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ID = 28848
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 UV217 = 217_RCA
Similar Tubes
Other characteristic (electr. data):
  UV217A ; UV217B ; UV217C
First year Mar.1927 Saga of the Vacuum Tube, Tyne page 323
First Source (s)
1924 : Saga of the Vacuum Tube, Tyne p.323
01.Jun.1922 : RCA Catalog June 1, 1922
Successor Tubes 1921   UV217B   UV217C   UV217A  

Base Jumbo 4-pin bayonet (1918)
Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 6.5 Ampere / Direct / Specified voltage AC/DC

Work started on development of this tube at the GE laboratories in the Spring of 1920 and the type number was assigned to it in June 1921.It was released to the public on October 1921. The base insulation on early tubes was a mica disc 50-Watt size tube, called Kenotron Rectifier.
DC output 150 W at 1000 V DC.

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
51 x 191 x 51 mm / 2.01 x 7.52 x 2.01 inch
Weight 185 g / 6.53 oz
Information source - - Manufacturers Literature   Development of Radiotron transmitting tubes to 193
Saga of the Vacuum Tube, Tyne   p. 323
-- Collector info (Sammler)
Tube Lore (II)

uv217_so.png UV217
Anonymous 10 Collector

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Just Qvigstad
UV217: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

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