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ID = 28406
Great Britain (UK)
Brand: BTH (B.T.H.), British Thomson-Houston Co, Ltd.
Tube type:  Triode, vacuum 
Identical to B_BTH = G_Moorhead
Similar Tubes
Different maximum ratings:
  R_England ; TM
First year 1918 ? Saga of the Vacuumtube, Tyne Seite 227

Base Europe 4-Pin (A, 4A, B4, since 1914)
Filament Vf 4 Volts / If 0.72 Ampere / Direct / Battery =
Description When used as a transmitting valve, the filament got 6 Volt and the anode up to 800 Volts. 
B_BTH: rtt
Michael Schlör


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