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ID = 28406
Great Britain (UK)
Tube type:  Triode, vacuum   Text 
Identical to B_BTH = G_Moorhead
Similar Tubes
Normally replaceable-slightly different:
Different maximum ratings:
  R_England ; TM
First year 1918 ? 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 =

When used as a transmitting valve, the filament got 6 Volt and the anode up to 800 Volts.

Dimensions (WHD)
incl. pins / tip
x 118 x 55 mm / x 4.65 x 2.17 inch
Information source British Radio Valves - The Vintage Years: 1904-1925   Pages 28 & 78
Saga of the Vacuum Tube, Tyne   Pages 227 & 228

b_bth_so.png B_BTH: rtt
Anonymous 10 Collector

Just Qvigstad

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