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ELECTRONIC CROSSOVER AUDIO AMPLIFIER Radio-Electronics 95 TELEVISION SERVICING HIGH FIDELITY HUGO GERINSBACK, Editor Transistor shortwave Superregen Works Past 30 NC! An Easy- to-Build Low-Cost Amplifier Customers We Could Do Without! Transistors Power 101eter Transmitter Prefinished Kits Aid Audio Builders 1 (See page :8) www.americanradiohistory.com - ...and think if you're an independent service man your best buy is Ask your distributor for your copy of the new Du Mont Picture Tube Data Chart CATHODE -RAY TUBE DIVISION, ALLEN B. DU MONT LABORATORIES, INC. 750 Bloomfield Avenue, Clifton, N. J. www.americanradiohistory.com Career For a Successful in Radio -Television Train at Home in Spare Time with N. R. I. OLDEST and LARGEST Home Study Radio -Television School Prosperous Fast Growing Industry Offers You .R.I. Trained These Men GOOD PAY - BRIGHT FUTURE - SUCCESS ENGINEER STATION WHPE s"VPIu TOAcahcINmeaNs n TskfaW,us nl N . tReOoWan RdgNOiTionRRH erIeK e,rC pM aAIfAi orRr oN sOph,We LorpIaHHN.t ePIANdGE eH.w"a bhdIoote'.mst t eFethr,o erji sota br ra,ej iosdnbprei evdwce timset dhaa nfa bo ewfru twhtteuohrr eagc te-a tfrhsi, e na ldihkven eaoosdwu i t-ns g ha$eon wtbdse cytttaohenuer aNAmtNRe nIDht o 5Nm0leRe-a5 Ir0 inn f umbrsenypti ahsrhpoeerd as, c.t ityYmiocoiuenu g slfe touarwdr nyiRt hwba iadtasihcoi ct-yu TopaVurli r.ne hcqWaiupniildptehs-s can train at home for Radio -Television. and your head. You get dependable training, backed up by the reputation of the oldest and QUKK SPARE TIME CASH 1ODAY'S OPPORTUNITY FIELD largest home study Radio -TV school. "Knew nothing about Radio- TV when I enrolled. After 15 lessons Training PLUS OPPORTUNITY is the ideal ADD TO YOUR INCOME SOON started repairing sets. My future combination for success. And today's OPPOR- looks bright." DONALD B. TUNITY he d is Radio-Television. Over 125 $10 -$15 A WEEK IN SPARE TIME ACKERMAN, MINNEAPOLIS, million hone Radios plus 30 million sets in Soon after enrolling many start earning extra MINNESOTA cars, plus 40 million TV sets mean big money money fixing sets. Many open their own full for trained Technicians. More than 4,000 Radio time Radio-TV shops after getting NRI Di- "wrKiQgoLhurIHktiN tA ffESuimnl, l a OytCni mcWI¿iNaeoNl.bC l yII .TtN"loo VN v WdeABo UiI TtLS ITaLI.Nn eIlOdAEe SvHMdSioIs Oi aoF lnl. aaayobnneulddate raiTTsmb-VVoNpu obstRre rtNtoaIsa n,R dhtH Ica.pias -o sSFbtsiiiienn,t eicgoane sn sss1ttur.a9 art1Ceii4on of -nilunofstgro u otrraefe fml meegrvbr oioiirstnweiioot tetnuhhr,s.e a psFnmto iinnr4etdg0n- pLmtAileedoessdnms rtoi eanns.s su:MpaR npNaAlddAi IeiToLd6 I-, 4O T C-opVNOuaA.gt UlLeiPnP rReOiCcsA NeaDo t.afI iO lsGoc goIelNu ot rwSssFhT e-RostIT,ewE UroiEmTnp gEpsS ,o eaDrqmetuueapisnpplyiet--.. 7EF, Washington 9, D. C. You Learn Servicing -Broadcasting FREE at Home -By Practicing SAMPLE LESSON with Kits N.R.I. Sends AND CATALOG Nothing takes the place of practical experience. That's why NRI training is Learning. National Radio Institute by- Doing. With Servicing Dept. 7EF, Washington 9, D. C. Course you build Radio shown at top and other equipment Mail nie *ample Lesson and 64 -Page Catalog With Communications Course FREE. ,alesman will call. Please write plainly. you build Transmütters at Wt ashnodw ost haellr eeqquuiippmmeenntt . yCoaut aglloegt Name_ Age_ _ _ Available To Address_ VETERANS (' y Zone___State_ - Under G.I. Bills ACCREDITED MEMBER, NATIONAL HOME STUDY COUNCIL MAY, 1057 3 www.americanradiohistory.com MAY, 1957 Radio -Electronics I Formerly RADIO CRAFT Incorporating SHORT WAVE (RAFT TELEVISION NEWS RADIO & TELEVISION' EDITORIAL 33 U. S. Government Needs Inventions -Hugo Gernsback ON THE COVER AUDIO -HIGH FIDELITY 34 Low -Cost Remote Amplifier- Roland Jordan, Jr. 36 Modern Phonograph Cartridges, Part II- Julian Hirsch 38 Enclosure Kits Aid Audio Builders (Cover Feature) -Eric Leslie Typical hi -fi enthusiast Carol 40 Electronic Crossover Amplifier- George L. Augspurger Hughes of New York City 42 Too Well Checked -Monroe Corn prepares to install the 43 The Last Link -Norman Crowhurst speaker in a Cabinart pre- finished enclosure kit. 44 Negative Feedback Controls Selectivity 45 Can Cheap Speakers Be Improved ? -A. L. George 131 New Records WHAT'S NEW Color original by Gary Wagner Studio 47 Pictorial Report of New Developments TEST INSTRUMENTS 48 Two New TV Testers -Robert F. Scott 51 Capacitor Checker- Joseph Cozzo 52 A Scope Switch -Richard Graham RADIO 54 Electronic Texas Towers -Col. Nelson S. Brooks 56 Electronic Crossword Puzzle -Charles Henry VI 57 30 -Mc Transistor Superregen -Edwin Bohr 59 Misleading Heater String -V. F. Woychoski 60 Transistorized Rig Works 10 -Meter Dx- Richard S. Griffith, W7MPQ Hugo Gernsback Editor and Publisher ELECTRONICS M. Harvey Gernsback Editorial Director 62 Light Meter for Electronic Flash -Guy Slaughter Fred Shunaman Managing Editor 78 Electronics Times Traffic Signals -Leo G. Sands Robert F. Scott 81 How Electronics Controls Humidity- Thomas L. Bartholomew ._..W2PWG, Technical Editor 1. Queen TELEVISION Editorial Associate Matthew Mandl 86 Rhomboids for TV Reception -H. W. Kline Television Consultant Elizabeth Stalcup 94 Locating Intermittents -Paul Boller Production Manager 98 Customers We Could Do Without -Art Margolis Angie Pascale Editorial Production 106 TV Service Clinic -Conducted by Jerry Kass Wm. Lyon McLaughlin 11I TVDX- Robert B. Cooper Jr. ....Tech, Illustration Director Sol Ehrlich Art Director 145 Books 113 Patents Lee Robinson Generavotanager 140 Business and People 126 Question Box John J. Lamson 139 Corrections 134 Radio- Electronic Sales Manager 18 Correspondence Circuits G. Aqua Circulation Manager 116 New Devices 143 Technical Literature Adam J. Smith ....Director, Newsstand Sales 8 News Briefs 123 Technicians' News Robert Fallath Promotion Manager 121 New Tubes and 129 Technotes Semiconductors 137 Try This One NEXT MONTH: HOME CONSTRUCTED AUTOMATIC SHUTOFF FOR YOUR RECORD PLAYER EASILY BUILT COLOR SUBCARRIER SIGNAL GENERATOR Associate Member Institute of High Fidelity Mfrs.. Inc. aSfSRotUU rA MBBDoStSI.nO CCe MR-RyEIIoePLPraErTTriC;IsI OO,T $NNRI8l .SOl0.R: 0N ACICfATooSdrpE d,yS rtrew:i MgsohsUa t. yy c,1eo S9ar5.rr1,e7s 9 ;s5 Upb7.$oy, 1n 0SdGV..e5 eon0rlp cn. oesfosb sXrat eocXs tksh RViroePanIeIdus Ii b.o ayl-ine cNEdaarol tes.i. cCo tnar5Ason .nla lPid cIuaonsb,,tc hl. i$eSs4rhuA .0eblc0lds o c rurfiminogptrhotr itinoseot nsnh rele y$Ds5 yee.re0pava0tter .d,: a M $4ut1y7.n4 .e0d a0eMrN r;.o f orU$rWr9i ns.t0ei,wv 0sleo eIr lyfsloy. a.rel A,a trvbwsIey;no. ,t eG$yD9reen.i0rtaan.0r ts sibMo;f aonoc$ra k1rlr2t ih.sa0Pr,n0 eu edIb flollyiP.cr , a aanttorhi so-rr ;Ane 1esms5 ,i4 ney grIeiWlncaecar es.n sc. to SpCe1ioec4psot hyn 3rdi5-Sgc cht,.l ta, .P< CsaN onen wn-v Aa eimnYlt oeiorrpkinrc isav.1 ni1l e, gceoNsu. natYruie.t hs oW$ri4hz.ee5nd0 requesting a change of address, please furnish an address label from a recent issue. Allow one month for change of address. GChEaRirNmSaBnA oCf Kth eP UIlBoaLrIdC;A MT.I OHNaSrv. eyIN GCe. rnEsbxaeccku,t ivPer eEsiddietonrti;a lG .a nAdl ipuAod,v eSrteiscirnegta ryO.f fices, 154 West 14th St., New York 11. N. Y. Telephone Algonquin 5 -7755. Hugo Gernsback. BRANCH ADVERTISING OFFICES and FOREIGN AGENTS listed on page 149. POSTMASTER: If undeliverable, send Form 3578 to: RADIO -ELECTRONICS, 154 West 14th St., New York 11. N. Y. 'Trademark registered U. S. Pat. Office. 4 RADIO -ELECTRONICS www.americanradiohistory.com L RADIO -ELECTRONICS LEARN ALL 8 PHASES OF THE INDUSTRY BY SHOP METHOD HOME TRAINING 1. Television ... 5. Sound Recording including Color TV & Hi- Fidelity ... 2. Radio AM, FM 6. Automation 3. Industrial Electronics 7. FCC License Preparation 4. Communications 8. Radar & Micro Waves Let National Schools of Los Angeles, a Practical Resident Technical School for over 50 years, train you at home by ' Shop- Method for unlimited opportunities in All phases of TV, Electronics, Radio. You get 19 big kits of equipment! You GET EVERYTHING YOU NEED ... Clear, profusely illustrated lessons, shop - GOOD JO.B.S. MORE MONEY tpersatecdti cmala njuoabl s,p rmojoedcetrsn - aclilr cuthite dviaalguraamblse, Al LDS ANGELES TRAINING SvYciiEsaOinCoUsnU -a aRErreleIeT cYnitnre oendgiercodsw iiinAnn gdLth uLesd terCgmyr.Aea anNTtd r,ma BiaEnoted deYe rxOntce eUTclhelRelnenSi--t etwpNeqliEroutihEayi plDmsmo eueafnronn trdt q oSuussaehtelsroirvtfvwaiiienccndede si. an s-bEtgao Vcfsvfou,eE cn c-asRmenusYdlsat aTnGitniHyo r anIENd oluetpGhcarttei revroY inlOEemicgmUase-.- lSsi ctRahYErootSou IlDN wOEaiWNts hT SL titonous d toiaoAuksrn e. g eyYHl oeuesr,r e mt trhoapYedir noeouirfw nneg so sriilond nsao luTwlryV i Rthcien asspiltdaiatetlaelnelstb,d ty pbroMeafrs oeyetta,hah dreocci dnhaf s,i eTtsailrdnana.lgd ei,n sN m inataaetgninl,ode yn cw oaasitlsth ethireSn vrcngi hcei,me ow,o cpllyosom mraMtadamnndauutesf ntdaebi crcrl taaeunStsricshioohnonnegpsss ,-, YIWONIDULUL SLTTRREYAA INRN NEEYN DOOBSU Y.O Y BSOSLEUINHG.D AO NTFPAIOO TRINMO .N FEAALTC THSS OCTHDOO DOALSY . REaaia¡nln0tdet1 yiec1o ffnt-siriTnctowniVhdeonhos iinnticol.,g el . e mGhqyouroroamauispnd teme ul aaeccenntaooneeer mft na ri.rpe E lnmeCsdtchpelhye loo cfyoikanml csbeitlroniuxtt-i c eatSsionne rd rs ov.c ipPo Pcuaeeprt ro snot inmfaoelr and equipment prepares you in your spare you do servicing, circuit analysis, and do cull information. time right in your own home for these fasci- over 100 down -to -earth experiments. You nating opportunities. OUR OUTSTAND- build a Superhet Receiver and a modern TV Approved for ING METHOD IS PROVED BY THE Receiver, from the ground up, including a GI Training ;- SUCCESS OF GRADUATES ALL OVER new, big screen picture tube. You also re- THE WORLD! ceive a professional, factory -made MULTI - NATIONAL SCHOOLS TESTER. All o.f ..th is standard equipment is YOUR TRAINING IS ALL INCLUSIVE yours to keep at just one low tuition. LOS ANGELES 37. CALIF. We prepare you for a long list of job opportunities. Thousands of TV and Radio receivers are being sold every day -more NATIONAL SCHOOLS than ever before. And, now, Color TV is FREE! here. Applications of Electronics in industry TECHNICAL TRADE TRAINING SINCE 1905 -AUTOMATION -are growing in tre-- gV ASLA NP LE LESSON LOS ANGELES 37, CALIFORNIA mendous strides. The whole field is alive _dust Send I GET FAST SERVICE -MAIL NOW TO opening up new, important jobs rapidly. Coupon! NATIONAL SCHOOLS. DEPT. RG- 57 I National Schools complete training program 4000 S. FIGUEROA ST. I qualifies you in all phases of the industry. ILOS ANGELES 37, CALIF. Rush free TV -Radio "Opportunity" Book and sample I YOU EARN WHILE YOB LEARN lesson. No salesman will call. - I Many stu-d ents pay for their entire training I NAME ACE ii and more with spare time earning. We'll show ADDRESS you how you can, too! Early in your course you CITY ZONE STATE receive material that shows you how to earn extra money servicing TV and Radio receivers, oVE OCEhPeAcNk ,Sil, Gi le do'. CIN LDY " sInh oR.geseid ent Scheel ,ninm` et los Angeles appliances, etc., for friends and acquaintances. MAY, 1957 5 www.americanradiohistory.com INTRODUCING BOGEN FLEX-PAK® custom flexibility in packaged PA ... ... portable or permanent make more sales, more profits HOW'S THIS FOR EASY SERVICE ...EASY INSTALLATION Meet Bogen's Flex -Pak public address line. at practically every popular wattage. Get Here's true portability. Here's easy servic- in touch with your Bogen representative or ing. And here's all the flexibility, perform- write for all Flex -Pak specifications and ance and dependability you'll need to satisfy prices. NOTE: We also supply famous - - 90% of your commercial applications make indoor and outdoor speakers, micro- without going to the additional effort and phones and other accessories for all your delay of expensive custom designs. You can Bogen public address system installations. offer Flex -Pak systems in every price range, Mail coupon now for the exciting details. Loosen 4 thumbscrews and the flaids'ts soefrfv ifcoinr ge. asy access and Two of 12 New Amplifiers In The Exciting Flex -Pak PA Line with accessory Folds back when not in use in Manual Phono emaosyu n-stl ibdriancgk eat.c cessory wall - Deluxe LX30 30 -Watt Amplifier 4o neM imcriocprohpohnoen eI ncphuatnsn e(l pafnoer l pshwonitoc ho rc otnuvneerrt)s, Superb L330 30 -Watt Amplifier Built -In Remote Gain -Control Circuit, Exclusive 3 Microphone Inputs (panel switch converts one Anti - Feedback Control, Speech Filters, Sepa- microphone channel for phono or tuner), Speech rate Bass and Treble Tone Controls Filters, Separate Bass and Treble Tone Controls Size: H. 5'á ", TV. 16% ", D. 13 ", Wgt.: 25 lbs. Size: H. 5% ", W. 14 % ", D. 13 ", Wgt.: 24 lbs. MAIL THIS COUPON TODAY FOR DESCRIPTIVE BROCHURES AND PRICES 4 Thumbscrews attach acces- sory record player mount. Dept.NQ,David Bogen Co., Inc., P. 0. Box 500, Paramus, N. J. (Note: "cooling area" pro- Gentlemen: Please send me descriptive literature and price tects phono mechanism.) information on your BOGEN FLEX -PAK public address equipment. noesa NAMF FIRM check one dealer jobber sound specialist î G ADDRESS PUBLIC ADDRESS SYSTEMS CITY ZONE STATE A ONITRONICS CORPORATION AFFILIAIL Write -in on each gain control PKlenaoswe sAenbodu mt eS o2u4 n-pda gSey,s tiellmusst.r"a ted brochure, "What You Should ptarkeveesn tisn evmolbuamrrea sssientgt inmgiss-. HPilgeha sFe idseenlidt ym,"e byyo uLr. H56. -Bpaoggee,n iallnuds tLra. teBdia nbcooolkl,i . "(UI nednecrlostsaen 2d5icn.g) (Easy to erase markings.) 6 RADIO-ELECTRONICS www.americanradiohistory.com "If You Want to Make More Money Full or Part Time in TELEVISION RADIO ELECTRONICS DeVry Tech Has An Answer," Jack Dempsey SAYS JACK DEMPSEY The former world's heavyweiight boxing champion says: "I know the vadue of good training, and believe me, for 25 years, - O.Vry hos been one of Amerka's out- standing electronics training casters! The NO TECHNICAL EXPERIENCE NEEDED Employment Service is 'tops' tool" YOU CAN LEARN IN YOUR OWN HOME! THESE DEVRY TECH GRADUATES VERIFY Great opportunities are found in Electronics --o ne of today's WHAT DEMPSEY SAYS top fields. Good jobs in modern plants, TV Radio studios, offices and laboratories await trained men who can build, install, operate and service Electronic equipment. And equally NICK BARTON, Illinois, a !DeVry exciting are the possibilities for starting your own -s ervicing graduate, hew has shop. The coupon below will bring you full details Free! his own business HERE'S HOW TO GET STARTED! and tells us he is You can get Television- Radio -Electronics training right in your EARN AS YOU LEARN -by sere "literally snowed own home. You don't need previous technical experience, icing radio and TV sets at home with work." advanced education, or exceptional "aptitude." And the before you complete the training. training DeVry Tech provides is "tops." What's more, DeVry GEORGE D. helps you get started toward a job, or a servicing shop of CROUCH, Califor- your own! nia, was a retail TOO GOOD TO BE TRUE? store clerk. He took Not at all! Our files show that many men -high school grad- the DeVry program, uates, truck drivers, store clerks, unskilled workers -now have and today is in bus- the better jobs they- wanted because of the-ir DeVry diplomas. iness for himself. Age is no barrier DeVry trains men 17 55. - EDWARD HAHN, TWOC HGIRCEAAGTO T aRnAdI NTINOGR OCNETNOT ERS LIloCIVbEE o--Wp pIpRouErts tuE nyMiotPiueL sOin -Y vMtoeEuNncTh hSweElipRthsV - Itlrloinnoiicss. Nteowch annic iealenc - If you can c-om e to either of DeVry's training centers- Chicago yyoouu r eoswtanb.l ish a service shop of with Televiso, Inc. or Toronto you can prepare under the close guidance of DeVry Tech training friendly, experienced instructors. You can use valuable equip- helped him prepare ment similar to that found in the field. Write today for com- for his present posi- plete information. tion. ARE YOU OF A SAMPLE LESSON IS YOURS DRAFT AGE? 0 Srgbeeoivaeoel kf oloeyprt op,y uoo" rEutaulr esnfceirtteilrefoe shn oiccinows p EayDln eedcoV tfrY roayOnn iUtc rs ian itnWe: reye'olsl uta inlfsogor I tamWiogieenli ;t hafsaorovyr e ief s vveyeaorvrluyui c aaembr,e lae bn sei uno bfsfo juerdrmcert a ottfoo-t mBatesUosstnIe LeemDqy b uTlsieEpe SmyrTvoe iuEcnriQt n otgUow IPRnhM eahldEpiig oNhy To aq un-u dYea aolTirtVuny check the coupon. sets in your spare lime. "Ore of America's Foremost Electronics Training Centers" MAIL TODAY FOR FREE FACTS DeVry Technical Institute iy i I NaAtiocncrael dHitoemd eM Setmudbye rC oouf ncil 4141 Belmont Ave.. Chicago 41, III., Dept. RE -5 -N ile lt o PYlOeaUs.e" give me a FREE Sample Lesson and your booklet, "Electronics and I I i tqlN1;11;!tiïl' ; I!INÌ InIF . @IIi 3--` Al l Name Please Print Age DEVRY TECHNICAL INSTITUTE Street Apt CHICAGO e-1, ILLINOIS City... Zone State FOLMERLY Check here if subject to military training. DEFOREST'S TRAINING, INC. 1080 DeVry's Canadian Training Center is located at 580 Roselawn Avenue, Toronto 12, Ontario MAY, 19 57 7 www.americanradiohistory.com "''Blue Chip Views Quality ek Briefs TACAN DATA LINK, latest contri- the ground controller to indicate on the bution to air safety, may be a major instruments in the plane what speed, step to an air -traffic control system able height, rate of descent and direction to to handle not only present high -speed fly. aircraft but also the coming traffic problems of the jet age. Tacan and its commercial counterpart RADIATION INTERFERENCE by TV Vortac give the pilot accurate informa- receivers above 260 me will now have tion on his bearing and distance from to meet FCC requirements on all uhf the station, but do not solve the prob- TV chassis placed in production by lems faced by the ground controller at June 30, 1957, and all TV receivers ITS Tung -Sol aepa nxladabnc uets hsy- ep aaodassiiin rtpigwoo -enral tl .to a fs H theath e esliahrsr oagmauell edti tnutukidmnmeoe,bw ,e s rp aetnheodedf cmrooevpamenrrpe utlsfhieaaennc tctosue r riegdawi n iaath6lf t-demarr oeteDngstue hclt .ah te3ipo 1oFn, sCst1 pC9o5l ni7sme.e mtiT teifhnonigtsr the radiation of TV receivers. After be able to give directions to them almost simultaneously. the new dates, all receivers will require Added to the Vortac or Tacan sys- certification that their radiation does not exceed the legal limits. tem, the Data Link originates informa- tion which rides "piggyback" on the Postponement was requested by Tacan transmission. Henri G. Bu- Rtuardeiros - EAlsescotrcoiantiicosn-. T elevision Manufac- signies, president of Federal Commu- nications Laboratories, in a recent in- troduction of the equipment, explained TRANS- ATLANTIC SCATTER plan that these transmissions can supply full of an ionospheric scatter system for data on identification, speed, course, fixed trans -Atlantic communications altitude and position every 6 seconds. was adopted in Montreal, Canada. The ground station can issue instruc- The Council of the International Civil tions covering all these by simply press- Aviation Organization approved a pro- ing buttons which cause the orders posal by the United States to form a to appear on the face of the correspond- forward propagation system between ing meters in the aircraft. In addition, Canada, Iceland, Greenland, Ireland a "library" of 31 messages can be and England. (See "Over- the -Horizon Tung -Sol receiving tubes for TV, radio transmitted and, due to the nature of Radio Presages World Television," atihnnedd e spaHemin -edF iea ns rt tehspoeltsa ecm esamukpeepnrslti. edaT hrteios olenexaead cfitinnlgye tpphlraeeTn sheeeeq n utiD nip aVmtthaoee nr Ltta,li acntn khg oeucrya a ngwT eiea lacl osaifanl py t phsseeyua sprtp peiilmnleo mste. a ecbnhyt pRboeAiTtDnwhItOe i-s et- oEn L s-ApyEoCsltaiTensRmtk Oca No wamICnimSdll, uthbnSeeiec pAasttileimeomunibtlsia eahrrn a, svt o1ew 9bh5tehe6era.n)et quality is your assurance of long, adding a few pieces of equipment and established with Collins transmitters. trouble -free service that keeps cus- installing meters modified to show or- What type of equipment will be used tomers with you year after year. Tell ders and include pickups for informa- for the North Atlantic system has not your supplier you'd rather have tion to be transmitted. been decided. The new system is to be Tung -Sol Tubes. TUNG -SOL ELECTRIC The Tacan Data Link airborne equip- built at an estimated cost of $5 million INC., Newark 4, N. J. ment provides a system that permits (Continued on page 12) OTUNGSOL MAGIC MIRROR ALUMINIZED PICTURE TUBES RECEIVING TUBES Miniature Seated Beam Signal Radio and Lamps Headlamps Flashers TV Tubes aras s RED ATc HOLDING Tacan Data Link airborne equipment displa-y. ROGER PROCEEDINr Aluminized Special Sen conductor Mlatetteerr sb yi nsdeiccoanted saectt uoafl naunmd boerrds eorer dw ecdogned-i tsihoanpse d oeOITING Gas Low' Picture Tubes Purpose Tubes Products indicator at dial edge. Right meter is mode LANDING RADIO pill (type of ground control) and message indicator. 8 Lower instruments are channel and (air -to- ground) message selector. www.americanradiohistory.com ALLI D'S E 1957 ALLIED RADIO 100 N. WESTERN AVENUE CHICAGO 110,11.l. TtI.phose lyymerko 1 -6800. value -packed 356 -page 01/4 30114 Ta 0y CATALOG CATALOG NO 160 ¡NI 1Ati3tt 1P4 A5AW1 114111 1957 EON the only COMPLETE catalog for everything in electronics OJeticti Matt Compeztgtula, FEATUR NG I Latest Hi -Fi Systems and Components SUPER -VALUE knight -kits Super -Value KNIGHT -KITS The very finest electronic equipment P.A. Systems & Accessories Recorders & in money- saving kit form -Test In- struments, Hi -Fi Kits, Ham Kits, Supplies TV Tubes, Antennas, Accessories Hobbyist Kits. Easiest to build and Amateur Receivers, Transmitters, you SAVE MORE! Station Gear Test and Lab Instruments Specialized Industrial Electronic EVERYTHING IN HI -FI: Equipment Huge Listings of Parts, Tubes, World's largest selection of quality ... Transistors, Tools and Books Hi -Fi components and complete music systems. MORE PEOPLE BUY THEIR -it's HI -FI FROM ALLIED THAN ANYWHERE Get ALLIED'S 1957 Catalog complete, ELSE IN THE WORLD up -to- date -356 pages packed with the world's largest selection of quality elec- EASY -PAY TERMS: tronic equipment at lowest, money- saving prices. Get every buying advantage at Opanyly. 1A0v%ai ladbolwe n,o nu po trod e1r8s movoenrt h$s 4t5o. ALLIED: fastest shipment, expert personal Fast handling -no red tape. help, lowest prices and guaranteed - - - satisfaction . . . tts 1t ttta tam t1IM =11 send for the leading electronic supply guide ALLIED RADIO CORP., Dept. 2 -E -7 100 N. Western Ave., Chicago 80, III. (] Send FREE 356 -Page 1957 ALLIED Catalog i Name un. 36-ax. 1 ALLIED RADIO 1 Address J - - - City Zone State fa t. o- - . to World's Largest Electronic Supply House ttta t1111 SIM MAY, 1957 9 www.americanradiohistory.com the best color TV picture AR-22 the g rowth of I olor TV means an even greater demand for CDR Rotors for pin -point accuracy of antenna direction. 2 ab etter picture on more stations CDR Rotors ach to the pleasure of TV viewing because they ine up th( antenna perfectly with the transmitted ... TV si gnal givir g a BETTER picture and making it possi Ste to brir g in MORE stations. a tested and proven dependable 3 ff thousands and thousands of CDR Rotors have proven their dependability over years of unfailing performance II'tIffcfffffl;fffffr:,fff ir; el in installations everywhere in the nation. Quality , 1Cj1[1111 and engineering you know you can count on. TR and 12 11 4 pre -sold to your customers the greatest coverage and concentration of full minute spot announcements on leading TV stations is ... working for YOU pre- selling your customers. 5 the complete line a model for every need ... for every application. CDR Rotors make it possible for you to give your customer exactly ... what is needed the right CDR Rotor for the right job. AR and 2 1 SOUTH PLAINFIELD. N J CLEVELAND 13. OHIO 10 RADIO -ELECTRONICS www.americanradiohistory.com

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Tube Data Chart and think - For a Successful in Radio. Career. -Television. Train at Home in Spare Time with N. R. I. Amateur Receivers, Transmitters,.
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