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M1004S

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ID = 50880
       
Country:
Netherlands
Brand: Radio-Record - Röhrenmarke; Holland
Developer: Radio-Record - Röhrenmarke; Holland 
Tube type:  Double Grid Power Amplifier   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to M1004S

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 Sidecontact.
Filament Vf 4 Volts / If 0.1 Ampere / Direct / Specified current DC = (Series working)
Description Tungsram and Radio Record made tetrodes with a penthode characteristic to avoid the Philips patent of the penthode. 
Information source - - Manufacturers Literature   1933
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j_5.png M1004S
Peter den Boer

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Just Qvigstad
m1004s.png
M1004S: own collection
Peter den Boer

 

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