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20-400

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ID = 51655
       
Country:
Netherlands
Brand: Thermion; Lent (Nijmegen)
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to 20-400
Similar Tubes
Normally replaceable-slightly different:
  T78_Record
Production stop Feb.1938

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 7.5 Volts / If 1 Ampere / Direct / Specified voltage AC/DC
Description This is a tube from the Thermion Technica series of power amplifiers and power rectifiers. 
Information source - - Manufacturers Literature   1-9-1935

1_26~~3.png 20-400: Telefunken Werkstattbuch
Wolfgang Bauer


Just Qvigstad
20400data.png
20-400: own collection
Peter den Boer

 

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