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503A

Information - Help 
ID = 28855
       
Country:
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
Description

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
Literature Vintage Radio 1887-1929, Greenwood's Classic Pictorial Album   
- - Manufacturers Literature   1933 Lafayette radio catalog.
  203_a_503_a_sch.png
  503A: RCA de forest
Günter Kudicke
 
rca_503a.jpg
503A: aus ebay, Verkäufer k8pyd
Gottfried Silberhorn

 
503a_so.png
503A: ARRL Handbook 1972
Michael Schlör

 
deforest_503a.png
503A: DeForest DataSheet
Franz Scharner


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