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3121_OSW

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ID = 26000
       
Country:
Germany
Brand: Werk für Fernmeldewesen (OSW, HF, WF) Berlin, VEB, RFT (Ostd.)
Tube type:  LOCKED OFF PART (CODE 9) - see in Notes 
Identical to 3121_OSW = OSW3121
Similar Tubes
Normally replaceable-slightly different:
  AZ11

Base German Steel Y8A, 1938
Description Bezeichnung vom Hersteller: OSW3121 (siehe dort). 
Information source -- Original prospect or advert   
Taschenbuch zum Röhren-Codex 1948/49   Design = Telefunken
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