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ID = 51619
Brand: Thermion; Netherlands
Tube type:  Screen-grid Tetrode 
  Ca. 1925 up to 1945 very rare. ***
Identical to B400
Similar Tubes
Normally replaceable-slightly different:
Production stop Feb.1938

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 4 Volts / If 1 Ampere / Direct / Specified voltage AC/DC
Description Used for class B amplification. Va = 400 Volt max, Vg = 0 Volt. Plate dissipation 12 Watt max. This tube is made as a Thermion Ultima 1936 B400 and as a Thermion Technica B400. The Thermion Technica series is a line of power amplifiers and power rectifiers. 
Information source - - Manufacturers Literature   1-9-1935
B400: own collection
Peter den Boer

from Just Qvigstad

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