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ID = 28418
Great Britain (UK)
Brand: BTH (B.T.H.), British Thomson-Houston Co, Ltd.
Tube type:  Triode, vacuum   Power/Output 
Identical to B12
First year 1927 Saga of the Vacuum Tube, Tyne Seite 390
First Source (s)
1927 : British Radio Valves - The Vintage Years, Thrower p.47

Filament Vf 7.5 Volts / If 1.25 Ampere
B12: Collection Philippe Richard
Patrice Zeissloff

B12: Miniwatt Livret de comparaison
Patrice Zeissloff

Usage in Models 1= 1929?

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

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