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ID = 67234
Great Britain (UK)
Brand: Marconi Scientific Instrument Co. LTD.,The; London
Tube type:  Triode, vacuum   Universal 
  <1925 very rare. ***
Identical to R4B_Marconi = R4B_BTH = R4B_MO

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / Direct / Battery =

The R4B was first made in 1918 and had an E12 base. In the following years, this was changed to B4. The date of the changeover is uncertain.

Dimensions (WHD)
incl. pins / tip
x 86 x 50 mm / x 3.39 x 1.97 inch
Weight 33 g / 1.16 oz
Information source -- Original prospect or advert   as per advert in
British Radio Valves - The Vintage Years, Thrower   Pages 26, 40 and 122
Saga of the Vacuum Tube, Tyne

b4_1~~67.png R4B_Marconi: Fin Stewart
Fin Stewart

Just Qvigstad

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