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ID = 13727
Great Britain (UK)
Brand: Graham Farish Ltd.; Bromley
Developer: Graham Farish Ltd.; Bromley 
Tube type:  Triode, vacuum   Detector 
Identical to AC/DX

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=F)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Indirect
Information source L'ABCDaire des lampes de TSF des jeunes années   p. 81
Universal Vade-Mecum, Electron Valves and Semiconductor Devices   Section 102, p. 137
Taschenbuch zum Röhren-Codex 1948/49
British Radio Valves - The Classic Years: 1926-1946

s_6_g_3.gif AC/DX: W.Sprick: Austausch-Röhren-Lexikon 1947
Günther Stabe † 19.8.20

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