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ID = 20023
Brand: Radio-Record - Röhrenmarke; Holland
Developer: Radio-Record - Röhrenmarke; Holland 
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to M400
Similar Tubes
Normally replaceable-slightly different:
  B406 ; L306 ; P410 ; RE114
First Source (s)
16.Oct.1925 : Radio-Expres, Netherlands

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 4 Volts / If 0.1 Ampere / Direct / Battery =
Dimensions (WHD)
incl. pins / tip
42 x 92 x 31 mm / 1.65 x 3.62 x 1.22 inch
Weight 39 g / 1.38 oz
Literature - - Manufacturers Literature   
M400: Sammlung EE
Ernst Erb

M400: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

M400: own collection
Peter den Boer

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