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ID = 25263
Brand: Telefunken Deutschland (TFK), (Gesellschaft für drahtlose Telegraphie Telefunken mbH
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  OCTODE   Frequency converter   Controlling (mu) 
  Late but no serial production. For instance only development samples. *****
Identical to BK1
Similar Tubes
Heater different:
First year Mar.1934 Tube leaflet collection E.Erb Analysis by original leaflets
First Source (s)
Feb.1934 : -- Original-techn. papers.
Successor Tubes 1934   CK1  

Base Europe 7-Pin C7A (Hx C, C7, C) 1933 Top contact with a cap.
Filament Vf 15 Volts / If 0.18 Ampere / Indirect / Specified current DC = (Series working)
Description Diese Röhre war bei Telefunken nur geplant. Ob Prototypen exististieren, ist nicht bekannt. Quelle: Internes Material von Telefunken, Berlin 1934. 

hx6~~1.png BK1: RTT 1974 (Franzis) 13. Auflage
Martin Renz

Just Qvigstad

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