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ID = 17766
Great Britain (UK)
Developer: MO Valve Co. Ltd.; GB 
Tube type:  Triode, vacuum   Power/Output 
  Ca. 1925 up to 1945 rare.
Identical to LS6A = CV3541
Similar Tubes
Other base:
First year Oct.1928 - - Manufacturers Literature Date of Marconi Publication No. 520A.
First Source (s)
1929 : The Saga of Marconi Osram Valve p. 100, 101, 144 & 330
Predecessor Tubes LS6  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 6 Volts / If 1.6 Ampere / Direct / Specified voltage AC/DC

Power output triode. Mu 2.5; 25W anode dissipation; up to 62.5mA anode current into 1350 ohms load, with 400V anode voltage and 128V negative grid bias. "Carburised" filament

A later, improved version has a filament current of 2A. Also available with American style UX base

Dimensions (WHD)
incl. pins / tip
62 x 145 x mm / 2.44 x 5.71 x inch
Information source History of the British Radio Valve to 1940   p. 147 & 171
Babani, International Radio Tube Encyclopaedia   p. 118 & 119
- - Manufacturers Literature
Taschenbuch zum Röhren-Codex 1948/49

b4_base_pins~~53.png LS6A: Fin Stewart
Fin Stewart

Just Qvigstad
LS6A: osram wireless guide 1931
Giuseppe Antonio Tusini

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