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ID = 30799
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 UV217A = 217A
Similar Tubes
Other characteristic (electr. data):
  UV217 ; UV217B ; UV217C
First Source (s)
Mar.1926 : Saga of the Vacuumtube, Tyne p.323
Predecessor Tubes UV217  

Base Jumbo 4-pin bayonet
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 March 1924 (?) and the type number was assigned to it in November the same year. It was released to the public in 1926. Being a rectifier, GE gave the tube the brandname: Kenotron. 
Literature - - Manufacturers Literature   Development of Radiotron transmitting tubes to 193
Michael Schlör


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