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ID = 28840
United States of America (USA)
Brand: RCA (RCA Victor Co. Inc.); New York (NY)
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Transmitting Triode, air cooled   Power/Output 
Identical to UV203 = C303 = 203_Power
First year Apr.1921 Saga of the Vacuumtube, Tyne page 150, 325, 326
Predecessor Tubes U_Pliotron  
Successor Tubes 1923   UV203A   203A_Power  

Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 6.5 Ampere / Direct

Output 50 Watts at 1000 V and 150 mA at the plate. Amplification constant = 15. Price $ 30.-;
A single tube can put 2.5 to 3 Amps in the amateurs aerial. RCA claimed high uniformity to permit parallel operation of several tubes to generate large antenna currents.

The tube could be operated on batteries but a/c-d/c was preferable. The companion rectifier is the UV217.

The type no UV203 was registered by RCA as a radio tsde mark with the US Government on 6th June 1922, being allocated no 155805.

Dimensions (WHD)
incl. pins / tip
51 x 191 x 51 mm / 2.01 x 7.52 x 2.01 inch
Tube prices 2 Tube prices (visible for members only)
UV203: KoBi
Konrad Birkner † 12.08.2014

UV203: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

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