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ID = 28414
Great Britain (UK)
Brand: BTH (B.T.H.), British Thomson-Houston Co, Ltd.
Tube type:  Triode, vacuum   Universal 
Identical to B2_BTH
First year 1923 Saga of the Vacuumtube, Tyne Seite 389
First Source (s)
1923 : British Radio Valves - The Vintage Years, Thrower p.28

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 5 Volts / If 0.7 Ampere / Direct / Battery =

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