Radio today (Jan-Mar 1939)

Record Details:

Title:
Radio today
Date:
Jan-Mar 1939
Publisher:
New York : Caldwell-Clements, Inc.
Volume:
Radio today (Jan-Mar 1939)
Leaf #:
00036
Language:
English
Collection:
Broadcasting & Recorded Sound
Format:
Periodicals
Contributor:
Library of Congress, MBRS, Recorded Sound Section
Sponsor:
Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division
Coordinator:
Media History Digital Library
Description:
Date Added:
December 21, 2023
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NEW THINGS Dual atoms • Dry-tubular electrolytic condensers in dual sections with 50 to 450-volt ratings Capacities of 8, 10, 12, 16 mikes. Proofed against blowouts, yet hermetically sealed. Sprague Products Co., North Adams, Mass. — Radio Today. Ballastron plug-in resistors * Line of three plug-in resistors to replace line-dropping resistors in AC-DC sets. Three types replace 98 per cent of units bearing R.M.A. type numbers plus about 300 special manufacturers' numbers. Micamold Radio Corp., 1087 Flushing Ave., Brooklyn, N. Y. — Radio Today. Kontak mike * Contact-type microphone with higb output so that it can be used with home radio set. Output level of — 30 DB. Flat response within 1 DB from 60-8,000 cycles. Applied without tools by means of adjustable clamp. Model SKH — high impedance— list $12. Amperite Co., 561 Broadway, New York, N. Y. — Radio Today. Hermetically-sealed attenuators * Glass-sealed attenuators with perfect protection against all atmospheric conditions. Furnished to match impedance of any line and give any loss from V± to 40 DB. Fitted with radio-tube base to fit standard socket. Obtainable in H. pie, T, and L pads for low wattage applications. Ohmite Mfg. Co., 4835 Flournoy St., Chicago, 111. — Radio Today. Clarion sound system •k 15-18-watt portable sound system. Beam-power output stage. Dual 10-inch speakers in baffles. Choice of microphone. Multi-output impedances. Fabricoid carrying case. Model C-416 — complete ready to operate—list $108.60. Transformer Corp. of America, 69 Wooster St., New York, N. Y. — Radio Today. Replacement speakers ■*■ Line of replacement speakers with uni-match transformers that cuts down inventory. Transformer mounted on speaker by means of 2 self-tapping screws. Rotary switch adjusts transformer to hi, lo, or medium impedance. Operadio Mfg. Co., St. Charles, 111. — Radio Today. High-voltage resistors * Line of metallized resistors for high voltage. Available in 4 and 150-watt ratings with 5,000 and 100,000 volt capacities. Metallized element applied in spiral on ceramic base. International Resistance Corp., 401 N. Broad St., Philadelphia, Pa. — Radio Today. ' ' ■"■' ■'■■' ■ I -.■ '■■■." :: ....■-■ :::'j SbM r«jjSr~| ■ ftSHHCM : 1 . :T Amcon condensers * Line of transmitting capacitors, impregnated by a process that combines safety factor of oil and economy of wax impregnation. Sealed in steel cans with high-melting point wax. American Condenser Corp., 2508 S. Michigan Ave., Chicago, 111. — Radio Today. Electronic switch * Combined square-wave generator and electronic switch. Switch permits simultaneous study of 2 separate waves on the oscilloscope. Switching rate of 6 to 2000 times per second. Switching impulses or tails reduced to degree where they are no longer objectionable. Square wave generator operates between 60 and 400 cycles per second and is useful for checking amplifiers. Allen B. Dumont Labs., 2 Main Ave., Passaic, N. J. — Radio Today. Coil repair service * Repair and rewinding service for all types of radio coils. Prompt, efficient service. Simply send the defective coil accompanied by as much pertinent information as possible. Coil will be repaired for a flat rate of $1 per unit. Meissner Mfg. Co., Mt. Carmel, 111.— Radio Today. ATR vibrators •k Line of replacement vibrators with 3/16 diameter tungsten contacts. Perforated reed of Swedish spring steel. Highly-efficient magnetic circuit. Mica and metal stack spacers. Vibrator replacement chart available on request. American Television & Radio Co., 300 E. 4th St., St. Paul, Minn. — Radio Today. Portable amplifier * Sound system with 2 mike inputs and 1 phono input. Separate gain controls permit mixing. Bass tone control peaking at 100 cycles, treble peaks at 7,000. Volume indicating meter. Illuminated dial calibrated in decibels. 12-inch p.m. speaker in peri-dynamic baffle. Attractive leatherette carrying case. Universal Microphone Co., Inglewood, Cal. — Radio Today. Communications receiver * 8-tube receiver with r.f. amplifier on all band. Ceramic coil forms. Electrical band spread — crystal filter. Tunes 540-43,000 KC. in 4 bands. Model 438, Howard Radio Co., 1735 Belmont Ave., Chicago, 111. — Radio Today. Ultra-sensitive relay ■*■ Microtrol relay with weatherproof case. Input relay operates on 2 microamperes. Contacts of power relay will handle 5 amps. AC on non-inductive circuit. Plug-in type glass case houses sensitive relay, power relay, and clock motor. Weston Electrical Instrument Corp., 614 Frelinghuysen Ave., Newark, N. J. — Radio Today. 28 Radio Today