Radio today (Apr-Dec 1939)
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More Sound Products
Professional recorder
* Leader in new line of recorders is model with 12 inch turntable recording at 33 1/3 or 78 r.p.m. Dual action lever control cutting head. Internal rim drive completely insulated. Symphonic induction play-back. Indicator for depth of cut. David Bogen Co., Inc., 663 Broadway, New York, N. Y. — Radio Today.
Sound amplifier
k New series offers two sizes of sound amplifiers with 30 and 70 watt RMA ratings. Featured are extreme fidelity, four low-impedance (250 ohms) mixing circuits, all with remote mixing, and walnutfinished cabinet with slanting panel recessed and edge-glow illuminated. Pre-amplifier and power stages are sectionalized and designed for rackand-panel mounting. Second mixer and extra power stages can be added up to total output of 280 watts. Webster Co., 5622 Bloomingdale Ave., Chicago. — Radio Today.
72 watt sound system
k Compact 12 watt portable sound system comes complete with amplifier, crystal mike with 20 foot shielded cord and plug, banquet microphone stand, 2 — 10 inch P.M. dynamic speakers with 50 foot
cords and plugs and split type portable carrying case. Frequency characteristics within 3 db. from 45 to 10,000 cycles. Power output 12-13 watts at 13 per cent distortion. Outputs 2/4/8/250/500 ohms available. Power consumption is 72 watts at 115 volts. Webster Electric Co., Racine, Wis. — Radio Today.
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AC-DC amplifier
•k Simple switch changes DC input to AC on universal amplifier. Output is 15 to 20 watts on both voltages. Universal motor and turntable mounted on removable cover with tangent arm crystal pick-up. Separate inputs with electronic mixing for mike and phono. Output is tapped for all speakers. Amplitone Products Co., 135 Liberty St., New York, N. Y.— Radio Today.
Marine horn
k Weather-proof marine type exponential horn and unit has frequency response 300 to 6,000 cycles. Overall depth is 12 inches with bellopening-diameter of 15% inches. Voice coil impedance of 15 ohms. P.M. field. Coverage angle of 30 degrees. Handles 20 watts audio input, efficient at 2 watts with good output level. Has three holes for mounting. Model WSH-101, list $115. Atlas Sound Corp., 1451 39th St., Brooklyn, N. Y— Radio Today.
Recorder-playback
k Low cost recorder will cut up to 12 inches on acetate coated or aluminum discs with 5% minutes playing time. Monitoring of volume done with earphones. Equipment includes high frequency cutting-head, amplifier, turntable and dynamic or crystal mike. Comes in portable leatherette case with P.M. speaker and cord in lid for use as p.a. system. Universal Microphone Co., 44 Warren Lane, Inglewood, Cal. — Radio Today.
Communication receiver
* Ten tube communication receiver with built in frequency monitor, uses noise limiter, an "R"
meter, one stage R.F. and two stages of I.F. with a beat frequency oscillator and optional crystal filter circuit. Output of 4% watts supplied to external speaker. List $79.95 with speaker, less crystal. Howard Radio Co., 1731-35 Belmont Ave., Chicago. — Radio Today.
75 watt system
k 15 watt high gain amplifier uses inverse feed-back. Tone compensator helps eliminate speak-back difficulties. Three input channels with separate volume controls mix two microphones and phono pickup. Has beam power output tubes and tap switch for selecting impedances. Includes 2-inch P.M. loud speakers and choice of dynamic, velocity or crystal mike. System can be wired for remote control and is available without carrying cases for permanent installation. Bell Sound Systems, Inc., 1183 Essex Ave., Columbus, Ohio. — Radio Today.
Motor and pick-up assemblies
•k Two phonograph assemblies each include pickup of high-impedance crystal type with true tracking feature, non-set stop, 10 inch turntable and mounting plate. Both play 10 or 12 inch records. Model AKX has G.I. KX motor while Model ACX has CX motor. Available for all AC voltages and cycles. Not furnished for DC. General Industries Co., Elyria, Ohio. — Radio Today.
Dynamic mike
k Dynamic microphone available in three models: 30, 200 and 500 ohms. Last two incorporate a built-in, wide-range impedancematching transformer. Response curve of each unit individually plotted, copies free on request. Model 702-D. Carrier Microphone Co., Inglewood, Cal. — Radio Today.
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RADIO TODAY