22.Nov.1935 : Wireless World (The), London (WW, 79)
Sockel
England-7-Stift, alt (M7A) (Codex=N)
Anwender
Radio/TV-Empfang etc.
Heizung
Uf 40 Volt / If 0.2 Ampere
Literatur
History of the British Radio Valve to 1940 p. 1444 & 189
Babani, International Radio Tube Encyclopaedia p. 16 & 17
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49