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M604

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ID = 11353
       
Country:
Netherlands
Brand: Radio-Record - Röhrenmarke; Holland
Tube type:  Vacuum Pentode   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to M604
Similar Tubes
Normally replaceable-slightly different:
  C453 ; PP430

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Foo)
Filament Vf 4 Volts / If 0.3 Ampere / Direct / Battery =
Description To avoid the Philips penthode patent, Tungsram and Radio Record used a special constructed tetrode with penthode characteristics. See the other basinf diagrams. Also with B4 base + sidecontact. 
Literature Taschenbuch zum Röhren-Codex 1948/49   
 
m604_so.png
M604: rtt
Michael Schlör

 
m604.png
M604: own collection
Peter den Boer


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