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Bad I1 G' C1[Af \/)(I HUGO GERNSBACK. Editor formerly BAD I1 G' C1[AF \/)(I 44, M, ELECTRONICS -TELEVISN www.americanradiohistory.com PROJECTION TELEVISION IN ASSEMBLY FORM COMPLETE WITH RACK 20 "x26" PICTURE 36 RCA TUBES EASTMAN KODAK PRO- JECTION SCREEN f 1.9 BAUSCH & LOMB PROJECTION LENS 30 KV FLY -BACK POWER SUPPLY ANTENNA PICTURE & SOUND I.F. FACTORY WIRED G TUNED DUMONT INPUTUNER For realism, clarity, definition and TERMINAL HAS BIGGEST STOCK of BIG SCREEN Televiewing, the pictures BEST BUYS IN TELEVISION KITS, produced by this unit hove no equal' PARTS and ACCESSORIES! This TELEVISION ASSEMBLY KITS, com- screen is absolutely flat, pre- plete with all parts, tubes,. etc. with cluding curvature distortion anywhere factory wired and tuned R.F. and I.F. in the picture. Picture tones ore true sections. block, grey and white -high in bril- TA -10, 10" Model, net 229.50 liance, yet obsolutely glare -free! TA -12, 12" Model, net 259.50 TA -15, 15" Model, net Easy to assemble! Everything is sup- 349.50 plied, including prewired high voltage CHAMPION Models, some os above power supply, Dumont Inputuner, but with famous Dumont Inputuner. wired and pretuned 13 tube I.F. strip 10" Champion, net 273.10 for picture and sound, precision 12" Champion, net Bausch and Lomb f 1.9 projection 303.10 lens, Eastman Kodak projection screen, 15" Champion, net 393.10 mirror, 36 RCA tubes including 5TP4 DUMONT INPUTUNER-R.F. section projection tube, special dipole with which tunes continuously from 44 to WOOD -SIMULATED METAL reflector and 60 ft. coaxial lead -in, 216 Mc., complete with tubes and 12" heavy ENCLOSURE FOR ABOVE KIT duty RCA PM speaker, dial 58.65 push -pull 12 watts AT audio, rock and AVAILABLE picture frame os illustrated, Picture and Sound I.F. Strip- factory oll ports, wired SLIGHT E %TR. I (OsT wire, hardware, etc. Big to and aligned. With 13 matched easy- -fol- RCA tubes, your cost low manual of instructions qnd sche- 77.25 VISIT OUR TELEVISION DE- matic data prepared and edited by SARKES- TARZIAN -New 13 channel renowned John F. Rider, Publisher. R.F. tuner, complete with tubes 31.75 PARTMENT. SEE AND HEAR RCA -popular 13 channel R.F front The list price of the P -520 kit is only end, complete with tubes 44.10 ASSEMBLED TELEVISION KITS $1299.00, with adequate margins for Bausch G Lomb Television Projection IN OPERATION. Television Service -Dealers. Write us Lens, f 1.9, with mounting ring, for today for FREE! Write today for our Big, New special dealer price! use with 5TP4 tube. Net price 135.00 TELEVISION Kits & Ports CATALOG! TERMINAL RADIO CORP. 85 CORTLANDT STREET NEW YORK 7, N. Y. Phone: WOrth 4 -3311 Cable Address: TERMRADIO www.americanradiohistory.com :1 hiRN RADIO IN SPARE TIME As part of my Course I send you the speaker, tubes, chassie, transformer, loop antenna, etc., to build this modern, powerful rpRACT/C/NO- Radio Receiver! In addition, I send ou parts to build many s= other real Radio circuits, like the Signal Generator, Radio Tester and Superheterodyne Receiver pictured below. You use this material to get practical Radio and - make EXTRAQtmoney fxing neighbors' Radios in spare time. Mail coupon below forire. Mlete information ! 1/ F I I SEND YOU BIG KITS OF PARTS You Build and Experiment Wich this MODERN RADIO AND MANY OTHER CIRCUITS Do you want a giant-Pay Job iii LLB Future for I ralead Mee is Bright fast- growing Radio Industry -or your In Radio, Teler'lsi., Elechonics money -making Radio Shop? My own It probabh easier to F' >larit-J train -at -home method has helped hun- Radio now than es er before, because dreds of men with no precious expe- Radio Repair Business is iss,miog. Trap rience become qualified Radio Tech- Radio Technicians also and profitable m Mail Coupon and you'll get port unities in l'nl We, Aviation, Marine nicians. the Broadcasting, k. Think a Sample Lesson and my 64 -page book, ub1r work. d of eve,, "How to Be a Success in RADIO -Tele- greater opport nnit ies as public demand vision -Electronics," both FREE. See for Television. FYI, Elect node desires con- how you get practical Radio experience tinues to grow. Cut the farts on all these J. E. SMITH. President at home, building, testing Radio cir- opportunities. Send for FItli' books now. National Radio Institute cuits with 1í1G KITS OF PARTS I send! FM at Mat Nil Ca Dg Fer Yoe Sample "Get- May Winn Sou lid. EXTRA Mary Mail Coupon for Lesson, I TRAINED THESE MEN ting .ttrinainted With Itreeiler ert icing I Spn T.. MMRe Lomeli and my FREE 54-page It's packed 'a k Rakes fH A 's for 'file da, you enroll 1 start sending with facts about opportunities \ Nut Plis fuis EXTRA MONEY manuals. You learn n. Read the details about my Course. alrfig "I am Radio Rail in principles fro In my s-to- under had letters from men I trained. telling 41 ha.' Serviceman stand. illustrated lessons- I'R.\t'TI I'E what what they are doing, earning. See how eia on learn with parts I end -USE your quickie-, easily ton can for The knmHelge to make EXTRAs get starter!. o o Adams Ap- money fixing neighbors' Radios ligation. Just MAIL pliance Co. in spare time while still learn- COI'PoN NOV,' in an .. Am now ing: From here it's a short step envelope or paste 't get- on a penny postal. ting Ito a to ,enr i 'n fall-time Radio Shop or ttgood Radio joh! I. E. SMITH, Pres., Dept. eitX .s bonus and over - National Radio Institute. 1,onear. Bono tuu, W. A. ANGEL, Blytheaville, Arkansas. Stade Radio S,1w01. Washington 9. D. C Kiss MON( Meet .elle " I k n e w VETERANS n o t h i n g about Radio I en- when MR. J. E SMITH, President, Dept. $KX rolled. I am doing spare National Radio Institute, Washington 9, D. C. time work. I nie Lesson and 64 -page book. (Ni. have more than paid for Mail FREE Sample my Course and about salesman will call. Please write plainly.) $200 worth of equip- Age ment." - RAYMOND HOLTCAMP, Vandalia, Name.. -._ Illinois. Address........ My Course Includes in Training City Zone State TELEVISION ELECTRONICS Check if Veteran FREQUENCY MODULATION www.americanradiohistory.com 4 Hugo Gernsback, Editor -in -Chief RADIO Fred Shunaman, Managing Editor M. Harvey Gernsback, Consulting Editor ELECTRONICS Robert F. Scott, W2PWG, Technical Editor formerly RADIO -CRAFT R. H. Dorf, W2QMI, Associate Editor I. Queen, W2OUX, Editorial Associate In corporaleng Angie Pascale, Production Manager SHORT WAVE CRAFT TELEVISION NEWS Elmer Fuller, Shortwave Editor RADIO t TELEVISION Wm. Lyon McLaughlin, <Trme,nurk n-giniere,l Il. S. Patent Ocoee Tech, Illustration Director G. Aliquo, Circulation Manager Special Audio -Sound Number John J. Lamson, Advertising Director Alfred Stern, Promotion Manager Contents October 1948 Editorial (Page 21) Radio -Craft Becomes Radio- Electronics by Hugo Gernsback 21 DY.TV 40MF-450WVo Audio (Pages 22 -55) 40 MF -450 WV ° Ultra Loud Speaker Is Auto -Truck Size by Paul H. Thomsen 22 ' 85'C Modern NADE IN Microphones 25 USA. Interesting Amplifiers 26 Modern Crystal Phono Pickups Y9 Microgroove Phonograph Records by M. Harvey Gernsback 30 Electronic Organ Improved with FM by William K. Allan 32 New Trends in Loud Speakers 34 Four -Watt Portable for All- Around Use by Lyman E. Greenlee 36 A Synthetic Bass Note Circuit 37 Packaging and Unitizing Audio Equipment by Eric Leslie 38 A Sonic Analyzer (Cover Feature) 40 Radio Set and Service Review (Amplifier Co. of Americo Model 810) 42 Frequency Test Records by Richard H. Dorf 46 Phase Inversion Headaches by James R. Langharn 50 Calibrating Audio Oscillators by Richard D. Henry 52 New Magnetic Pickups by I. Queen 55 Television (Pages 60 -64) Cascode Preamp Reduces TV "Snow" by I. Queen 60 Television Sweep Circuits by Allan Lytel 62 Electronics (Pages 68-72) The Crystal Detector, Part IV by Jordan McQuay 68 Construction (Pages 75 -77) Binaural Ampiifier by Edwin Bohr 75 Foreign News (Pages 78 -80) European Report This year -the same as every year by Major Ralph W. Hallows 78 -Solar is first to give television Departments sen -ice men the most neededdevel- The Radio Month 10 Try This One 86 opments in electrolytic capacitors. Radio Business 16 Miscellany 87 New Devices 56 New Patents Keeping pace with the fast -mov- People 74 88 World -Wide Station List ing television Question Boa industry, SOLAR'S 81 by Elmer R. Fuller 90 Technotes 63 new Type DY -TV series dry elec- Communications 93 Radio- Electronic Circuits 84 Book Reviews 95 trolytic capacitors assure depend- able operation under the severest RADIO -ELECTRONICS, October, 1948, Volume XX. demands of modern television issue by No. I. l'uldisind niontlily the 25th Of month ... Itadcraft Publications. loc.. preceding date of Eric \te.. F to G Streets. Philadelphia 32, l'a. Entered matter at Piet ()film, Springfield, SIass., under Art as second class permit high temperature delphia, Pa., Post of March 3, 1579. Application pending transfer opera- OM!, SUBSCRIPTION RATES: III 1'. S. to the Phila- Central American countries, and Canada, in U. S. possessions, Mexico. Foch and $3.511: 48.00 for two years: pg.m: for three years, tion with no sacrifice in long life countries $4.50 a year, $5.110 for single copies 30e. All other foreign two years. $11.00 for throe years- Allow one Ordering a change, please furnish an month for change of address. When address stencil impression trout a recent wrapper.
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