1934 : History of the British Radio Valve to 1940 p. 146 & 189
Base
British-7-Pin, old (M7A) (Codex=Nh)
Top contact with a cap.
Usada en
Radio/TV-reception etc.
Filamento
Vf 4 Volt / If 2 Ampere / Indirect
Descripción
Pa <8W, 2.5W output into 6500 ohms.
Literatura
Babani, International Radio Tube Encyclopaedia p. 130 & 131
Wireless World (The), London (WW, 79) Data Nov 1934
Universal Vade-Mecum, Electron Valves and Semiconductor Devices
Taschenbuch zum Röhren-Codex 1948/49
