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ID = 80779
Great Britain (UK)
Brand: Octron Ltd., Birmingham
Tube type:  Triode, vacuum   Audio Frequency 
Identical to L408

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 3.7 Volts / If 0.08 Ampere / Direct / Battery =

Rac 19.6kΩ, Ia2.1mA, gm 0.37mA/v at Vg=-3.0 and Va=80

Information source Wireless World (The), London (WW, 79)   Dec 1926

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