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ID = 28843
United States of America (USA)
Brand: RCA (RCA Victor Co. Inc.); New York (NY)
Tube type:  Triode, vacuum   Power/Output 
Identical to UV210 = 210_UV-Triode
First year 1924 Saga of the Vacuumtube, Tyne page 316, 317, 326
Successor Tubes UX210  

Filament Vf 7.5 Volts / If 1.25 Ampere
Description Initially being developed (start 1922) and employed as an output stage tube for loudspeaker operation(1924/25), it was also used in transmitting service by the Navy (1924 beginning), because of its long life of about 15,000 hours.
Power output 1.5 Watts. 

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