British-7-Pin, old (M7A) (Codex=Nc)
Top contact with a cap.
Utilizzata per
Radio/TV-reception etc.
Filamento
Vf 13 Volt / If 0.3 Ampere / Indirect
Bibliografia
The Saga of Marconi Osram Valve p. 335
History of the British Radio Valve to 1940 p. 148 & 196
Babani, International Radio Tube Encyclopaedia
Taschenbuch zum Röhren-Codex 1948/49