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ID = 80038
United States of America (USA)
Brand: RCA (RCA Victor Co. Inc.); New York (NY)
Developer: RCA (RCA Victor Co. Inc.); New York (NY) 
Tube type:  Half-Wave Mercury-Vapor Rectifier   Power-supply 
Identical to 1_RCA
Similar Tubes
Normally replaceable-slightly different:
  1-V ; KR1

Base UX-Base (4 Pins (2 thick, USA 1924, UX)
Was used by Radio/TV-reception etc.
Filament Vf 6.3 Volts / If 0.3 Ampere
Description RCA developed this tube in 1933 in answer to Ken Rad's KR-1. It was capable of supplying 50 mA and had a low voltage drop of 15 through the use of closely spaced elements. It was soon discovered that, in use the tube could not operate in certain weather conditions. In June 1933 RCA announced the 1v which had no mercury. 
Information source -- Collector info (Sammler)   

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