5/8 TUBES! - rsp-italy.it

1 OVER 125 ILLUSTRATIONS A WEATHER ROBOT 5/8 -110LT TUBES! MIKE TESTING OD SERVICE SHOP MINIATURE-TUBE AUDIO AMPLIFIER NEW MINIATURE PORTABLES THE GROUND & INTERFERENCE FULCIIRONOGRAPH! Order your copy NOW the only P. A. HANDBOOK ONLY 25 CENTS A COPY MOST COMPLETE AND AUT+ ENTIC BOOK PUBLISHED THAT no book has yet been published whirl covers toamL amplifiers end d systems (also kindred Sys in One mplet., authentic volume is almost Dellevehle. Yet. It IS fart. there in no hook in print hick a Public. Address from A to Z. To bridge this covers gap. RADIO -CRAFT ill publish complete, magnificent volume on Public Adams a such magnitude -no complete and nthorun, live -that every engaged in radio ran have both theoretical and practical knowledge of the function and operation of sound 22222 ms.)

2 The editorial page. filled with instruction and ie with are in mne that the volume fully justifies its title of 1540 AMPLIFIER HANDBOOK AND PUELIC AD. DRESS GUIDE. This great HANDBOOK on Public Ad. dress hould he read and etufdied by those who con sistentiv build, service and sell sound equipment. A MATCHLESS VOLUME As complete an you would expect to find any engineer. ing handbook -this Pi how the radio or P. A. man finds the AMPLIFIER NAND500K AND PUSLIC AD. DRESS GUIDE. With essential technical data compiled from nearly large ndredwdiffferent subjecctts coordinating I even, conceivable branch or sub- division THE CONTENTS To actually show the scope and magnitude f the AMPLIFIER HANDBOOK AND PUBLIC ADDRESS GUIDE.

3 An analysis of the rodents is found at the right. showing the breakdown of the material featured ithin each particular section. A thorough the contents shows the completeness of this ,.I, RADCRAFT PUBLICATIONS e 21 VESEY STREET I NEW YORK, N. Y. r ------------------ - - - - -- RADCRAFT PUBLICATIONS. INC. * 20 VESEY STREET * NEW YORK. N. Y. RC1040 Gentlemen. Enclosed find my remittance of 25e for which send me POSTPAID, one COPY of your NEW 1940 AMPLIFIER HANDBOOK AND PUBLIC ADDRESS GUIDE. Send me others for friends, aleo POSTPAID CA 2 -te each Name .. tild pst City State NOW READY FOR DELIVERY A Resume of the Contents of the AMPLIFIER HANDBOOK AND PUBLIC ADDRESS GUIDE FOREWORD INTRODUCTION Definitions -decibels, frequency, in- put, output, impedance, etc.

4 SECTION I- SOURCE Carbon microphones (single- button and double -button) Condenser microphones Velocity (ribbon) microphones Dynamic microphones Crystal microphones (sound -cell types, crystal diaphragm types) Cardioid microphones Contact microphones Phonograph pickups (magnetic types, crystal types) SECTION II- AMPLIFIERS Voltage Amplification Design of resistance -coupled volt- age amplifiers Commercial voltage amplifier The Power stage Class A amplifiers Class AB amplifiers Class AB, amplifiers Class AB, amplifiers Class B amplifiers When to apply class A, AB, and B amplification Power Supplies Half -wave rectification Full -wave rectification Voltage doublers Filter Circuits Power supply regulation, etc.

5 Practical Hints on Amplifier Con- struction Microphonism Placement of components Tone compensation Inverse feedback Remote control methods SECTION III- DISTRIBI'TION The Loudspeaker Dynamic speakers Speaker performance (frequency response, efficiency) High- fidelity speakers Speaker Barnes and Housings Outdoor speaker installations Power cone speakers Radial (360 distribution) speaker baffles SECTION IV- COORDINATION Input impedance matching Matching speakers to installa- tions Phasing speakers Effect of mismatching speakers to amplifier output A typical installation (in a skating rink) SECTION V- USEFUL. PUBLIC ADDRESS DATA AND IN- FORMATION Speaker matching technique The ABC of Db., VU, Mu, Gm and Sm Charts and formulas useful to the practical sound man Handy index to important articles on public address and sound I lip &oupon anal Remit by check or oney der; register letter you odds yarn or unused vis.

6 Postage Stamps. Today/ Order Your Copy NOW- MR. J. E. SMITH, President National Radio Institute, Dept. OKX Washington, D. C. Dear Mr. Smith: Mail me FREE, without obligation, your Sample Lesson and 64 -page book, "Rich Rewards in Radio," which tells about Radio's spart time and full time oppor- tunities and explains your 50-50 method of training men at home to be Radio Tech- nicians. (No salesman will call. Write Plainly.) Address City .1 ge You Can Train at Home for Radio and Television Clip the coupon and mail it. I want you to see how I train ambitious men at home in spare time to be Radio Technicians. I will send you a sample lesson Free. Ex- amine it, read it, see how clear and easy it is to under- stand.

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8 Automobile. police, aviation, commercial 'Radio; loudspeaker systems, electronic de- vices, are newer fields offering good opportunities to qualified men. And my Course includes Television, which promises to open many good jobs soon. Many Make $5 to $10 a Week Extra in Spare Time While Learning The day you enroll, in addition to my regular Course. I start sending you Extra Money Job Sheets -start show- ing you how to do actual Radio repair jobs. Throughout your Course I send plans and directions which have helped many make $5 to $10 u week in spare time while Sample Lesson pR Afy EE eivet* T lesson tex i AtQRac ur ceCCvl vem a lo ,Cou te auto," battery, er troubl g 4st And a$e a^d other 0p h tek Via/, 3 gees your the referees sets: re quick w,Drobable e 8ysterrr edy an receive is trou j and ment eaeck- upevot iaA tralizip balancing alfgn- can get.

9 Teeflogs 'leu - by +sailing t e onu1'rrge learning. I send special Radio equipment; show you how to conduct experiments, build circuits. This 50-50 training method makes learning at home interesting. fascinating, practical. I devote more than 10 Lesson Texts exclusively to Television methods and applications. and cover Television fundamentals thoroughly in my Course. You Get This Professional Servicing Instrument This Instrument makes practically any test you will be called upon to make In Radio service work on both spare time and full time lobs. It can be used on the test bench. or carried along when out on calls. It measures and voltages and currents; tests resistances; has a multi -band oscillator for aligning any set.

10 Old or new. You set this instrument to keep as part of your N. R. 1. COMIC Get Sample Lesson and 64 -page Book Free Act today. Mail maison now for Vmple lesson and 61 page book. They're FILER. They point out Itadio'a spare time and full time opportunities and those rooting In Television; tell about my Course In (radio and Television: shOW more than 100 letters from men I trained, telling what they are doing and earning. Read my money back agreement. Find out what Radio otters you. Mall Coupon In envelope or pane nn pinny postcard-SOW? J. E. SMITH, President, National Radio Institute Dept. OKX, Washington, SP e cia /ires in Aviation faftio 1f1 'gym with the teal' - Co - Signal usa in and ep ffarlio, lin a dfeth, amubure of bette nay n with Any r man to ans What haves don al ode L.)