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M64

Information - Help 
ID = 14479
       
Country:
Netherlands
Brand: Radio-Record - Röhrenmarke; Holland
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to M64
Similar Tubes
Normally replaceable-slightly different:
  C405 ; P430

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 4 Volts / If 0.3 Ampere / Direct / Battery =
Description Va=200 at Ia=25mA and -Vg=27, Gm=3 with amp factor=5 and Rint=3000. Modulator application. (Radio-Expres 1930) 
Information source Taschenbuch zum Röhren-Codex 1948/49   
Radio-Expres, Netherlands   
- - Manufacturers Literature
 
m64_sock.png
M64: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

 
m64.png
M64: own collection
Peter den Boer


from Just Qvigstad

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