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ID = 28844
United States of America (USA)
Brand: RCA (RCA Victor Co. Inc.); New York (NY)
Tube type:  Full-Wave Vacuum Rectifier   Power-supply 
  Late but no serial production. For instance only development samples. *****
Identical to UV213
Similar Tubes
Other base and data slightly different:
First year Dec.1923 Saga of the Vacuum Tube, Tyne page 324
Successor Tubes UX213  

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Description renamed for final base into UX213 
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