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ID = 28415
Great Britain (UK)
Brand: BTH (B.T.H.), British Thomson-Houston Co, Ltd.
Tube type:  Triode, vacuum   Universal 
Identical to B4H
First year 1923 Saga of the Vacuumtube, Tyne 389
First Source (s)
1924 : British Radio Valves - The Vintage Years, Thrower p.45

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 6 Volts / If 0.25 Ampere / Direct / Battery =
Description Contrary to Tyne, Thrower states that although the B4H was announced in 1924, it was not generally available until end of 1926 or early in 1927.

Specified for use as a detector and HF amplifier.
Va range 60 to 150 volts, with an Ra of 28000 ohms and µ of 20. 
Text in other languages (may differ)

Literature - - Manufacturers Literature   Advertisement Feb 1927

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