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ID = 28851
United States of America (USA)
Brand: General Electric for Brand RCA-Radiotron; Bridgeport CT, Syracuse NY
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Half-Wave Vacuum Rectifier   Power-supply 
Identical to UV217C
Similar Tubes
Normally replaceable-slightly different:
Other characteristic (electr. data):
  UV217 ; UV217A ; UV217B
First year Jan.1927 Saga of the Vacuumtube, Tyne page 323
Predecessor Tubes UV217  

Base Jumbo 4-pin bayonet Top contact with a cap
Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 3.25 Ampere / Direct / Parallel, (AC/DC)
Description Work started on development of this tube at the GE laboratories in 1926 and the type number was assigned to it and It was also released to the public the same year. 
Text in other languages (may differ)
Literature - - Manufacturers Literature   Development of Radiotron transmitting tubes to 193
Michael Schlör


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