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520B

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ID = 17008
       
Country:
United States of America (USA)
Brand: DeForest-Tubes
Developer: DeForest-Tubes 
Tube type:  Transmitting Triode, air cooled   Power/Output 
Identical to 520B
Similar Tubes
Differences not known by us:
  820B

Was used by Transmittertube (Radio)
Filament Vf 22 Volts / If 34 Ampere / Direct
Description

5000 watt Oscillator, RF amplifier and modulator, water cooled.

 
Information source Taschenbuch zum Röhren-Codex 1948/49   August 1930, page 17
Radio Engineering   

 

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