COLLECTION OF HISTORIC EQUIPMENT AND COMPONENTS
UNDER CONSTRUCTION !
The AUDION versions of Lee de-Forest have been improved by RCA with a more reliable tube, the UV201. UV= is the UV type base, 2=is RCA. It was with Tungsten filament and amplification factor of 8. The filament power was 5 Watts (5V 1A). The filament power for a battery operated 5 tubes TRF receiver of the 1920's, required 25 Watts with UV201 tubes.
To reduce the filament power, RCA developed the UV201A, in which the filament was coated with oxide. This increased the electrons emission tremendously. The filament current was reduced in the UV201A to 0.25A and it became the most popular Triod in the TRF radios of the 1920's. Other manufacturers marked their UV201A versions with their prefix, ending with 01A.
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CONSTRUCTION WITH VACUUM TUBEs
Hobyists and radio amateurs that constructed Home Brew vacuum tubes receivers and transmittrers, required tools for producing the metal chassis.
The main problem was drilling the large holes for the tube sockets. The Socket Punch Set in the pictures is one of the popular sets in the 1950's.
5Z4G 6K6G DH63 (6Q7G) 6K7G 6K8G
NIXIE TUBE VALVO ZM1022
NEON 7 SEGMENT DISPLAY TUBES