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NEW THINGS
Latest news of radio products from the manufacturers
Utah speakers
+ 3y2 inch dynamic speakers featuring PM and electrically excited fields. Will handle five watts. Zy% ohm voice coil. Frequency range of 200 to 8,000 cycles. EE model has 450-ohm field requiring 3 to 6 watts excitation. Utah Radio Products Co., 820 Orleans St., Chicago, 111. — Radto Today — see also advt. p. 51.
Push-button tuning motor
•k Dependable, low cost motor for push-button tuning. Self-aligning, oilless bearings guarantee permanent shaft alignment and noiseless operation. Thermostatic protection. Measures only 2%x2%x 1% inches. Mounting and gear assemblies to specification. Model P. Alliance Mfg. Co., Alliance. Ohio. ■ — Radio Today.
Jensen replacement speakers
+ Low-cost line of speakers for replacement purposes. Made in 5, 6, 8-inch sizes. Fixed or adjustable impedance transformers, wide assortment of field coil resistances. Series "S." Jensen Radio Mfg. Co., 6601 S. Laramie Ave., Chicago, 111. — Radio Today.
Tobe weatherproof filterette
* Weatherproof noise filter unit for outdoor installation on police call relays. Eliminates noise occurring from flashing lights used in police recall systems. Unit is contained in weatherproof, cast iron housing for of inductance and capacity to prevent the feedback of interference to the electric power supply line or its distribution along the wiring between the relay and the call lamp. Tobe Deutschmann Corp., Canton, Mass. — Radio Today.
Ceramic condenser
* Fixed condenser with temperature coefficient designed to compensate for temperature changes in radio set. Available in temperature coefficient from — .00060 to 0. Capacitances from 10 to 1,000 micromikes are available. Small mass permits following of ambient temperature with minimum of lag. Described fully in Bulletin No. 20. Centralab 900, E. Keefe Ave., Milwaukee, Wis. — Radio Today — see also advt. p. 54.
Mutual conductance tube tester
+ Counter and portable type tube checkers employing dynamic mutual conductance test principle. Uses square meter with translucent illuminated dial. Indicates tube value in microhms and "good, bad, doubtful." Sufficient plate current to check emission. Checks gas content and open and shorted elements. Models T-54-P and T-54-C — net $49.80. Hickok Electrical Instrument Co., 10514 DuPont Ave., Cleveland, Ohio — Radio Today.
Lauson engines
■* Air-cooled four-cycle gas engines of compact dimensions. Ratings of %, %, and 1 H.P. Ball bearings. Extremely light weight. Dust-sealed magnetos, oil bath air cleaners. Lauson Co., New Holstein, Wis. — Radio Today1.
Heavy-duty R.F. choke
* Duo-lateral type choke for radio interference filtering. Rated at 150 amps DC. 12-inch diameter winding of No. 1 B & S gauge flexible cable. Used in installations such as large flashing signs. J. W. Miller Co., 5917 S. Main St., Los Angeles, Calif. — Radio Today.
Hy-tower charger
+ Wind-driven battery charger made entirely of steel except for propeller and generator end plates. Non-arcing collector ring. '"Slipthe-wind" governing principle. Vibration and tail vane fluttering eliminated. Parris-Dunn Corp., Clarinda, Iowa — Radio Today — see also advt, p. 53.
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Radio Today