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ID = 51657
Brand: Thermion; Netherlands
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to 25-550
Similar Tubes
Normally replaceable-slightly different:
  F410 ; T114
Production stop Feb.1938

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 4 Volts / If 2 Ampere / Direct
Description This is a tube from the Thermion Technica series of power amplifiers and power rectifiers. 
Information source - - Manufacturers Literature   1-9-1935
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1_31~~1.png 25-550: Telefunken Werkstattbuch
Wolfgang Bauer

Just Qvigstad
25-550: own collection
Peter den Boer

Collection of



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