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ID = 28850
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 UV217B
Similar Tubes
Other characteristic (electr. data):
  UV217 ; UV217A ; UV217C
First year Dec.1926 Saga of the Vacuumtube, Tyne page 323
Predecessor Tubes UV217  

Base Jumbo 4-pin bayonet
Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 3.25 Ampere / Direct / Parallel / series AC/DC
Description Work n development of this tube at the GE laboratories started in October 1924 and the type number was assigned to it in December the same year. It is not known when the tube was released to the public. being a rectifier, GE gave this tube the Brandname: Kenotron 
Literature - - Manufacturers Literature   Development of Radiotron transmitting tubes to 193
Michael Schlör


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