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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 = PR-3A
Similar Tubes
Normally replaceable-slightly different:
  PR-3-A ; R203-D
First year Apr.1921 Saga of the Vacuum Tube, Tyne page 150, 325, 326
Predecessor Tubes U_Pliotron   CG-1144A  
Successor Tubes 1923   UV203A   203A_Power  

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

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 November 1920. It was announced to the public in March 1921.

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 3 Tube prices (visible for members only)
Information source - - Manufacturers Literature   Development of Radiotrom transmitting tubes to 193
Saga of the Vacuum Tube, Tyne   p. 150, 325 & 326
Tube Lore (II)

jumbo_4_pin_transmitting_base~~2.png UV203: Fin Stewart
Fin Stewart

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

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