DOCSLIB.ORG

An Ultra- Modern 9 -Tube Superheterodyne

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
An Ultra- Modern 9 -Tube Superheterodyne How to Build An Ultra- Modern 9 -Tube Superheterodyne Reactivating Oxide -Filament Tubes -A Modern Reflex Radio Set Tuning Meters -A Portable S. - W. Test Lab. -Tube Adapters SPE E D SPEED SPEED EFFICIENCY! Ever the Goal of the Progressive Manufacturer EFFICIENCY!! Ever the Need of the Service Man EFFICIENCY!! Ever Necessary to Flawless Reception in the Home. SPE E D Gives this and more....With Radio's Premier Tube Developments TRIPLE -TWIN TELEVISION t. FOTO- LECTRIC TUBES Write for latest free bulletins -Turn to Page 256A for our Card -Keep up with progress by contact with D CABLE RADIO TUBE CORP. 230-240 NO. NI NTH ST. BROOKLYN, N.Y. i A ii; c NIV:RSL-5'S WIN FAM [and [OkT11 N E Don't spendRADIQ/ your life slaving away in some dull, hopeless job! Don't be sat- isfied to work for a mere $20 or $30 a week. Let me show you how to make money in Radio -the fastest -growing, biggest field on earth? JOBS LEADING TO SALARIES OF $50 A WEEK AND UP! Jobs as Designer, Inspector and Tester -as Radio Salesman and in Service and Installation Work -as operator or Manager of a Broadcasting Station - as Wireless Operator on a Ship or Airplane, as a Talking Picture or Sound Ex- pert - HUNDREDS of OPPORTUNITIES for fascinating, well-paid Jobs! 10 Weeks of Shop Training At Coyne in Chicago You are given a thorough train- you -right here in the Coyne Shops man. Here is a great new field of Radio -the actual practice and experience that has just started to grow ! Prepare ing in Radio at Coyne -in 10 you'll need. NOW for these marvelous opportunities! Learn Radio Sound Work at Coyne, short, pleasant weeks by on actual Talking Picture and Sound actual work on real Radio, Tele- TELEVISION Reproduction equipment. vision and Sound equipment. Is Now Here! Coyne is 32 Years Old We don't waste time on useless You get Free Employment Help as theory. We give you the prac- And TELEVISION is already here! Soon long as you live. And if you need part - there'll be a demand for THOUSANDS of time work while at school to help pay ex- tical training you will need. TELEVISION EXPERTS! The man who penses we'll gladly do all we can to get it learns Television NOW can have a real for you if you will tell us your problems. Coyne Is All Practical Work at Coyne future in this great new field. Get in on 32 years old! Coyne training is tested -proven be- the ground -floor of this amazing new Ra- yond all doubt. You can find out everything ABSO- You are not trained by book study LUTELY FREE. JUST MAIL COUPON FOT'. dio development! Learn Television at MY BIC FREE BOOK. telling all about Jobs- at Coyne. We train you on a great COYNE on the very latest, newest salaries- opportunities. !flail the coupon - NOW! outlay of Radio, Television and Television equipment. I= MI IMM Sound equipment -on scores of rH . C LEWIS President modern Radio Receivers, huge Broadcast- Talking Pictures Radio Division, Coyne Electrical School ing equipment, the very latest Television 500 S. Paulina St., Dept. 72-811 Chicago, III. apparatus, Talking Picture and Sound Re- A Great Field production equipment, Code Practice Talking Pictures and Public Address Dear Mr. Lewis: - equipment, etc. You don't need advanced Systems offer thousands of golden Send me your Big Free Radio Book and education or previous experience. We give opportunities to the Trained Radio all details of your Special Offer. H. C. Lewis, Pres. Radio Division Founded 1899 Name Coyne Electrical School Address 500 S. Paulina Street Dept. 72-8H Chicago, Illinois 1 City State RADIO -CRAFT for OCTOBER, 1932 173 (dio. FOR THE aft\ SERVICE MAN DEALER RADIOTRICIAN HUGO GERNSBACK, Editor -in -Chief LOUIS MARTIN R. D. WASHBURNE Associate Editor Technical Editor CONTENTS OF THE IN OUR NEXT FEW ISSUES: OCTOBER, 1932, ISSU E ACOUSTIC FEEDBACK. In this article the author dis- VOLUME IV Number 4 cusses the factors involved in obtaining howl -free, high - gain microphone amplifier operation. EDITORIAL: Radio in Europe Hugo Gernsback 201 ONE -TUBE REFLEX LOUDSPEAKER SET. High -gain potentialities existent in the new tube types become NEW DEVELOPMENTS IN RADIO: dynamic in a novel receiver design that bids fair to Describing the Latest Tubes Louis Martin 204 attract widespread attention. The New "K" Tube C. Bradner Brown 206 A Portable Phono -Radio Receiver- Recorder Dr. F. Noack 207 CHURCH SOUND INSTALLATIONS. Technicians today The Latest Radio Equipment 208 must be prepared to successfully handle a sound instal - A Modern "3- Tube" Reflex Receiver. H. G. Cisin 212 lation in any one of the 200,000 churches in the U.S. The problems in this profitable field are discussed. SERVICE MEN'S DEPARTMENT: Operation and Service of Automatic Volume Control Systems W. S. Williams 211 THE SPECIALTY TESTER. Service Men long have Constructing Adapters for Test Equipment wanted this instrument, which solves the problem, "What F. L. Sprayberry 216 was the resistance of that burned -out resistor ? "; also, How to Rewire the Hi -Q 29 for the New Tubes it will indicate capacity values from 250 mmf. to 14 mf. Hubert Lee Frazier 218 Profits Via the Service Lab. M. C. Mancill 219 How to Reactivate Oxide- Coated Filaments Raymond Shaw 220 RADIO -CRAFT is published monthly, on the fifth of the month preceding The Service Man's Forum 222 that of date: its subscription price is $2.50 per year. (In Canada and foreign countries, $3.00 a year to cover additional postage.) Entered at Short -Cuts in Radio Service _ 223 the post office at Mt. Morris, Ill., as second -class matter under the act of Operating Notes Bertram M. Freed 224 March 3. 1879. Trademark and copyright by permission of Gernsback Publications, Inc., 98 Park Place. N. Y. C. RADIO SERVICE DATA SHEETS: Text and illustrations of this magazine are copyright and must not be No. 75: Galvin Motorola Model 61 Automotive Re- reproduced without permission of the copyright owners. We are also ceiver, (with type 85 duodiode- triode tube) 226 agents for WONDER STORIES and WONDER STORIES QUARTERLY. Sub- scription to these magazines may be taken in combination with RADIO - No. 76: Wells- Gardner Series 062 Automotive CRAFT at reduced Club rates. Write for information. Superheterodyne 227 Copyright 1932. GERNSBACK PUBLICATIONS. INC. TECHNICAL RADIO TOPICS: Building and Operating an Ultra -Modern Super Clifford E. Denton 202 H. GERNSBACK. President J. M. HERZBERG. Vice- President A Lapel Microphone (Part II) Dr. Irving Saxl 210 S. GERNSBACK, Treasurer I. S. MANHEIMER. Secretary Some Interesting Loudspeaker Facts Eli M. Lurie 213 Published by TECHNI-CRAFT PUBLISHING The Why and Wherefore of Tuning Meters CORPORA- L. van der Mel 214 TION. Publication office: 404 No. Wesley Ave., Mount Building Your Own A.F. Choke Coils Morris, Illinois. Editorial and Advertising Office: 96-98 C. H. W. Nason 215 Park Place, New York City. Chicago Advertising Office: RADIO -CRAFT Kinks 228 737 North Michigan Avenue, Chicago, Ill. Western Adver- tising office: 220 No. Catalina St., Los Angeles, Calif. The Radio Craftsman's Page 229 L. F. McClure, Chicago Advertising Representative. Loyd A Portable Short -Wave Laboratory H. Harrison 230 B. Chappell, Western Advertising Representative. RADIO -CRAFT's Information Bureau 232 Servicing New Receivers Floyd Fausett 233 London Agent: Hachette & Cie.. 3 La Belle Sauvage. Ludgate Hill, E.C. 4 Quasi -Optical Home Experiments John B. Brennan 234 Paris Agent: Hachette & Cie.. Australian Agent: McGill's Agency Over -the -Counter Suggestions Jack Grand 256A 111 Rue Reaumur 179 Elizabeth St., Melbourne An Easily Built 0 -800 V. Peak Voltmeter for Rectifier Work J. S. Williams 256B OBITUARY: R. A. Fessenden 207 BOOK REVIEW: N.R.I. Practical Laboratory Training Course 247 194 toACTUALo ' ' GUARANTEED a cu-o-zC- 'o Features of the Scott Allwave Deluxe 15 -550 Meters Includes major European, Asiatic, Aus- traban, African, South American and Domestic voice stations. Single Dial Tunes both R. F. and Oscillator cir- cuits in perfect alignment automatic- ally from 15 to 550 meters -without '!'here is no question -no doubt -no gamble in possible an absolute guarantee of actual world- trimmers. the purchase of a Scott Allwave Deluxe. No wide reception. Only the Scott Allwave Deluxe No Plug In Coils mere hope, to be followed by bitter disappoint- has a sensitivity of 4.1000ths microvolt per The Coils are not tapped. Entirely new ment. You KNOW - before you spend your meter at 1400 K. C.! That's one reason. system -actually MORE efficient than money for a Scott Allwave Deluxe-exactly second is that the Scott Allwave Deluxe is the plug in coils. what you are going to get in performance. ONLY receiver having such a low natural You KNOW you will hear England, France, noise level that the 4- 1000ths microvolt per New Class A Germany, Spain, Australia, South America and meter sensitivity can be used to yield loud, clear Linear Amplifier many more of the 300 intensely interesting for- reception over distances up to 10,000 miles! Gives perfectly uniform response to eign stations regularly received by owners of all frequencies from 30 to 8000 cycles know these Send for PROOF! at low as well as at high volume. Scott Allwave Deluxe receivers. You things, before you buy because this receiver is A great independent laboratory has charted Twin Speakers positively guaranteed to give you astud world- the sensitivity, selectivity and tone of the Scott Give actual reproduction to the per- wide reception ... every day ... regardless of Allwave Deluxe.
Load more

Recommended publications
  • Valves Were Expensive in the Early Days of Radio and So Designers
    By RODNEY CHAMPNESS, VK3UG would become gassy. Occasionally, even today, a valve with a purple glow inside it will be seen and this is often an indication that the glass to metal pin seal is not perfect and air has leaked VICTORIA into the valve. Incandescent light globes were the first items to have metal pins or wires protruding through a glass envelope. However, this created no real problem, since the vacuum created was satisfac- tory for their operation and the glass- to-metal seals were not as critical. In some cases, the globe was filled with an inert gas such as nitrogen to prevent Above: the Kriesler 11-41 was a popular evaporation of the filament. 4-valve reflex receiver from the 1950s. One problem with valves was that the metals used inside them (ie, for the elements and filaments) had to Valves were expensive in the early be carefully selected, otherwise they days of radio and so designers came up could emit gases when they became hot. These gases could then "poison" with clever techniques to minimise the a valve and adversely affect its per- valve count. One technique was known formance. So early attempts at making valves as "reflexing" and involved using the into viable amplifying devices encoun- same valve to work as both an RF or IF tered many difficulties. However, their potential to revolutionise radio was amplifier and as an audio amplifier. obvious and so a great deal of effort was put into solving these problems. It is for these and other reasons that valves were by far the most expensive nOMPONENTS such as tuning ca- had a small amount of gas left inside, and fragile components in early valve pacitors, inductors (both fixed and due to manufacturing limitations.
    [Show full text]
  • RF Communications : Systems & Circuits
    ELEN 665 RF Communications : Systems & Circuits Edgar Sánchez-Sinencio [email protected] Analog and Mixed-Signal Center,Texas A&M University 1 Fall 2009 WHAT ARE THE MAIN TOPICS INVOLVED TO FULLY UNDERSTAND RF DESIGN ? IC DES S IGN ON TI AND CA DEV NI ICES U MM CO N ICROWAVE G M SI E D TECHNIQUES F R SIGNAL PROCESSING APPLICATIONS 2 Analog and Mixed Signal Center, TAMU ELEN 665 (ESS) INTRODUCTION AND MOTIVATION • HOW DO LIVING BEINGS COMMUNICATE ? • HOW CAN WE MIMIC HUMAN COMMUNICATIONS ? • WHAT ARE THE FUNDAMENTAL ARCHITECTURES OF WIRELESS RECEIVERS AND TRANSMITTERS ? • WHAT ARE THE FUNDAMENTAL PROBLEMS IN A RECEIVER? How does non-linearity play a role? 3 Analog and Mixed Signal Center, TAMU HowHow dodo livingliving beingsbeings communicate?communicate? • Communicating is something that all animals, including humans, do. It could be a dog barking a warning, a cat arching its back, or crickets chirping, animals are always sending messages to each other. • Animals and plants react to stimuli which might come from other living things or from the environment. A stimulus usually causes the organism which receives it to respond to it. Animals use all their senses to communicate. • For example, some male birds develop colorful plumage so that the females will be attracted by a visual stimulus as well as by sound. • Bees (dogs) communicate by means smelling (sniffing). • Dolphins communicate through sounds. 4 • The signals which an organism uses can be visual (sight), sensual (touch), auditory (sound) or chemical Marine mammals establish contact with specific individuals using short-range vocalizations. The most singular example of marine mammals using sound to make or maintain contact is between mother and offspring.
    [Show full text]
  • 1991-07: the Story of Reflexes
    VII liliLdi gp e IRa~dln~o by PETER LANKSHEAR The story of `Reflexes' This month's column is not about rubber hammers and kneecaps, but a technology that persisted throughout the history of valve radio, and one that was exploited to its greatest extent in Australia. With semiconductors available today tal detector and then reflexed the audio valves coincided with a boom in at only a few cents apiece, it is difficult back to the grid of the valve to again `midget' radios, and an increasing de- to appreciate just how expensive ampli- amplify the signal. Any problems like mand for car radios. Economies in space fication was in the early days of radio. erratic operation and distortion were of and battery consumption became import- Not only valves, but every milliampere- little consequence. ant, providing an incentive to resurrect hour of precious battery power cost a lot reflexing. of money. Any way to economise was Early superhet use From late 1933 the Americans, espe- well received. An early 'high tech' application of re- cially RCA, made some use of the 6B7 in During World War 1, much research flexing was in Edwin Armstrong's first car radios as a reflexed IF and trans- went into triode valve applications. One generation of RCA superheterodynes, in former-coupled audio amplifier, with the US Navy worker, W.H. Priess, patented 1924. To keep the number of valves to a one valve providing IF and AF amplifi- the concept of passing a signal twice minimum, the first valve was used as an cation, diode detection and AGC.
    [Show full text]
  • Build an Old Time One-Valve Radio T
    •~ a.. e e Ifito .ega'3a, . tr Ssc~ . a~:r"..,`'r"'~g~~ t.~.= ~ y~~..i•'`'E~;sr,:~ .?-~`.r ;~'~I:i'Y ~~":'-:2i:5'-~'r:" *: ap~ i d -.t e -•i' e'•,y`. z'a--'~ ~a.r •~`,`'t ,'-yerk',t"3-c .rLt ~`u"r. ,~,`.~f'F' 06***104r"' G: _•ad2r. r,`r,*•r--,.x-00-fti;,s -,yr-4.o o-+J-0,0_4 03-c?'rv7-F * Special `nostalgia' project: BUILD AN OLD TIME ONE-VALVE RADIO T There's a lot of interest nowadays in building simple valve-based radio sets, of the type that were popular from the 1920s right up until the 1960s. Here's the first of two articles which give all the information you'll need to construct an authentic one-valver starting with a basic `grid-leak' set and progressing to a regenerative circuit with surprisingly good performance. Enough information is given to allow you to use almost any old valve or other components to hand. by PETER LAUGHTON Cleaning out my radio `shack' (read had, and how much I'd learned. This, cussion is the following project. mess) the other day, I came across a along with several recent Letters to The circuits described can be built number of radio receivers that I con- the Editor asking for more vintage using almost any combination of com- structed years ago based on valves, radio projects, resulted in me talking ponents, even from junked valve TV and remembered how much fun I'd to Jim Rowe, and the result of that dis- sets.
    [Show full text]
  • Acme.Pdf (8.05Mb)
    Amplification without Distortion A Discussionon Radio with Particular Refer- ence to the Construction and Operation of Radio Audio and "REFLEX" Amplifiers and Sets. Have you ever stopp€d to cousider what makee it poseible for you to hear the distant broadcasting station, to fill the room with music, to communicate with the amateur hundreds of miles away? It is amplification-the key to Radio, Amplification is used on both the transmitter and receiver, and with it thc ringer's voice in New York is transported to the farm in Ohio, or the President of the United States talks to the whole country just as though he werc in milliona of homes at the same time. But Radio without amplification would be a ship without a sail ! Amplification eliminates distance and permits a room or hall full of peoplc to be entertained simultaneously, but the limits of radio and amplification should be clearly understood, especially in regard to distance. The transmission rangc of radio varies greatly between day and night, city and country, summer and winter, and from oight to night, and in such a manner that no €ract rante can be specified for aoy particular aet. August, 1924 At-ti'n .. s the most eimple radio e€t will pick up broadcasting ltations at con- sidersble distancesaway, but usually this reception is a freak, anJcannut be dupli. cated at will. As the set becomes more elaborate (that is. as amplification'sreater is added) the reliable distance over which it will operate becomeg and treater up to a safeestimate of 300 to 500 miles in the winter eveningswhen using a loud speaking telephone and loop antenna.
    [Show full text]
  • Electronic Home Music Reproducing Equipment
    Electronic Home Music Reproducing Equipment Daniel R von Recklinghausen Copyright © 1977 by the Audio Engineering Society. Reprinted from the Journal of the Audio Engineering Society, 1977 October/November, pages 759...771. This material is posted here with permission of the AES. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the AES by contacting the Managing Editor, William McQuaid., [email protected]. By choosing to view this document, you agree to all provisions of the copyright laws protecting it. John G. (Jay) McKnight, Chair AES Historical Committee 2005 Nov 07 Electronic Home Music Reproducing Equipment DANIEL R. VON RECKLINGHAUSEN Arlington, MA The search for amplification and control of recorded and transmitted music over the last 100 years has progressed from mechanical amplifiers to tube amplifiers to solid-state equipment. The AM radio, the record player, the FM receiver, and the tape recorder have supplemented the acoustical phonograph and the telephone. An incomplete summary of important developments in the past is presented along with challenges for the future. Home music reproduction began when Bell invented the tromechanical repeater caused it to be used for 20 years telephone in 1876 and Edison invented the phonograph in more as a hearing-aid amplifier [5, pp. 64-69]. 1877. Instruments were manufactured soon thereafter and C.A. Parsons of London, England, inventor of the leased or sold to the public. Yet the listener had very little Auxetophone, marketed in 1907 a phonograph where the control over the reproduction and the volume of sound, the playback stylus vibration caused a valve to modulate a tone quality being predetermined by the manufacturer of stream of compressed air which was fed to a reproducing the phonograph and record or by the telephone company horn [6].
    [Show full text]
  • Amplification Without Distortion
    Amplification without Distortion cAcme Apparatus Company • ElGHTH BDmON Amplification without Distortion A Discussion on Radio with Particular Refer� ence to the Construction and Operation of Radio Audio and" REFLEX" Amplifiers and Sets. Have you ever stopped to consider what makes it possible for you to hear the distant broadcasting station, to fill the room with music, to communicate with the amateur hundreds of miles away? It is amplification-the key to Radio. Amplification is used on both the transmitter and receiver, and with it the singer's voice in New York is transported to the farm in Ohio, or the President of the United States talks to the whole country just as though he were in million.. of homes at the same time. But Radio without amplification would be a .hip without a sail! Amplification eliminates distance and permits a room or hall full of people to he entertained simultaneously, but the limits of radio and amplification should be clearly understood, especially in regard to distance. The transmission range of radio varies greatly between day and night, city and country, summer and winter, and from night to night, and in such a manner that no exact range can be specified for any particular oet. B.&.N A-920 February, 1925 At times the most simple radio set will pick up broadcasting stations at con­ siderable distances away, but usually this reception is a freak, and cannot be dupli­ cated at will. As the set becomes more elaborate (that is, as amplification is added) the reliable distance over which it will operate becomes greater and greater up to a safe estimate of 300 to 500 miles in the winter evenings when using a loud speaking telephone and loop antenna.
    [Show full text]
  • The KH-27 RECEIVER by Kenneth Harkness
    TELEVISION ON LIGHT RAY! 15 Cents Tubeless Amplifier Announced D10 Grid Biasing Through Resistors Reg. U. S. Pat Off. A Simple 4 -Valve Circuit America's First and Only National Radio Weekly Hookup for Overseas 'Phone Set ol. 10 No. 19 Illustrated The KH-27 RECEIVER By Kenneth Harkness FIG. 1-The wiring diagram of Kenneth Harkness' latest receiver, the KH-27. See article on page 3. J.; FIG. 2-Top view of the receiver after the wiring has been completed. 110W TO RID RECEIVERS OF PARASITIC NOISES 1,ANGMUIR'S GREAT LABORATORY ADVENTURE RADIO WORLD WITH so much interference these days, why not improve your detector tube action and gain selectivity? Simply install a Bretwood Variable Grid Leak.Price $1.50. .,.moo al The Bretwood Variable Grid Leak NORTH AMERICAN BRETWOOD CO., 143 West 45th Street, N. Y. City. Enclosed find $1.50, for which send me one Bretwood THE Bretwood Variable Grid Leakmay Variable Grid Leak (or $2.00 for leak with grid condenser attached) on five-day money -back guarantee. be installed in any receiver ina few minutes.Single hole panel mount makes NAME this possible. Use a Bretwod andmarvel at STREET ADDRESS the difference! CITY and STATE (Inquiries Invited from the Trade) By ARTHUR H. LYNCH How to Build A Series of Five Important Articles on THE DIAMOND 5 -Tube Model HOW TO USE THE DE LUXE SYSTEM Herman Bernard, designer of this wondercir- mai, has written at, illustrated bookleton "How This seriestells how tobuildthe 2 -tube to Build RADIO WOILD'S Improved Diamond the Air." of De Luxe Receiver (without audio) and how to Send 50c and getthis booklet,in- cluding afull -sited wiring blueprint and free adopt this or any other set so as to obtain the name piece.
    [Show full text]
  • Circulation Larger Than That of Any Other Radio Publication
    CIRCULATION LARGER THAN THAT OF ANY OTHER RADIO PUBLICATION SEPTEMBER 25 Cents Over 200 Illustrations Edited by HUGO GERNSBACK r ulf ist tN . ri aumum SCIENCE and INVENTION RADIO REVIEW AMAZING STORIES RADIO INTERNACIONAL www.americanradiohistory.com Radio News for September, 1926 193 majestically sweet LKE the grand cathedral organ- Due co the exclusive direct -drive unit mighty monarch of all musical in- with its eight points of contact from unit struments -the new Tower Cone runs the to cone, the new Tower Cone gives not entire gamut of tone, bringing to you each only a complete range of tone, but a note, majestically sweet and clear -with beauty of "voicing ", and a' responsiveness the variety of color and shading de- to changes of tempo, long sought but manded by the real musical critic. never until now achieved. Your Dealer Will Be Glad to Demonstrate www.americanradiohistory.com Radio News for September, 1926 'NIEWS Published by EXPERIMENTER PUBLISHING COMPANY, Inc., Publishers of "Radio News," "Science and Invention," "Radio Internacional," "Radio Review" and "Amazing Stories." Editgrial and General Offices: 53 Park Pl., New York City H. GERNSBACK, President. S. GERNSBACK, Treasurer. R. W. DEMOTT, Secretary Member: Audit Bureau of Circulations Radio Magazine Publishers Association SEPTEMBER, 1926 NUMBER 3 Contents of This Issue: [®3 Is Radio at a Stalidstill? The Eusonic Receiver, By Hugo Gernsback 203 By Joseph Bernsley 228 How to Make Radio Pay Your Way, How to Build Wireless Receivers, By C. William Rados 204 By Edmund T. Flewelling 231 Television an Accomplished Fact, A Family Receiver, By Watson Brown 232 By A.
    [Show full text]
  • Rado May03 1924 .Pdf
    2 Radio Doings Business Has Been So Good This Week That We Have'nt Found Time To Write An Ad KENNEDY ghc1Royally g' (Radio Ask Any Kennedy Dealer WHOLESALE ONLY KIERULFF & RAVENSCROFT 1630-1632 South Los Angeles Street, Los Angeles, Calif. Phones: ATlantic 3125-ATlantic 3303 1Rabio doings Phone TRinity 6062 H. C. CHARLES, Editor 1.T.PERDUN,Manager HALL BERRINGER, Technical Editor Branch Manager: R. L. CONNER, 703 Cunard Bldg., San Francisco, PhoneGarfield 4557 Advertising Representativest J. C. PENLEY J.B. SHILLINGFORD LEE FELTSKOG 308 Van Nuys Building Los Angeles, Calif (Entered assecond-classmatter,November 25, 1922, Los Angeles, California Post Office, Cinder Act of March 3, 1897) Copyright,1924,by Harwood PublishingCo. FiveCents a Copy Two Dollars a You. Vol. IV. Los Angeles, May 3, 1924 No. 18 National Music Week THE week of May 6th to 12th has bee designatedMusic Week.It is particu- larly fitting that the radio public should help tocelebrate this week.Radio and broadcasting without music would be like arailroad train without the engine or an automobile with no gasoline. Weshould all get tired in a very short time of listening in to just talk. Music, since the early days of history, has alwaysentered into the culture of all nations.Most countries have music that is distinctive.It is easy to distinguish an Italian, Spanish, Irish, Scotchair as soon as you hear it, and it seems to fit the natures of those inhabiting these countries.So we have music for all moods and fancies.Music can inspire us when we hear out nationalanthems, and can make us sad when we hear funeraldirges.
    [Show full text]
  • Reflex Radio Receivers 1924 Ocr.Pdf
    The "Experimenter's Library" 25c. Books Covering Every Branch of Radio Each book is written by a well-known author and con• tains 48 pages of valuable (••HM.TICAI. KflOlO information, fully illustrated. ftWf(U(Ni". r,fr.v Cover is in two colors, size 5/4 x7K inches. No. 1. Tips for the Radio Amateur Constructor. Hi No. 2. How to make Practical Radio No. 3. Receiving Set*. Radio Questions Answered. No. 4. Radio Frequency Amplification No. 5. Loud Talkers and How to Build Them. No. 6. IftAOlC QUESTION ALL ABOUT • How to Tune Your Radio Set. RADIO PARTS No. 7. 100 Radio Hook-ups. No. 8. All About Radio Parts. No. 9. History and Operation of the No. 10. Vacuum Tube. The Neutrodyne—All About It. No. 12. How to Locate Troubles in Your Radio Set. I © T«t(..^ Each 25c. Postpaid HOW TO TU«F. you ft f- flO.O SET THE CONSRAD COMPANY, inc. Selling Agents 233 FULTON STREET NEW YORK CITY THE EXPERIMENTER'S LIBRARY, No. 13 Reflex Radio eivers By P. E. EDELMAN TRADE Published by THE E. I. COMPANY 233 Fulton Street New York City Printed in the United State* of America Copyright by THE E. I. COMPANY 1924 All rights reserved, including: that of translation into foreign languages, including the Scandinavian INTRODUCTION. The growing popularity of reflex types of broadcast receivers is due to the efficient use of fewer vacuum tubes than equivalent outfits of different character re• quire. The reflex principle was proposed by Schloemilch and Von Bronk in their U.
    [Show full text]
  • Transistor Circuits Mai{Uai
    7 No. f 68 216 TRANSISTOR ,'\ ) CIRCUITS MAI{UAI, { No. 4 by CLIVB SINCLAIR C,lTTCLI'IS I!,\I] iiis] R,UCTXOiVS F]S}I BLIilLDING "frvo L tran.sistor supr:rilet. ). Ii!-Fi tape acri picii-up pre-arnp. l. lli-lji 3+irtt unrpli!iir- l. triiii;rture ma:.;\ D.:\,.cr packs. 5. 5 ficis to 2 mc/s sign:il injecfor. 6. Scnsitive subrtiniaiure lcudsgre:rker.racllo, 7" Single t;rrasistor reg;r_.ner*tivereceiver. .i5-rrntf $, puirlic arirlrer;sanip!ifiei. -[ransirlor 9, voltmrrer. Ii.i" Sirnple earpiece r.eflex receir.er. ; i. Simp)i..transnritter. BERNARDS RADIO MANUALS r TRANSISTOR CIRCUITS MANUAL No. 4 by CLIVE SINCLAIR LONDON BERNARDS (publishers)LT.D BERNARDSRADrO MANUALS No. 168 GeNrn.,rr-Eorron : CLIVE SINCLAIR First publishedDecember 1960 Repr.in,tedNovember, 1964 ReprintedJanuary, 1966 ReprintedMay, 1967 On Page II TAPE AND PICK-UP PRE..{N,PLIFIER In third paragraph of text, third line should read : 8 volts, not 2 volts. On Page 12, Fig. 3 The 330K rcsistor betweenthe beseof Tr. I arrd the emitter of Tr_I should bc of pre_settype. o 1e60. Printed by V. Cooper parrners - & Ltd. Flitcroft Street, W.C.2. I'or Bernards(publishers) Ltd., The Grampians,western Gate, w.6. l* '- l CONTENTS Page Introduction 5 Noteson useof OCl69 transistor :'. 6 l. Two TransistorSuperhet.., 8 . ) I'Ii-Fi Tape and Pick-Up Pre-amplifier... 11 3. Hi-Fi 3-wattAmplifier 15 4, Miniature Mains PowerPacks ... l8 5. 5 Kc/s to 2 mc/s SignalInjector... 2L 6, SensitiveSubminiature Loudspeaker Radio 23 " 7. The " Mighty Atom SingleTransistor Receiver t{ 8.
    [Show full text]