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A_BTH

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ID = 28366
       
Country:
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 Vacuumtube, Tyne Seite 227

Filament Vf 4 Volts / If 0.72 Ampere / Direct / Battery =
Literature Saga of the Vacuumtube, Tyne   
British Radio Valves - The Vintage Years, Thrower   
 
b4_triode~~1.png
A_BTH: Fin Stewart
Fin Stewart

 

Usage in Models 1= 1920

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

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