Radio today (Apr-Dec 1939)

Record Details:

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More sound products (Continued from page 53) Rim-drive phono-motors •k Rim-drive type of turntable motor operates at relatively low speed, drives turntable rim through larger pulley acquiring lower angle of velocity. Eliminates turntable vibration due to resonance. Turntable covered with "flock" is obtainable in variety of colors to match cabinets. Webster-Chicago, 5622 Bloomingdale Ave., Chicago. — Radio Today. 20 watt amplifier k 7-tube amplifier with current consumption of 115 watts for output of 20 watts. T.H.D. at max. output 2 per cent. Gain 131 dbhigh, 78db-low. Output taps 2/4/8/15/500 ohms. Comes with AC on and off switch and 8 ft. cord. Available for all voltages and frequencies. Model MC35. $75 list amplifier only. Morlen Electric Co., Inc., 60 W. 15th St., New York, N. Y— Radio Today. Frequency test record ■k 12-inch pressing recorded at 78 rpm with recording in three parts; a glide frequency run with breaks at frequent intervals when the freq. is announced; a 1,000 note in 2 db. steps from plus 8 to plus 18, breaks between steps; a 400 cycle note at plus 18 db. level. Zero reference is background level of recording when using standard playback needle. Universal Microphone, Ltd., 424 Warren Lane, Inglewood, Cal. — Radio Today. Beat frequency audio oscillator k Kit for the construction of a variable-frequency audio oscillator. Output from 20 to 15,000 cycles flat within 1 DB. Employs cathode-ray indicator for calibration indicator. Electron-coupled type oscillator for stability. Model CCA. Carron Mfg. Co., 415 S. Aberdeen St., Chicago, 111.— Radio Today. Radial cone projector k Non-directional type projector spreading sound uniformly over 360°. Utilizes dynamic cone type speaker. Maximum diameter of 30 inches and height of 14. Weighs only 5 lbs. less speaker. Model RCP. University Labs., 195 Crystie St., New York, N. Y. — Radio Today. 3-way microphone •k Switch at base makes mike uni-directional, bi-directional or non-directional. Uniform frequency response 40-10,000 cycles; sensitivity of minus 62 db for 10 bar signal. RCA Mfg. Co., Camden, N. J — Radio Today. Portable playback •k AC-DC operated unit with two-speed motor, takes discs up to 17J4 inches. Crystal pick-up, 10 inch PM dynamic speaker and amplifier using six tubes with output of 6 watts are other features. Microphone jack provided. Terminal Radio Corp., 68 W. 45th St., New York, N. Y.— Radio Today. THORDARSON AMPLIFIERS M 1919 j&tyowi eye cnuii:xTLdeccde> NEW 20 -WATT A Jewel in Steel • Quality at ... A • Beauty at .... V • Performance at . . • Compactness at . 75 00 LIST Model T-25W20 Controls: Two microphone, one phono, one treble and one bass. See your parts distributor or write factory direct for hee Catalog No. 600-D on the full line. Lists eight models including a new 28-watt mobile unit. 54 RADIO TODAY