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ID = 28855
United States of America (USA)
Brand: DeForest-Tubes
Developer: General Electric Co. (GE); Bridgeport CT, Syracuse NY 
Tube type:  Transmitting Triode, air cooled   Power/Output 
Identical to 503A = C303 = UV203A

Base Jumbo 4-pin bayonet
Was used by Transmittertube (Radio)
Filament Vf 10 Volts / If 3.25 Ampere / Direct

50W Transmitting tube. Oscillator, RF amplifierand Class "B" modulator. Normal plate voltage 1250 at 125mA current..

Dimensions (WHD)
incl. pins / tip
x 220 x 64 mm / x 8.66 x 2.52 inch
Information source Vintage Radio 1887-1929, Greenwood's Classic Pictorial Album   
- - Manufacturers Literature   1933 Lafayette radio catalog.
  503A: RCA de forest
Günter Kudicke
503A: aus ebay, Verkäufer k8pyd
Gottfried Silberhorn

503A: ARRL Handbook 1972
Michael Schlör

503A: DeForest DataSheet
Franz Scharner

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