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ID = 25439
Brand: Common type Japan tube/semicond.
Tube type:  LOCKED OFF PART (CODE 9) - see in Notes   RF/IF-Stage   Controlling (mu) 
Identical to US-6K7 = 6K7 = US6K7

Base Octal (Int.Octal, IO) K8A, USA 1935

Refer to US6K7.

Information source Babani, International Radio Tube Encyclopaedia   

374_32.png US-6K7: Telefunken Werkstattbuch
Wolfgang Bauer

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