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ADIO- ELECTRONICS in ALL ITS PHASES Another First! This Is the Long- Awaited Hallicrafters SX -42, a Truly Great Greatest Communications Receiver

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LAPO De Forest Anniversary Number' A 40 Years of the Vacuum Tube ká ADIO- ELECTRONICS IN ALL ITS PHASES Another first! This is the long- awaited Hallicrafters SX -42, a truly great Greatest communications receiver. The tremendous frequency contin- range of the SX -42, greater than ever belole available in a receiver of this type, is made possible by the develop- uous frequency ment of a new "split-stator" tuning system and the use of dual intermediate frequency transformers. Packed coverage of any with advance features that every ham and every other radio enthusiast desires, the SX -42 clearly lives up to communications the Hallicrafters ideal of "the radio man's radio." From now on watch Hallicraflers - the name that's remembered by the veteran, preferred by the radio ama- receiver- from teur. See your distributor for demonstration of the SX-42 and for colorful literature describing this great set in 540 kc to 110 Mc complete technical detail. Because of the pre- cise engineering that must be done on the SX-42 and because the parts supply has not been con- tinuous, top produr. lion peaks have not yet been reached. In the immediate future deliveries will necessarily run behind the demand. but the SX-42 is definitely w orth wailing tor. $25000 Amateur Net hallicrafters RADIO Adjustable Bose rut uuAtrus CO .. IACILLlIC1 ot cSOla AHD 11.1(110141C wuVUrNr, CHICAGO IC u. S :. for "eye- angle" tuning No. B -42 áZ50 Io.e.A.stp....et ear Hallicrafters joins the entire radio industry in VIP congratulations to Lee De Forest ... without whose ingenuity and inventiveness such advanced communications equipment as the Hallicrafters SX -42 would have been impossible. SINCERELY, A N D A L L T H E J, \ HALLICRAFTERS KIT 1 I send you Soldering Equip ment and Radio Parts ; show you how to do Radio soldering; how to mount and connect Radio parts; give you practical experience. KIT 2 Early in my course I ,- you how to 3 buildtamw this N. R. I. Tester with parts I , send. ]t soon helps y _ fix neighbor - / You _...._......... _t,.. ..... hood Radios and earn EXTRA money , ' in are time. Technician Spare Time Se A cry ín by PtA __ with BIG KITS of Le ..., KIT 3 RADIO PARTS I send you You get parts to build Radio Circuits; APPROVED Do you want a good -pay job in then test them; see how r. far training the fast-growing Radio Industry they work; learn how to under -or your own Radio Shop? Mail design special circuits; how to the Coupon for a Sample Lesson locate and repair circuit defects. G.I.BI LL and my 64 -page book. "How to Be a Success in Radio-Tole- ' ,ion, Electronics," both FREE. See how I will train you at home -how you get prac- tical Rad,o experience building. testing Radio Ì You get parts to build circuits with BIC KITS OF )'ARTS I send! KÌ4 this Vacuum Tube Power Pack; make changes Many Beginners Soon Make Extra Money which give you experience with in Spare Time Whits Learning packs of many kinds; learn to The day you enroll I start sending EXTRA correct power pack troubles. MONEY JOB SHEETS that show how to make EXTRA money fixing neighbor? Radios in spare time while still learning! It's proba- bly easier to get started now than ever before, because the Radio Repair Business is booming. Trained Radio Technicians also find profitable opportunities in Police, Aviation. Marine Building this A. Radio, Broadcasting, Radio Manufacturing. Public Address work. Think MT 5 of even opportunities as Television, FM, and Electronic devices M. Signal Genera- become available tor gives you more valu- to the public! Send for FREE books now! able experience. It pro- Find Out What NRI Can Do For You vides amplitude- modulated Mail Coupon for Sample Lesson and my FREE 64 -page book. Read the signals for many tests and details about my Course; lettera from men I trained; see how quickly, experiments. easily you can get started. No obligation! Just MAIL COUPON NOW in envelope or paste on penny postal. J. E. SMITH. President, Dept. 7AX, National Radio In. titule, fionccr Home Study Radio School, Washington 9, D.C. Our 33rd Year of Training Men for Success in Rodio You build this KIT Ó Superheterodyne Receiver which brings in local and distant stations -and gives you more ex- perience to I MR. J. E. SMITH, President, Dept. 7AX help you I National Radio Institute win suc- I Washington 9, D.C. cess in Radio. 1 Mail me FREE. Sample Lesson and 64- 1 Page book about how to win success in 1 Radio -Television. Electronics. (No sales- man will call. Please write plainly.) Age My Course I Name Includes Training in Address City State TELEVISION (Please include Post Office zone number) ELECTRONICS `mm, -a FREQUENCY MODULATION Approved for Training under GI Bill RADIO -CRAFT for JANUARY, 1947 PS dC7E.70C3E o.. 0:e l/ i/ere.oae N. U. AUTO RADIO VIBRATORS ARE BUILT FOR ENDURANCE! 1. Welded pole pieces for life- 9. Face of center reed weight is time adjustment accuracy. surface -ground to improve mag- 2. Snug fitting synthetic sponge netic coupling. insulauon for quiet operation. 10. Center reed uniformly breakage. 3. Spot -welding of fingers, in stressed to prevent contact against each other and 11. Specially tempered reed and the center reed, reduces voltage side contact arms. drop in center reed assembly. 12. Corrosion resistant silver - 4. Vibration proof adjustment by plated side contact arms. means of double -screw stack. 13. Precision ground bakelite 6. Pressure plate on top of stack spacers for structural and dimen- keeps stack tight under tension sional stability. over wide ranges of temperature. 14. Steel ring, molded into shock 6. Extra flexible roped wire leads mount, centers and holds vibra- eliminate strain and weakening. tor upright when can is sealed. 7. Metal can, spun at bottom, 1S. Neoprene wafer in hermeti- seals vibrator against dust and dirt. cally sealed vibrators effectively it Plated piac acsure m.n.mox se.atsaihraror agnt mecpher :e contact resistance. pressure changes and moisture. Typical Synchronous Vibrator Construction NEU' LINE COVERS 97% OF ALL VIBRATOR REPLACEMENTS UNIVIBE -the complete 8-model vibra- Yes, Univibe is right at the top in tor line- covers the replacement needs quality. Well known "balanced reso- 1907-1947 of over 2500 auto radio models! Pro- nance" design, of extra heavy duty con- vides quick, easy replacement of worn struction, means 33% longer vibrator lije out vibrators in 182 makes of auto by actual test. radios, as old as 1936! Here is another money -making radio Think of it -97% service coverage parts line for National Union dealers. with only 8 fast- moving numbers -every For immediate delivery order Univibes one a repeat profit producer! today from your N.U. Distributor. NATIONAL UNION RADIO CORPORATION, NEWARK 2, N.J. NATIONAL UNION RADIOS, TUBES AND PARTS Radio Sets Phototubes Receiving Tubes Transmitting Tubes Special Purpose Tubes Cathode Roy Tubes Auto Vibroors Ponel lamps Flashlight Bulbs Ballasts Volume Controls Condensers Batteries RADIO -CRAFT for JANUARY, 1947 2 e "LL:-?"M_COMWlS . ... 'f[Sl4ian -Afterr,.. - CAPACITORS, Capacity Ve bee elves In the rating column an Id Ibfd. fer Electrolytic and Paper Capacitors, bnd Iñ tumid. let Mica and Ceramic Capelles. /LACEMENT DATA IDENOFIGTION COORS CORNELL. JU1wG !' TRUETONE MALLORY SOUR SPRAGUE AEROVOX AND DU'ILIER PMT Pk, PART No. PART W PMT No. PART No. INSTALLATION NOTis CAP. VOLT PART No. 40- ..100 .500256 . FP306 p7-401.20-130 EIr24 MUD UP3515 *Filter gUR 20 150 ;c2 400 502158 17429 8-0-2 TC-2 484-.2 DT4P2 Lfae ..Ioolatia8 9 400 ..502157 SP428 S-005 TC-15 484-.05 aT4S5 Line Filter .01 502151. TP421 TC-11 484 -.01 1754.51 Par. .Plata1 t; 004 .400 ¢02150 TP407 8-0.004 TC-24 484 -.004 Dr604 -'AU410 Coupllag What's your biggest headache when factured since January 1, 1946 -even PUBLICATION DATES: servicing radios? Identifying parts? W'h to the restringing of dial cords. They do SE No. 9 December 19 PHOTOFACT FOLDERS it's easy to locate this by means of pictures, full -page sat No. 10 December 29 and identify any item you want to schematics, original technical notes find. Just look at the Complete Parts help that you work faster, more accu- Cut this out and MAIL IT TO YOUR List . .. a list that's keyed to clear rately...easily increase the number of jobs DISTRIBUTOR. If you do not know chassis photographs and a full page, you can do in a week by fifty percent. his name and address, send it directly easy -to -read schematic diagram. For PHOTOFACT FOLDERS are sold in to Howard W. Sams & Co., Inc., 2924 East Washington instance, the capacitor listing alone sets of 40, each set covering new Street, Indianapolis 6, radios, Indiana, and we will see that your near- gives complete data on capacity, volt- phonographs, record changers, intercom- est distributor gets it. In Canada- age rating, function, replacement types munication systems, recorders and power write to A. C. SIMMONDS & SONS, - , , even includes installation notes. amplifiers within a short time after 301 King Street East, Toronto, Ontario. Canadian Price No service problem can stump they reach the market. Their cost is $1.75. you when you use PHOTOFACT only $1.50 a set, including membership PLEASE PRINT FOLDERS. They result from the actual in the Howard W. Sams Institute. examination of the receiver involved, No other radio service compares with and are not EJSend Set No.10 J Send Set No.9 copied from the manufac- PHOTOFACT FOLDERS in completeness, turer's service (Circle one or more of following) Send data or from looking at accuracy or timeliness.
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    HIGH-SEAS FISHERIES OF THE U.S.S.R. UNHED STATES DEPARTMENT OF THE INTERIOR FISH AND WILDLI FE SERVICE BUREAU OF COMMERCIAL FISHERIES WASHINGTON 2S , D.C. FISHERY LEAFLET 482 C 0 V E R VIEW OF FACTORY- TRAWLER PUSHKIN. T HE VESSEL IS EQUI P PED fOR STE RN TRA Wll ,C AN HAUL UP TO 10 TONS Of f i SH ABOARD THROUGH THE STERN SllPWAY , AND CAN fREE ZE AND PACKAGE THE fiSH AT SEA. UNITED STATES DEPARTMENT OF THE INTERIOR, FRED A. SEATON, SECRETARY FISH AND WILDLIFE SERVICE , ARNIE J. SUOMELA, COMMISSIONER BUREAU OF COMMERCIAL FISHERIES, DONALD L. McKERNAN, DIRECTOR HIGH-SEAS FISHERIE S OF THE U.S.S.R. BY MORTON J. GARFIELD COMMODITY-INDUSTR Y ANALYST BRANCH OF SPECIAL REPORTS DIVISION OF INDUSTRIAL RESEARCH AND SERVICES F I SHERY LEAFLET 482 WASHI NGTON 25) D.C . MAR CH 1959 IT I GII-SE,'\S FTIJID111h3 OF TIT:: u.s.s.n. Contents P ec Status and trends •••••••• •••••• . · · . 1 Principal hir,h-scas fisherios •••••••••••· . 4 Arctic- and F-a ltic-based operations . 4 Ca tch and principal species • • • • • • • • • • • • • • 4 Fishing ports • • • • • • • • • • . · . · . 7 Far Eastern-based operations ••••• • • · . • • • 7 FishinG vessels and equipment •••••••••• •• •• • • 10 Foreien trade ••••••••••••••• · . · . 13 International activities and research • • • • • • • • • • • 15 \Vha ling .... ...... · . 16 List of principal sources ••• • •••••••••••· • 17 Tables Table l.--Catch of fish and shellfish, by selected species, 1948 and 1953-56 Table 2.--:Ha rine landines at Arctic and Baltic ports, by f i shing ar eas , 1956 Table 3.--Number and type of fishing craft, 1940, 1948, 1953- 56 Table 4.--Imports of fishery products by principal countries of origin, 1955-57 Table 5.
  • Amplifier Radio Frequency Am-1881/U

    Amplifier Radio Frequency Am-1881/U

    TM 11-6625-353-35 D E PAR T M E N T O F T H E A R M Y T E C H N I C A L M A N U A L FIELD AND DEPOT MAINTENANCE MANUAL AMPLIFIER RADIO FREQUENCY AM-1881/U HEADQUARTERS, DEPARTMENT OF THE ARMY 17 FEBRUAY 1961 WARNING DANGEROUS VOLTAGES EXIST IN THIS EQUIPMENT Be careful when working on the 115-volt (or 230-volt if used) ac line connections and on the 390-volt plate and power supply circuits. Serious injury or death may re- sult from contact with these points. DON’T TAKE CHANCES ! This equipment contains a selenium rectifier. When selenium rectifiers fail because of burnout or arc-over, poisonous fumes and compounds are released. The fumes have a strong odor and should not be inhaled. Provide adequate ventilation immediately and do not handle the rectifier until it has cooled. TM 11-6625-353-35 TECHNICAL MANUAL HEADQUARTERS NO. 11-6625-353-35 DEPARTMENT OF THE ARMY Washington 25, D. C. 17 February 1961 AMPLIFIER, RADIO FREQUENCY AM-188/U Paragraph Page CHAPTER 1. THEORY Scope . 1 2 Block diagram . 2 2 Stage analysis . 3 2 CHAPTER 2. TROUBLESHOOTING Section I. General troubleshooting techniques General instructions . 4 7 Organization of troubleshooting procedures . 5 7 Test equipment required . 6 8 II. Troubleshooting Amplifier, Radio Frequency AM–1881/U Checking filament and B circuits for shorts . 7 8 Test setup . 8 9 Localizing troubles . 9 9 Stage-gain measurements . 10 11 Dc resistances of transformer T1 . 11 14 III. Repairs and adjustments General parts replacement techniques .