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X73M

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ID = 31911
       
Country:
Great Britain (UK)
Brand: Osram-Valves GB (not MO-Valves)
Developer: Osram-Valves GB (not MO-Valves) 
Tube type:  LOCKED OFF PART (CODE 9) - see in Notes   Frequency converter   Controlling (mu) 
Identical to X73M
First Source (s)
1940 : - - Manufacturers Literature

Base Octal (Int.Octal, IO) K8A, USA 1935
Description See X73. Although only supplied with metallised finish, manufacturer's literature only refers to X73 not X73M. 
Information source Taschenbuch zum Röhren-Codex 1948/49   
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