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ID = 9372
Great Britain (UK)
Brand: Marconi-Osram - (Valves/Tubes); GB
Tube type:  OCTODE   Frequency converter 
Identical to X21

Base British-7-Pin, old (M7A) (Codex=Nto) Top contact with a cap.
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.1 Ampere / Direct / Battery =
Information source Taschenbuch zum Röhren-Codex 1948/49   
  X21: Osram Valves, Radio season 1936-1937
Dirk Bladt
X21: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

X21: Osram Valves, Radio season 1936-1937
Dirk Bladt

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from Just Qvigstad

Usage in Models 3= 1934 ; 2= 1935? ; 2= 1935 ; 3= 1936 ; 1= 1937? ; 3= 1937

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):14

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