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ID = 25713
Tube type:  Triode, vacuum 
Identical to REN904/A = A4110_4pin
Similar Tubes
Different connections:

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 Sidecontact.
Filament Indirect
Information source - - -   
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REN904/A: Röhrensammlung
Wolfgang Bauer

REN904/A: Telefunken Werkstattbuch
Wolfgang Bauer


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