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ID = 28366
Great Britain (UK)
Brand: BTH (B.T.H.), British Thomson-Houston Co, Ltd.
Tube type:  Triode, vacuum   Audio Frequency 
  <1925 rare.
Identical to A_BTH
Similar Tubes
Normally replaceable-slightly different:
  R_England ; TM
First year 1917 Saga of the Vacuum Tube, Tyne Seite 227

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.72 Ampere / Direct / Battery =
Dimensions (WHD)
incl. pins / tip
x 118 x 55 mm / x 4.65 x 2.17 inch
Information source Saga of the Vacuum Tube, Tyne   Pages 227 & 228
British Radio Valves - The Vintage Years: 1904-1925   Pages 28 & 113

b4_triode~~1.png A_BTH: Fin Stewart
Fin Stewart

Just Qvigstad
Usage in Models 1= 1920

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

Collection of



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