Radio Broadcast (May 1929-Apr 1930)

A BIG Load Off the Service Man's Chest Trouble Shooter's Manual by JOHN F. RIDER The first comprehensive volume devoted exclusively to the topic uppermost in the mind of every man who repairs or builds a radio receiver. . . . No more torture tracing circuits . . . Instant service information . . . How to be a successful service man . . . The most valuable Radio Service Book ever published. 22 Chapters Cover: Service JT Procedure, Practical Application of Analysis, Vacuum Tubes, Operating Systems, Aerial Systems, A Battery Eliminators, Troubles in A Eliminators, Trouble Shooting in A Eliminators, B Battery Eliminators, Troubles in B Eliminators, Trouble Shooting in B Eliminators, Speakers and Types, Audio Amplifiers, Troubles in Audio Amplifiers, Trouble Shooting in Audio Amplifiers, Troubles in Detector Systems, Radio Frequency Amplifiers, Trouble Shooting in Radio Frequency Amplifiers, Series Filament Receivers and Testing and Testing Devices. Wiring Diagrams of these Commercial Receivers : Radio Corp. of Amer. At water-Kent Zenith Fada StewartWarner Philco Freed-Eisemann A 11American Colonial Amrad Deforest Garod Operadio Magnavox Federal Crosley Majestic Stroniberg-Carlson Grebe Freshman Kolster Day-Fan Workrite Spartan Ware Kennedy Sleeper Grimes More than 200 different models of commercial radio receivers . . . old and new . . . many never published before. 240 pages 8V2"xll" Black Flexible Fabrikoid Binding PRICE $3.50 POSTPAID This book ivill be worth hundreds of dollars to you RADIO TREATISE CO. 1440 Broadway, New York City • USE THIS COUPON..........! Send me the Trouble Shooter's Manual. Here is my money. Name. . . Address. City State. . . . R. H. AUTOMATIC VOLUME CONTROL (Continued from page 357) "free" end of the sensitivity potentiometer and ground is an equalizing arrangement which tends to keep the attenuation constant over the whole broadcast band. The ten-ohm resistor in series with the sensitivity potentiometer is to prevent the signal from being cut off entirely by this control. To select a station with this receiver the operator depresses the "silent key" and rotates the "station selector knob." To make the approximate tuning adjustment he observes the selector dial, and after this he observes the needle of the "visual tuning meter" for the accurate tuning. The selector knob is moved slowly back and forth over a short distance until the maximum deflection of the meter pointer, in the direction of the arrow on the meter dial, is obtained. The silent key is now released and the signal is heard from the loud speaker. Now the manual volume control is adjusted, if necessary, to secure the proper room volume. When tuning from station to station the above procedure is also followed, but the manual volume control seldom will require resetting. Mechanically this receiver is of similar construction to the Nos. 641 and 642 receivers. The pictures accompanying this article, Figs. 1, 2, 3, and 8, illustrate the construction of the chassis. HAVE YOU PERSONALITY? — THEN SELL IT (Continued from page 325) genuine sincerity stands out as it never did before. We are in a hypocritical period, not because we like it, but because we haven't yet worked out of it and beyond it. It is a fault of this period that we fail sometimes to make a real profit and build true friends out of acting naturally, but think that to succeed, we must put up a bluff at seeming to be something which we are not. My advertising advice to radio retailers, concretely, is as follows: (1) Use manufacturer's cut and copy service, but put something of your own into its use. (a) Occasionally, perhaps often, run such advertisements as they come to you. (b) Study them for style, approach, display, and learn from them something about how to have your own advertisements prepared. (c) If they seem to lack anything, write your opinions to the people who put them out and thus help to make them better. (2) Treat your own advertising very seriously. It is your message to your own trade. If a true message it should win friends by its sincerity. If you are a good, honorable chap at heart, the most profitable thing for you is to have everybody feel that to be true. Most people are really that way. The biggest response there is the response to sincerity. If you are a successful fakir by nature, you won't come here for advice anyway and you won't take it when it is given. Both merchandise and merchandisers can win on their merits, provided those merits include the very important one of being able to present their case well. This means for you the development of sales and advertising skill. Don't leave all your advertising work to the manufacturer. Get in to it up to your neck yourself. ROBERT S. KRUSE Consultant and Technical Writer 103 Meadowbrook Road, West Hartford, Conn. Telephone Hartford 4S327 SERVICING — is it an asset or a liability to you? J^OW many radio dealers are there who having tried to operate their own servicing department have given it up in disgust and "farmed out" the work to an outside service agency? Throughout the retail trade radio servicing has occasioned more grief and put more red figures in the ledger than any other branch of the radio business. Yet it has been demonstrated time and again since the Weston Model 547 Radio Set Tester was brought to perfection and put on the market that radio servicing can easily be made one of the most profitable departments of radio retailing. With this set tester the service man's work is reduced to a certainty. No more is it necessary for the service man to waste time hunting for trouble. Model 547 gives him the answer instantly. The speed with which his work is accomplished reduces the cash loss occasioned by waste of time and enables him to do ten jobs in the same time it formerly took him to do four. Furthermore, his work is final. Once the job is done there is no necessity for a return call and the customer is satisfied and becomes a friend of the organization which uses the Model 547 Weston Radio Set Tester as its "trouble shooter." Weston Model 547 is provided with three instruments — all 3%" diameter and furnished with bakelite cases. Carrying case, movable cover, panel and fittings also are made of sturdy bakelite. A. C. Voltmeter— 750/150/16/8/4 volts. The three lower ranges are brought out to the Tester plug, and all five ranges are brought out to binding posts. 750 volt range is for testing secondaries of power transformers. 16 volt range is to provide for 15 volt A. C. tubes. Operations have been reduced — only one selector switch being necessary. D. C. Voltmeter — High range increased to 750 volts. Other ranges — 250/100/50/10/5 — all six ranges brought out to binding posts and Tester plug. D. C. Milliammeter — Double range— 100/20 M. A. provides for lower readings with better scale characteristics. Tests — On A. C. sets the heater voltage and plate current can be read throughout the test while the D. C. voltmeter may be indicating plate bias or cathode voltage. Self-contained, double sensitivity continuity test provided. This can also be used for measuring resistance as well as testing for open circuits. Grid test can be made on A. C. or D. C. screen grid tubes — also the '27 tubes when used as a detector — without the use of adapters. Two sockets on the panel — UY tube adapters eliminated. WESTON ELECTRICAL INSTRUMENT CORPORATION 604 Frelinghuysen Avenue Newark, N. J. 366 • • OCTOBER 1929 •