIC TAPE S 7.95 RECORDING Also See New Books on Page 100 MANDL'S TELEVISION SERVICING 5 6.50 CUT HERE CLOSED CIRCUIT 6 INDUSTRIAL TV S 4.95 ELECTRONIC MARKETERS 11-59 ELECTRONIC MUSICAL INSTRUMENT (ELECTRONIC TECHNICIAN Book Dept./ MANUAL S 7.50 480 Lexington Avenue REPAIRING RECCRD CHANGERS S 5.95 New York 17. N.Y. I TRANSISTORS IN RADIO 1 plan to build my technical library. Please send me the books have indicated AND TELEVISION S 7.00 below. You will pay postage. I understand that if 1 am not satisfied with any book any reason, 1 may return it to you prepaid in good, clean condition within HANDBOOK OF BASIC CIRCUITS, for TV, FM, AM $ 7.50 7 days of receipt and receive a complete refund. Enclosed is my check or money order, in full payment, made out ro ELECTRONIC PINPOINT COLOR IV TROUBLES MARKETERS. Itr IN 15 MINUTES S 5.95 _Home Air Conditioning -Servomechanism AND CLOCK RADIOS S 2.75 PORTABLE Installation 8 Repair .... @ $ 3.50 Fundamentals @ 5 5.50 PINPOINT RECORD CHANGER _Industrial Control Circuits .... @ $ 3.90 -Obtaining and Interpreting TROUBLES 5 3.95 _Rider Combination Manual .. @ $27.00 Test Scope Troces @ 5 2.40 _Fundamentals of Radio _Small Appliance Servicing @ S 4.50 TV DOCTOR 5 1.00 Telemetry @ $ 2.95 _Servicing Transistor Radios .. @ $ 2.90 S 1.80 VACUUM TUBE CHARACTERISTICS _Shoot TV E. Radio _Electronic Communications .. @ $13.00 Trouble Fast @ $ 1.50 _TV Consultant @ $ 2.00 BASIC PULSES S 3.50 S _Basics of Digital Computers . @ $ 7.50 ..,..,...100 Electronic Circuits @ 2.00 STEREOPHONIC SOUND S 2.25 _Impedance Matching @ S 2.90 _Aud,-o Encyclopedia @ $19.95 _Radio Operator's License FUNDAMENTALS OF TRANSISTORS $ 3.50 O 8 A Manual @ $ 6.60 BOOKS IN PREVIOUS ISSUES: INDUSTRIAL ELECTRONICS HANDBOOK $22.50 _How to Install 8 Service Auto Radios @ $ 3.25 REPAIRING HI-FI SYSTEMS S 3.90 _Marine Electronics Handbook . @ $ 3.95 A -C CIRCUIT ANALYSIS S 1.80 _Guide to Mobile Radio @ $ 2.85 _How to Run a Small Business @ $ 4.95 AUDIO MEASUREMENTS $ 2.90 ELECTRONICS IN INDUSTRY S 8.50 Enclosed is total payment of S-- q$ add 3% sales tax) HOW TO SERVICE TAPE RECORDERS $ 2.90 (1f you have New York City address,

RADIO ENGINEERING HANDBOOK $25.00 Name To order above book:, write in title and price on coupon. Address

City Zone State TV Technician TAYLOR THURMAN Explains .. . "In Precision Circuitry,

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.r Stop Call-backs with these Quality Mallory Components

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Gems -5 rugged. moistureproof, FP Electrolytñcs-The Mallory FP Sto-Loc* Controls-New Sta-Loc Mallory "Gem" tubular capacitors -the original 85°C capacitor-now design enables your in distributor to an easy -to -use dispenser that has improved shock-resistant con- custom build, in just 30 seconds, keeps your stock fresh and clean- struction and leakproof seal. Its over 38,000 combinations-elimi- easy to find-no more kinks in lead etched cathode construction- nates waiting for out -of -stock wires. They're your best bet for standard in all FP's-assures hum - controls. You can replace the line outstanding service in buffer, by- free performance. switch by itself, without unsolder- pass or coupling applications. ing control connections.

54 ELECTRONIC TECHNICIAN November, 1959 here's Nothing Like Mallory RMC Discaps"

"When it comes to replacing ceramic When you're looking for high quality, capacitors, we always use Mallory RMC sensibly priced components, check Discaps. Time and again, they've proved with Mallory. You get the widest selec- dependable. For TV tuners and other pre- tion of parts in the industry . . . and cision circuitry the extra quality built into every Mallory component is service - Mallory makes the difference between a engineered: your assurance that the satisfied customer and money losing parts you replace will be in service for call-backs." a long, long time.

Taylor Thurman has operated his own TV repair C. service for more than 10 years. The Air Force gave him P ,5° early training in electronics. At Scott Field, he became a Communications Chief. Later on, he attended the G.E. Television School in Syracuse. At his Richmond, {.: Indiana, location, he now has two technicians helping him in radio and TV sales and service ... operates two service trucks. Prompt attention to service calls 1.? and use of quality replacement parts are the chief Get your RMC Discaps-in :he handy 3 7 5 file card factors to which Thurman attributes the steady five-pack-from convenient display at your Mallory growth of his business. .distributor's store.

IMIPR.MAL_ORVBCOoIco 5Tradenuuk of R.aüo tfattrials Co., o Division of P. R. Mallory & Co. Inc. ALLORY.

8 CO. Inc.. INDIANAPOLIS 6. INDIANA

TC Tubular Electrolytic Capacitors Gold Label* Vibrators-On critical Silicon Rectifiers-New Mallory -economically priced electrolytic auto radio servicing, use the Mallory design gives far longer life, lower filter capacitors with a reputation Gold Label Vibrator. It gives forward voltage drop, and reverse for doing an excellent job. They longer, trouble -free service life. leakage current than conventional have been proved in performance Mallory Gold Label Vibrators fea- types ... exceed the requirements and are backed by years of Mallory ture Mallory exclusive buttonless of military humidity tests. In con- experience. Also special TCX type contact design. venient kits for replacement of available for -55°C. *Trnderaark selenium rectifiers in radio and TV.

E.LtCTRONIC TECHNICIAN November, 1959 55 ESI GUN CONTROL A small compact device with two FREE LITERATURE adjustments, called the gunchoke, claims to reduce the temperature of soldering guns to 500° or 600°. The To receive the literature below without charge, simply circle device, made in a number of models, the numbers on the coupon corresponding to the items is reported to prevent damage to printed circuits and laminated wiring of interest. Cut out and mail to ELECTRONIC TECHNICIAN, boards; eliminating the need for a 480 Lexington Ave., New York 17, N. Y. slow -heating iron of unknown tip temperature. Electric Soldering Iron Co., Deep River, Conn. (ELECTRONIC Parts & Equipment: Special rectifiers with emphasis on their ap- TECHNICIAN 11-31) 1 emphasis has been placed on plication in precision circuitry. industrial electronic equipment in a (5B11: P. R. Mallory & Co. Inc.) G -C CEMENT new 1960 catalog. 40,000 items, for use by all segments of the electronic Power Tubes: The Machlett The "Epox-Cement," 2 tube base field, are listed in the catalog's 528 6 resin and hardener kit, is said to have power tube line, for industrial a bonding strength of 3,000 lbs. per (1B11: Allied Radio pages. Corp.) and broadcast applications, is fea- square inch, on metals, ceramics, tured in a new folder. Pricing, policy, wood, glass, plastics and other mate- Transistors & Picture Tubes: availability, interchangeability and rials. It is reported the cement cures 2 "How to Test Transistors," specifications are included. (6B11: bulletin PA -219, contains simple re- Raytheon Co.) sistance checks which provide a fast evaluation of functioning ability. Test Equipment: Individual a 23" x 29' wall Bulletin PF -288, 7 pieces of literature are avail- chart, provides mechanical and elec- able on the following: Three -tube trical characteristics for more than testers: VTVM: Dynamic transistor 360 picture tubes. Replacement types checker; In -circuit current checker: Electronics) are listed. (2B11: CBS 100% accurate flyback checker; and Battery eliminator. (7B11: Seco Mfg. Master Antenna Systems: Co.) 3 "Recommended Practices for the Design and Installation of Master Antenna Systems," brochure F-1106, 8 Transistors: Application Notes, provides 6 pages of information in- "Classification of Junction cluding a conversion table. (3B11: Transistors," covers the following four major categories: grown, alloy, at room temperature without shrink- Entron, Inc.) age and is claimed to be resistant to electrochemical, and diffusion-ac- water, solvents, heat or cold, providing Carbon Resistors: Literature is cording to the technique used to excellent dielectric properties. List 4 available covering the new re- fabricate the emitter region. (8B11: $3.25. G -C Electronics Co., 400 S. volving Resist -O -Round, an upright Texas Instruments, Inc.) Wyman St.. Rockford. Ill. (ELEC- metal display rack offered free with TRONIC TECHNICIAN 11-33) any four of the firm's handy-pak TV Antenna: The new patented carbon resistor assortments. It pro- 9 Color'Ceptor TV antenna is Motorola POWER TRANSISTORS is vides finger-tip convenience. (4B11: described in a brochure which Two germanium, PNP, alloy junction International Resistance Co.) prepared for the consumer. Dealer power transistors, in low and high sales material, tieing in with con- voltage types; for audio amplifiers, Electronic Components: Litera- sumer magazine and TV network power supplies and voltage converter 5 ture is available covering advertising, is available. (9B11: applications, have been added to the capacitors, controls, vibrators and Winegard Co.) line of 3 ampere power transistors.

CUT HERE

Use this coupon, or your letterhead, before December 20, 1959

1. Circle free literature numbers. 1 2 3 4 5 6 7 8 9

2. For more data on new products and bulletins write code numbers

3. Fill in your name and address. Mail promptly. Name Position Firm The types 2N1359-60 and 2N1362-65, are designed to meet stringent military Address and industrial specifications. Motorola, Inc., Semiconductor Products Div., City Zone State Dept. HVT, 5005 E. McDowell Rd., Phoenix, Ariz. (ELECTRONIC TECH- NICIAN 11-37)

56 ELECTRONIC TECHNICIAN November, 1959 , , " Í iñ-TV Make TwicéThé Pró fit! -; -Tróüble=Shóótiñg..: THIS EASY SIGNAL INJECTION

POINT-TO-POINT' _ DIRECT VIEWING 1e WAY_ .L :;* i d

MODEL 1075 TELEVISION ANALYST Solve Rough Sweep Output Problems New Technique Makes TV Servicing Easier, Faster, More Profitable NEW Model A107 Thousands of service technicians already save thousands of hours every day with the amazing ` I DYNA-SWEEP B&K TELEVISION ANALYST. Enables you to inject im77 CIRCUIT ANALYZER your own TV signal at any point and watch the 1 D V .11 SZE!' 0 resulting test pattern on the picture tube itself. Saves many hours of service work. Makes it quick and easy to isolate, pin -point, and Provides verticol and horizontal correct TV trouble in any stage throughout the sync and driving pulses that enable video, audio, r.f., i.f., sync, and sweep sections of you more easily and quickly to black & white and color television sets-including check out every stage in the sync intermittents. Makes external scope or wave -form and sweep sections of o television interpretation unneccary. Enables any serviceman receiver. to cut servicing time in half, service more TV sets in less time, really satisfy more customers, and make more money. Color generator provides Tracks down troubles in the horizontal and vertical.ot.tput circuit both rainbow pattern and color bars. including defective output transformer and yoke; checks for shorted turns, leakage, opens, short circuits, and continuity. Includes unique MODEL 1075 TELEVISION ANALYST. Complete with standard high -voltage indication. Eliminates trial and error replacements. test pattern, white dot, white line, and color-ba- slide trcnsparencies, and cne clear acetate. Net, $25995 Model A107 Dyna-Sweep. Companion unit for use only with 55K Model 1075 Television Analyst for driving source. See your B&K Distributer or Write for Bulletin ST24-T Net, $49.95 Model 1070 Dyna-Sweep. Some as Model A107 but has B s K MANUFACTURING its own horizontal and vertical driving pulse, and is used inde 1801 W. BEILE -PLAINE AVE CHICAGO 13, ILL. . pendently of the Model 1075. Net, $69,93 Canada: Atlot Roam Corp . 50 Wing6td, Toronto 10, Ont. Export: Empire_Enporters, 277 Brood ay, New York 7, U.S.A. ' tELECTRONIC TECHNICIAN November, 1959 57 Want more capacitor for your dollar? Here's how: Cornell-Dubilier offers you a "preferred -type" program on twist -prong electrolytics. Now, a relatively few types fill over 90% of all replacement requirements. You need less-to do more. Fewer types means improved production efficiency, lowered costs-savings to you. How is it done? Instead of producing hundreds of types with odd and critical capacitance and voltage ratings, each "preferred type" carries the highest value and rating called for in each category. In most cases you get more capacitor at lower cost-plus added safety factor, improved per. formance and "call-back" protection. To get more capacitor for your dollar, ask your C-0 Distributor about Preferred Type Twist-Prong Electrolytics or write for "preferred type" catalog to Cornell-Dubilier Electric Corporation, South Plainfield, New Jersey. .-50..YEAR.S CORNELL-DUBILIER ELECTRIC CORP. .PROGRESS".. THE BEST IN ELECTRONIC COMPONENTS

58 ELECTRONIC TECHNICIAN November, 1959 . CóYrríéll-Dúbiliér°n

Rotors "

` r

a 4 J e'I ,;_ '

turn; profits your: way,

Whether you are after original installation bus ness or replacement sales, you'll find the performance, The C -D brand name on a vibrator is your guarantee of dependable rokr best -suited for any job in the complete last, you can use long trouble -free service. Because C -D vibrators are built to CDF line. Consider the heavy-duty TR-4 rec- them will full confidence. That's why it pays to reach for a C-D when a vibrator ommended for areas where íce-storms, heavy replacement is called for. snowfalls and strong winds impair the efficiency of antennas turned by ordinary rotors. Remember, too, that there's a C -D vibrator type for every make and model car Your CD Rotor distributor is ready to show you on the road. And the C -D VIBRATOR REPLACEMENT GUIDE makes it quick and why the TR-4 and other CD Rotor are the easy for you to select the exact type required. Ask your local C -D distributor for easiest to install... most satisfactory in the =ree VIB-3, or write to Cornell-Dubilier Electric Corp., S. Plainfield, N. J. a copy of long run. Write to catalog NR to Cornell- Duhilier Electric Corp., S. Plainfield, N. J. CORNELL-DUBILIER 50 YEARS J 50o YEARS OF OF ' ELECTRIC CORP. PROGRESS PROGRESS - THE BEST IN ELECTRONIC COMPONENTS

ELECTRONIC TECHNICIAN November, 1959 59 repetitive cith each heartbeat. They 3 signals displayed simultaneously on Human Heartbeat cannot be used in a digital computer a scope, as shown in Fig. 2, and se- until they have been changed from lects a cardiac cycle for conversion analog (continuous wave) to digital to digital form. Only one cat diac style 45) (Continued from page (numerical) form. is normally necessary for analysis, changed to numerical (digital) form. For conversion, the analog tape re- however, if a hearbeat appears erratic, The resulting numbers are recorded cording contains 10 or 12 heartbeats the technician may record more than on a second magnetic tape for compu- on three FM channel and the patient's one cycle. The digital record is made ter use. identification on 1 voice channel. in only a few seconds. An electrocardiogram produces a Wide -deviation FM was chosen for In the conversion process, data is series of three continuous waveforms, recording the heartbeat signals be- sampled periodically. Each of the obtained from electrodes placed on cause the frequencies to be studied three waveforms is sampled 1,000 the head, chest, and ankle of the are between d -c and 200 cps. times each second, and a binary num- patient. The waveforms are essentially A medical technician monitors the ber is formed by the converter to represent the magnitude of each wave at the time of sampling. These magni- tudes are recorded on digital magnetic tape to be used in a high-speed elec-

b r°C.t° I. ,

VOM and VTVM ro.r' k1 .,. Fig. 2-A scope display of 3 simultaneous signals of the patient's heartbeat is :t ty4'... monitored when converting to digital form.

tronic computer, See Fig. 1. Approxi- mately 1,000 cardiac cycles can be 1Si" .. et, ffi ef 4 recorded in this manner on only one 455A .., ` z reel of digital magnetic tape. The data could also be printed on punched cards or plotted on paper charts. As additional experience in digital YOU transformation is obtained, the recording system may be expanded to include other clinical data. The use CAN'T "Most practical of high-speed computers for both di- engineering achievement" agnostic and statistical analysis should prove a for BURN ... the consensus of comment by W powerful tool the expert technicians everyehere. Cr study of heart disease. This modern, reliable and easy -to -use VOM has IT OUT! the distinct advantage of automatic overload protection without down -time.... Eliminates the ostly hazard due to accidental mis-set of function and ranges. Saves you time all-around and increases your servicing profits. $69.50 (Available without automatic reset as Model 457 Co $43.95)

True %/ UM and Capacitance Tester Features professional size 9" meter. Measures DC volts; AC RMS volts; AC Peak to Peak volts; 10 ops to 200 megacycles; 0.1 ohm to 10,000 megohms; 50 mh to 100 henries; DC mils to 1200; -20 to +25 decibels. Includes high frequency probe and built- in power supply.... The most accurate and dependable instrument of its kind. $149.00 Ask your distributor for a "Hickok -demonstration"

,THE HICKOK ELECTRICAL INSTRUMENT CO.1 d7."totio

60 ELECTRONIC TECHNICIAN November, 1959 Harman-Kordon STEREO KITS ATL STEREO CONVERTER Following a year of research on A hi-fi stereo converter. with 14 problems of kit design and assembly, watt peak output, labeled "True - a two channel stereo amplifier, Cita- Phonic," model SC -7, is designed for in form converting any monophonic phono tion II, is now available kit __. _ -^- and is reported capable of producing equipment to stereo sound. The converter consists of preamp., amplifier, three speakers and electrical crossover. Housed in a wooden cabinet, the unit includes stereo cartridge, 14 ft. plug-in ee! cable, hardware and instructions. Sug- gested list 559.95. Affiliated Television Labs., 39 Roselle St., Mineola; N. Y. (ELECTRONIC TECHNICIAN 11-22)

Citotion II frequencies as low as 5 cycles without phase shift and beyond 100,000 cycles without instability. The amplifier is I\ rated at 60 watts/channel. Also introduced in kit form is the Citation I, a stereo preamplifier control center featuring a blend control to overcome the transistor -radio -_.-----__ tester

M,, . woe.

tf 8f0

Citation I

"hole -in -the -middle" effect of many stereo records and providing control and outlet for a third stereo channel. Amplifier kit $159.95; wired $219.95. Hickok -engineered Preamp kit $139.95; wired $239.95. Harman-Kardon, Inc., 520 Main St., ... for fast and complete Westbury, N. Y. (ELECTRONIC troubleshooting of transistor radios. TECHNICIAN 11-26) A combination AM signal generator and tuned receiver for signal tracing. 'Transistor test circuit ... measures Du Mont SCOPE CRT leakage and gain. A high writing rate 51/4" h -f oscillo- Fast ... Accurate ... Complete 5119 scope tube, K-1546, has been developed to record single millimicrosecond tran- sients. Using electrostatic focus and (ENGINEER'S TRANSISTOR ANALYZER deflection, writing rates of 1.2 cm per milli -It -sec. can be photographed on Accurate aid easy to use. Permits evaluations 35 mm super xx film with a lens of a transistor to determine its ability to function setting of 1.5 and an image reduction under specific circuit conditions. of 4.2:1. A potted cable is provided to Model 850 5138 prevent corona or arc -over. Allen B. Du Mont Labs., Electronic Tube Sales Ask your distributor kr a "Hickok-demo.stration"... Dept., 750 Bloomfield Ave., Clifton, N. J. (ELECTRONIC TECHNICIAN 11-30) 1THE HICKOK ELECTRICAL INSTRUMENT CO. Cesetonde'Ohio

ELECTRONIC TECHNICIAN November, 1959 61 Choosing A Mobile Radio System

(Continued from page 44) for reducing noise. The success of antenna, power relay, fuse block, many installations often depend upon speaker, control head, and micro- solving this problem. phone should he made before beginning the installation. The driver After The Installation should be able to reach the necessary controls without difficulty, and proper Installation is only part of the clearance for removal of all units story for successful operation. The should be provided. operator must be taught how to use In a trunk installation the cables his radio. For most installations the are usually brought through the steps for operator adjustment are: trunk wall, under the floor mat, and 1. Operate the radio only with the up under the RESIST-O-ROUN D dash. The speaker may motor running to prevent a dead he mounted on the dashboard, steer- battery. IT REVOLVES ! ing column or fire -wall. The po\%er 2. Turn on the equipment. After cables should be kept away from FREE ! with any of 4 Handy -Pak ex- a short warm-up (30 seconds) cessive engine heat. A good, firm Carbon Resistor Assortments turn squelch to minimum posi- ground connection is important. This sion. 20 Values to should be the battery ground if 3. Adjust the volume for moderate possible. Figure 2 shows two types hissing sound. 1440 to $ 2880 Dealer Net of installations. 4. Adjust squelch until just beyond Finger-tip ConvenienceAll-Metal Antenna vv here the hissing sound disap- pears. Order from Mounting the antenna 5. The equipment is ready to re- your IRC often poses Distributor a problem, but a rear fender mount ceive any message; to transmit, is generally the preferred spot, being press the microphone button INTERNATIONAL RESISTANCE COMPANY near the when the air is free of DISTRIBUTOR SALES DIVISION trunk -mounted transmitter. other 414 N. 13th STREET PHILADELPHIA B, PA. Antennas may also be mounted on the messages. rear bumper or roof. When mounted Regardless of the type mobile sys- on the roof, the antenna lead is some- tem chosen by the technician, or the NEW times passed between the inner roof system variations devised, proper op- and upholstery with an electrician's erator training provides the best SOUNDCRAFT "fish tape" or "snake." A good ground start to a trouble -free and efficiently connection for the antenna is im- operated mobile radio system. The portant. A front -mount unit has the technician's own experience and in- Cn n speaker and controls built-in, and dividual equipment service -operation the microphone is mounted near the data will strengthen his abilities in 0CA,,4>¢ driver for convenience. Installations this direction. Remembering that a .r,...... ,., in a truck may he behind the seat, useful piece of equipment is worth- . -u1 tu, - ^R =" - less unless ELECTRICAL $UUNfl under the seat, on top of the cab, or properly operated, in- behind the cab. In the case of an out- structing personnel in the operation i e^ e FOR EVERY side of their equipment usually becomes I ,4 mounting, a waterproof case is J . ELECTRICAL required. a mandatory phase of the mobile ra- "! dio system wpCNAFr TAPING JOB! business. RAP SUtl Battery "I=Z:'`,1 R9T M Battery charging requirements vary Here's the electrical tape that's got everything! depending upon radio use, the equip- COMPLETE PROTECTION ment load, and the amount of high- AGAINST INSULATION FAILURE speed driving. With a load of more Tremendous durability Perfect con- than 50 to 60 amperes, heavy duty formability High dielectric strength generators are usually required to (10,000 volts) Excellent adhesion and maintain battery staying power Non-combustible Ex- charge. Battery- treme resistance to aging High voltage should not be less than 5.8 resistance to temperature and humidity volts for a 6 volt system and 11.6 for extremes and remarkable adaptability a 12 volt system. to a wide variety of uses! Noise reduction in vehicles is usually a problem. Suppressors, NE" "SOUNDCRAFTCOAP. anti- Ones re.tr.aoed static powder and .Danbury, coon. bypass capacitors plus bonding straps between pmts enanefect. t Me ererld's lined magnetic of the car or recording toes truck are all methe:' "It happens every time the picture flops."

62 ELECTRONIC TECHNICIAN November, 1959 ova -VAN IA TUBES...

A 2:7 ,,w, -:.± T-.>iY' 1111y f-,,.-.

I-!I t

#4114 rM

and the new standard for the jet age

Today, every major airline uses cial and industrial applications. They are iden- Sylvania Gold Brand tubes. And in the new tified with a GB prefix and have become one of jet airliners, where the demand for top perform- the fastest growing tube lines in the electronics ance and reliability is more than ever a critical industry. They are manufactured to special necessity, Sylvania Gold Brand types are be- Gold Brand specifications that tailor the highest coming the leading choice. On Pan American's military standards to the individualized require- Boeing Jet 707 Airliners over 27 Sylvania types ments of commercial and industrial equipment. Are in daily use. For premium quality and performance in any Sylvania has developed a line of 47 Gold electronic application, use the tubes with the Brand tubes specifically designed for commer- Gold Brand, from Sylvania.

SYLVANIA ELECTRIC PRODUCTS INC. 1740 Broadway, New York 19, N. Y. In Canada: Sylvania Electric (Canada) Ltd. SYLVAN E4-9 P. O. Box 2190, Station "O," Montreal 9 Subsidiary of GENERAL TELEPHONE & ELECTRONICS

ELECTRONIC TECHNICIAN November, 1959 83 the scope at fairly high gain, and look panied by signal attenuation, and the Audio Troubleshooting for a sine -wave pattern on the scope vertical deflection of the ellipse is not screen. Completely effective bypass as great as the deflection of the and decoupling capacitors are "cold" straight-line (Continued from page 38) pattern obtained in the and produce no screen deflection. mid -band frequency range. This re- are too small, low -frequency phase The most common type of high - sults from the fact that the reactance shift can also result. The phase shift frequency distortion is lagging phase of the stray capacitance decreases at is caused by an appreciable voltage shift. This is caused by load resistors the higher test frequency, and par- drop across the capacitor. This atten- or impedances which are too high in tially by-passes the signal to ground. uates the signal, in addition to causing value. As the frequency is increased The plate resistance of the amplifier phase shift. The offending capaci- beyond a certain point, the stray ca- tube is in series with the stray capacitors) can be located by applying the pacitance provides a partial capacitive tance, which causes the lagging phase vertical -input leads of the scope load. shift. across each capacitor in turn. Operate Lagging phase shift is also accom- To improve the high -frequency response of the amplifier, it is necessary to reduce the total load impedances-

Solve Rough Sweep. 'Output Proble res:

IN- MINUTES -. INSTEAD OF, HOURS!.

;

Fig. 7-Phase angle is measured by counting NEW squares on scope graticule to obtain the DYNA-SWEEP ratio B/ A, Sine of angle is equal to B/A. \ CIRCUIT ANALYZER stray capacitance and total circuit re- ¡"..1a sistance to ground. Although this will T.j---- a result in a loss of gain, the amplifier will then have a better frequency 1. Provides composite synchronizing Quickly solves tough output servicing signals (negative or positive) to inject problems that have always plagued the response. directly in each sync stage. TV serviceman. horizontal Provides and From a practical point of view, con- a. Provides plate drive signal to check vertical sync and driving pulses that complete vertical output circuit, sidering results desired and equip- including V.O. transformer. make it easy to check out every stage in the sync and sweep sections of a television ment facilities, the easiest way to test, 71. Provides vertical yoke test signal to receiver. determine if vertical yoke windings Tracks down troubles in the trace and locate distortion faults in are defective. horizontal and vertical output circuit, 4. Provides horizontal plate driving including defective output transformer high-fidelity audio amplifiers, is at signal to directly drive TV horizontal and yoke. Checks for shorted turns, the same time the best way. More output transformer circuit. leakage, opens, short circuits, and S. Provides 8+ boost indicator. continuity. Gives unique high -voltage elaborate tests are possible using 6. Provides unique high -voltage indicator. indication. Eliminates trial and error waveform analysis, but they are based 7. Provides sensitive tests for each replacements. Saves of the horizontal output components, many hours of service upon fundamental methods described including N.O. transformer and work! Pays for itself over and over again. here. yoke. Immediately 7s their true condition, good or bad. Model 1070 Dyne -Sweep. Net, $6995 Transitron TRANSISTORS MODEL A107 DYN A -SWEEP CIRCUIT ANALYZER for use with BM( Model 1075 Television Analyst Announced is a new package development in the firm's high power silicon Functions like the Model 1070 above, but is designed as a companion unit for transistor line. The 11/16" hex -nut sin- use only with B&K Model 1075 Television gle stud construction contributes to Analyst for driving source. Makes your greater strength and ease of mounting, Television Analyst more useful and and electrical insulation of the device valuable than ever. Net, $49.95 from heat sink is more readily accomplished. High temperature reliability is assured. Features include: low thermal resistance; good beta linearity and See your B&K Distributor or Write for Bulletin ST24T switching characteristics; good high frequency beta and low saturation voltage. B&K MANUFACTURING CO. Described in bulletin TE -1355M, TE - 1801 W. BELLE PLAINE AVE CHICAGO 13, ILL. 1355N. Transitron Electronic Corp., 168 Albion St., Wakefield, Mass. (ELEC- Canada: Atlas Radio Corp.. 50 Wingold, Toronto 10, On,. Export: Empire f.porter., 277 Broadway, New York 7, U.S.A. TRONIC TECHNICIAN 11-44)

64 ELECTRONIC TECHNICIAN November, 1959 Firefighting is for firemen - not servicemen /1 y

: -1 1 \o 1.,===`-r ^5.

`1 I

Customers really burn when they have to call you back because of a premature failure. And while you're playing fireman, the profit on your next three service calls goes up in smoke. Tung -Sol tube quality is good insurance against callbacks. They're made to the highest specs of leading radio, tv and hi-fi set manufacturers. You'll find it good policy to keep that caddy full of Tung -Sol tubes. Tung -Sol Electric Inc., Newark 4, N. J. Tell your jobber you'd rather have TUNG-SOL 21f,cWgia4 TUBES TRANSISTORS DIODES

ELECTRONIC TECHNICIAN November, 1959 65 r Tips for Home and Bench Service

Transformer Repair to repair of defect. this type replace it with a 68K 1/2 watt. At the Remove Slug -tuned i -f and similar type the defective transformer same juncture add a 47K 1/2 watt re- transformers used in TV and radio, from the chassis and then remove its sistor from pin 6 to ground. Remove require capacitors to form parallel aluminum shield, thus exposing the the 18K 2 watt resistor in series with resonant circuits. On the older types coils and capacitor sandwich. Handle the new screen load resistor (68K) these were regular capacitors which the unit carefully as many of these of the 6AU6 sound i -f and substi- were wired inside or outside the coils are wound with very fine wire tute a 22K 2 Watt. transformer can. On current type which is easily broken. Next, grip the This problem may also arise on transformers the capacitors are sandwich wafers with a pair of long - "HE" and "HJ" chassis when the formed by silver-plating both sides nose pliers, as shown in Fig. 1 and sound alignment is slightly off and of a piece of mica and then sandwich- exert a slight pressure. While apply- the set is used under a strong signal ing it between two plastic wafers at ing pressure, use a clean soldering condition.-Olympic Radio & Televi- the base of the transformer. The pencil to melt the two plastic wafers sion, Long Island City, N.Y. together near the point where the pressure is being applied. Repeat this Short Protector procedure on all four edges of the sandwich. This will restore the pres- Late model RCA TV sets incor- sure contacts. The unit is now ready porate a resistor on the side of the to be reassembled. After the trans- tuner. If the resistor (820 ohm, 1 former is reinstalled a slight touch- up in alignment of the stage may be required. Fusing the edges of the capacitor sandwich in this way makes future fi warping almost impossible at temperatures generally encountered in radio \CAPA CITO R LONG -NOSE SANDWICH PLIERS and TV receivers.-Albert J. Kru- kowski, West Springfield, Mass.

Fig. 1-While maintaining slight pressure Sound Buzz on warped plastic wafers of a coil, heat is applied to correct intermittent failure. On all Olympic TV receivers bear- ing the designations "JE," "JJ," "HE" and "HJ," where buzz in the sound is Fig. 3-"Grasshopper" circuit -breaker acts sandwiching forms the necessary con- encountered on strong signal condi- as a tuner B -I- fuse for late RCA TV sets. nections by pressure contacts. tions, the following changes are rec- I have found that many of these ommended, as shown in Fig. 2: Re- watt) attached to the illustrated transformers, especially those used in ter- move the 1K 1/2 watt resistor from minal board should open, - audio detector circuits, become defec- the tech pin 6 of the sound discriminator and (Continued on page 86) tive clue to warping of the plastic wafers. When this warping occurs it re- leases the pressure contacts and produces intermittents, circuit failure after warm-up, and often complete Fig. 2-Production changes to reduce or eliminate sound buzz in some Olympic TV models. circuit failure. This type of trouble V 3 - 6AU6 SOUND IF V4 -6D16 I MEG is generally caused by mounting the SOUND IF AMPLIFIER 4.5 MC DISCRIMINATOR 5000 VOLUME transformer too close to a heat pro- 5 240V L r CONTROL ducing component, such as a power I/ 5000 (1'14) tube, high wattage resistor, or mount- 4 T AUDIO ing the transformer directly above a IDOK .005 OUTPUT hot tube on a vertical chassis. Trying to obtain exact replacements involves IDDI K 1000n TONE a considerable amount of time and CONTROL CHANGE TH/5 K using a universal replacement gener- TO 68K /0Z--- I\ `?,%DD ally leads to 47K _2_ complications-especially --- 3900V. 2W /OX if the transformer is mounted on a i IBK IOK 2W I +280 V printed circuit board. All these head- ;.CHANGE TH/s TO 22K /O S aches are unnecessary as it is easy WATT

66 ELECTRONIC TECHNICIAN November, 1959 SUPERIOR'S NEW MODEL 83 C. . Tests and Rejuvenates ALL CTURE TUBES ALL BLACK AND WHITE TUBES From 50 degree to 110 degree types-from 8" to 30" types. ALL COLOR TUBES Test ALL picture tubes- in the carton- out of the carton-in the set! s Model 83 - C.R.T. TUBE TESTER ... Total Model 83 is not simply a rehashed black and white C.R.T. Tester with Price $38.50 - Terms: $8.50 after 10 day a color adapter added. Model 83 employs a new improved circuit trial, then $6.00 monthly for 5 months. designed specifically to test the older type black and white tubes, the newer type black and white tubes and all color picture tubes. Model 83 provides separate filament operating voltages for the older 6.3 types and the newer 8.4 types. Model 83 employs a 4" ail -damped meter with quality and calibrated Required, a tester-housed in a single carrying case capable of scales. testing and rejuvenating all picture tubes including black and white and color; 50 degree, 90 degree or 110 degree. A tester Model 83 properly tests the red, green and blue sections of color tubes capable of testing these ever increasing types speedily and individually-for each section of o color tube contains its own filament, efficiently. A tester capable of proving to the satisfaction of the plate, grid and cathode. set owner that the picture tube is definitely good, bad or weak. Model 83 will detect tubes which are apparently good but require To do so the serviceman must be able to instantly switch from rejuvenation. Such tubes will provide a picture seemingly good but the comparative simple testing of a black and white tube to the lacking in proper definition, contrast and focus. To test for such mal- complex requirements for testing each individual section in a function, you simply press the rej. switch of Model 83. ff the tube is tri-gun color tube. weakening, the meter reading will indicate the condition. Rejuvenation of picture tubes is not simply a matter of applying a high voltage to the filament. Such voltages improperly applied can strip the salwao«: cathode of the oxide coating essential for proper emission. The Model 83 The Model 83 more than meets the requirements specified above. applies a selective low voltage uniformly to assure increased life with It will not only test every type of picture tube ever made but no danger or cathode damage. will test them for leakage, emission and gas content. Further- Model 83 cores housed in handsome portable Saddle more even if the tube tests "good" Model 83 will help you to Texan case-complete predict the length of time the tube will remain "good." The Stitched Model 83 will also enable you to extend the useful life of a with sockets for all block and white tubes and all color 8so "weak" tube by properly controlled application of rejuvenating voltage. tubes. Only _ SHIPPED ON APPROVAL NO MONEY WITH ORDER- NO C. O. D.

Try it for 10 days before you buy. If I MOSS ELECTRONIC, INC. Name completely satisfied then send $8.50 Dept. 0-688, 3849 Tenth Ave., New York 34, N. Y. and pay balance at rate of $6.00 per . Address I month for 5 months-No Interest or Please rush one Model 83. If satisfactory I agree to within 10 days and balance at rate of $6.00 Finance Charges Added. If not com- ( pay $8.50 City Zone State pletelysatisfied, return to us, no expla- , per month. If not satisfactory, I may return for cancel - nation necessary. lotion of account. All prices net. F.O.B., N.Y.C. L. -- -

ELECTRONIC TECHNICIAN November, 1959 67 New Tubes & Components

For more information, write in ELECTRONIC TECHNICIAN's new product code number on coupon, on page 56.

IRC RESISTORS --> Raytheon TRANSISTORS Twenty-nine devices have been added By using newly developed materials to this semiconductor line, including and redesigning of resistor elements, the 2N1386 and 1387 with freq. cut-off size weight of deposited the and carbon ratings of 60 to 50 me respectively; the resistors has by more been reduced 2N1388, 1389 and 1390 are h -f and video 50%, in than providing space saving amplifiers. The 2N438, 439 and 440 are electronic equipment. Having molded medium current, h -f, high gain NPN insulated casings, the resistors are germanium switching transistors. The available in 1/2 and 1 watt ratings Y4, 2N1366 and 1367 are converter and i -f with values from 10 ohms to 25 meg- transistors. The 2N1275 is a high voltage ohms. International Resistance Co., 401 transistor with ratings up to 100 v. N. Broad St., Philadelphia 8, Pa. Semiconductor Div., Raytheon Co., (ELECTRONIC TECHNICIAN 11-1) Needham, Mass. (ELECTRONIC TECHNICIAN 11-5)

CBS MATCHED TUBES - GE AUDIO TUBE Filling a gap between the power Two matched pairs of audio output ratings of the 6V6 and 6L6, the 7355 tubes, types 7189 and 6L6GC, have been audio output tube performs in the mid - added to this line of audio tubes. Their power output range. With maximum critical audio characteristics, it is in- plate dissipation 18 watts per tube, a dicated, are matched to help in mini- pair in push-pull AB1 without feed- mizing harmonic distortion inherent in back, are rated at 28.5 watts with 2% push pull amplifiers. These tubes aid in reducing distortion below that attain- able with controls, it is claimed. Other tubes in this line are the 6BQ5, 6V6GT, 5881, and 6550. CBS Electronics, Dan- vers, Mass. (ELECTRONIC TECHNI- CIAN 11-2)

RCA TUBES --> Two medium mu tubes, the 6BN4-A and 6FH8, have been added to this line. The 6BN4-A, intended for use as an r -f amplifier, features double base -pin connections for both cathode and grid, which is said to simplify isolation of the input and output circuits. The 6FH8 is harmonic distortion. In single -ended a multi -unit triode and sharp cut-off class Al amplifiers, (d 250 plate volts, tetrode having two additional plates. mu is 7,600 µmhos and maximum signal The tube is for use in harmonic gener- power output is 9.0 watts. General Elec- ator applications. Radio Corp., Harrison, tric, Receiving Tube Dept., Owensboro, N.J. (ELECTRONIC TECHNICIAN Ky. (ELECTRONIC TECHNICIAN 11-3) 11-6)

Corning MINIATURE CAPACITORS Int'l Rectifier DIODES - With a capacitance range from 1 to 10,000 µµf at 300 v., the W-1 through This line of silicon pigtail diodes are W-5 glass wafer capacitors, some small- now available with an insulating Teflon er than the head of a thumbtack, will coating over the diode case. The jackets operate at temperatures from -55 to are said to maintain electrical and me- -f125 C. The units are available with chanical properties from -67 to +250° leads for soldering direct or it can be C, providing diode case insulation in connected with fine wire. The two "close -quarter" applications such as smallest units, W-4 and W-5, are avail- printed circuit boards, computers and able with high temperature leads under data-processing equipment. Price 10Q designation WL-4 and WL-5. Corning above diode list. Int'l Rectifier Corp., Glass Works, Electronic Components 1521 E. Grand Ave., El Segundo, Calif. Dept., Bradford, Pa. (ELECTRONIC (ELECTRONIC TECHNICIAN 11-4) TECHNICIAN 11-7)

68 ELECTRONIC TECHNICIAN November, 1959 \ V11111111rllr*/ (4' \°\ /l¡. bli.r y :` ¡ o,o ¡!%i. V <>". T o v o's \-. ..o i A

uNgREA KABLE_-,= =

PRACTICAL

sise coMpaCTaetuot shovss Pic+ire

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I % r ' 111f I ; - BUSS Fuse SIAK-PAK An On -the -Job Fuse Assortment Supplies the Right Fuse When You Need It

The BUSS Fuse STAK-YAK offers tray of any BUSS or FUSETRON "PICK A PAIR OF the service man a new, convenient five -in box. way to carry fuses. STAK-PAKS" Serviceman can make assortment Two Assortments Available to Supply It contains fifty of the most popular Practically All Service Needs. fuses, in ten different sizes and types. fit his local needs Standard Fuse Assortment supplies Five fuses to a box, ten boxes in all. The beauty of the STAK-PAK is fuses most in use on popular TV sets. It's NEAT - no loose fuses scattered that empty boxes can he replaced Order Number SP -1. about in the tool box. with same fuses - or assortment can C & N Fuse Assortment supplies the be changed to fit the service -man's popular sizes of these fuses that are II's the most fuses in COMPACT - local needs. especially designed for TV. Order space takes less space the smallest - Number SP -2. than any other type of assortment. Never any need for the serviceman to carry a lot of "slow -moving" fuses While you think of it, make a note It's UNBREAKABLE - sturdy metal around with him. to 'pick a pair of STAK-YAKS" at not fragile plastic. your distributor. - If more fuses are needed the service- It's PRACTICAL - to replace fuses or man just picks up another STAK-YAK '///111'- to change assortments just slide in and arranges it to suit himself. 4ETRON'yMcUR _ 1159 I..,,ro.,ca ,..o..,...... r r.orrow. ,. BUSSMANN MFG. DIV ISION McGraw -Edison Co. USS7' -A% DISONt University at Jeffe rson, St. Louis 7, Mo.

(ELECTRONIC TECHNICIAN November, 1959 69 New Audio Products

For more information, write in ELECTRONIC TECHNICIA N's new product code number on coupon, on page 56.

Jensen SPEAKER Pickering STEREO CARTRIDGE Now available in unfinished form, the The "Collectors Series," models 380A, DUETTE 2 -way book shelf speaker 380C and 380E, are said to be hermet- system cabinets are made of 3/4" gum ically sealed in mu -metal and provide hardwood with banded edges. The four output terminals plus optional system employs an 8" P8-QF woofer metal case ground strip to eliminate and P-35-VAH direct radiator tweeter. ground loops. "A" and "E" are recom- Rated at 25 watts with 16 ohm imped- mended for transcription arms and "C" ance, components are factory mounted. for auto changer tone arms with 3 to Cabinet is 121/2" x 24" x 101/2" and the 7 gram tracking force. F/s ±2 db 20- unit response is said to be 36 to 14,000 20,000 cps. Prices: 380E $60; 380A $34.50 cps. Price $59.95 net unfinished. Jensen and 380C $29.85. Pickering & Co., Plain- Mfg. Co., 6601 S. Laramie Ave., Chicago view, L. I., N. Y. (ELECTRONIC 38, Ill. (ELECTRONIC TECHNICIAN TECHNICIAN 11-12) 11-8)

EICO FM/AM TUNER - Providing FM reception, AM recep- B -T FM RADIO tion or FM -Multiplex stereo reception, A the HFT92 is not a stereo FM -AM tuner popular priced six tube FM radio, since both FM -AM reception cannot Model R-20, featuring permeability be obtained at the same time. Front tuner and slide rule dial, is said to end design is said to provide drift free be designed with drift -compensating performance. Other features include: circuitry for drift -free operation. I" Weighing 41/2 lbs., the R-20 includes a broadband ratio detector and cathode vel follower. Sensitivity 1.5 v for 20 db quieting; frequency resp. 20-20,000 cps ±1 db. Kit or prefactory-wired. Kit $59.95. Wired $94.95. Electronic Instru- ment Co., 33-00 Northern Blvd., Long Island City 1, N. Y. (ELECTRONIC TECHNICIAN 11-9)

GE STEREO AMPLIFIER --- Featuring dual concentric bass and treble controls, the stereophonic amplifier, G-7600, permits individual channel adjustment of bass or treble tones. Other features include friction split type controls; balance, input selector, mode selector, contour control, and rumble filter. Output 20 watts/channel. "full circle" sound system, and is avail- Hum and noise: 58 db r/t 10 It v. able in a number of decorator color Suggested retail price $139.95. General combinations. Suggested list price Electric Co., 1285 Boston Ave., Bridge- $39.95. Blonder -Tongue Laboratories, port, Conn. (ELECTRONIC TECH- Inc., 9 Ailing St., Newark 2, N. J. NICIAN 11-10) (ELECTRONIC TECHNICIAN 11-13)

Asiatic STEREO CARTRIDGE --> A high -compliance medium -output, Knight TAPE RECORDER crystal stereo cartridge, the 80 series, Having pushbutton selection of for general replacement and monaural - record, play, rewind, forward and stop to -stereo conversions, is reported to fit functions, the model KN-4050 dual - standard changers and pickups. Models track tape recorder, provides a choice include 80 -TS and 86 -TS -TB, covering of two speeds -71/2 and 33/4 ips. The narrow record changer arms having recorder is supplied with a ceramic turnover cartridge suspension and in Net mike, 5" reel of tape, and is reported arms having two cartridge mounting to have a frequency response of 50- bosses 1/2" 71/2 flutter spaced on centers, or single II 13,000 cps at ips; wow and hole mount from top of arm. 0.8 v. J \i less than 0.3%, s/n ratio 40 db. Price output at 1,000 cps. Astatic Corp., Con- $99.95. Allied Radio Corp., 100 N. West- neaut, Ohio. (ELECTRONIC TECH- ern Ave., Chicago 80, Ill. (ELEC- NICIAN 11-11) TRONIC TECHNICIAN 11-14)

70 ELECTRONIC TECHNICIAN November, 1959 New Simpson "Add -A -Testers"

Another Great "First" from Simpson d"QDó e _ o / 1 11- Just plug it in

t/-

,. s, 4 f% ,% .. ,Ti _r- _.. ' _--^

Coñverts, your 260* into = = e

= seven different teátérs?! TESTER, Model 650 $26.95 Think of it! A small investment turns your 260 VOM TRANSISTOR Beta Ranges: 0-10, 0-50, 0-250, (F.5.1 . into a whole array of testers-equipment with a quality Beta Accuracy: 3%, with 260 5% nominal !co Range: 0-100 ua that is found only in individual pieces of test equipment Ico Accuracy: *1%, with 260 3% (F.S.) an DC VTVM, Model 651 $32.95 at much higher prices. The secret lies in combining Voltage Ranges: 0-.5/1.0/2.5/5.0/10/25/50/100/ adapter with the top-notch meter and circuitry of your 260. 250/500 Accuracy: f 1 %, with 260 3% (F.S.) Each combination of Add -A -Tester unit and 260 is Input Impedance: greater than 10 megs all ranges TESTER, Model 652....$38.95 goes and TEMPERATURE self-contained, self -powered. Each adapter on Temperature Ranges: -50°F to +100°F, +100°F to r' -T... +250°F off in a jiffy. No gadgets, no complicated connections. Accuracy: with 260 2° (nominal) Furthermore, Add -A -Tester units require only 1/2 to 1/3 Three lead positions provided Sensing Element: thermistor the storage space of individual testers. By reducing bench AC AMMETER, Model 653 $18.95 Ranges: 0-0.25/1/2.5/12.5125 amps clutter, this compactness makes jobs go faster, raises shop Accuracy: 1%, with 260 3% nominal -'i0 to 3000 cycles efficiency. Make your 260 do double duty. Stop in at your Frequency Range: 50 cycles AUDIO WATTMETER, Model 654 $18.95 Electronics Parts Distributor or write the factory for Load Ranges: 4,8,16,600 ohms Wattage: Continuous 25 wefts (8,600 ohms) further information. *Trademark 50 watts (4,16 ohms) Intermittent 50 watts (8,600 ohms) 100 volts (4,16 ohms) Accuracy: r 5a%, with 260 ,10% nominal - mI xl-x Direct reading scale from 17 microwotts to 100 watts ELECTRIC MICROVOLT ATTENUATOR, Model 655..$18.95 COMPANY Ranges: 2.5 microvolts to 250,000 microvolts continuously variable in decade steps Frequency: DC to 20 KC Accuracy: tldb 5208 West Kinzie Street Chicago 44, Illinois BATTERY TESTER, Model 656 $19.95 Phone: EStebrook 9-1 121 Checks all radio and hearing aid batteries up to 90 volts at the manufacturer's recommended load, or I In Canada: Bach -Simpson Ltd., London, Ontario any external load. WORLD'S LARGEST MANUFACTURER OF Note: All Simpson 260 Adapters provide for normal 260 ELECTRONIC TEST EQUIPMENT usage without disconnecting the adapter.

ELECTRONIC TECHNICIAN November, 1959 71 ri GE TUBE MODEL 107 The 12FQ8, labeled a "twin double - NEW FROM TUBE rg TESTER + ti plate triode," is a unique signal - - splitting twin triode receiving tube. DYNAMIC TRANSISTOR k The tube is a nine -pin miniature twin i4r triode with each section having two CHECKER plates. The extra plate in each section y offers an additional output from that stage, making it possible to take two 11/1:1 - - outstanding reliability, accuracy Provides 3 important tests: amplifier types tested for gain by Dynamic Mutual Conductance method-power types tested for cathode current by MODEL Cathode Emission method-all types 100 tested for shorts and grid error by Grid Circuit Test des eloped and patented by Seco. Dynamic Mutual Conductance Test pre -wired to elim- DYNAMICALLY CHECKS WIDE RANGE OF TRAN- inate elaborate set-up. Cathode Emis- sion Test done free - SISTOR TYPES EITHER "IN OR OUT" OF CIRCUIT! by point pin selector method-will not be obsoleted. This new low-cost checker uses an entirely new approach Completely self-contained in portable but a proven Dl N suic principle for checking transistors. carrying case. safely tests PNP and NPN transistors either "in or out" MODEL 101-Wired and factory tested 5139.50 NET of the circuit. Covers wide range of types: small signal including "drift" types, medium power; and power types Provides positive check for 'opens," shorts, and gain-condition indicated by means of a visual indicator MODEL HC -6 plus jacks for meter or scope. Also provides Go -NO -Go test 1NCIRCUIT CURRENT at practical currents-and permits matching of similar CHECKER transistor types. No set-up required-no further leakage isolated outputs from one stage. It is tests necessary. Model 100 is compact, lightweight, com- said to cut in half the number of plete, and ready -to-use ... helps you cash -in on the big tubes needed in some applications. profits in the fast growing transistorized equipment J General Electric, Receiving Tube Dept., servicing field! positive, on -the -spot check Owensboro, Ky. (ELECTRONIC TECH- MODEL 100-Wired and factory tested . . . $19.95 NET of horizontal output current! NICIAN 11-34) This new, low-cost current checker provides simple means for making a FROM positive on -the -spot check of TV hori- NEW zontal circuits. Can be placed into the Superior TRANSFORMER circuit in seconds-no unsoldering of LOW COST,. COMPLETE circuit wiring-immediately indicates A "do-it-yourself" type unit called whether horizontal tube cathode cur- the Flexiformer, is a self-contained rent is within manufacturer's recommended limits. Valuable as a fast, toroidal primary coil, consisting of a TUBE TESTER accurate indicating device whenad- strip -wound silicon steel core with a justing horizontal drive and linearity. coil having 400 turns of #24 B&S wire. Eliminates one of the most common causes of callbacks. Compact, inex- Hand threading a number of insulated pensive, easy to use - MODEL HC-6-W1red and factory tested 512.95 NET

r _ -.\1. -~`

MODEL GCT-t GRID CIRCUIT TESTER 17: GRID CIRCUIT and TUBE MERIT TESTER fast check of critical Complete test coverage of all modern TV tube types as grid" conditions well as all heater type radio tubes including hybrid "control types, using only 5 sockets. Incorporates patented Seco Model GCT-8 checks "control grid" vacuum tubes faster, GRID CIRCUIT TEST plus a reliable CATHODE EMISSION test condition of more accurately than any other tester! using new low impedance low test voltage circuit-also As many as eleven simultaneous checks filament continuity and provides open element checks-automatically! Quickly spots test. One easy -to -read meter indicates results for both grid errors and leakage-stops guess- Grid Circuit and Tube Merit Tests. Two -stage oc ampli- ing, substitution checking, and costly fier isolates meter from tube under test to protect meter- rechecks. Electron -Eye tube indicates turns through the center opening gives to a wide range load faults at a glance. Truly portable. and makes it possible achieve of a wide range of a -c outputs. Unit is currents and test conditions. Complete with portable The perfect companion to any tester and -chart for quick that employs only conventional gas reported to have applications in class- carrying case, pin straighteners, flip and shorts test. Carry it on all calls. set-up data. room, service department, laboratory MODEL GCT-8 Complete kit . . . 519.95 NET and home work -shop. Superior Electric MODEL 18-Wired and factory tested . - . . $69.50 NET MODEL GCT-8 Wired and tested . 529.95 NET Co., 83 Laurel St., Bistol, Conn. (ELEC- TRONIC TECHNICIAN 11-41) rr-' SEND FOR -1 COMPLETE SECO OUTSTANDING RELIABILITY-TOP DOLLAR VALUEI ' STORY ON ... 1 gSECO MANUFACTURING CO. Three Tube InCircuit i 5015 Penn Ave. So., Minneapolis, Minn. Testers Current Checker For more information, write in ELEC- VTVM 0 100% Accurate NAME Flyback Checker Dynamic TRONIC TECHNICIAN's new product Transistor Checker Battery ADDRESS Eliminator code number on coupon, on page 56. Sold Only Thru Electronics Parts Distributors CITY ZONE STATE

72 ELECTRONIC TECHNICIAN November, 1959 THE BIG IDEA ... IN SERVICING

X401 139v141' ª 4% .02Z. B- 5 r

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[ Only Westinghouse has the new i_ E ' _# _ r Circuit Center with i

See-Matic circuit diagram 't

More than ever, Westinghouse is giving special attention circuit diagram is printed right on the work side of the to service technicians. The new Westinghouse "Circuit board...you save time, save work. It's another example Center" is the industry's one new circuit board with a of advanced engineering from Westinghouse. complete built-in schematic. For complete information about Westinghouse Tech - Now you can tell at a glance what type of component Lit Factory Direct Mailing Service, write to Service is connected from point-to-point and its value. Tube Department, Westinghouse Electric Corp.. Metuchen, types and elements are shown ...and all voltage supply N. J., or your Westinghouse distributor. lines and test points are identified. No more "hide and seek" servicing-in many cases you YOU CAN BE SURE-IF ITS «éstinghouse don't even have to look at the manual! The See-Matic Westinghouse Furniture TV & Stereo Westinghouse Electric Corp., TV -Radio Division, Metuchen, N.J. Watch "Westinghouse Lucille Ball-Desi Arnaz Shows"... CBS -Tv, Fridays.

ELECTRONIC TECHNICIAN November, 1959 73 Jerrold FS METER Designed for antenna probing, orietlr.- ing and master distribution system measurements on VHF channels 2 through 13, the TMT portable transis- look what torized field strength meter operates on four small C -cells, weighs 41re $2995 HEATHKIT

buys in -

ó 'Manufacturer S4 of the finest high fidelity \ : electronic equipment E0 I On equipment! in kit form - °AG

, -.. .--r;---- .

, 1 ,G".*Y R ?1 Y74:Ñ7` ' ;;.3`[yKLi - Y- - 1. pounds, and has ranges from 100 to *s`{`t--" __.._ 2,000,000 Itv. The instrument is re- .... ported to respond only to the sync .. signal of the channel being observed ,.a. and is immune to noise. Jerrold Elec-

.1 tronics Corp., 15th and Lehigh Ave., Philadelphia 32, Pa. (ELECTRONIC TECHNICIAN 11-36)

Seco TESTER A complete 14 -watt hi-fi amplifier -preamplifier combination The model 78 tube tester is reported

in one stylish unit . . . and to have a patented grid circuit test at less than half the price arrangement; including cathode emis- you would expect to pay! sion, heater continuity, open element Only test and designed with a VTVM meter- $29.95 ing principle. The portable tester has

14 -WATT HI -Fl ECONOMY AMPLIFIER (EA -3) From HEATHKIT audio labs comes an exciting new kit ... New Styling, New Features, Brilliant Performance! Designed to function as the "heart" of your hi-fi system, the EA -3 combines the preamplifier and amplifier into one compact package. Providing a full 14 watts of high fidelity power, more than adequate for operating the average system, the EA -3 provides all the controls necessary for precise blending of musical reproduction to your individual taste. Clearly marked controls give you finger-tip command of bass and treble "boost" and "cut" action, switch selection of three separate inputs, "on -off" and volume control. A hum balance control is also provided. NOTE THESE OUTSTANDING SPECIFICATIONS: HARMONIC DISTORTION, loss than 2% (20 cps -20 Mc) at 14 watts. I.M. less 1% 4:11 14 DISTORTION, than (60 and 6.000 cps. at watts. FREQUENCY RESPONSE. 20 cps20 be, ± 1 db at 14 watts. HUM & NOISE, mug. phono input, 47 db below 14 watts, tuner and xtal phono input, 63 db bellow 14 watts. 5 is A truly remarkable buy for the beginning or advanced audiophile. sockets, 9- x 101" x 5", weighing less than 6 pounds. is said to provide ORDER DIRECT BY MAIL OR SEE YOUR NEAREST HEATHKIT DEALER complete tube coverage-including all ALL PRICES F.O.B. BENTON HARBOR, MICH. PRICES AND SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE. modern heater type radio tubes. $69.50 net. Seco Mfg. Co., 5015 Penn. Ave. South, Minneapolis, Minn. (ELEC- f es HEATH COMPANY TRONIC TECHNICIAN 11-18) J - Benton Harbor 24, Mich. subsidiary of Daystrom, Inc. many more kits -to choose from! IJ name Send for this free catalog describing over 100 For more information, write in ELEC- easy -to -build kits in address IRONIC TECHNICIAN's new product hi -fl -test -marine and amateur radio fields. code number on coupon, on page 56. city & state

74 ELECTRONIC TECHNICIAN November, 4959 * K-TRAN IS A REGISTERED TRADEMARK THE- FAMOUS -TR AN I.F. TRANSFORMERS

A complete line of the finest I.F. transformers available anywhere at any price. Both standard and miniature sizes in all of the commonly used I.F. frequencies are stocked for immediate delivery. Conventional as well as printed circuit types are available for both vacuum tube and transistorized applications. Original equipment manufacturers will find the K-Tran the ideal choice for new equipment designs thus saving valuable engineering manhours and being assured of a top quality transformer designed by engineers with over 30 years of manufacturing experience in electronic components. The K-Tran also makes an excellent replacement transformer and will give results equal to or better than the original.

Miniature I.E. Transformers for printed circuit transistorized AVAILABLE IN THE FOLLOWING FREQUENCIES applications. These miniature I.F. Transformers have tuned primary and untuned secondary windings. Proper impedance CAT. NO. CAT. NO. Dimensions: 3/4" square x 2" high match between primary and secondary insures optimum Printed Regular performance. Circuit Standard Dimensions: r/Z" scuare x 3/4" high Types Types FREQ. USE CAT. NO. FREQ. SPECIFICATIONS 13-PH1 12-H1 262 KC Input transformer 2031 455 KC 10K Ohm pri. to 600 Ohm Sec., Input 13-PH2 12-H2 262 KC Output transformer 2032 455 KC 10K Ohm pri. to 1000 Ohm Sec., Output 12-H6 262 KC Output transformer with diode filter 13-PH6 2041 455 KC 25K Ohm pri. to 600 Ohm Sec., Input 13-PC1 12-C1 455 KC Input transformer 2042 455 KC 25K Ohm pri. to 1000 Ohm Sec., Output 13-PC2 12-C2 455 KC Output transformer 2051 455 KC 100K Ohm pri. to 1000 Ohm Sec., Input 13-PC6 12-C6 455 KC Output transformer with diode filter SubMiniature I.F. Transformers for printed circuit transistor- 13-PC7 12-C7 455 KC Input transformer for battery radios ized applications. To our knowledge the smallest I.F. Trans- 12-C8 455 KC Output transformer for battery radios 13-PC8 formers in existence. Ferrite cup core construction permits 13-PC9 12-C9 455 KC Input transformers for AC -DC radios º.C2 455 f the use of extremely small shields without adversely affecting KC for AC -DC radios Trenslstor 13-PC10 12-C10 455 Output transformer I Outs.ut transformer operation. A high impedance, tapped primary 12-C11 455 KC IF transformer (G.E.-RTL 143 and 163) winding ccupled to a low impedance secondary provides 12-C12 455 KC Tapped Pri. I.F. transformer 1AF, optimum energy transfer between stages. 12-c45 455 KC Discriminator Dimensions: 3/e" square x s/e" high 134/1 1500 KC Input and interstage transformer CAT. NO. FREQ. SPECIFICATIONS 13-W2 1500 KC Output transformer Sec., Input 6203 -PC 6203 4.5 MC Input or interstage transformer 9-C1 455 KC 25K Ohm pri. to 600 Ohm 1000 Sec., Output 6204 -PC 6204 4.5 MC Discriminator transformer 9-C2 455 KC 25K Ohm pri. to Ohm 6205 -PC 6205 4.5 MC Ratio detector transformer Also a sub -miniature I.F. Transformer for conventional cir- 6206 -PC 4.5 MC Ratio Det. (GE-RTD-026) cuitry using vacuum tubes. A 455 KC intermediate frequency 6207 -PC 4.5 MC Ratio Det. (GE-RTD-025) transforme- which has all the desirable features of the size I.F. and is smaller than a MINIATURE tube. 6208 -PC 4.5 MC Ratio Det. (GE-RTD-020) I O.0 1 I55 KC standard 1463 -PC 1463 10.7 MC Input or interstage transformer INPUT TRAIT Through the use of a ferrite cup core these sub -miniature 1464 -PC 1464 10.7 MC Discriminator transformer I.F. Transformers offer the gain and bandwidth characteristics 1464-wB 10.7 MC Discriminator 900 KC Peak to Peak previously obtained only in larger I.F. assemblies. For AC -DC 1465 -PC 1465 10.7 MC Ratio detector transformer or battery radios. by high 1465-wB 10.7 MC Ratio detector 800 KC Peak to Peak Dimensions: 1/2" square 11/2" 6260 21.25 MC I.F. Transformer CAT. NO. FREQ. USE 6261 21.25 MC Discriminator transformer 10-C1 455 KC Input transformer 6262 21.25 MC Ratio detector transformer 10-C2 455 KC Output transformer 6230 -PC 6230 44 MC TV Converter I.F. Transformer Literature on any of the above I.F. Transformers or our latest 44 MC 6231 -PC 6231 TV First I.F. Transformer general catalog 60 - TV guide 160 - Auto guide 260 - are 6232 -PC 6232 42.5 MC TV second I.F. Transformer available on reauest. Over Radio & TV parts distributors 6233 -PC 6233 42.5 MC TV third I.F. Transformer 2,000 to serve you the world over. 6234 -PC 6234 44 MC TV fourth I.F. Transformer Available Throuah Your Local Distributor BUY WITH CONFIDENCE - BUY MILLER. Miller Quality Products are recognized by the entire electronics industry as representing the finest in workmanship, performance, and dependability. ''Manufactured under KTran patents of and by Automatic Manufacturing Corp., Division of General Instrument Corporation. J. W.°-M_ILLER COMPANY EXPORT REPRESENTATIVE FACTORY - CANADIAN REPRESENTATIVE Roburn Agencies, Inc. 5917 SOUTH MAIN ST., LOS ANGELES1 3, CALIF. Warehouse Stock 431-435 Greenwich Street Phone ADams 3-4294 Atlas Rodio Corporation, Ltd. New York 13, New York SO Wingold Ave. WOrth 6.2130 FAX No. XCM Toronto 19, Ontario, Canada

ELECTRONIC TECHNICIAN November, 1959 75 DEALERS ...SERVICEMEN Pyramid MYLAR DEAL The assortment of 100, type number START YOUR OWN, TUBE BUSINESS with. Ill Mylar 600 d -c w.v. capacitors, consists of 15 each: 0.001, 0.005, 0.01 ltf; 10 each, 0.002, 0.02 and .1 ltf. 5 each, ZAIYTROM "Deal"! 0.0047, 0.047 and 0.05 µf, with 10% Sensational. tolerances. Known as the "sweetheart YOU GET DE LUXE 102 Shell iNF` TH15 TEST -O- M ATI C VFE1rOR ppBTNE swT6isfl2f "S.1i.1u r11J'1 T e3 1 PLUS ZALYTRON "PACKAGE DEAL" OF bsr! 15 0 REC NG TUBES V swiMONEY :1-11

deal," the assortment includes a plastic COMPLETE j°,1:, $245.00 utility box and 2 free pair of ladies nylon hose (stated value $5.) Dealer/ Service technician net: $14.95. Pyramid -- If You Want to Start a New Tube Route dddJ- Electric Co.. 507 26 St., Union City, -- If You Want to Add to Your Present Route ._ N. J. (ELECTRONIC TECHNICIAN -- If You Want to Increase Your Store Traffic `.! 11-38)

Here's a Deal that starts you RIGHT: with a PROFIT as soon as you unpack it! Sencore TRANSISTOR LAB This superb Shell Tube Tester is nationally advertised by the A transistor radio service "lab," con- factory, for dealers, at a net cost of $199.95. When you buy it in our "Package Deal" you are, in effect, getting with it a sisting of three basic units, is reported Complete Stock of Tubes, worth $450 retail, FOR ONLY $45.00 to provide all equipment for servicing - which is actually 90% discount! And when you have sold only half of the tubes, you have recovered your entire original transistor radios. It is said the TRC4 investment, and have begun a PROFITABLE Self -Service Tube will test from Tester Business! transistors hearing aid to car radio output stage types; the WE MAKE THIS SENSATIONAL OFFER TO TO A 102 INTRODUCE WIDER MAR- SOCKETS KET OUR ZALYTRON BRAND QUALITY TUBES-ALREADY WELL-KNOWN AND "ONE -KNOB" CONTROL wy'.++eoe t ,. ,. e...,. RESPECTED AMONG THOUSANDS k4 OF DEALERS AND SERVICEMEN. Xeres all rou need to 45a -'i Service Ttanvs tar Radius WITH TUBES INCLUDED 150 ZALYTRON -ely CaRé THESE IN PoACKAGE DEAL" TESTER Transistor SELF-SERVICE Radio 'Juan. Own. Type 1 12AX7 Service 'Juan. Type 1 654 Lab 1 6BG6 1 1284 1 6AH6 1 1 ÓSA7 024 1 681163 1 6AK5 3 12BA6 %- 183 1 Ó5K7 1 61116 12BE6 5 6A15 6SN7 1 1 IRS 5 1 6BK7A 1 6AM8 2 128147 1 6507 1 155 I 6BN6 1 6AN8 1 12806 1T4 1 618 1 2 6806 1 12BY7 5 6A05 5 6U8 t tu4 2 6B07A 1 12CU6 SOLD 1 6A55 2 6V6 NATIONALLY 1 105 1 6BZ6 1 6A16 1 125A7 3 2 6W4 1%2A/B 2 61317 1 6AT8 1 12SK7 PS103 1 6W6 power supply furnishes power ZAty1RON 1 3C561 1 6C4 1 12SN7 TUBES jV4 5 6AU6 1 to 7V & RADIO 6C86 654 radios during repair and the HG104 5 1 12507 1 6AUB 1 655 NOT 1 5ÁM8 I 6CD6 1000 cycle generator is for signal tracing NEW Tubes, 1 25BQ6 BRAND 1 6AV6 2 6%8 1 5A05 NOT REJECTS 1 6C07 and other purposes. $45.85 net. Service USED 1 6AW8 1 25CU6 FROM I 5J6 1 7AU7 PULLED 1 6CM7 NOT 6AX4 1 2516 Instruments Corp., 121 Official Road, but 2 1 12AT6 EQUIPMENT 3 SU4G 2 6CU6 First Quoit 3 6BA6 2 12A17 2 35W4 Addison, Ill. (ELECTRONIC TECH- ZALTRON'sYty! 1 5U8 1 6006 Why more. 1 3525 poy 1 6BC5 5 12AU7A NICIAN 11-19) once, you'll 5 6J6 Try them 2 1 6BC8 2 5005 always.c 6 AC7M3 1 12AV6 them 1 6K6 buy veryed 2 6BE6 2 5016 we ship i 3 GAGS tube Guar- by our Full Refund Telonic RF DETECTORS antee LIMITED OFFER! XD -3 is a half -wave rectifier covering the frequency range from 1 to 1,000 ORDER NOW, include in remittance full, or 25% Cash with Order balance C.O.D. mc. VSWR is 1.1:1 below 500 mc; 1.2:1 Allow one week for delivery, F.O.B. NYC. This great Offer is for o Limited Time over 500 mc. Impedance is 51 ohms. only-act TODAY, get started RIGHT with ZALYTRON-a respected name in the Tube Industry! With a standard polarity diode (1N21B), the d -c output is negative. Giant New This is one of a new FREE! series of crystal Wholesale ZA/YIRON TUBE CORPORATION Catalog of Radio & TV diode r -f detectors designed specifically Receiving Tubes, Elec-, 220 West 42nd Street New York 36, N. Y. for low VSWR. Telonic Industries, Inc., Ironic Free Components. 1719 W. La Palma Ave., Anaheim, on Request. Telephone: BRyant 9-2542 DEPT. ET -11 Calif. (ELECTRONIC TECHNICIAN 11-45)

76 ELECTRONIC TECHNICIAN November, 1959 Qt.zrzs.-

. rnrru flow... `u..... -

makc_ customers hap f.y

...:ank more money!

r r ._' 4,2 / .w _ ¡- -1011144,, e-. 4y,¡tr, .

'IL

with NEW c-c EXACT REPLACEMENT KNOBS

97 KNOBS TO CHOOSE FROM COVERS ALL 8 POPULAR TV MAKES REPLACEMENTS FOR ON -OFF, VOLUME, FINE TUNING, CHANNEL SELECTOR MODERN SKIN -PACK -PRICE -MARKED FOR YOUR TRADE

(15, Whenever you run across a broken or missing knob on your TV service calls, you can supply an exact replacement that makes your customer happy, gives you extra money on that call. Your nearby G -C jobber is now showing the complete G -C TV Knob line ... with each knob skin -packed, clearly identified, and marked - II` with list price for the set owner's information. It's another great ..I service for you from G -C and your G -C jobber. WRITE today for your free G -C Catalog ... other literature too. GC GC ELECTRONICS CO. ELECTRONICS ! Division of Textron Inc. 1" West Plant: Los Angeles 18, California Main Plant: ROCKFORD, ILLINOIS, U. S. A. .4

ELECTRONIC TECHNICIAN November, 1959 77 Got Transitron SILICON RECTIFIER a bee in your bonnet A ceramic base stud mounted silicon power rectifier, in an 11ít¡' configura- about Ceramic Capacitors? tion, is claimed to eliminate the need for insulating hardware by virtue of an alumina ceramic disc mounted between the top hat assembly and its hex base- These Cen . o ab Hi-Kap® Kits

i= are real honeys! -

J insulating the base from rectifying junction. The ceramic base rectifiers 1 are available in ratings up to 20 wA,, wen-` am- A peres @ 150° C case temperature. Tran- a sition Electronic Corp., Wakefield, Mass. (ELECTRONIC TECHNICIAN 11-42)

Simpson ADD -A -TESTER By plugging in one of seven adapters, known as Add -A -Tester adapters, it is reported any model 260 VOM can be converted into many different test instruments; including transistor tester, d -c VTVM, temperature tester, a -c

You've got a real sweet deal with CENTRALAB Ceramic Capacitor Kits . . and there's no sting to the prices-especially when you get the $4.75 cabinet FREE with each kit!

So that you'll always "bee" prepared, these heavy gauge steel kits contain balanced inventories of the most frequently used values. Individual values are prominently and clearly labelled so you can locate the Hi-Kap you need, instantly. The rigid plastic package permanently separates and protects the units-yet is easily opened to remove a single capacitor. IJ ammeter, audio wattmeter, microvolt So give your distributor a buzz right now, and ask him about these attenuator four honeys: and battery tester. Said to increase versatility of all 260 VOM: the units DDK-200 kit -200 Standard Ceramic Disc Hi-Kaps-$31.10 net are self -powered. Simpson Elec- tric Co., 5200 W. Kinzie St., Chicago, Ill. TCK-80 kit -80 TC (Temperature Compensating) I I i-Kaps-$26.90 net (ELECTRONIC TECHNICIAN 11-20) HVK-150 kit -150 High Voltage Disc Hi-Kaps-$38.60 net Reynolds SOLDERING TOOL D6K-200 kit -200 Tubular Ceramic BC I1i-Kaps-$33.20 net A long handled holder for glass - fiber brush inserts is claimed to make ... and be sure to ask for a free copy of the new CENTRALAB catalog, the soldering of aluminum simple in or write direct to CENTRALAB for it. home, automotive, radio, TV and metal working shops. It is reported that complicated tinning and fluxing operations A DIVISION OF G6OSEUNION INC. are eliminated when the brush is used 902K E. KEEFE AVE. MILWAUKEE 1, WIS. on metal surfaces, with molten solder, . IN CANADA: 669 Bayview Cen . Ave. Toronto 17, Ont. removing oxide for a firm. smooth 0.5952 abi ® joint. In kit form with solder rods, brush refills and CONTROLS instructions. Reynolds ROTARY SWITCHES CERAMIC CAPACITORS Metals Co., Richmond 18, Va. (ELEC- PACKAGED ELECTRONIC CIRCUITS ENGINEERED CERAMICS TRONIC TECHNICIAN 11-40)

78 ELECTRONIC TECHNICIAN November, 1959 MULTIPLÉ-41 Altec TWEETER NOW THE MONEY MAKING. ADVANTAGES OF REACH A direct -radiator tweeter, the 2000B, SOCKET TUBE TESTING ARE, PLACED WITHIN EVERYONE'S is reported to have a frequency response of 1500 to 18,000 cps. By employing a gap suspension mechanical high mit'TUBE TESTER u=k, pass filter, the tweeter is protected FEATURE FOR FEATURE THE 101 REPRESENTS from low frequency signals and is said THE GREATEST VALUE IN TUBE TESTERS Checks emission of over 700 tube types (including OZ4s, series -string TV tubes, gas regulators, auto 12 plate volt, hi-fi and foreign tubes) employing the time proven dynamic cathode emission test principle. Checks for gas content. Checks for inter -element shorts and leakage. Checks all sections of multi -purpose tubes . will pick up tubes with one "Bad" section.

1 3 settings enable a test of any tube in less than 10 seconds. Positively cannot become obsolete as new it tube types are introduced. 31/2" D'Arsonval type meter-most accufate type available ... sensitive yet rugged. 101 17 long lasting phosphor bronze tube sockets. Model $3995 Line isolated-no shock hazard. Dealer Net Variable load control enables you to get accurate readings on all tubes. 9 filament positions. Model AD -i CRT ADAPTER Detachable line cord. available for use with the Model 101 - Handy tube in special back makes the 101 a highly accurate picture chart contained tube tester. A single adapter head en- to eliminate the need for an expensive compartment. furnished ables you to test all black and white pic- crossover network. The tweeter is New tube listings periodically. ture tubes (including the new short neck Housed in sturdy gray hammertone steel 110 RCA emission, 14 watts and has an 8 ohm degree type) for rated at case. shorts and gas content. voice coil. Magnet weight is .45 lb. Size: Width 9", Height 81/2", Depth 23/.". Altec Lansing Corp., 1515 S. Manchester Bears standard EIA warranty on parts and Model AD -1 CRT ADAPTER workmanship. Dealer Net . $395 Ave., Anaheim, Calif. (ELECTRONIC TECHNICIAN 11-23) BY SERVICEMEN THESE SELF-SERVICE TUBE TESTERS ARE RATED,#Í Vocaline DISPLAY VALUE EVERYWHERE FOR PERFORMANCE, DURABILITY AND A clear plastic display case reveal- ing the complete "Commaire" class D, Citizens Radio Communications sys- 20Mod1-eFl SELF SERVICE TUBE TESTER tem, characterized "Inside Story," is offered free to distributors and dealers COMPARE THESE FEATURES WITH ANY SELF- citizens radio corn- now selling this SERVICE TUBE TESTER MADE BY ANY MANUFACTURER AT ANY PRICE Checks quality (emission, shorts and gas) of over 800 tube types, covering over 99% of all TV and radio tubes it use today, including the newest series -string TV tubes, OZ4s, one volt tubes, magic eye tubes, hi-fi and foreign tubes. Cannot become obsolete as circuitry has bern engineered to accommodate new tube types as they are introduced. Completely self-service ... just two settings are required to test a tube in less than ten seconds. Checks each section of multi -purpose tubes. Tests all 6 and 12 volt standard auto radio vibrators. 46 long lasting phosphor -bronze beryllium sockets. Handy push button fuse can be reset manually - never needs replacement. Attractive red and hammer -tone gray durable metal cabinet. Tube compartment with own lock holds over 400 tubes. Tube storage drawers with tube carton dividers and drawer sheets provide for automatic inventory control. Takes only 19"x19" of floor space. Stands 6'1" high. It is reported the Large seven inch easy -to -read meter is extremely sensitive munications systems. yet rugged - is fully protected against accidental burn -out. plastic case reveals the complete Etched aluminum panel always retains its handome ap- chassis, circuitry and parts, for the pearance. interest and information of electronics The most complete tube chart in the field hobbyist or specialist. Vocaline Co. of lists over 800 tube types. Model 201-F New tube listings are furnished periodically. America, Old Saybrook, Conn. (ELEC- (floor model) $15º50 Handy tube substitution guide included with TRONIC TECHNICIAN 11-21) each tester to prevent lost sales due to out of Dealer Net ... 7 J v stock tube types. Colorful window streamers supplied with each AVAILABLE Orr RECORDING TAPE tester to attract customers. ALSO An illuminated colorful plastic display lops the Model 201-C A display assortment of 28 reels of cabinet designed to attract attention. - $counter model) Irish brand tape, said to include all Shipped in one carton completely assembled. popular sizes and types of home re- Bears standard EIA warranty on parts and Dealer Net . .. . $10950 cording tape, is displayed on a revolv- workmanship. ing stainless steel rack using less than two feet of counter space. A "Carousel" See Iroúi local parts jobber. MOW or writé' TODAY for literatue' package consists of types double play x724, long play #601, green band #211 and brown band #195, including both ELECTRONICS CORP:' of, quality electronic products 7' and 8" reels. Orr Industries Inc., ' maítufocture-s ` N.Y-. Opelika, Ala. (ELECTRONIC TECH- pjenelaw, 1' Dept. 1205 ' 77 Searing Ave.,'Mineola, NICIAN 11-27) 79 ELECTRONIC TECHNICIAN November, 1959 r^ Printed Circuit NEW I Servicing (Continued from page 47) fication numbers painted in white. JERROLD ANTENNA To further simplify our work, another page of the manufacturer's set -vice data contains a diagrammatic MIXING NETWORKS view with a component location guide. See Fig. 3. MODEL TX-(*) With all these aids available, why Give Multi -Channel, remo\ e the printed hoards from the All -Direction Reception cabinet? Since the vertical sweep Simultaneously.:.for FM, TV, UHF and Color!

Now multi -set families can have all -direction reception at the same time on one common line! No more rotators or switches ... the versatile Jerrold Model TX-(*) can be used individually or in any combination to reject unwanted channels and to bring in weaker stations bright and clear. They will mix cut -to -channel antennas with a single broad band antenna ... separate individual channels ... mix or separate VHF and UHF ... and mix or separate VHF TV and FM ... all without loss of signal.

n ,Y

9 i ROtDI 4i d a .r Fig. 5-Easy to check tube pins ore identified by Westinghouse 'See-Matic" board. Model TX-(*) $5.95 list

Fig. b-Solid line at left shows easy to remove jumper For isolating B+ troubles in Westinghouse TV printed circuits. .r.+

4 Model TX-(*) ñ with gang plate r-

Jerrold TX's feature: up to 9 antennas on a single down lead high Q band-pass circuit for highest rejection negligible feed-thru loss ... less than a knife switch matched mixing jumpers ... for low VSWR unbreakable attractive housing, complete with hardware universal mounting ... indoor or outdoor

*SPECIFY UNITS DESIRED: any TV channel from 2 through 13; FM; H -E (VHF high -low) or VHF -UHF

J llOtU ELECTRONICS CORPORATION, Distributor Soles Division Dept. PD 196, The Jerrold Building, Phila. 32, Pa. Jerrold Electronics (Canada) Limited Export Representative: CBS International, New York 22, N. Y. LOOK TO JERROLD FOR AIDS TO BETTER TELEVIEWING 80 ELECTRONIC TECHNICIAN November, 1959 latest sets. for control grid, etc. Fig. 6 illustrates section can be checked by the old iceability features in their a non-conduc- another Westinghouse feature, re- trick of using available a -c filament For example, GE uses test movable B+ lines, indicated by the voltage, we try to locate an easily tive yellow paint to indicate inter- solid line at the side of the 56K re- accessible filament. In this instance, points, tube types, grounds, etc., sistor. This '`jumper" B+ line is not the service data indicates a filament connecting wires, components, wiring board. a novelty either. It serves the techni- test point "J" which is connected to right on their printed 4. cian admirably when trying to locate pin 4 of the 6EA8 tube. See Fig. an aid for the cause of a B -f short since the Applying the 60 cycle, 6.3 volt fila- Westinghouse provides the value B= line of individual branches may ment voltage through a 0.1 of capaci- the technician by labelling the be removed without cutting or un- tor to the grid of the vertical output of components and identifying letters rather than soldering. tube; 6DR7, pin 3, some vertical de- tube pins by code Fig. 5 shows Philco labels voltages on their flection will be apparent on the CRT numbers. For example, tube pins marked printed circuit board and includes if the stage is operating properly. In a 3CS6 tube with K for cathode, G1 large cutouts underneath the board this case, some deflection is noted H for filaments, and the components in the vertical plate circuit (output transformer, yoke, etc.) may be considered good. That is, adequate enough to at least result in vertical deflection, rather Radio Servicing than none. Transistor Transferring the capacitor -filament CAN be Highly Profitable probe to the oscillator grid, pin 7, no deflection is observed. Evidently, there is a defect in the oscillator por- Then, applying the tion of the circuit. The ONLY Complete Transistor Radio Service Lab.. Everything you need for less than =50

TIP THAT FACILITATES Diodes. Rectifier; .. . REMOVAL OF MULTIPLE Check Transistors. TERMINAL COMPONENTS SENCORE TRC4 TRANSISTOR CHECKER Accurately checks all transistors in hearing aids, radios and power transistors in auto radios. Tests for opens, shorts, leakage, current gain. Measures forward -reverse current ratio on all crystal diodes. Measures forward and reverse currents on selenium rectifiers. With set-up chart for accurate checking of each transistor. Size, 5x4t/Zx2r/2". With batteries. DEALER NET 17 TIP THAT PROVIDES TIP THAT DOUBLES FOR TUBE SOCKET FOR SOLDERING Repair .. . REMOVAL. Replace Batfteríes During AID SENCORE PS103 BATTERY ELIMINATOR All -new "Transi-Pak," twin to TRC4 Checker above. Provides variable DC voltage to 24 volts; 1.5 -volt biasing tap ( a"must" for servicing Philco and Sylvania radios). Metered current output, to 100 ma. Handles 200-ma peaks. Two 200-mfd --"f.. Fig. 7-Special soldering iron tips speed electrolytics provide proper filtering and low out- replacement of printed circuit components. put impedance. No hum or feedback problems. - Ideal for alignment using station signal; adjust IF slugs for max. current, also ideal for charging ; nickel -cadmium batteries. Size, 5x4%Zx2t/2" DEALER NET 795 probe to the oscillator plate, pin 6, vertical deflection is still not ob- .Find Defective Stage ín a Minute .. . - - 7l4°=--.. served. The voltage at pin 6 is approxi- SENCORE HG104 HARMONIC GENERATOR - 4: mately correct and, referring to the New signal generator designed primarily for fast "-AIM -44-V , transistor radio circuits. No need schematic and assembly diagram, a signal -tracing of to unsolder all transistors. Provides RF, IF and `'" likely culprit seems to be the 0.1 audio signals simultaneously, drastically cutting coupling capacitor, C520. Replacing service time. Traces from speaker to antenna. Clear is in speaker from all restored the vertical 1000 cycle note signal heard Turn page for other the capacitor good stages. Signal weakens or stops at defective deflection, although the height was stage. Equally as effective for testing TV, hi-fi and rSENCOR-E-1 slightly decreased. Adjustment of the other audio circuits also. Size, 31/zx4%Zxl I". ºQ With batteries. DEALER NET 9 height control remedied that: and a Time Savers "shop job" was completed without removing the chassis. See your Parts In addition to RCA, many other Distributor SENCORE NOW! 2, ILLINOIS manufacturers have included serv- ADDISON

81 ELECTRONIC TECHNICIAN November, 1959 for "under -the -panel" soldering. Motorola, aside from including a "roadmap" on the printed circuit Cartridge -replacements ahead! board, incorporates almost all components on a single board in one of their latest sets. This printed circuit board can be snapped -out of the cabinet in a minimum of time [July, 1959, ET] and the technician can work on the exposed board while continuing to operate the receiver. Sylvania includes numerous test points to aid the technician in troubleshooting. Admiral prints voltages at each tube pin and other key points. The aforementioned manufacturers are just a few of several that design serviceability into their sets. With all

'TERIE;;

Fig. 8-Assortment of helpful tools aids in making proper printed circuit now original equipment on leading STEREO sets repairs.

these service facilities at their finger- The STERIEO single -element ceramic cartridge is now used as tips in the latest TV sets (and radio, original equipment by a number of leading manufacturers of too), the technician's printed circuit packaged stereo systems. The names of these O.E.M.s using service aptitude rests more on his acquiring proper tools and STERIEO and the corresponding part numbers are available from using the correct repair methods than ever your Erie distributor. He can also furnish you with complete before. stocks of this high -quality, high -profit cartridge. Audio engineers specify STERIEO because it delivers the three Tools

most important stereo -qualities . . . balanced channel outputs, Although many tools used to high channel separation, full frequency response. repair hand -wired sets may be simi- But test STERIEO yourself. Compare its quality and compare lady used for printed circuits, the technician its low price ... dual stylus-sapphire/sapphire conversion kit will soon discover that a few specifically designed tools for only $8.95 list; replacement unit, $6.95 list. Then recommend STERIEO to your customers for all their stereo work-replacement and conversion.

Fig. 9-Using adapters, tube base voltage STOCK UP NOW readings can be made from top of a chassis.

For the name ofyour Erie distributor write to: TUBE

40APTER VOLTAGETEST) - ERI E, Eléctroiics. istribütor: QivisiOu POINTS J SOCKET ERIE RÉSIST,OR. COR.PORATION ION CHASSIS)` - Éri,e,;Perínsylvaniá

82 ELECTRONIC TECHNICIAN November, 1959 bristle brush printed circuits only, will be a defi- of various components while solder- useful, is a fairly stiff nite asset. ing. to brush away excess solder. A good firm - The low -wattage (approximately Other helpful tools are shown in substitute for the brush is a 35 watts) solde+ ing iron has proved Fig. 8. They include the following: bristled toothbrush. particularly adaptable to printed cir- Regular long -nose plier and diago- Since printed circuits are usually sili- cuit work. The relatively low power nal cutters; a flush -cutting plies to protected by a coating of wax or alcohol is a iron is suggested because many allow the technician to cut leads con resin, denatured printed circuits can be damaged by when insufficient room is provided; handy fluid to dissolve the protective a good solder- excessive heat. In fact, the technician a thin -blade knife to aid in separat- coating in order to do ink eraser should avoid applying even this low - ing contacts that are flat; a soldering job. A simple pencil or the protec- wattage iron to one area for an ex- ing aid to help maneuver terminals is also helpful to "erase" a lacquer is tended period of time. Frequently a while soldering or unsoldering. Also tive coating. Conversely, higher wattage foil a shorter time is preferable to low wattage for a long time. The higher wattage solder iron or gun is needed for heavier chassis work, removal of boards from supporting lances, and unsoldering getm~v1,! SAVE TIME .-SUBSTITUTE . THE SENCORE WAY The Fastest, Surest Method Known!

' Substitute for Capacitors, Resistors SENCORE H-36-T11E "HANDY 36" 36 most -often -needed resistors and capacitors, for fast, easy. direct substitution in all circuits. Eliminates searching for replacement components for test pur- ro 4 poses. Avoids unnecessary unsoldering and soldering-no more solder mess. Pays for itself the first month in time saved. Flick of a switch instantly selects any one of ... 24 RESISTORS from 10 ohms to 5.6 megohms 10 CAPACITORS from 100 mmfd to .5 mkt 2 ELECTI(OLYTICS, 10 mfd and 40 mfd Fig. 10-Soldering pot employed to remove DEALER NET module or any multi -connection component. Substitute for Electrolytíc Capacitors SENCORE ES102 ELECTRO -SUB Usable from 2 to 450 volts, D.C. Contains 10 eiectrolytics from 4 to 350 mfd. Select heavy tie -points. A 100 watt gun or the correct value with the flick of a switch. features automatic discharge, surge protector circuit. I rcvents larger may be used for this purpose. accidental "healing" of capacitor being bridged. Corn- A variety of solder iron tips are plctely safe-no arc or spark when connecting NET 5 95 available that have screw -in threads. or disconnecting. DEALER for Fuse Resístors During Repair Fig. 7 illustrates some popular tips Substitute for unsoldering components: T- SENCORE FS3 "FUSE -SAFE" shaped, to remove packaged com- CIRCUIT TESTER Instantly tells you whether or not it is safe to replace ponents; hell -shaped, to remove tube fuse resistors, fuses, or circuit breakers. Separate red sockets; and a slot -type, to bend lugs and green scale for each commercially available fuse resistor used in radio and TV. Eliminates guesswork and wasted time. Also handy for wattage checks up to 1100 watts. DEALER NET 8895 Substitute for Bías Batteries During.Repair is avoided by Fig. 11-Component damage BE3 "ALIGN-O-PAK"

See your Parts Distributor Si- .E N' C: O R Now! ADDISON 2, ILLINOIS

83 ELECTRONIC TECHNICIAN November, 1959 l needed to restore the protective coating once the solder job is com- Sylvania pleted. This will prevent moisture and dust from adversely affecting the circuitry. A good substance to use is silicon lacquer or "Krylon" to Audi o -Power recoat the repaired area. Because of this protective coating, test probes with a sharp point should Transistors be used when checking the circuit in order to insure good contact.

Other Aids

In addition to the usual com- plement of tools, the service technician can avail himself of various aids that will make his job easier. One of these aids, a socket adapter, will make tube pin voltages available to the technician in instances where they are not accessible. Be certain that the base of the adapter, shown in Fig. 9, is at least 11/4 inches long Here are two problems in order to accommodate recessed sockets. Also be sure that the socket you won't have to face base is not excessively big, diameter - wise, so that it could tit into a re- when you replace with Sylvania cessed socket. While striving for more compact products, other developments have Problem No. 1: matured together with printed cir- Which type replaces cuits. These developments, assisting which? in the miniaturization of TV and ra- Sylvania has the most complete line available. dios are package components, such And your Sylvania distributor has them in stock. as resistor -capacitor assemblies and The full line listed here equips you to replace modules. A handy piece of equip- the output trans'stors of every major auto -radio ment to unsolder the numerous ter- make. To make your job easier, Sylvania has minals of these assemblies is a solder prepared an interchangeability chart- pot. shown in Fig. 10. The numerous available from your Sylvania Distributor. soldered connections are placed over the solder pot. As the component's Sylvania's Auto -radio Transistor line soldered terminals are melted, the entire 2N155 2N242 2N296 2N350 2N677 component is slowly lifted 2N176 2N250 2N301 2N351 2N677A from its mounting position. To re- 2N235 2N255 2N301A 2N399 2N677B place the component with a new one, 2N235A 2N256 2N307 2N401 2N677C the reverse procedure may be used. 2N235B 2N257 2N307A 2N419 2N678 Working on printed circuit boards 2N236B 2N285A 2N326 2N420 2N678A out of the cabinet can be a tedious and damaging task if not done prop- Problem No. 2: erly. The board should never be The broken mica washer placed flat on a work bench to avoid damaging components, connections or More often than not the mica washer flakes when you copper foil. Instead, an improvised remove the output transistor from the auto radio chassis. jig may be used, as shown in Fig. To save you time and money, Sylvania now packs a 11. This consists of two large blocks tight -fitting mica washer with every transistor. Next of wood, with the top surface cov- time you need an audio power transistor-get it from ered with felt. Some printed boards your Sylvania distributor and ask for Sylvania by name. have screw or eyelet holes near the edges and the boards can he fastened with SYLVANIA ELECTRIC PRODUCTS INC. screws in these instances. Never Semiconductor Division apply excessive pressure on any part S.b idry.fSYLVAN IaT loo Sylvan Road, Woburn, Mass. of the board. GENERAL TELEPHONE 6 ELECTRONICS A low -wattage lamp (approxi-

B4 ELECTRONIC TECHNICIAN November, 1959 mately 25 watt) can be placed un- Shield VARIABLE TWEETER der the board while it is resting on Model S-348, built-in 15 watt tweeter the jig to help the technician detect and variable cross -over network, is the tweeter to be balanced breaks in the circuit. said to allow to suit individual taste, regardless of The neat, orderly layout of com- the woofer being used. Reported to ponents on a printed circuit board have a flat response of 1200 to 15,000 alleviates the problem of wire mazes cps. Cabinet is high -gloss piano finish, voice coil that confront the technician on hand - 33/8 x 11" x 43/4" and the 8 Price $8.88 ea., parts and circuit impedance is ohms. wired sets. Locating or 3 for $25.50. Olson Radio Corp., 260 tracing is made easier through use of S. Forge St., Akron, Ohio. (ELEC- manufacturers' service data and TRONIC TECHNICIAN 11-28) painted circuit aids on the printed boards. Although having some dis- advantages as well as advantages when compared to wired sets, the technician should not have much difficulty adjusting himself to printed circuit service. Adequate practical experience with this much used assembly is fast rendering it "just an- AS other set." Ite,CL TUBES, ¡VIBRATORS Information credit: RCA Service UR ítT E Co. and RCA Victor TV Division, THE SENCORE WAY - Camden, N. J.

Bendix TRANSISTORS A medium power transistor desig- America's Most Popular Tube Tester nated 2N1176, A & B series, is designed more than 25,000 now in use for use in single -ended class B drivers, output amplifiers of portable radios, SENCORE LC3 LEAKAGE CHECKER televisions, and commercial electronic units. Available in 15, 40, and 60 v. Whips those "tough dog" tube troubles ... ratings, with a 300 a d -c maximum collector current rating, its linear cur- Ask any serviceman who owns one ... or try one rent gain characteristic is said to permit for just one day of servicing in your shop. You'll efficient switching and low distortion see for yourself how much time the LC3 can save output. Bendix Radio, Div., Bendix you. Checks for leakage between all elements, by gas, grid emission or foreign 101 Aviation, Towson 4, Md. (ELEC- whether cahscd particles. Also checks leakage on all capacitors rt TRONIC TECHNICIAN 11-29) with voltage applied-including electrolytics. Pro- vides instant filament checks in "Fil-Check- posi- NOW . . . checks 172 tion-no need for a second filament checker.. One tube types-more than Entron TUG -PLUG spare pre -heating socket and new roll chart any other checker of A modern line of connectors for use prevent obsolescence. New charts provided-no this type. sensitivity; 100 megohms, control in master TV antenna systems, permit- charge. Leakage to all other elements; 50.000 ohms. heater to NEW . . replaceable no grid ting plug-in connections requiring cathode. Size, 7x6x31/2". Wt., 3 lbs. For Roll Chart prevents special tools, have been developed in 110-120 volts, 60 cycle AC. DEALER NET 2895 obsolescence. a variety of models. Featured on all master antenna components, the "Tug-

Check Filaments - 1,111.10, EP- 700 of All Check Receiving . 3- and 4-Prong Tubes Vibrators ... and Faster, Picture Easier Tubes }1.n` t ri FC4 FILAMENt CHECKER VB2 "VIBRA-DAPTOR" For fast, easy checking of all tube fila- Plugs into any tube checker; ideal fot ments, without pulling chassis. Neon use with LC3 above. To check 6-v. vibra- 6SN7; for 12-v. . r ; light goes out if tube filament is good. tors, set for 6AX4 or Also acts as continuity and voltage tester. vibrators, set for I2AX4 or 12SN7. Two Neon lamp gloss when 115 v. AC is ap- No. 51 lamps indicate whether vibrator EP- SOO plied by cheater cord, providing a check needs replacing. Instructions on front Steel case. Sim, 11/4x I tthx3' on power to TV set. Size, 31/ex4x1'. 295 panel. G275 With leads. DEALER NET DEALER NET Plug" fittings are available separately See your Parts Distriibutor NOW! for 300 ohm twin lead and RG 59/U cable. The connectors are said to pro- Turn page for other vide matched impedance at connections. Entron, Inc., P.O. Box 287, SEIV CORE SENCORE Bladensburg, Md. (ELECTRONIC e ADDISON 2. ILLINOIS TECHNICIAN 11-32) Time Savers

ELECTRONIC TECHNICIAN November, 1959 85 Arkay TAPE DECK A stereo record -playback tape deck, ;I/ ;;;.ár, said to he ü.. %i;.,.... of professional quality, features mu -metal shielded dual -track combination head at 33/4 and 71/2 ips. Other features include 5 button operation, all metal tape fingers and guards, double shoe brakes, 1/2" capstan, automatic interlock and narrow (1.2 mi- crons wide) gap head. Record and playback f/r 71/2 ips, 30-16,000 cps. $129.95. Arkay International Inc., 88-06 Van Wyck Expressway, Jamica 18, N. Y. (ELECTRONIC TECHNICIAN 11-24)

é /W0414,4,r>, Grommes STEREO PA y.; p

you this extra convenience . .. just as no other speaker manufacturer gives 40 watt monaural or as a two channel amplifier with an you the famous patented Adjust -a - electronic crossover. Cone Suspension and U-shaped pot Styled for tabletop placement in gold and white, in leatherette cases. Grom- mes, Precision Electronic Inc., 9101 King St., Franklin Park, Ill. (ELEC- TRONIC QuAM iA rug MI it& . t TECHNICIAN 11-25)

yowl, covuubilta .2Oo Short Protector

(Continued from page 66) QUA M- N I C H O l S COMPANY 226 E. Marquette Road, Chicago 37, Illinois

nician should check for a short in TV TUNER the t -f tube. The component is employed as a circuit -breaking device HR REPAIR and and is referred to as the "grasshop- 24 per.",> ALIGNMENT SERVICE When an excessive surge of current is drawn through the resistor, VHF or UHF All Makes it will break open and part, thereby - . opening the B+ circuit to the ..r- tuner. VHF Tuners 90 DAY DEALER If the resistor opens, the short WARRANTY $950 F.O.B. NET UHF Tuners should be located ISSUED ON EVANSTON, ILL. and removed be- ALL UHF Converters TUNERS PRICE WE SHIP C.O.D. fore substituting the same value UHF -VHF Combinations 517.95 component. The correct dimensions THE ABOVE SERVICE & PRICES ARE FOR UNMUTILATED UNITS Mlsstng. broken & damaged parts, defective tubes charged extra at LOW Ile prSes. of the resistor's leads and its in- IMPORTANT: SHIP COMPLETE. -INCLUDE ALL BROKEN PARTS. STATE MODEL stalled position should be main- 8 COMPLAINT. PACKAGE WELL TO AVOID TRANSIT DAMAGE. tained as illustrated in Fig. 3. RCA JW Electronics 2404 Bradley, Evanston, Illinois Service Co., Camden, N. J.

86 ELECTRONIC T::CHNICIAN November, 1959 Jerrold ANTENNA GE VARISTORS Using inductive coupling to the a -c Additional medium voltage Thyrite power line and varying the position of varistor assemblies, engineered for 1 to the receptor on the line to a point 10 kv systems, are now available from where the strongest signal is received, a line suited for components from 6 to Ill ma- '` 11 this 6 inch "antenna" utilizes the power 10,000 volts. Thyrite, a non-linear line as a TV antenna. Hidden behind terial, is said to respond quickly to surge voltage decays, minimizing cur- I rent drain and power consumption. Medium voltage units are suited for protection of chokes, reactors, d -c motor fields, and transformers. General Electric Co., Magnetic Material Section, Edmore, Mich. (ELECTRONIC TECH- NICIAN 11-35)

:. . the set at all times, a tuning mechanism n e,córidts . is provided on the device permitting a permanent setting for best reception HORIZONTAL & y` TI(>"ÁL SWEEP. TROUBLES on individual TV receivers. Jerrold Electronics Corp., 15th and Lehigh Ave., Philadelphia 32, Pa. (ELECTRONIC TECHNICIAN 11-17) NEW

RR DIODES WÉNCORJ -, Designed for volume applications, t: these subminiature plastic encapsulated Time Saver selenium diodes, have peak inverse voltage ranges from 50 to 400 volts at 12.5 ma, with maximum case lengths '"Nidown- 0.380 in., and widths ranging from 4

fr i

The missing link in TV service ...

SENCOIRE SS105 SWEEP CIRCUIT TROUBLE SHOOTER IT'S A ... UNIVERSAL HORIZONTAL OSCILLATOR. For direct sub. stitution. No wires to disconnect in most cases. Traces trouble right down to the defective component. Variable output from 0-200 volts, peak -to -peak. 0.340 to 0.480 in. Applications include business machines, arc sup- HORIZONTAL OUTPUT CATHODE CURRENT computers, CHECKER. A proven method that quickly checks the condition of pressors, power supplies; radio, TV, the horizontal output tutu and associated components. Adaptor socket and electric games. Radio prevents breaking 'sires. Easily replaceable Roll Chart gives all necessary hearing aids pin. current and voltage data. Receptor Co., 240 Wythe Ave., Brook- YOKE. A new, simple way to deter- 11, N. Y. TECH- UNIVERSAL DEFLECTION lyn (ELECTRONIC mine yoke failure accurately-v idiom removing yoke from picture tube. NICIAN 11-39) Merely disconnect one yoke lead and substitute. If high voltage (also HORIZ. VERT. bright vertical lice) is restored, TV yoke is defective. OSC. OSC. Tru-Ohm RESISTORS DYNAMIC FLVBAC'( TRANSFORMER CHECKER. Merely VERT. flip switch to "Flyback Check" and meter will indicate condition of HORIZ. deflection. Extremely sensi- Designated the S.AL series, with O.P. O.P. flyback transformer, in degrees of horizontal accurate; even eso'ss up one shorted turn on flyback. axial leads, silicone coating and all STAGE STAGE tive and welded construction, this line of pre- VOLTMETER- For testing bootstrap, screen and other voltages. HORIZ. VERT. Direct -reading voltmeter, 0-1000 volts. cision wire wound resistors is said to FLYBACK O.P. meet rigid military requirements, pro- XFORMER XFORMER UNIVERSAL VERTICAL OSCILLATOR. Checks oscillator, output transformer and yoke. Merely touch lead to component and vide maximum power in minimum HORIZ. VERT. check picture on screen. space and be impervious to moisture. DEFLEC. DEFLEC. Size. 7x6x3 %Z'. Wt. 4 lbs. Standard sizes are one, two, three, five, YOKE YOKE For 110-120 volts, 60 cycle AC. DEALER NET 3950 seven, ten, fifteen and twenty watts. Ranges from 1 to 90k ohms. Tru-Ohm See Your Parts Products, 2800 N. Milwaukee Ave., Distributor S E N C Ó R' E Chicago 18, Ill. (ELECTRONIC TECH- NOW! ADDISON 2, ILLINOIS NICIAN 11-43) 1 87 ELECTRONIC TECHNICIAN November, 1959 RCA announces two tape JAMES B. LANSING names .121.1.$7r Ci cartridge ._ é 1 L_ . 1 player -recorders: reps: Dave Champlin, ...>::..7:;-.. !/. Seat- /' monophonic CP-1 and stereo tle; J. Malcolm Flora, SCP-3. Latter retails for Detroit. Company also pub- NEWS LETTER $350, features automatic lishes 24 -page pocket cata- tape reverse. log of entire line.

HARMAN-KARDON reports rec- ORR INDUSTRIES names ASTATIC is staging a con- Cecil ord sales of $3,800,285 (up Stowe test in search of the oldest manager of the new 15%) and $150,124 income Customer Relations section. (up 130%) for D-104 mike. Closing is Dec. fiscal year Also Charles H. Donahue, ending June 30, 1959. 1st. First prize is a silver D-104, plus standard D-104, Jr., ex -GRAY MFG., as ad 10-C or 10-D. manager. WESTINGHOUSE has developed a stereo demonstration unit CROSBY unveils the Series and record, available to ERA changes rep convention 440 Madison Fielding Stereo dealers to dramatize stereo dates to Feb. 11-13 at Chi- receiver @ $325. Ratings effect to the public. cago's Drake Hotel. are 2 !Iv for 20 db FM quieting, 25 watts/channel music power, phono hum -60 db.

Choose JENSEN MFG. introduces the TR-IOU Tri-Ette 3 Hand Tools ... the Professionals do! -way book- X [ELITE shelf speaker system @ You need the BEST TOOLS to do the BEST JOB . . $89.50 unfinished. Response is rated at 25-15,000 cps, Your Radio, TV and Electronic 30 watts. Parts Distributor has them ! Check the "SEIZER" OXFORD ELECTRIC reports Provides the necessary sales of $4,672,278 and pre- "third hand" in so many tax income of $124,519 for tricky situations! the first 6 months of 1959. Same 1958 period was $3,- 190,537 and $76,792. No. 42H

Clamps on as "STANDARD METHODS OF MEAS- a Heat Sink. UREMENT Holds wires etc. while soldering. FOR AMPLIFIERS" has Holds dial cords when stringing them. been published by IHFM. The Retrieves small items from awkward places. booklet, as well as the ear- Out -reaches and out -holds needle nose pliers. lier one on tuners, is available for $1. GENERAL ELECTRIC announces a 10 -day home trial plan for its VR-22 stereo cartridge. GE also introduces the 7355 audio tube for amplifiers in the 20-30 watt range. It is said Select to fill the gap between from the Complete Line of Quality Tools . . and Handy Kits the 6V6 and 6L6. XCELITE,INcoRPORATED X[ELITE GARRARD lost no time in pub- ORCHARD PARK , NEW YORK w lishing a piece which put the CU report in Canada: Charles W. Pointon, Ltd., Toronto PREFERRED BY THE EXPERTS better perspective. Copies reached dealers almost at the same time CU hit the news stands. for SOUND Dealers need every support they can get, Mr. Manufac- SPEAKERS INSTALLATION turer. Regardless of your application ... P.A.; Inter -corn, outdoor,. REK-O-KUT extended range ... OXFORD is the SPEAKER for your Our registers offering very complete line includes speakers that will meet your of 214,000 shares of common every need . . . quality . . . delivery. Write for our ,new stock @ $3.50, 2/3 catalog today. for company account, 1/3 for Leading distributors carry OXFORD. stockholder account. The company also announced a COMPONENTS, INC. Tropical Holiday contest for 556 West Monroe Street dealers based on points for OXFOR Chicago 6, Illinois OXFORD BRANDS: Supreme Transformers, purchases or sales increases Export: Roburn Agencies, New York Hudson Lamps. Tempo Hi -F1, during the Sept. 1, 1959 to Oaford Speakers t Rear Deck Kits. In Canada: Atlas Radio, Toronto April 30, 1960 period.

88 ELECTRONIC TECHNICIAN November, 1959 FÍó- E E BINDERS FOR YOUR FROM TRIAD ELECTRONIC TECHNICIAN

ELECTRONIC . . to keep your copies for TECHNICIAN ' convenient reference $3.50 each-Postpaid Canada and Foreign-please add 504' for additional mailing costs

ELECTRONIC TECHNICIAN 480 Lexington Ave. New York 17, N. Y. Please ship "ELECTRONIC TECHNICIAN Magazine Binders." I enclose S (please print) CORRECT TELEVISION REPLACEMENT Name GUIDE AND CATALOG TV -6O ' TR. N CORrONATION

Street & No.

City Zone State IMIF6.1,1p IF

_..wro..,... ,e,.,. N.N ... N.. .-...... N .,,.e. ....,. 1

NEW TV -60 CATALOG AND CORRECT -N~ r3;11G r'ry %,. .ir ,. GUIDE FOR 1960 REPLACEMENT 1

; ._ \A,.., nn Behind this cover you'll find 132 pages of com-

pletely revised guaranteed recommendations of tI 299 Stereo Amplifier over 180 new items, including 50 new flybacks, 16 L new yokes, new powers, chokes, width, linearity Here's Why You, Too, Should Recommend II. H. Scott Stereo I Fi Components coils and modification kits, and whole new sections A recent survey showed that electronic technicians recom- of recommerdations never before covered. mended H. H. Scott most often. The reason: H. H. Scott have advanced features and circuit designs components Ask your TRIAD distributor for the new TV -60, or found nowhere else. The highest quality electronics parts Spacious are used to give years of trouble -free operation. write direct to TRIAD. chassis layout simplifies servicing when required. That's why when you, recommend H. II. Scott. you can do so with Remember, old information will cost you time and confidence. H. H. SCOTT money!

H. H. SCOTT INC., 111 Powdermill Road, Dept. ET11, Maynard, Mass. FREE-Rush me your free catalog and hi -fl guide contain- TRIAD TRANSFORMER CORPORATION ing complete technical information on II. II. Scott. components. Name A DIVISION OF LITTON INDUSTRIES Address ® City State 4055 Redwood Ave., Venice, California Export: Telesco International Corp., 36 W. 40th St., N,Y.C. 305 N. Briant St., Huntington, Indiana

89 ELECTRONIC TECHNICIAN November, 1959 the modern approach to HI-FI STEREO servicing

+ -=- 1i Designed v1 -4, -

to Burn - III for Only This miniature lamp has a planned life of NIII \ rlt0 Qrm only a quarter of a minute, but its brief existence is truly spectacular! for in those E:z 15 Seconds! few seconds it pours forth all the light normally emitted during the entire lifetime of a.. an ordinary lamp! r Designed to provide a point of intense light for the tracking apparatus that determines the accuracy of a missile's course in the Here is a Complete Audio Laboratory of six instruments in s first few seconds of flight, this lamp is typical one package! Our engineers have designed the "800" to 1%40'1 lb of many specially engineered lamps Chicago save your time and to simplify the operational procedure of Miniature is called upon to produce. your shop. We know your time is your most valuable inven- Be assured that the Chicago Miniature Lamps tory. Look at the individual services the "800" performs at rif your jobber offers will burn longer than a fraction of the cost for all six instruments! ... $169.95. 15 seconds! The same experienced, precision it's s.or engineering that designed and produced an AUDIO VTV\I this it's an ALrDIO OUTPUT WATT METER special lamp is producing long lasting, it's an Al, DlO-SICNAL standard miniature lamps for your use. GENERATOR Always ask for it's an INTERMODULATION DISTORTION METER Chicago Miniature Lamps! it's a IIAII IONIC DISTORTION NIETER it's a DR and NOISE METER . CHICAGO MINIATURE LAMP WORKS and it's EASY to use 1516 No. Ogden Ave., Chicago 10, III. Miniature Lamps for every requirement offers a complete line of test equipment

!)ynnmic sweep Circuit Analyzer . . for color and black and white T\ . Trouble shoot horizontal and vertical sweep circuits by signal substitution. This same instnnncnt also is a complete compatible Ilpback and yoke tester' S69.95.

Dynamic ACC Circuit Analyzer . . AGC trouble shooting made painless! The "825" solves complex AGC problems fast because it combines ACC lest signal, AGC circuit monitor. AGC pulse indicator, Bias clamp and supply, Continuity tester and \'TVIIt ... $79.95. FROM ONE WHO LEARNED

This enlargement shows a diamond - chip needle sent us by a disappointed "Intermittent Condition Analyzer . , the fast wary to locate intcnttittents and "borderline" user, who learned all diamond emuponcots. Crsec modulated test signal for needles are not TV or RADIO. "1'aectro-Wand" pickup loop O.K. Shows what checks llhes for noise and inn -mittens. "El- happens if a heat bubble forms ectra -Probe" hicates faulty components and loose connections without direct circuit con- when a chip is welded on. Can't nection . . . $89.95. happen with a Duotone Needle that uses only the whole diamond set deep in the metal shank. Induced Waveform Analyzer .. adapts an!, 1'+ "scrape" to check waveforms front the top of the chassis. "Phantom -Probe" snakes every . tithe a test -point without direct connection. Localizes trouble in minutes. Works on TV : Channels 2 thru 13. 3.58-4.5 ntc IF, 21 mc ±,4 Insist on Duotone. 11', 40 mc IF, Audio, Video, and Radio fre------.. .í quencies . . . $169.95. Be sure. Duotone's whole diamond WINSTON ELECTRONICS can't break off. DIVISION Of/ . etronic DUOTONE DIAMOND NEEDLE 1.11.1.51,1111. INC. . "that remembers" N. Keyport, N. 1. 4000 W. 28th STREET MIAMI,S FLORIDA' In Canada: Chas. W. Pointon, Ltd., Toronto

90 ELECTRONIC TECHNICIAN November, 1959 Fire; theft and liability insurance do you carefully inspect for clean- should he carried by every reputable liness? Service Score business to protect its customers and A set returned with dust and itself. The cost of insurance is rela- grime indicates to many customers tively insignificant when compared that the repair was accomplished in (Continued from page 48) to the protection it offers, and an a slovenly manner. Do not allow a on your customer declining while another established service shop cannot af- simple cleaning to reflect ability. Your customer company's service technician repairs ford to be without it. A single major technical dust on his chassis the set quickly in the home. mishap can bankrupt a shop. never sees the until you return it from the shop. 9. Are your service technicians in- 12. Do you ever make necessary service charges main- structed never to discuss competi- repairs beyond that which the 15. Are your tained at an honest, yet profit- tors or their activities with their customer anticipates? able level? customers? Few customers view this practice by individual It's foolish to "build up" a com- in its true perspective. The shop that Service charges to al- petitor's reputation and equally completes costly additional work shops should be standardized low fair business profit. There is foolish to malign him. The latter only without first obtaining the custom- a no sense in being in business unless sounds like "sour grapes." There- er's acceptance may be viewed with it is at a profitable level. Also, basic fore, you can't win when you talk suspicion. Even though legitimate, charges should be standardized to about competitors. the repair bill may be challenged. avoid conflicting estimates of two 10. Is an adequate stock of replace- 13. Do you keep complete service ment parts maintained? records of all customers? technicians from the same shop over a short period of time. And don't It costs a relatively small amount Accurate record keeping may for get-neighbors compare prices. of money to stock an adequate sup- seem to be both a bother and an ex- 16. Are service calls answered in the ply of most parts. This enables the pense. However, keeping records up- order of call -in within the limita- technician to offer faster service. to-date will enable a shop to easily tions of route? Rushing to the distributor for every check a previous service job for war- each technician's You'd surprised many little part consumes a considerable ranty verification, and aid when be how neighbors know each other. A cus- portion of the technician's produc- compiling a mailing list for seasonal will be insulted if he discov- tive time. specials, checkup reminders, etc. tomer ers that he was shunted aside for an - 11. Do you have complete insurance 14. Before a unit brought to the coverage? shop is returned to the customer, (Continued on following page)

Typical Indoor Antenna Gripe Only Motorola I'm afraid .to let go -or THE PICTURE FADES-!! . ' Torture Tests

.. ,i , r Twice r to _ITryr But Not With - Maximum ,yr h/annejg . _. Ratings ..;11'2"'" Indoor Antenna Unique electronic testing device "works over" Extends to 42" 100% e Retracts to 0" every Golden "M" Tube, assures reliability i SINGLE DIAL adjusts arms and signal MOTOVAC, the Motorola -created elec- Result? The most reliable tubes you can tronic brain. torture-tests Golden "M"" buy! The kind that give you far lower Hands NEVER touch Antenna arms Tubes to specifications that are the highest "in -use" and "shelf -defective" rates than in the entertainment -type tube industry. ever before. Distributor . Or write for See your .. TNIDEMIINR Or MOTONOL,INC. Literature and Specification Sheets MARJO TECHNICAL PRODUCTS 1 COMPANY M; _ 1146 E. Henry Street. Linden. N. J. MOTOROLAFranklin Park, Illinois Parts and Accessories Division,

91 ELECTRONIC TECHNICIAN November, 1959 (Continued from previous page) after -\\*,1/4, other customer. Wouldn't you? , --- 17. Are your service calls routed in radio -tv an efficient manner? 60eyears Rushing to one customer's home without referring to other calls to ,`..> serviceman's be made will invariably result in - . "be e n abnormal travel time. All calls stfr d"! should be carefuly routed in an effort to keep them within the closest vicinity. Special attention to dis- S patching technicians will avoid those extra miles and non-productive time. 18. Do you run regular checks on KESTER RESIN -FIVE" FLUX -CORE SOL- equipment? DER enjoys almost 100% acceptance Equipment by the radio-television-electrónics should be maintained service industry. Servicemen like in top form to enable technicians its fast action and easy application to service sets properly. The wrong .. its non -corrosive, non-conduc- time to discover a tive defective piece of activated flux does a perfect is job every time. equipment when it is needed to make a certain repair. 19. Do you purchase components Send for detailed informa- from a legitimate tion on parts distribu- Kester "Resin -Five" Flux - tor? Core Solder. Those surplus bargains may look great at first, but in KESTER SOLDER CO. the long run, sub -standard will 4264 Wrightwood Ave., Chicago 39. Illinois parts increase call- Newark 3, N.I. Anaheim, Call Brantford, Canada backs, and labor costs will more than offset the insignificant savings. 20. Do you have OVER 60 YEARS' periodic advertising EXPERIENCE IN SOLDER AND FLUX MANUFACTURING campaigns? Whether it be postal cards, cal- endars, flyers or radio, advertising will prevent your business from stagnating. It will call attention to your shop and remind your custom- BINDERS ers that their set is not "perfect." for People often put off having certain your work done, and . - is ' advertising a per- jj ; .:::: CÑN~'N . fect' ,YK`t ,,;2( ,. . 'IVt CIRCUIT DIGESTS . . method of gently reminding them Digests 1O3/4" X that their sets need service. Al- Cirtu' `I Tit i 141/4" ways record the results of a particu- ':''.f v , are now available to lar campaign to discover which one appealed to the ELECTRONIC TECHNICIAN consumer. subscribers These sturdy spring -type (no holes to punch) binders are bound in dark red, hard bookcover material they hold ... 24 monthly issues of CIRCUIT DIGESTS plus other reference literature. ... and are embossed in gold on the front and the back other binding. An- ELECTRONIC TECHNICIAN service-to help you preserve and get more convenient use of your valuable CIRCUIT DIGESTS! $2.95 each-Postpaid (for Canada & Foreign-add 50¢ postage)

ELECTRONIC TECHNICIAN 48G Lexington Ave., New York 17, N. Y. Please ship "CIRCUIT DIGEST Binders." I enclose $ Name

Street Sr No.

City Zone .... State

92 ELECTRONIC TECHNICIAN November, 1959 Todd 4-loüeat Items iav Ito EWtox i/9 Fig') LA Association News THE CITIZENS BROADCASTER California SRTT, Orange County, elected new officers as follows: Pres., Frank Rice; wo V.P.. Gordon Mauer: Sec'y, Frank Montelli; Treas., Clifford Gebbers. Van Nuys chapter recently held a low cost, troubleshooting clinic with Sencore Rep smartly styled, Sales Manager Ed Flaxman and . Mark Markman. These Sencore practical and sturdy NO OPERATOR'S LICENSE REQUIRED "Time Saving Clinics" are available FCC FORM 50S FOR STATION LICENSE free of charge to service technician 2 -way 3 -channel SUPPLIED . NC TE'.TS. NO EXAMINATIONS groups through arrangements with . distributors or the instrument Radio Station local . ,. - : company's representatives. complete * : , - _ TSDA, San Mateo, says tax evasion 1.4:"'P41 charges have been leveled at do-it- ' - ` o_,s operators' al- -wpw. yourself tube tester + _..-.,.. legedly evading tax and license pay- gz=í t ments in San Mateo County.

Florida WITH MICROPHONE AND CRYSTALS FOR ONE CHANNEL TESA, St. Lucie County, elected James W. Sowinsky, Pres.: Leonard CONTACT A. Appel, Sec'y; John Forget, V.P., FOR COMPLETE INFORMATION, and William Montaltos, Treas. YOUR GLOBE REPRESENTATIVE OR WRITE TO TSDA, St. Petersburg, elected Bud Fox as Pres. of their recently organ- ele('ti-o»i(S ized group. A DIVISION OF TE.(TRON ELECTRONICS, INC. t t 4l NO. 41 SOUTH 34T4, COUNCIL BLUFFS;, IOWA Illinois TESA. Chicago, in its association publication. prints a list of Chicago Wage Building Trades scales-fur- Now . . . nished by the Builders Association of Chicago, showing hourly wage Planet offers you scales, plus fringe benefit equivalents as follows: Electricians $4.10, Paint- exact replacement ers $3.85, Carpenters $3.95 and Plumbers $4.19. Twist Prong Can in both NATESA answers recent industry Capacitors manufacturers who contend that their Solder Lug and "Stop Crying, Start Selective Buy- ing" slogan is ineffective. "We doubt Printed Board the statement that selective buying has not affected sales on a regional Construction basis," says NATESA. "Recorded facts prove otherwise." NATESA continues, "We think the statement, Planet Twist Prong Can Electrolytics `No manufacturer, by having a fac- are the choice of many top TV and tory service operation, takes away electronic equipment makers. These service from the independent' is rank films use Planet "TP's" because oí uniformn quality, workmanlike con- . . . does absurdity." If the factory struction and freedom from field the service in his operation, how can troubles. Now Planet is making these an independent do it?" Complete list same values and sizes available to of officers recently elected by you, the men who service this equip- NATESA are: Pres., Mac Metoyer; ment. Ask for Planet "TP's" by name at your parts distributor. Sec'y. Gen'l., Benny Benoit; Treas., Nelson Burns; Eastern V.P., Irvin We will send you our catalog listing Toner; East Central V.P., Cordell upon request. Britt; West Central V.P., W. E. Johnson: Western V.P., Winston Haines: Eastern Sec'y, George Carl- son; East Central Sec'y, Gerald PLANET SALES CORPORATION BLOOMFIELD, NEW JERSEY (Continued on page 101)

93 ELECTRONIC TECHNICIAN November, 19S9 ATLAS PAGING SPEAKER STYLED FOR MODERN DÉCORS Video Defects The New Atlas DU.12 Perfect for the Most Discriminating Applications. For the first time here's a loudspeaker that doesn't look like one. Modeled along the sleek, straight lines of a modern (Continued from page 41) lighting fixture, and finished in brushed satin aluminum, the Atlas 0U-12 is styled to harmonize and enhance the most ultra of modern decors. Acoustically, the Atlas DU -12 offers high intelligibility, efficiency and directivity - features that distortions in these circuit mark as a line branches it quality loudspeaker. The frequency response of the DU -12 is "tailored" to reproduce speech with clean, crisp articulation. Its horn type construction and universal mounting are cumulative. bracket provide complete directional control, confining the sound coverage to the required service Suitable values areas. And, there's no for Rs and Cl can wiring exposed to mar its appearance because all connections and line matching transformer are completely hidden behind the mounting canopy. Canopy is equipped with be used to practically cancel tilt dis- adapter strap for mounting on any flat surface or for use on standard electrical outlet box. In tortion from RIC1. In other words, commercial installations where both décor and true acoustical quality are important, the Atlas DU -12 is the only answer. Investigate the profit opportunities for yourself. Write for information choice appropriate values for R; and on the complete line of Atlas P.A. speakers, mike stands and accessories. C3 will provide a low -frequency boost Décor -Projector DU -12 to offset low -frequency loss in RIC1. List $35.00 At the same time, a Net $21.00 low -frequency phase correction results. Both frequency and phase distortion occur in a coupling circuit with an inadequate time constant. However, one distor-

eL1C QV ALS I VsTERMIN, r~;/111 é RESO-'s Write for complete Catalog ,-

Dept. ET- 1449 39th Street, Brooklyn 18, N. Y. In ATLAS Sound Corp. Canada: Atlas Radio Corp., Ltd., Toronto, Ont. Fig. 9-Overshoot causes picture edges to be outlined by either white or dark areas.

tion can he used to cancel another. Low -frequency boost circuits are \1., attractive when good response is a. r ' desired at low frequencies, because excessively large values of grid capacitors can thereby be avoided. Large value coupling capacitors tend to leak more than smaller capacitors. Large values of grid -leak resistance can cause grid -current difficulties.

Phase

000, A video amplifier has a phase characteristic, as well as a frequency characteristic. In other words, low and high frequencies may pass through a video amplifier at the same time in- terval, or, low frequencies may flow faster or slower through the circuit configuration. ....For your good! Nothing spells cus- Phase distortion is more serious 111FAV IIE IED tomer satisfaction as much as per- than frequency distortion. It causes formance-and that's exactly what a greater picture degradation. However, Taco antenna provides. For more years we do not normally check for phase TV than any other antenna manufacturer, Taco has provided the TV technician distortion directly. This would be too with the antennas best suited for all difficult, and require elaborate equip- ANTENNAS reception requirements. Try one on that ment. next installation and see for yourself ... We can get a very practical check WRITE FOR COMPLETE TACO TV -FM -AMATEUR CATALOG. of phase distortion when a square - TECHNICAL APPLIANCE CORPORATION, Sherburne, N. Y. wave test ís made. If a square wave

94 ELECTRONIC TECHNICIAN November, 1959 is reproduced satisfactorily, the phase '=Model' ''6T2T $49.95 net characteristic of the amplifier is good. NOW THERE ARE As a general rule, it is assumed that a video amplifier will have a satisfac- JACKSON tory phase characteristic if its frequency response is flat. This is not en- Lift it.. DYNAMIC® TUBE tirely true, since much depends upon the cut-off characteristic of the ampli- TESTERS

- DYNAMIC J ®®¡' OUTPUT e .

9 t,;ll 1íti C° 658 tr Checks receiving tubes, voltage regulators, eye causes a tubes. Shows heater continuity without warm- Fig. 10-Tilt in video amplifier impression. up. Reads heater current. Provides both shorts shading with a picture smear you can feel test and grid leakage test. Has 23] heater voltage combinations. An outstanding profes- fier. If the peaking coils (and 4.5 me sional tube tester. $189.95 the extra quality trap) have values which cause a sharp high -frequency cutoff, the amplifier NEW in an EPL t7 will ring in spite of having a flat . LOW frequency response. + DEC POWER SUPPLY! COST Hence, a video sweep -frequency followed up with a a e DYNAMIC test should be Powers transistor circuits, square -wave test. It may be found 12/6 volt hybrid/tube . -4 -f' 598 that better square -wave reproduc- auto, marine radios tion can he obtained by compromising EPL power supplies are heavier be- Provides convenient lever switching and time - the frequency response to some proved Jackson Dynamic test principle. Has cause they're built with top quality, variable plate voltage and load controls. Shorts extent. heavy duty components to provide test has variable sensitivity to 2 megohms. The end result desired is good unequalled durability and perform- Convenient roll chart and grouped tube socket quality picture reproduction. This will ance. Ample regulation for operat- sub -assembly- $89.95 ing solenoid tuning controls in auto he obtained if the amplifier can re- radios. Patented conduction cooling produce both low -frequency and gives greater safety margin, longer WORLD high -frequency square waves with rectifier life and higher current car- negligible distortion. rying capacity. FAMOUS all out -performs all others in its DYNAMIC price class 648R lowest ripple costs less per output G -C KNOBS ''r - knobs; reserve power to handle any A line of 97 replacement TV service job Features super -rapid sequence switching. The "on -off," "fine tuning," volume" and Proof - set-up time is less than the warm-up time of claimed to pro- backed by Certified Twenty-three separate heater volt- "channel selection," are of -Performance chart the tube. vide full exact replacement coverage ages. Line voltage control indicates actual line longer life voltage. Famous for dependability the world for eight leading brands of TV re - 2 ranges: 0-8 and 0-16 volts continu- over. $129.95 ously variable. Less than 0.5 % ripple up to 5 amperes. 2% ripple of 10 amperes. 10 amps. at 12 v. continuous duty. 20 amperes intermittent. POWER CHART ACCESSORY FREE BULLETIN D612T See the Difference at Your Jobber Here's a new addition! The Jackson Power Roll Chart-available in all three tube testers for those who require the extra. Roll the chart from IN EN MI the in less than 25 seconds one end to other ELECTRO with the touch of a finger. $20.00 net lectro PRODUCTS

SEE YOUR DISTRIBUTOR OR WRITE FOR LITERATURE. 4 /' 1 4501-1 Ravenswood, Chicago 40 o. > THE JACKSON. Canada: Atlas Radio ltd., Toronto ELECTRICAL BCICSOII ceivers. Each knob is skin -packed and J INSTRUMENT. carded for both protection of the mer- Nome

' COMPANY full chandise and easier identification; Address 1 16;18 SOUTH,PATTERSON- BLVD. cross reference information is provided. DAYTON 2, 01110 G -C Electronics Co., 400 S. Wyman St., 1 City Zone Stote 1 In Canada: The Canadian Marconi Company Rockford, Ill. (ELECTRONIC TECH- NICIAN 11-16) I. EI ELECTRONIC TECHNICIAN November, 1959 Microphone Loading TABLE II RATED AMPLIFIER INPUT IMPEDANCE 50 -ohm Technicians, usually quite familiar Input impedance 150 -ohm input impedance 250 -ohm input impedance with the applications of high -imped- effect effect on effect on Mike effect effect on effect on effect effect on effect on ance on 100 microphones, occasionally run 10,000 on 100 10,000 on 100 10,000 Z level response amuck when working with low -im- response level response response level response response - pedance broadcast mikes. This slight 50 none none none 5 db none none 7 db none none confusion is only natural, since most loss loss consumer audio products contain 150 5 db no no high -impedance inputs, rather none none none 2 db none none than gain notice- notice - the more expensive low -impedance able able loss loss loss ones, and the technician is therefore 250 7 more familiar with the former. An in- db 2 db no nonone none notice-ble notice-oble notice-g°In none creased demand for anotice- more sophisti- loss loss gain able able cated equipment, however, has re- loss loss sulted in the "professionalization" of some hi -grade preamps. This upgrad- connected to an open grid, which is ing includes low -impedance mikes virtually an open circuit. Therefore, TABLE I and inputs, enabling the user to run the microphone is ostensibly un- long mike cables without undue Microphone Cable Length (feet) loss loaded. However, a mike that does of high frequencies. not have a Impedance Causing 1 db Loss connected load will still (ohms) at 10 kc have an output voltage across its ter- Applications minals. This is the unloaded or open - In a 50 920 typical broadcast console the circuited voltage output and is the low -impedance microphone is con- voltage that manufacturers refer to nected to an input 150 310 transformer that when specifying output level and fre- raises the microphone impedance quency response. (normally 50 ohm, 150 ohm, or 250 In 250 190 some applications, broadcast mi- ohm) to approximately 50,000 ohms. crophones are connected to imped- The secondary of the transformer is ances equal to the impedance of the

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for instance . . . for power tools to your liking

Unique U Bolts instead of two screws make for quick, simple, antenna installation. Spring tension on steel SAY wEN mast retainers holds antenna mast while Special U Bolts are inserted and tightened. Saves installer time - permits greater safety. Same features are included in Snap-ln Wall Brackets.

Products made better by design 9.95 - with the installer in mind MAKE IT EASY FOR YOURSELF SN-50 CHIMNEY MOUNT SOLDER GUN KIT . . Better for your Customers (Two To A Set) OF A THOUSAND USES Over a million sold! Heats up in just 2% seconds. Long -reach, long -life tips, Insist on mountings and accessories made by automatic spotlight, sturdy, perfectly balanced plastic housing. 6 models- METAL PRODUCTS CO., INC. feather-light 100 watt to 250 watt heavy South River, New Jersey duty.

PIONEER OTHER GUNS AND KITS, MANUFACTURER AND OUTSTANDING PRODUCER OF THE FINEST LINE OF ANTENNA MOUNTING ACCESSORIES $5.95 to $15.95 SAY WEN FOR DRILLS, SABRE SAWS, SANDERS CANADA: LEN FINKLER A CO., TORONTO 5810 NORTHWEST HIGHWAY, CHICAGO 31

96 ELECTRONIC TECHNICIAN November, 1959 microphone. When this occurs, the STOP that microphone is loaded and its performance differs from that of the open MORE interference! circuit condition. Consequently, the OF EVERYTHING microphone performance will not comply with its listed specifications. YOU WANT IN A Examples of loaded conditions are: Low-level mixing at the input of a V -O -M broadcast console; the input imped- New Mirrored Scale Plate ance is nearly that of the microphone, Wider Frequency Response AC Ranges resulting in a load on the mike; tran- DC Polarity Reversing Switch sistor amplifiers, usually designed New Extended AC and DC Ranges with an impedance match between 99 microphone and input stage. Loading Perhaps the simplest condition of ELIMINATE OR REDUCE loading is one where both the micro- TV AND FM INTERFERENCE phone impedance and load impedance the same at all frequencies. This ...... are condition occurs when an essentially Tunable constant impedance microphone is connected to a purely resistive load. MOSLEY The frequency response undergoes no change when connected in this manner, although a loss of output is ex-

Wave 4 hibited. The unchanging frequency .u. Ira oc.

97 ELECTRONIC TECHNICIAN November, 1959 in microphone performance. Special loading problems, such as the result save money of using electrical filters, have not been considered in Table II, speed repairs, earn more with since each solution must be solved separately and is usually associated with broad- knight-kit casting station equipment only. Referring to the previously out- service instruments lined information, in most applica- - tions broadcast microphones are used 0,1114 open -circuited and a loading effect does not exist. With High -Gain care, cable capacity loading can be minimized by 5" General - considering the Purpose specific microphone and desired fidelity. Bi-directional Scope Kit and cardioid mikes should he used i - open -circuited, unless bass attenua- only $4495 tion is unimportant. In general, $2 Down though, loading broadcast microphones will not severely degrade Ideal for TV - radio servicing. sound quality. llas 3 times the vertical sensitivity of any scope Information credit: Electro kit in its price range. Top -value features: Re- -Voice, sponse. ± 3 dh from 3 cps to 1.5 mc; built-in Inc., Buchanan, Mich. Phantaatron sweep generator (high linearity); retrace blanking; internal, regulated 1 -volt calibrating source; DC coupled picture centering controls. Easiest construction with printed circuit board and laced wiring. Exclusive money - back guarantee. Shpg. wt., 27 lbs. Y 146. $2.00 Down. ONLY $44.95 WANTED Y 148. III' Demod. Probe Kit 3 95 Y 147. Low . Cap. . . . . Probe Kit . 3 95 r Fugitive An exclusive - _ High -Impedance from Justice service Electronic by VTVM Kit Amperex only $2575 distributors: $2 Down Top buy; easiest to build -entire chassis is printed circuit hoard. Features: big 4W meter; VALVO' 204) µa movement; 1% film -type precision resistors; balanced -bridge push-pull circuit. Reads RECEIVING TUBES, AC peak -to-peak (0-4-14-40-140-400-1400-4000 v.); AC rms and DC (0-1.5-5.15-50.150-500- for 1500 replacement in v.); resistance (1 -1000 -10K -100K: 1-10- 100-1000 mega); db scale, -10 to +5. Exclusive European radios money -hack guarantee. Shpg. wt., 7 lbs. Y 125. $2.00 Down. ONLY . $25.75 Y 126. Hi -Voltage Probe Kit 4 75 Many European radios and Y 127. Hi-Freq. Probe Kit hi-fi 3 75 components now popular in this country utilize the European -made ALLIED CATALOG VALVO tubes, which have thus far had no American distribution: As See our 1960 Buying Guide for the a special complete selection of KNIGHT -KITS service to the trade, VALVO -plus the world's largest stocks of tubes are now being stocked by all electronic parts and equipment for service work. Send for FREE copy. franchised Amperex distributors. Re- placement of the original tubes with completely identical types will assure E ALLIED RADIO JOSEPH KRETSINGER TICE. optimum results in the repair and ALLIED RADIO, Dept. 25-L9 also known as Jack Carson Adams, servicing of these European sets. 100 N. Western Ave., Chicago 80, III. Joseph Kretsinger. Joseph R. Thorn- Ship the following ($ ton, is wanted by the enclosed): Federal Bureau ,offiric-siv.aawa 0Y146. 0 Y 148. of Investigation for violation of parole. ////IC.11 0 Y 147. \\il:.\\ERf1fflAl 0Y125. \7r 0 Y 126. 0 127. //1/_S' Send FREE 1960 ALLIED Catalog. Description Tice was horn April 12. 1927, Name at ask Amperex Dixon, Illinois. He is six feet tall, 181 for the Address name and address to 187 pounds, medium build, brown of your *distributor City Zone State hair, brown eyes, fair complexion. The Amperex Electronic top of his right index finger has been Corp. 230 Duffy Avanuo HloYavllle, L.I., N.Y. 98 ELECT..1ONIC TECHNICIAN November, 1959 BEST BUYS IN BEST BUYS IN CUSTOM TEST INSTRUMENTS STE1 HI -Fi... E/CO's

Praised by the experts Lifetime service guarantee rca . Ruggedized mechanical design for utmost accuracy & stability Praised by the experts Only the latest, finest quality parts used Lifetime service guarantee Modern "low silhouette' horizontal chassis lazy console installation

oe ..e;

_ 4.

Joseph Kretsinger Tice - \ - Color & Monochrome DC to 5 MC lab' & TV 5" Oscilloscope #460 amputated. The little and ring fingers FM Tuner HFT90 Wired $85.95 Kit $39-95' Wired $129.50 Kit $79.95 Cover $3.95. 'less cover, FET included. his right hand are partially stiff. "One of the best buys." - AUDIOCRAFT Features DC amplifers; flat from DC to 4.5 on AM Tuner HF394 Wired 165.95 Kit $39.95 mc, usable to 1 m He has a cut -scar on the inner left Includes cover L FET. - wrist and a bullet scar on the calf of "One of the best...ideal for those wishing to add ? AM to their systems." -HI-FI SYSTEMS his left leg. He has worked as a radio ' 411--* FM(AM Tuner HFT 92 W'red $34.95 - and TV service technician, electrician, Kit $59.95 Includes cover & FET . . ea/4) merchant seaman, laborer and IBM operator. This individual was on parole at r . Seattle, Washington, after conviction & Marker #368 TV -FM Sweep Generator of a Wired $119.95 Kit $69.95 for Interstate Transportation Preamplifier HF61 Entirely electronic sweep circuit with ac- stolen motor vehicle. In February, Stereo Dual Amplifier - curately biased increiuctor for excellent Wired $109 95 Kit .$69.95 1954, he violated parole by leaving "Outstanding quality, extremely versatile." linearity. flat RF output. Extremely Seattle after issuing worthless checks - ELECTRONICS WORLD LAB TESTED for cash and a rental of a 1953 Chevrolet. His whereabouts have Dynamic Conductace Tube not been known since February, t - & Transistor 1954, and the rented automobile Tester $'666 - - - - = oK ,. Wired á1C9.95 `` i Kit $69.95 V Stereo Dual Preamplifier RF85 Tests all receiving = . tubes(p)eture p At the request of the F.B.I., Wired $64.95 lit $39.95 tubes with \17.71.7 "Outstanding buy."-TME AMERICAN RECORD GUIDE and as a Public Service, Elec- adapter), n -p -n and Stereo Dual Power Amps p -n -p transistors. tronic Technician Magazine is 21 Witt Model NM. 10 -Watt Model Hill bringing this to the attention W,reo $74.95 Lit $43.95 Mired $114.95 Kit $74.95 i of its readers. Peak-to -Peak 3 -Way High Fidelity VTVM #232 & Speaker System Uni-Probe (pat- pend.) - SemiiKits HFS-3 & HFS-5 not been recovered. He has lived Wired $49.95 has Complete with faztory- Kit $29.95 in Buffalo, New York: New Orleans, constructed enclosire Eas) to assemble - no Uni-Probe - exclusive Louisiana; Chicago, Illinois, and the ailing cr woodworking with 'EICO -'.only 1 HFS3 unfinished birch, Pacific Northwest. He has talked of $72.50; walnut, mahogany probe performs all or teak, $e0.5o functions: half-turn,of going to Canada to live. Tice has HFS5 unfinished,birch, probe tip selects DC $47.50; walnut, mahogany or been convicted of impersonating a -' teak, $59.53. or AC -Ohms. Othe- speaker system semi - Federal officer, forgery and inter- kits from $39.95.

In stock at over 1500 distributors In the U.S. and Canada state transportation of stolen auto- In stock at over1500 distrtbutbrs in the U. S. and Canada /IMPORTANT NOTE: All EICO kits built mobiles. ccording to ou instructions, and all LICE, 33-00 Northern Blvd., L.I.C. 1, N. Y ET -11 ICO factory -assembled equipment, con- Any person having information Show me how to save 50% on to3 quality: HrFi and specifica- rm to the high standards which might assist in locating this fu- Test Instruments Ham Gear. Send free ns EICO and published in literature catalog and lame of neighborhood EICO supplier. ertisements. All EICO factory -assembled gitive is requested to immediately Send free STEREO Ni -Fi Guide. ipment is completely and meticulously hand - d throughout - no printed Circuitry; each notify the Special Agent in Charge of Name ryassembled uni: is 10C i final -tested Office. The telephone ghout for each feature and function - no the nearest FBI Address " Cr "partial" checking. In EICO's final the first page of appears on . echniques, nothing is left to chance number City Zone . Slate Add 5% in the West Y. the local telephone directory. - EICO, 33-00 Northern Blvd., LTC. 1, N.

99 ELECTRCNIC TECH VICIAN November, 1959 MASTER RECEIVING -PICTURE TUBE SUBSTITUTION GUIDEBOOK by H. A. Middleton The Ow..«44-row/t fabulously popular Receiving Tube Substitu- tion Guidebook' and all four supplements New Books reset. has been expanded and brought up to date in one master book. The original Tube tape recorder P. A. system Guidebooks Substitution Book marked with an asterisk (5) may be ob- were considered the most handy and portable TV important work books for set hand tools - tained prepaid from Electronic Marketers, and technicians, engineers Book hobbyists-the new Master book.is even more FROM YOUR Sales Division of Electronic Technician valuable. In one Master Book, CAR, Boat or Plane! the that is easy to use. entire range of all radio and television receiving and picture tubes and their with at your fingertips. substitutions are SILICON ZENER DIODE 5100 HANDBOOK. Pub- Radio and Television Receiving Tube and lished by Motorola, Inc., 5050 E. Mc- 825 Picture Tube substitutions are listed in AIR numerical sequence with accompanying Dowell Rd., Phoenix, Ariz. 126 wiring pages, instructions showing the original and substitute soft cover. $1.00. tube socket illustrations. features European -American and Amerfcan- This European cross index listing more INVERTERS comprehensive handbook cover- American to than 325 ing European substitutions; more than basic theory, design characteristics 320 European to and American tube substitution. e applications of zener diodes alone special section on ruggedized tubes. is a tribute to the This book is an indispensable a advanced stage that tool to any person % I1 who i:.: semiconductor theory has reached. This designs, assembles or repairs radio. TV or . electronic equipment. This book pays for itself relatively new and versatile component almost immediately. A major portion printing has of the first is sufficient in itself to command a text been sold out, you must act now to reserve your copy. Satisfaction guaranteed. devoted exclusively to it. The x 11", for changing your storage manual #244-812 only $7.45. covers zener For a short battery current to diode use in regulated time, the original RECEIVING power TUBE SUBSTITUTION GUIDE, its three A.C. HOUSEHOLD ELECTRICITY supplies, surge protection, a -c, PLEMENTS SUP- d plus a fourth SUPPLEMENT (ready Anywhere ... in your own cart -c amplifiers, temperature compensa- soon) will be available. tion and other HOW TO INSTALL AND SERVICE applications. Designers (2nd AUTO RADIOS edition) by Jack Darr. The 2nd edition will be surprised and rather this extremely of O PERATES pleased by informative and Practical book a separate chapter covering design brines auto rrrlin installation and servicing right PORTABLE TV SET up to date. All the new tricks of the trade are directly from your considerations, using a special be found to corT zener here. The techniques applicable to the diode slide rule calculator most modern auto radios-.signal-seeking (available hybrid auto tuners, separately from radios. transistor auto radios, con- Motorola Semicon- version G from to 12 volt operation. and many ductor Distributors for $1.00). The more new things are explained in great detail. The author, an handbook contains expert in this field runs a very plentiful drawings successful auto radio and mobile OPERATES and and radio installation schematics. service shop. This 2nd edition contains prac- RADIOS tical, proven solutions r and is really a money RECORD PLAYERS making "tool" íf159, $3.25. MIXMASTERS, ETC. DIGITAL COMPUTER PRIMER. By E. directly from your M. co,! McCormick. Published by McGraw- RIDER Hill Publishing Co. 214 pages, hard MAKE YOUR CAR, BOAT OR PLANE cover. S7.50. ANNOUNCES NEW "A ROLLING OFFICE!" RECEIVING -PICTURE TUBE Any technician wondering about the SUBSTITUTION OPERATES how TAPE and why of those complex devices. RECORDERS digital GUIDEBOOK DICTATING computers, will find this book of ...the answer to all tune substitution problems MACHINES value. Awe-inspiring PUBLIC ADDRESS computer theory REPAIRING PORTABLE AND CLOCK is Lien RADIOS by SYSTEMS translated into a completely palata- Criases and David Cnrasin. You can learn ELECTRIC SHAVERS ble state by this all about portable and clock directly from your relatively non -mathe- cuitry, radios-their cir- coif matical their repair, in this modern book. Begin- approach to the subject. Fol- ning with typical portable radio circuits, emphasis lowing an introductory discussion of is placed on filament circuitry and how major problems of current dispersion are terminology, sistor handled. Tran- characteristics, etc.. the circuitry is covered. Stress is placed on author portable radio power : upPlies for concentrates on the EDPM type and battery circuits of general-purpose battery and AC-DC circuits. Numerous bat- - computer, in a con- tery testing techniques explained. .í-,-.,,`." replacement Covers repair. cise, easily understood manner. A and alignment plus a detailed dis- mounted out chapter describing the cussion of probable mechanical trouble, replace- 0,41 of sight under logical organiza- ment procedures and short-cuts. Tips on e the extending e dash or in tion of Tick -Tack -Toe machines and life of the set. are discussed. Clock radios, hunk their circuitry, a wide variety of cluck other games occasionally exhibited at hoc to movements. comportment adjust them and locate defects =224. $2.75. IRE shows, will provide an enlighten- REPAIRING ing, TELEVISION RECEIVERS, by Cyras yet educational, interlude for the (Rrek.stein. The most modern completely practical book, written by an expert with ATRJUNIVERSAL reader. in lung experience television receiver repair. Devoted to troubleshooting and repair techniques which yet are modern. *VIDEO SPEED down-to-earth. rovers tit. use of simple as INVERTERS SERVICING. Volume 3. By well as elaborate test equipment -191, Only 54.40. Especially designed to change 6 or 12 volt Samuel L. Marshall. Published by ADVANCED TV SERVICING and TECHNIQUES, by %bar. D.C. to 110 volt A.C. 60 cycles. Howard W. Sams & Co., Inc. 160 Srbildkra at. :\ complete advanced Tt' servicing course, developed by the Radio for... pages, soft cover. S2.95. Television -Electronics - Manufacturers Association. Shows hose EXECUTIVES POLICEMEN to use every conceivable type of test how to service equipment, SALESMEN REPORTERS This third volume manual follows ever, part of a TV receiver. Ex- plains latest techniques. Soft OUTDOOR MEN FIREMEN the format rover. Rt_" x II". established by its predeces- MAIN TEXT, 192 pp., inns. _161. $3.60. PUBLIC OFFICIALS sors; a LABORATORY compilation of trouble symp- WORKBOOK, 32 pp. =161-2. 5.95. MODELS 6U-RHG (6 volts) 125 to 150 warts. Shipping toms and repair TV PICTURE TUBE -CHASSIS GUIDE, by weight 27 Ibs. List price methods to rectify Staff. This -to Rider Lab $99.50 them for specific TV easy -use TV tube type chassis guide DEALER NET PRICE $66.34 receivers. Indexed covers all picture tube types used in TV receiver 12U-RHG (12 volts) 150 to 175 watts. Shipping weight by brand name, chassis production from 1946 to }February 1957-over 27 lbs. price and model, listings. 7,1100 list $99.50 Organized by chassis number. and in some each receiver is accompanied by a cases, by Icls yo DEALER NET PRICE $66.34 that the technician can imme skeleton schematic. Although diately locate the correct picture tube type some by knowing the simply Write for literature on other Sizes and Models "tough dog, shop hint" chassis number. x204. Only 51.35. of ATR INVERTERS, priced os low as $9.95 list, type remedies are included, the large majority of COMING IN DECEMBER SEE YOUR JOBBER OR WRITE FACTORY service suggestions cover straightfor- VOLUME 26 1/NEW MODELS VNEW DESIGNS s/NEW LITERATURE ward component replacements for RIDER COMBINATION '.A" Battery Eliminators DC -AC Inverters Auto Radio Vibrators specified symptoms. The MANUAL average tech- world's finest nician may find TV, TRANSISTOR and HOME RADIO data AMERICAN TELEVISION z RADIO CO. it quicker to troubleshoot the receiver than refer ET 11 2r.aluy 7-Neducra Simcc 1431 to a text every time a common breakdown oc- JOHN F. RIDER PUBLISHER. INC. SAINT PAUL 1, MINNESOTA, U. S. A. curs. Is West 14th Street. New Vera a I, N. Y. 100 ELECTRONIC TECHNICIAN November, 1959 EXPAND YOUR Association News CITIZENS BAND BOGEN MARKET (Continued from page 93) With the NEW Hall; West Central Sec'y, LeRoy to t_p_xtot,. 4 -Channel Ragsdale and Western Sec'y, O. W. GONSET 0-12 Andrews. Indiana NEW POPULAR -PRICED ¡_--- ITTA, Indianapolis, in a letter to t_.1... W. C. Pecht, Editor, "TEAM NEWS,' - STEREO LINE FROM THE . I St. Louis, says in part: "We feel that - ,.,rte., the exaggeration of incidentals and the obvious distortion of facts con- TOP NAME IN HI Fl! cerning ITTA's affiliation with NATESA, tend to reflect on ITTA in CHALLENGER COMPONENTS I' . Trer---1 an unfavorable manner. We heartily BY BOGEN resent these implications." Now you can offer your budget con- In another letter from Indianapolis scious customers top-quality stereo to NATESA, Frank J. Teskey states: components at remarkable savings. It's by an "ITTA voted overwhelming the Challenger line by Bogen...and it's G -12 majority to continue affiliation with gl" true high fidelity at truly low prices. NATESA." Citizens Communicator Built to the same exacting engineering 2 -WAY RADIO Massachusetts standards as the regular Bogen line, you A complete 4 -channel station for virtually ETG, Boston, recently presented these Challenger components give unlimited business or private use. in car ... an premium features you can sell with truck... tractor... office... boat... plane! engraved certificate of lifetime membership to Hyman Leve, now a pride...sales-closing price tags you Operates on new 1 1meter Citizens Band. push with profit! Look 'em over at Easy to obtain station license ... merely fill member of the Board of Directors, can out simple FCC form, no exam or special by Pres. Larry McEvoy. He has been your distributor. Or, mail the coupon. skills required. active in the organization since it Technician/Dealers ... was fist founded in 1933, as the Gonset G-12 offers you ... the perfect in- Radio Technicians Guild, and was P ITT - jt/ expensive equipment to serve the big, profits treasurer for 25 years. .t itable Citizens Band market. Now ... with . 4 -channel equipment) Demonstrate ... sell Missouri C7 i, ll ...install... maintain. _i i , TESA, St. Louis, Multiple and Repeat Sales ... reports that Channel 11, KPLR-TV will no longer RC412 Stereo Receiver. An all -in -one stereo G-12 units can operate together as a sys- amplifier, stereo control center and stereo FM -AM tem. Examples-industrials ... yards, ware- air any ads offering "free tube tuner, the RC412 has dual volume controls to houses ...aviation ... branch businesses check." The TV station decided not permit one -hand balancing of the two channels ... construction. Every industrial and com- to expose viewers to anything that and built-in provision for a multiplex adapter. 12 (6 per Fre- mercial account you have is a hot prospectl Power output: watts channel). may be "bait advertising" after talk- quency response: 30 to 15.000 cps ±1 db. Price: Full Feature Equipment .. . ing with TESA officers and the $169.50. Enclosure and legs: $8.50. No tuning ... quartz crystal.controlled channels for highest stability, reliability. Easy, press -to. Better Business Bureau. talk operation ...has front -pone) channel se- TESA -SW chapter recently elected lector, noise limiter, superhet receiver with RF stage, adjustable squelch, transmitter tune in- Bill Moudy, Pres.: Lee Hopkins. .-- dicator. Is fully FCC type accepted. V.P.; Ed Muhleman, Treas. George rci' Dependable ... Scott was retained as Sec'y. Employs latest electronic design techniques. Is rugged, compact. Only 41/2" H, 7" w, by 10"D. Ci'";';4,. Weighs 11 lbs. Hos gimbal mount, built-in 12V North Carolina DC/117VAC universal power supply for fixed or mobile service. NCFEA, Charlotte, at its first an- ÁC220 Stereo Control Center and Dual 10 -Watt nual convention following new of- Amplifier. An astonishing value, the AC220 features low -noise preamp, low distortion, dual vol- per unit ficers were installed: Ken LaRue, 149 Pres., McBroon, V.P., Joe ume controls, loudness switch, channel reversing WITH P -T -T MICROHOML Chas. switch, provision for tape deck and mono -stereo AND CRYSTALS POR OHL CHANNEL, Woods, Treas. and Ray Stanley, mode selector. Comes complete with enclosure. Sec'y. Price: $79.95. Leg kit: $1.85. Send coupon for FREE Citizens Band Booklet ... TC322 FM -AM Stereo Tuner. (Matches AC220) Ohio The sensitive TC322 receives stereo FM -AM. GONSET DIVISION DEPT. ET I'M or AM broadcasts. It features: AFC. pro- Young Spring d Wire Corp. ARTSD, Columbus, membership vision for multiplex adapter, automatic volume 801 South Main Street. Burbank, Calif. voted to establish a committee to control, illuminated dial scale, and comes com- Gentlemen: Rush complete details on your a licensing plete with enclosure. Frequency response: FM: technician dealer plan and free book- formulate program. 2D to 15,000 cps ±1 db: AM: 20 to 3.500 cps let: "11 -meter Citizens' Band Radio" Leg kit: Pennsylvania ±1.5 db. Price: $109.50. $1.85. NAM' r BOGEN-PRESTO. DEI'T. ET -119, PAlt.sSlUS, N. J. ESDA, Pittsburgh, Publicity Di- A Division of the Siegler Corporation ADDRLSS rector, David J. Baird, reports some Please send me more information on members are devoting more time in the new Challenger components. L CITY ZONE STATE I organization work than in their own - Name shops. "Not because we can afford GONSET it," he said, "but we know we must Address Division of Young Spring & Wire Corporation if we are to stay in business and City Zone State . B01. SOUTH MAIN ST., BURBANK. CALIFORNIA secure our future." L

ELECTRONIC TECHNICIAN November, 1959 101 Washington Model 5.5000, 20+20W Stereo Dual Amplifier -5189,50 TSA, Seattle, reports eleven NATA shops are meeting weekly -i000F.fm0: with local 46 of the IBEW. Subjects being discussed, among other things, E are wages, shop hours, Model S-300011, FM Tuner-SI05.50 apprentice training and jurisdition of electronic service work. PYRAMID® POINT

Century TESTER-REACTIVATOR BY F1DELITONE Model S.4400, Stereo Preamp.+36W Amp. -3159.50 Employing a number of features, including a "multi -head" test cable. 0 0 0 0 ©© 0 eliminating the necessity for other cables and adapters, the Model CRT2 Model S-200011, FMAM Tuner -5I15.50 is reported to test, repair and reactivate rn..+ ear:. .esso all B/W or color tubes. Separate fila -

. ..- Model S-100012, 36W Monaural Amplifier -5109.50

The "complete matching home music center" E-...-r-`" -monophonic or stereophonic. L"\ J

Again another year-recommended by one of the most respected and authoritative Re- Shaped to follow the record . search Testing Organizations as embodying ' numerous, more grooves exactly - - . pick more advanced engineering 2 .i eleettlet "firsts"-more inherent quality for trouble - free operation-more real value for every up all the recorded sound dollar than many competitive products sell- for ing more. PLUS: Features that In their ment voltages are provided, including New Ordinary unsurpassed engineering win- the most dis- Pyramid the latest 2.35 and 8.4 v. types. In Point Round criminating audio -hobbyist; but also features oak Diamond Diamond that In their simplicity and ease of opera- carrying case with a compartment Price $57.50. Traces the centerline Does not trace the tion appeal to everyone-housewife, audio - Century Electronics Co.. of the microgroove centerline of the novice, or Just plain music lover. Cabinetry 111 Roosevelt Ave., Mineola, N. Y. with more surface con- groove. Has less sur- tact. Accurately of quiet elegance that blends with any, decor. (ELECTRONIC con- face contact. Pinches TECHNICIAN 11-15) tacts all frequency rides And and bumpily in Sherwood, unmatched at any price, is areas. Assures mini- high frequency areas Fair Trade priced for your assurance that once mum distortion, maxi- -distorts many sound mum you have bought Sherwood, you didn't miss STATEMENT REQUIRED BY THE ACT OF AUGUST true sound. impressions. a better "deal" someplace else. Sherwood 24, 1912, AS AMENDED BY THE ACTS OF MARCH 3, 1933, AND JULY 2, 1946 (Title 39, United Is only for those who want the Ultimate.:, States Code, Section 2331 SHOWING THE OWN- For further details writer Sherwood Etet- ERSHIP, MANAGEMENT, AND CIRCULATION OF Ironic Laboratories, Inc., 4300 N. California ELECTRONIC TECHNICIAN, published monthly at Bristol, Conn., for 1, 1959. Avenue, Chicago 18, lit, October 1. The names and addresses of the publisher, editor, managing editor, and business managers are: l'ublisher, Itoward A. Reed, 174 Waverly Rd.. Scarsdale, N. Y.; Editor, Albert J. Forman, Wood - most honored of them áII brook Dr., Stamford, Conn.: Managing Editor, Ar- thur P. Sal -berg, 430 Saratoga Ave., Brooklyn, N. V. Business Manager, none. 2. The owner is (if owned by a corporation its name and address must be stated and also imme- It's here! The new Pyramid Point diately thereunder the names and addresses of SHERWOOD stockholders owning or holding one per cent or Diamond - the only needle shaped more of total amount of stock. If not owned by a to corporation, the names and addresses of the indi- simulate the original recording vidual owners mint he given.) Electronic Techni- stylus. This exclusive new pyramid cian, Inc., 480 Lexington Ave.. New York 17, N. Y.; Beatrice S. Berger, 109-01 72 Rd.. Forest shape reduces distortions as much as Hills, N. Y.: Charles F. Dreyer, 300 Ilayward 85%! Ave., \It. Vernon, N. Y.: .\Ibert J. Forman, Now, for the first time, the full \\'oodbrook Stamford, Dr.. Conn.; Nancy I. ,lc - pure tones of all the original recorded Gaughan, 83-02 Cornish Ave., Elmhurst. N. Y.: Robert E. Nickerson, 27 \leadowbank Rd., Old sound - stereo and monophonic Greenwich, - Conn.: Howard A. Reed. 174 Waverly Rd.. Scarsdale, N. V.; \)orris J. Rubin, 70-33 are faithfully reproduced. And the 175 St.. Flushing 65, N. V. greater surface 3. The known bondholders, mortgagees, and contact area between other security holden owning or holding I per cent needle and record prolongs your nee- or more of total amount of bonds. mortgages, or other securities are: (If there are none. so state.) dle and record life. \I. Clements, 114 Ludlow \ve., Spring Lake. N. J. 4. Paragraphs 2 and 3 include. in cares where Be one of the first to install this the stockholder or security holder appears upon newest needle discovery new the books of the company as trustee or in any - the other fiduciary relation, the name of the person or Pyramid Point Diamond. Contact your corporation for whom such trustee is acting: also the stalentents in the two paragraphs show the Fidelitone distributor today. affiant'o full knowledge and belief as to the circumstances and conditions under which stockholders and security holders who do not appear Over 30 years of quality needles upon the books of the company as trustees, hold stock and securities in a capacity other than that of a bona fide owner. (Signed) \(.BERT I. FORMAN. Editor Sworn to and subscribed before me this (7th day of September. 1059. MORRIS T. Rl'BIN. Notary Public Fidelitone State of New York. No. 41-3.189950 Chicago 26, Illinois Queens County FOR COMPLETE SPECIFICATIONS WRITE DEPT ET -11 Term espires March 30. 1961 'Best buy on records"

102 ELECTRONIC TECHNICIAN November, 1959 INDEX TO ADVERTISERS November, 1959 TV TUNERSREBUILT Aerovox Corp. 18 Moss Electronic, Inc. 67 Agency: Lescarboura Advertising, Inc. Agency: Bass & Co. MAKES 81 MODELS Allied Radio 98 Motorola Inc., Parts & Accessories . 91 .Al[ Agency: George Brodsky Advertising, Inc. Agency: Leo Burnett Co., Inc. 103 Television & Rodio Co. . . 100 Olson Radio Corp. VHF American EXCHANGED Agency: Firestone -Goodman Adv Agency, Agency: Wilson & Waggoner Advertising .- Inc. 88 OR Inc. Oxford Components, IJH F Amperex Electronic Corp. 98 Agency: Sander Rodkin Advertising Agency OVERHAULED Agency: Sam Groden, Inc. Inc. $9.95 Amphenol-Borg Electronics Corp. 4 Philco Corp. 12 NET Agency: Burton Browne Advertising Agency: Maxwell Associates, Inc. 93 90 DAYS Astatic Corp. Cover Ill Planet Sales Corp. WARRANTY & Assoc. Agency: R. J. McCollister Co. Agency: Gcrdon A. Pihl Apparatus Co., Inc. 97 I. COMBINATION Atlas Sound Corp. 94 Precision I UHF/VHF Agency: tam & Kirshner, Inc. Agency: Sam Graden, Inc. UNITS 25 B & K Manufacturing Co. 57, 64 Pyramid Electric Co $19.90 Agency: Henry H. Teplitz Adv Agency Agency: Burton Browne Advertising Bogen -Presto Co. 101 Quern -Nichols Co. 86 Agency: Friend -Reiss Advertising, Inc. Agency: Stral Advertising Co. Bussmann Manufacturing Co. 69 Radio Corporation of America IV 4 Agency: Henderson Advertising Co. 28, Cover Castle TV Tuner Service 103 Agency: Al Paul Lefton Co. ALIGNED TO ORIGINAL STANDARDS 23 CBS Electronics 9, 10, 11 Raytheon Cc. 22, Fuller & Smith & Ross, Inc. Agency: Bennett & Northrop, Inc. Agency: Price includes labor and minor parts Centrelab Div., Globe -Union, Inc. .. 78 Reeves Soundcraft Corp. 62 only, defective tubes and damaged Agency: Stral Advertising Co. Agency: The Wexton Co., Inc. major parts are extra at net prices. Channel Master Corp. 26, 27 Rider Publisher, Inc., John F 100 Agency: Jack Gilbert Associates Agency: Duso Advertising Inc. Forward tuner complete with tubes, shield Corp. 21 Chicago Miniature Lamp Works ... 90 Rockbar cover and any damaged parts. Advertisers Inc. Agency: The Wexton Co., Inc. Agency: Merchandising MAKE AND MODEL Cornell-Dubilier Electric Corp. 58, 59 Rohn Manufacturing Co. 31 QUOFE Agency: Friend -Reiss Advertising, Inc. Agency: Jackson, Hoerr, Peterson & Hall, Delco Radio Div., General Motors .. 24 Inc. F.O.B. CHICAGO OR TORONTO Agency: Campbell-Ewold Co. Sangamo Electric Co. 5 Vs'e will ship C.O.D. Duotone Co. 90 Agency: Arthur R. Mogge, Inc. Inc., H. H. 89 Agency: Halsted & Van Vechten, Inc Scott, CASTLE TV TUNER SERVICE EICO 99 Agency: Arnold & Co., Inc. WESTERN 152 MAIN ST. Agency: tam 8 Kirshner, Inc. Seto Manufacturing Co. 72 5710 N. 13 Electronic Technician 89, 92 Agency: Firestone -Goodman Adv Agency, CHICAGO 45, IlL. e TORONTO Electro Products Laboratories 95 Inc. U.S.A. CANADA Agency: Robertson, Buckley & Gotsch, Inc. Sencore-Service Instruments Electro -Voice, Inc. 13 Corp. 81, 83, 85, 87 Agency: Henry H. Teplitz Adv Agency Agency: R. N. Johnson Advertising Erie Resistor Corp. 82 Sherwood Electronic Laboratories, Agency: Meldrum & Fewsmith, Inc. Inc 102 Fidelitone, Inc. 102 Agency: Burton Browne Advertising Agency: W. D. Lyon Co., Inc. Simpson Electric Co. 71 G -C Electronics Co. 77 Agency: The Fensholt Advertising Agency, Agency: Paul J. Steffen Co. Inc. General Electric Co. 16, 17 Sonotone Corp. 30 Agency: Maxon, Inc. Agency: Doherty, Clifford, Steers & Shen - Globe Electronics, Div. of Textron, field, Inc. Inc. 93 South River Metal Products Co., Inc. 96 Agency: Town Crier Agency Agency: South River Advertising & Printing Gonset Division 101 Sprague Products Co. 32 Agency: The Harry P. Bridge Co. T ` Agency: Clayton F. Bane Adv Agency Heath Co. 74 Stromberg-Carlson Co. 8 Agency: Advance Advertising Service, Inc. Agency: The Rumrill Company, Inc. ` Hickok Electrical Instrument Co. . 60, 61 Sylvania Div., General Telephone & Agency: Ritchie & Settler, Inc. Electronics 50, 51, 63, 84 International Electronics Corp. 20 Agency: J. Walter Thompson Co. FREE ) Agency: Schneider-Stogel Co. Technical Appliance Corp. 94 International Resistance Co. 62, Cover 11 Agency: Lescarboura Advertising, Inc. Agency: Arndt, Preston, Chopin, Lamb & Triad Transformer Corp. 89 Keen, Inc. Agency: Fletcher Richards, Calkins & Jackson Electrical Instrument Co. 95 Holden. Inc. Agency: R. L. Conhoim Advertising Triplett Electrical Instrument Co. . 2, 3 Jensen Manufacturing Co. 104 Agency: Burton Browne Advertising Agency: Burton Browne Advertising TungSol Electric Inc. 65 Fill in coupon for a FREE One Year Sub Bargain Agency: E. M. Freystadt Associates, Inc. scription to OLSON RADIO'S Fantastic Jerrold Electronics Corp. 80 Packed Catalog Unheard of LOW, LOW, Agency: Lavenson Bureau of Advertising Utah Radio & Electronic Corp. 19 WHOLESALE -PRICES on Brand Name Inc. Agency: Wright, Campbell & Suitt, Inc. Speakers, Changers, Tubes, Tools, HiFi's, 14, 15 V -M Corporation 29 Stereo Amos, Tuners and thousands of other JFD Electronics Corp. Electronic Bargains. Agency: Delphi Advertising Inc. Agency: Mayer-Klann-Linabury Advertising JW Electronics 86 Inc. NAME Kester Solder Co. 92 Wen Products, Inc 96 ADDRESS Agency: Paul J. Steffen Co. Agency: Burton Browne Advertising 73 Mallory & Co., Inc., P. R. 54, 55 Westinghouse Electric Corp. CITY ZONE STATE Agency: Grey Advertising Agency, Inc. Agency: The Aitkin-Kynett Co., Inc. in electronics 7 If eau have a friend interested Marjo Technical Products Co. 91 Winegard Co. 6, send his name and address fur a FREE sub- Agency: Advent Associates, Inc. Agency: Gourfain-Loeff, Inc. s,ription also. Mercury Electronics Corp. 79 Winston Electronics 90 Agency: Nat Kermin Advertising Agency: Steiner & Wall Advertising, Inc. RADIO Miller Co., J. W 75 Xcelite, Inc. 88 OLSON - CORPORATION . Agency: Balsam Advertising Agency: Howard W. Nareau Advertising Mosley Electronics, Inc. 97 Zalytron Tube Corp. 76 502 S. Forge St. Akron 8, Ohio Agency: H. George Bloch, Inc. Agency: Bergman Advertising Agency

ELECTRONIC TECHNICIAN November, 1959 103 the air suspension principle brought to peak performance with FLEXAIR* high -compliance moving system and BASS-SUPERFLEX* advanced FOR enclosure acoustics TR-10 TR1-ETTE* 3 -Way Speaker System STEREO Compare the Jensen TRI-ETTE with any bookshelf speaker and let your own ears tell you the reason for its rocketing AND MONO... popularity ... it sounds better! It's what you'd expect Jenáen from advanced Jensen engineering that begins where others LOUDSPEAKERS YOU leave off. Efficient ... needs only a 10-watt amplifier. SHOULD Handsome, too, in graceful contemporary design with fine woods. And there's an economical unfinished model for KNOW utility and build -in user DF -1 DUETTE 2 -Way THERE IS Speaker System Here is a new high point in speaker value made possible by another Jensen first ... an entirely new and different high - SOMETHING compliance 8" woofer able to move more than twice as far as previously available units. An excellent solution for high quality stereo sound at minimum cost. New un- BETTER finished utility model to wood finish or paint as you choose.

Jensen MANUFACTURING COMPANY 6601 S. Laramie Avenue Chicago 38, Illinois cir,s,o o. ,, ,. wux co, In Canada: Renfrew Electric Co., Ltd.. Toronto In Mexico: Radios Y Television, S.A., Mexico D.F.

WRITE FOR BROCHURE KP

TR-10 r *T.M. 1 Í TRI-ETTE $119.50 1,1

DF -1 ` L . _- - DUETTE $79.50

t - Ja

TR-10U UNFINISHED $89.50

WITH NEW -17 "ELE O AIE" WOOEEf

All of the loudspeakers above have the new FLEXAIR woofer .... a Jensen development for better speaker performance.

IN_ loi ` We'll prove to you that Jensen DUETTE 1' and TRI.ETTE are better engineered .. . t + I better performing. Write for free reprint of published engineering paper "Im- DF -1U UNFINISHED 6 provement in Air Suspension Speaker t I Enclosure with Tube Venting." $59.95

104 (124 pages in this issue, including Circuit Digests) ELECTRONIC TECHNICIAN November, 1959 THE WHOLE MULTI -MILLION DOLLAR MARKET HAS HEARD THAT ASí..TIÇ ID-' GES ARE THE ONLY COMPUTE

- LINE THAT MEETS EVERY SALES OPPORTUNITY r

AS EASY AS CHANGING A LIGHT BULB . . . NO INSTALLATION OR SERVICE PROBLEMS

You've had the message by now-that mil_ions of plug-in phono cart_idg:P have already been sold ... that Asiatic Plug ins represent a tremendous multi-milbn dollar replacement market ... and that THE ONLY COMPLETE, SINGLE SOURC3 PLUG-IN LINE ON THE MARKET 1S ASTATIC'S! So why not use the message: Act now to cash in on this RICH and SKY- ROCKETING MARKET. Get into the plug-in business aid get into it all the way- never missing a single sale-with THE COMPLETE ASTATIC PLUG-IN DINE.

EASY, AUTOMATIC SALES WITH ASIATIC MERCHANDISING PACKAGE I r You sell from this plastic display -merchandiser which is pilfer -proof, holds an assortment of a dozen cartridges. Information under each cartridge tells the customer which model he needs. Colorful, attractive window card Ciao -free of charge-tells 'em you've got 'em! 1=1~ 11 I' Own CALL YOUR DISTRIBUTOR OR WRITE FOR FULL DETAILS

rt vru OVER CORPORATION, CONNEAU )H O IN CANADA: CANADIAN ASIATIC LIMITE TORONTO, ONTARIO EXPORT SALES: ROBURN AGENCIES INC 431 GREENWICH ST., N. Y. 13, N. Y., U

.t i .l Ñ;-` l ' t

n , 1 GO BY BRAND -GO BUY ASTATIC

' -A MODEL FOR ,:EVERY APPLICATION - STEREO. OR 'MONAURAL - DIAMOND. OR SAPPHIRE TIP CORRECT HORIZONTAL ADJUSTMENTS ARE IMPORTANT! Incorrect setting of the horizontal -drive DIRECT and -DRIVE linearity controls can cause excessive cathode current. To assure long life of the 6CD6-GA, measure its cathode current, and adjust drive and linearity controls for and lowest current consistent with linearity. To measure cathode current in the RCA Victor KCS-68 and KCS-81, and other chassis RCA I utilizing similar direct -drive horizontal - ppi output circuits, simply remove the B+ fuse 6CD6-GA 6pQ6 l; and connect a dc milliammeter across the fuse holder, as shown in Fig. E.

FIG. E Here's how you can get better service from the 6CD6-G,A1 500 MA D.C.

Have you had difficulties with 6CD6-GA's operating in direct - drive circuits? If so, this message is most important to you.

Here's a simple way to "lick" the problem. REMOVE M.O.T. FUSE 8+ In horizontal -output circuits utilizing trans- Possibilities of premature failure of the former or auto -transformer coupling to the popular 6CD6-GA when used in direct - deflecting yoke the damper tube is usually drive circuits can be reduced by lowering

connected across a portion of the flyback the negative peaks of the flyback pulse. VOLTAGES ARE IMPORTANT, TOO ! transformer, and acts to reduce "ringing" This is done very as simply shown below Check screen -grid, cathode, and control - after each flyback pulse. in Fig. C. Add a 5,000 -ohm 5 resistor -watt grid voltages. If the control -grid voltage is in series is the with "C". ("C" part of ex- low, check waveform and amplitude of the FIG. A isting usually circuit, about 33llltf). sawtooth driving voltage at the control

FIG. C grid. Make horizontal -oscillator circuit ad- HIGH -VOLTAGE RECTIFIER justments, if necessary. Check B+ and line voltages.

FIG. F Waveform of flyback pulse at the plate of hori-

zontal -output tube in a typical transformer- 6CD6-GA coupled circuit.

In most direct -drive circuits, those in which 000 HIGHVOLTAGE the horizontal coils of the deflecting yoke ohms TRANSFORMER are connected in series with the horizontal - s colts output transformer, the damper tube is not connected across any portion of the high - -- voltage transformer. Therefore, high -am- Typical direct -drive circuit, with 5,000 -ohm 5 - plitude "ringing" voltage may be present. watt resistor to be added shown in broken line. Should the negative peaks of the "ring- To provide adequate ventilation and H -V in- voltage ing" exceed the maximum plate - sulation, the resistor should be spaced away voltage of the rating horizontal -output from other parts, wires, shields, etc. Typical operating voltages of a 6CD6-GA hori- tube, the tube may be damaged. Thus, zontal -output tube in the direct -drive circuits FIG. D premature failure of a horizontal -output used in the RCA Victor KCS-68 and KCS-81 chas- tube may occur because of improper con- sis, measured to chassis ground, with an RCA ditions. .+. VoltOhmyst®.

FIG. B RCA-6CD6-GA TUBES ARE DYNAMICALLY CHECKED

IN DIRECT -DRIVE CIRCUITS ! Waveform at the plate of horizontal -output tube in a typical direct-drive circuit with added To insure top performance and long life, 5,000 -ohm 5 -watt resistor. The resistor lowers production samples of RCA-6CD6-GA Waveform at the plate of horizontal -output tube the "O" of the transformer to reduce the ampli- tubes are factory -checked in direct -drive in o typical direct-drive circuit. tude of the "ringing" voltage. circuits under typical operating conditions. Keep your profits up by keeping 6CD6-GA callbacks down. Check and adjust hori- ANOTHER WAY RCA HELPS YOU IMPROVE YOUR BUSINESS zontal circuits. And, if you replace a 6CD6-GA, always replace with RCA! i. RADIO CORPORATION OF AMERICA lei)Electron Tube Division Harrison, N. J. Do you have your copy of the RCA Triple Pindex? Ask your RCA Tube Distributor about this useful servicing aid today.