Radio today (Sept 1935-Dec 1936)

INDEX OF SPECIFICATIONS published in RADIO TODAY Auto radios* Feb. page 22 Multi-range meters . . .Mar. page 30 Tube testers Mar. page 32 Radio set analyzers. . .Mar. page 34 Cathode ray oscillographs May page 34 Farm sets*, 170 models July page 30 I.F.-R.F. oscillators. . .Aug. page 47 1937 sets*, 863 models. Sept. page 47 *I.F. peaks listed for over 1000 of the 1937 receivers. Store Demonstrations that sell sets! if >"eat, individual outlets for each set. As many as 25 outlets working on one TACO Master Antenna System. Simple to install. Inexpensive. Provides all-wave reception. Minimum background noise. Each set operates at peak efficiency. No need for home demonstrations— you can now sell 'em in your store! I) \T \ Write for data on how you can equip your store for better demonstrations and reduce your selling expenses on sets. TECHNICAL APPLIANCE COBP. Pioneers in Noiseless Antenna Systems 1 7 East 1 6th St., >«» w York City SERVICE NOTES {From preceding page) iA B!XM ■!■ B^ Weston with an eye to the future has an analyzer with 20,000 ohms per volt resistance and a 50 microampere meter. meter are equally necessary. The oscillator (modulated and unmodulated) should cover the entire intermediate and radio frequency range. The minimum output, should be sufficiently low so that sets can be aligned below the AVC operating point — the maximum output should be great enough to force an I.F. signal from the antgnd. terminals through the set. This latter feature is necessary in adjusting wavetraps. If the output meter is of the decibel type it will be valuable for measuring both gain and output — in P.A. work a decibel meter is indispensable. For sound work an audio frequency oscillator will be found extremely useful. The newest service instrument is the cathode-ray oscillograph. When properly used it will paint pictures of what is happening inside a radio — and there is practically no limit to the information that it will give out. Most servicemen have the erroneous idea that it is useful only for alignment work — but alignment is only a small part of its usefulness. The oscilloscope is truly the serviceman's X-ray. For store sales a tube tester is excellent, but the serviceman who must operate with the least amount of equipment can easily get along without it by employing a substitution test in the set in conjunction with his test oscillator and output meter. First render the AVC inoperative by shorting the grid returns to ground — then feed a signal through the set. The output meter will indicate a great increase in volume when a poor or defective tube is replaced by a good one. This method tests the tubes under actual operating conditions in the cus(To page 50) Better Filtering f^j ^) In Tight Places " ^ Three entirely independent sections in one compact can — that's the idea of the new Series 3GL electrolytics. ir Six leads — two for each section. Unit measures only 1%" dia. x 3H or 4*4" high. Inverted mounting, if Two ratings — 250 and 450 v. working. In 4-4-4, 8-8-8, 8-8-16 and 8-16-1G mfd. combinations. * Also the 2GL. Series, with two sections in one can. * Just the thing for improved filtering in tight spots. JVet« CATALOG: Jnst »»*■ l\OT* pages. More items. Lower prices. Ask your local AEROVOX jobber for your copy, or write us direct. FKvvM CORPORATION S*3 Washington St. Brooklyn, X. Y. MODEL CRA Cathode-Ray Oscillograph with new stabilized circuit and all controls In the normal plane of vision — the front panel; convenient, too, for wall mounting. Net cash with all tubes, S84.50. Only S9.50 down. MODEL OM-A Inductor-Sweep Oscillator with the C-B hand calibrated precision and 25 inch tuning dial. Accurately calibrates the selectivity curve. Net cash, $57.75. Only $6.50 down. MODEL 81 -A Frequency Modulator for use with your present oscillator to produce calibrated selectivity curves. Net cash, $34.25. Only $4.00 down. Build Profits, Prestige with C-B proved CATHODE-RAY EQUIPMENT New sets, new service methods demand the speed and precision offered by CLOUGH-BRENGLE Cathode-ray equipment. No other has the background of experience of these 1937 models, whose predecessors are used today on the production lines of fifteen leading set manufacturers. Write for NEW 1937 Catalog The CLOUGH-BRENGLE CO. 2827 W. 19th STREET CHICAGO, U. S. A. 48 Radio Today