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ID = 28845
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 UV216 = UV-216
First year Jul.1921 Saga of the Vacuum Tube, Tyne page 322, 323
Successor Tubes 1925   UV216A   UV216B   316B  

Base UV-Base (4 Pins+Bayonet, USA 1914 WE)
Was used by Transmittertube (Radio)
Filament Vf 7.5 Volts / If 2.35 Ampere / Direct / Specified voltage AND current AC/DC
Description Work started on development of this tube at the GE laboratories in 1920 and the type number was assigned to it in March 1921. It was announced to the public in October 1921. Use began in the following year. Being a rectifier, GE gave this tube the brand name "Kenotron" 
Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
x 132 x 54 mm / x 5.20 x 2.13 inch
Weight 69 g / 2.43 oz
Information source Saga of the Vacuum Tube, Tyne   p.322
- - Manufacturers Literature   Development of Rqadiotron transmitting tubes to 19
  UV216: "The Radio Industry. The Story of Its Development", Chicago & New York, 1928; p. 260
Karl Dilcher
UV216: own collection
Peter den Boer

More ...
UV216: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

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