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ID = 56108
Great Britain (UK)
Brand: BTH (B.T.H.), British Thomson-Houston Co, Ltd.
Developer: DeForest-Tubes 
Tube type:  Triode, vacuum   Audio Frequency 
  <1925 very rare. ***
Identical to BTHAudion_E12

Base Edison (candelabra) 12 mm Other combinations of connections.
Was used by Military and/or Government
Filament Direct / Battery =
Description BTH logo on side of glass bulb. Filament volts 3.5 - 3.7. Filament current 1.1 amps. Plate voltage 20 - 50 
Dimensions (WHD)
incl. pins / tip
x 90 x 60 mm / x 3.54 x 2.36 inch
Weight 38 g / 1.34 oz
Information source British Radio Valves - The Vintage Years, Thrower   p.39
Saga of the Vacuum Tube, Tyne   p.215
BTHAudion_E12: Fin Stewart collection
Fin Stewart

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Usage in Models 1= 1917

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

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