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Ohmite rheostat
•k Continuous winding rheostat for connection to rotary antennas and other equipment for direction indicating. Model DR-125 designed for DC up to 24 volts. Ohmite Mfg. Co., 4835 Flournoy St., Chicago, 111. — Radio Today.
Sterling meters
•k A new line of pocket and panel meters for AC and DC, features loading-type portable battery tester which has plug-in tips mounted around the case for direct connection to socket. A and B units are tested at normal loads. Type 38A lists, $2.75. Sterling Mfg. Co., 9205 Detroit Ave., Cleveland, Ohio. — Radio Today.
Walsco scratch remover
k Designed like a fountain pen, new scratch remover tool has fillerstain in one end, and liquid stain in the other. Made of unbreakable plastic, device has usual pocket
SOUHD K/TRB TUBES
FOR HEAVY DUTY AUDIO WORK
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IN
AMPLIFIERS. PUBLIC ADDRESS SYSTEMS, SOUND PROJECTORS, INTER-OFFICE
COMMUNICATING SYSTEMS, COIN OPERATED REPRODUCER
Can Be Used to REPLACE ORDINARY TUBE OF SAME TYPE JVUMBER For Better Reproduction
The chief requirement for National Union's new SOUND X/TRA tube types is that they must be demonstrably better. In order to accomplish this outstanding performance In SOUND X/TRA types, modifications in construction and details of engineering were Incorporated. Emission limits are very high to insure exceptional uniformity, long life and adequate power-handling capacity. Gas and grid current are held to exceptionally low limits to insure minimum distortion, uniformity and stability. Every tube is carefully tested for hum and microphonics and, where necessary, changes have been made in construction such as the use of special micas, extra rugged supports, double helix heaters and special insulation.
DEMONSTRABLY BETTER
•••
NON-MICROPHONIC LOW-HUM LEVEL UNIFORM CHARACTERISTICS
NO MATCHING NECESSARY LONG LIFE AT FULL OUTPUT Ask Tour N.U. Jobber or Write
•••
inmonni
57 STATE ST., NEWARK, N. J.
SERVIC
clip. Walter L. Schott Co., 5264 W. Pico Blvd., Los Angeles, Calif. — Radio Today.
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Hickok signal generator
* Model 188-X wide band crystal controlled signal generator covers 100 kc to 133 mc. Electronic frequency modulation up to 750 kc. sweep at 400 cps. Variable audio output 50 to 10,000 cps. 100 and 1,000 kc. crystal frequencies. For 110 AC. Hickok Electrical Instrument Co., 10514 Dupont Ave., Cleveland, Ohio. — Radio Today.
GE test equipment
■k New line of radio service equipment includes two signal generators, oscilloscope, multimeter, tube tester, and capacity-resistance bridge. Bridge measures capacity from 2 mmfd. to 200 inf., resistance to 20 megs., power factor, transformer turn ardios, etc. General Electric Co., Bridgeport, Conn. — Radio Today.
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Eicor small motor
-k Tiny motor weighs 1% lbs., is 2%6 x 2% long. Delivers ^3 hp. at 8500 rpm. Designed for aircraft, bandswitching, antenna reels or any type of remote control. Eicor, Inc., 515 S. Laffin St., Chicago, 111. — Radio Today.
Raytheon tubes
• Types CK-505, and CK-505X pentodes for hearing aid use will voltage gain of 225 as resistance coupled amplifier with total B drain of 54 microamps, and A drain of 30 ma. at 1.25 volts (tubes in series). 505X type has tinned leads. Raytheon Production Corp., 55 Chapel St., Newton, Mass. — Radio Today.
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RADIO TODAY