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ID = 28417
Great Britain (UK)
Brand: BTH (B.T.H.), British Thomson-Houston Co, Ltd.
Tube type:  Triode, vacuum   Audio Frequency 
Identical to B8
First year 1924 Saga of the Vacuum Tube, Tyne Seite 390
First Source (s)
1926 : British Radio Valves - The Vintage Years, Thrower p.47

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 2.8 Volts / If 0.12 Ampere / Direct / Battery =
Description Advertisement by BTH in March 1927 announces the B8 as a new valve. It seems unlikely that Tyne's date of 1924 is correct, at least as regards availablity.

Designed for use in RC coupled ampliers.
Filament range is 1.8 to 2.8 volts
Filament current is 0.12A at 2.8V
Ra is 180k ohms at Va of 150, with an amplification factor of 50. 

Information source - - Manufacturers Literature   Advertisement in WW March 16 1927
Roy Johnson


from Just Qvigstad

Usage in Models 1= 1927

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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