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ID = 19664
Great Britain (UK)
Brand: Ferranti, GB
Tube type:  Triode, vacuum   Power/Output 
Identical to LP4_Ferranti = 4XP = PX4

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1 Ampere / Direct / Specified voltage AC/DC
Information source - - Manufacturers Literature   
History of the British Radio Valve to 1940   p. 172
  LP4_Ferranti: Ferranti Valves, List Wb. 560
Achim Dassow
LP4_Ferranti: Ebay UK auction item 272636140796 kreed-uk
Howard Craven

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LP4_Ferranti: rtt
Anonymous 10 Collector

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LP4_Ferranti: Ferranti Valves List Wb. 560
Achim Dassow

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