"550 on Your Dial"!
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THE IRON HORSE GOES ON RECORD! See Page 264 RADIO POSTMISTRESS "550 ON YOUR DIAL"! "PHANTOM RAIDERS" F.M. RADIOS TELEVISION SERVICING PROBLEMS SERVICING 2-TUBE SUPERHET. RECORDING AMPLIFIER ELECTRIFIED NEW S. S. AMERICA'S RADII AMPfRITfJngìuj the B/GGl5790Y901f ía the 4iiwith Júzce iu JnceptlQie !t GRADIENT IJYflhlmic UNI- DIRECTIONAL. NEW SUPERIOR ELIPSOID PICKUP PATTERN ELIMINATES FEEDBACK A TROUBLE BECAUSE IT HAS LOWEST ELIPSOID FEEDBACK POINT PICKUP OF ALL DIAPHRAGM PATTERN TYPE MICROPHONES FLAT RESPONSE. FREE FROM ANNOYING PEAKS, GIVING STUDIO ¡Po moo X0000 -QUALITY REPRODUCTION. FIAT RESPONSE The Of PG DYNAMIC P.G. diaphragm follows air particle velocity where amplitude is a GRADIENT of the PRESSURE. dynamics In ordinary amplitude is restricted from following air par- ticle velocity. J The P.G. DYNAMIC is a radical improvement in this type of microphone. according to modern You can actually hear the difference. Case is acoustic principles. Rugged, not affected by temperature, designed OUTPUT, -55 DB. altitude or humidity. HAS UNUSUALLY HIGH MODEL PGH (PGL. 200 ohms). Excellent for high fidelity P.A. installations, switch. cable connector, 25' cable. broadcast studio, and professional recording. With Chrome finish. LIST $32.00 ( 40. 10000 MODEL PGAH (PGAL. C.P.S. ) 200 ohms). For speech and music. 70 -8000 C.P.S. Switch, cable connector, 12' cable. Chrome. LIST $25.00 IsumoINAIIUN VELOCITY- DYNAMIC AMPERITE ACHIEVED WITH KONTAK MIKE ACOUSTIC COMPENSATOR Puts Musical Instruments Across An exclusive Amperite feature: By mov- ing up the Acoustic Compensator you AMPERITE change the AMPERITE VELOCITY to a DYNAMIC microphone without peaks. At the same time you reduce the back pick- up, making the microphone practically UNI- DIRECTIONAL. k;:11311 So beautiful is the tone produced with the Kontak WITH ACOUSTIC COMPENSATOR: Mike, that it was used in the Philadelphia Symphony MODEL RBHk; RBMk (200 ohms) with to amplify a mandolin solo. Gives excellent results switch, cable connector. with any amplifier, radio sets, and record players. Chrome, LIST $42.00 MODEL SKH (hi -imp) LIST $12.00 MODEL RSHk; RBSk (200 ohms). Switch, KKH, with hand volume control LIST 18.00 cable Plug connector, Acoustic Compensator. extra List 1.50 Chrome or Gunmetal. LIST $32.00 FOOT PEDAL, for making beautiful crescendos LIST 12.00 WRITE FOR FREE SALES AIDS AMPERITE rAMPER/TE561 BROADWAY, N. Y. U.S.A. TRY, MARY, (-BILL, YOU'RE ALWAYS 1LL TAKE IT FOOLING WITH RA01O -- I'LL HOME TONIGHT OUR SET WON'T WORK -- WILL. You FIX IT T, f l V 1 BILL.\ SAY- WHERE IVE BEEN STUDYING RADIO AT HOME, HELLO JOE- N.NHERE'vE YOU DID YOU LEARN +IELLO. BILL- GOT A WITH THE NATIONAL RADIO INSTITUTE. l FIND OUT t TH PRTESTT ITS CANT YOU BEEN LATELY- TD TAKE THEIRCOURSE.. IVE GoT . ,TOUGH ONE OUGHT WRONG A A GOOD ONE WHAT'S AND WHERE 'DID YOU RADIO JOB NOW. LETS MAKE A TO FIX? A GOOD GUESS I'LL MA1<E CIRCUIT DISTURBANCE LET ME LEARN STAGE OF HE AUDIO OUTPUT TOOL HELP YOU / ANYTHING, AND 'TESTING EVERY STAGE MYSELF (I ABOUT It RIGHT BACK TO THE ANTENNA. LISTEN FOR WITH MARY 'RADIO? i THE CLICKS WHEN l V ?qP THE GRID LEADS AVIATION RADIO, POLICE (` THIS THEIR ADS 11 M CONVINCED NOW THAT RA010, TELEVISION, IN THE I VE SEEN r GET A JOB NERFS THE TROUBLEBILL, I IS AND OR CONTROLS - BUT I NEVER THOUGHT COURSE 'PRACTICAL ELECTRONIC FIRST I.F, AMPLIFICATION STAGE. I NOW JWITH A RADIO COULD LEARN RADIO AT \ COMPLETE. l LL ENROLL RADIO IS SURELY GOING THAT TEST EVEN BEFORE BROADCASTING OR LEARNED HOME --I'LL 'PLACES. AND THE I STARTED TAKING THE COURSE, TRANSMITTING IN A MAIL THEIR NATIONAL RADIO amt.. IT'S DESCRIBED AND THEN I CAN MAKE STATION COUPON RIGHT INSTITUTE HAS TRAINED TREE LESSON WtttCH THE REAL MONEY FIXING INSTITUTE AWA HUNDREDS OF MEN NATIONAL RADIO RADIO SETS 1. WHEN r TOR JOBS IN RADIO SENDS YOU YOU MAIL A / COUPON FROM OR INSTALL AvD M 1 1 ¡ ONE OF THEIR ADS LOUD 5?tA .E0. SYSTE$ \ / I -_,lt . ' t.-- // , \ ; n' 15 KNOW THANKS: 11 CERTAINLY \ YOU CStTA.N Y THE A4 EASY TO LEARN RADIO Moro. SOunOS ONLY DAY WAY. l STARTED 0000 AS THE NR.1 AND l'M _1000GNT ITS / A FEW MONTHS ASO, ALREADY MAKING COOP MONEY. Lesson on THIS TIME I will send you a SPARE WORK IS GREAT )J FUN AND T 11 Tips FREE if PRETTY SOON ' Radio Servicing I'LL BE READY IT IS FOR A FULL TO SHOW HOW PRACTICAL TIME J09 TO TRAIN AT HOME FOR GOOD JOBS IN RADIO equipment; ohm, ; J. E. SMITH, President OUR WORRIES ARE OVER. 1 R.Litn I'M SO Clip the coupon and mail it. t. m.lmt eaD.rinvnt;. Muhl National Radio Institute OH BILL- . I HAVE A GOOD JOB 1 in YOU .110 t .. l you t I ; n : ^ : d makes knn ú. I ASKED ' 1 = . years GLAD certain I can train Established 25 NOw, AND THERE'S A to be a Radio 'FecI,- I i i . n 'n,C. taslnatiur,, practical. Fl% OUR RADIO. your spare time Tests esehislr- 'ro FUTURE AHEAD I ' In L..ou a Ih,!: , tl. , BIG that I will send you ,ample ,heile lia 1 It GOT YOU STARTED niclen to :unl , 'frlrl-inn Dlcd.o it. recul it. see ly Tr'..l.,.i. 1 6' FOR US IN lesson free. Examine mc:d.,:: tle :in_, ,, _ t r ,. THINKING ABOUT , i lta how and easy it is understand. In I AS A CAREER, RADIO clear to help RADIO See how my course is Planned AND NOW YOU RE a good job in Italia, a young. TY You get GoING AHEI field scith . fol ore. Y.,. You .-.) or So FAST ne edn't give up your 'Pre,erlt job. Get This to become upend a ot of money Professional Radio Technician. I train you at li. ni' in your spare time. Servicing Jobs Like These Go to Men Instrument Who Know Radio .. Radio hrs., I.,+t , _ T operator- u 1,-,us TI,'- . Met nt Make; PT. I an ds nay' ell. lt, I 1 111,1 npua yIlol, u ' Ploy /asters. nope,;- r , huh 't,..k.tim, ud t. 1, h.iL. toad -Day :ohs ith II It t I,.. , rd , Ih. 1r.t 1 .1 I RA. 11, p t . 1 I : , call, ttment. r .,II 1 President. Dept. OM% I I E. SMITH. t 1 ll N.111 nnl D. C. ploy Intl t tt t tth iv, National Radio Institute. Washington. open their 0, P , Technic; n : I molt band F'ItF:I:. t ithout obligation. our Sample Lesion repair h ,' I t. x ', I I inn V >Ir n ¡Ili: 'fail me .. which tells about I h.,t Renard. in li:uli week. Others hold r: t. I, i, p, ..t a book ''Ruth tsi S5 a k ] 1 .'\Vials to SIP N lt,11't' li,r in eilt call Write l'hiub' 1 . Ia.:., Radio TttimleiIm. iNu sulesm time. AutomnhiI.. t,b' , ' a t t w tu he ril Radio; Inuópraker ssaom.t t.' Get Sample Lesson and 64-page Book Age devices. are newer Dells offer;,. I Free-Mail Coupon tonillos to qualified men .t, i includes Tel eelslnn. nid,h p many good jolts ....in Many Extra Spare Time oWhile Learni The day yon roll, allll. retlllar ewer. I start s ndo: I Money .Ti,o Sheet: star) 'i.., l how to to Rollo rrp.Jr j la- TI 14X -1 1 r SMITH. President MIL rout.» T ad plies. n.I - your Dent. OM X. National Radio Instil,. l inns Ivhlrh h:n'^ tripcI In ., SI. a Week 257 RADIO -CRAFT for NOVGf1RER. 1940 HUGO GERNSBACK, Editor- in- Claief of F.M N. H. LESSEM ABC SERVICE THOS. D. PENTZ RADIO Associate 4 Editor in Director OATA HEETTèstRonge o 25 R. D. WASHBURNE, Making Managing Editor ¡,/peter a/ibratOr NOW t° Tester Modulation Contents NOVEMBER, 1940 FrequencyAmplifier Issue the Minia- Use VOLUME XII NUMBER 5 HoW1Oto ture Tubes Mailbag 259 Editorial: Radio for Defense Hugo Gernsback 263 The Radio Month in Review 264 RADIO DEVELOPMENTS SERVICING Your Job in the Aviation Industry - Staff Sgt. Charles J. Schauers 299 F.M. Servicing Procedure Charles E. Angle 266 S.S. America's Radio New 303 Circuits in Modern Radio Receivers -No. 38 Broadcasting an Aquaplane Race F. L. Sprayberry 268 303 RADIO SERVICE DATA SHEETS: No. 292 -Crosley Model 29BA Radio -Phonograph DEPARTMENTS, ETC. Combination (chassis model 29) Mailbag 270 259 No. 293 -Emerson DX -356 3 -Band Mantel Set The Radio Month in Review (chassis 264 model DX) 272 New Circuits in Modern No. 294 Radio Receivers -No. 38 -Howard Model 520APC Radio - Phono Combination 274 F. L. Sprayberry 268 No. 295 -Mitchell Mfg. Co. "Navigator" Globe -Radio "Miss America 1940" Records (chassis models TW and TWU) Y76 275 Operating Notes RADIO SERVICE DATA SHEETS (See 271 Servicing) 270, 272, 274, 276 Please -Mr. Manufacturer Operating Notes Don Foard, E.E. 275 271 Regarding Standardized Service Charges ... Charles R. Leutz Sound Engineering 11 277 -No. Conducted by A. C. Shaney 278 Television Servicing Problems M. E. Southall 285 F.C.C.'s Mailbag 298 Calculating Impedance at a Given Frequency .... J. D. Weiss 289 Latest Radio Apparatus Servicing Teleceivers 306 292 Classified Radio Directory- Section An Inexpensive Test Speaker 2 311 W. T. Hallowell 302 Shop Notes- Kinks -Circuits 319 SOUND Book Reviews 269, 302, 320 Sound Engineering -No. 11 Conducted by A. C. Shaney 278 Recording - Playback Amplifier as Direct -Coupled Output Published by Radcraft Publications, Inc.