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Radio' S, Greatest Magazine ÿ. OVER ,2b IL_i'STRA-HCNS r' ... 744:74, 81; HUGO GERNSBACK, Editor wG S:.6TwS EC ,ó..',; 1`'1 .wVLIFIEF N6w5 ,--- CUT 20 1000 2000 PER SE CO% C 5` o-mo7- / SOD .o I 5! w5 waDS wOFD t5O,V ówi I[.C.1 -VN115E INVERTER CIRCUIT - STUDIO 8 Dw.s $TUOIO row.¡ MIR[ RADIO DETECTIVE HOW TO BUILD A SKI BROADCAST P. A.- RADIO- RECORDING SYSTEM See Page 652 RADIO' S, GREATEST MAGAZINE RECORD PLAYERS RECORDING- PLAYBACK AMPLIFIER DISTOR 1!O; IN A. F. AMPLIFIERS ULTRA -MOBILE P. A. SYSTEM WIRELESS "P. A." SAYS EVAN R. RUSHING, SOUND ENGINEER, HOTEL NEW YORKER AMPERITE P. G. DYNAMIC BRINGS STUDIO QUALITY TO ORDINARY P. A. JOBS UNI -DIRECTIONAL. NEW SUPERIOR ELIPSOID PICKUP PATTERN ELIMINATES FEEDBACK TROUBLE BECAUSE IT HAS LOWEST FEEDBACK POINT OF ALL DIAPHRAGM TYPE MICROPHONES FLAT RESPONSE. FREE FROM ANNOYING PEAKS. GIVING REPRODUCTION. ItSrONSt STUDIO -QUALITY Or t. prNAU1C The P.G. diaphragm follows air particle velocity where amplitude is a GRADIENT of the PRESSURE. 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National Radio Institute ON DILL- I'M SO OUR OYER. is a catalog of common Radio receiver Beginners Quickly Learn to Earn Established 25 years GLAD I ASKED YOU I HAVE A GOOD JOB causes and remedies. 'ro FIX OUR RADIO. NOW, AND THERE'S A troubles, their S5 to Sb0 a Week in Spare Time He has directed the train- Learn how practical IT GOT YOU STARTED BIG FUTURE AHEAD Mail the coupon. Find out hose N. R. I. trains u to make ing of more men for the N. R. I.'s 50.50 method makes learning extra quickly. Many N. a. 1. students THINKING ABOUT FOR us IN the many report a in spare time Radio Industry than any- Radio at home. Discover within a feto months. Many pay for their one RADIO AS A CAREER. RADIO money made in else ornortunities the N. R. I. Course opens entire Course with extra AND YOU'RE well time jobs. spare time while learning. NOW for -paying full GOING AHEAD Why Many Radio Technicians 00 FAST Make $30, $40, $50 a Week You Millions of dollars in defense orders on top a record year for Radio are opening new Get This oppurts for Radio Professional well paid because they use Ttheir t tinti, as well as their hands. It takes both Servicing O repair a home or auto Radio set: to oper- to and maintain a Broadcast or Commercial Instrument ransntltting station: to Install. operate and epair Pollee. Anal toit. Experimental Radio nd Television equipment. That's teby so This instrument makes practically any test tang fellows who iserane Radio Technicians called your are able to jump their pay; why others op- Radio work rh sucre ante and fulll I. E. SMITH. President. Dept. IEX rn full time Radio Service Jobs.etItn tsehenused on the test bench. or National Radio Institute, Washington, D. C. rate their long ea Businesses. Many fix Radios in spare time A.C. and D.C. voltages and currents: tests Dear Mr. Smith Mail me FREE, without obligation, your Sample Lesson - 1 t e.. h ltl I. d ill t r fI uni t: I. page bade "Rich Rewords In Radio" which telle about Ifadiú s spare aligning ea set. old or new. l'ou get this and full tune opportunities and explains your 50 -50 met hay of train instrument tas part of y re N. R. I. Courte. ing men at home to be Radio Technicians. (No salesman will call. Write Plainly.) DRAFT REGISTRANTS! Mall the Coupon Hundreds Of m who knots Radio when Get our SA51pt.E t.E..SSON d a envy of Age they military n n' r .dn, .. Rich Rewards In Radio" FREE. a ai,, perialint raying.. in'the Army. lette from menn who o Into Radio this Marine CoD,a. These ratings Nrau.yNavy telling tlido a timed a private's what they wdoing anti earning. You'll sec Name any in addition to carryings extra k why the N. R. I. Course is easy to stud, and rest,ee! If ARE NOT called. fascinating to learn. practical to v You'll you are getting into Radio when the get facts on Television and other facpgrow)inir Address Governmentt is pouring millions Into lice branches of Radio. Act NOW. Write onétutop C and address on the coupon below. Post of boom civiliancivilian Radio it rie postntposte-ant tir man it in City State business. Whether you or watt envelope-RIGHTlopeC -RIGHT NON'. for conscription -IT'S SMART TO LEARN President RADIO -NOW! J. E. SMITH. 14X1 Dept. I EX. National Radio Institute Washington. D. C. J RADIO -CRAFT f -,r MAY. 1941 641 NEXT Issue!Use to How Detector Leak HUGO GERNSBACK, Editor- in -Chie/ o Rodio Service Selling Minio N. H. LESSEM THOS. D. PENTZ 'Trans- How }O Stable Associate Editor lrt Director P o mittermitten an Radio R. D. WASHBURNE, Managing Editor Oriental "Theory Coils f and De Re eco{ Contents MAY, 1941 Issue Per Oes4e ?Ottabesn S VOLUME XII NUMBER 11 Mailbag 643 DEPARTMENTS, ETC. Editorial: Radiobotage Hugo Gernsback 649 Mailbag 643 The Radio Month in Review 650 The Radio Month in Review 650 SOUND Sound Engineering-No. 17 ....Conducted by A. C. Shaney 679 RADIO SERVICE DATA SHEETS (See Servicing) . 682, 683 How to Build a Modern 30/ 15 -Watt P.A. - Radio - Recording Console, Part I (cover feature) R. J. Bergemann, Jr. 652 Operating Notes 684. 686 New Circuits in Modern Radio Receivers-No. 44 Measuring Distortion in Audio -Frequency Amplifiers ... ... 656 F. L. Sprayberry 685 Broadcasting 658 "Sayville Once More -an attack on The Electrical Experimenter" 687 How to Make Dynamic Tests on Audio Amplifiers Ted Ladd 660 Latest Radio Apparatus 692 Ultra- Mobile P.A.
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