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40G

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ID = 17990
       
Country:
Germany
Brand: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Tube type:  Current Regulator, Urdox with FeH 
Identical to 40G

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=E)
Filament
Information source Taschenbuch zum Röhren-Codex 1948/49   


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