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ID = 25265
Brand: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Tube type:  Double Triode   Power/Output 
  Late but no serial production. For instance only development samples. *****
Identical to HDD1
First Source (s)
Feb.1934 : -- Original-techn. papers.

Filament Vf 4 Volts / Direct / Battery =
Description Gegentakt-B-Verstärker. Der Kennbuchstabe H sollte ursprünglich für 4V-Batterieheizung stehen. Quelle: Interne Telefunkenunterlagen aus dem Jahr 1934. 


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