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ID = 28729
Great Britain (UK)
Tube type:  Triode, vacuum   Universal 
  <1925 rare.
Identical to R4C
First year 1919 ?? Saga of the Vacuum Tube, Tyne page 220
First Source (s)
1919 : British Radio Valves - The Vintage Years, Thrower p.26,27

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Military and/or Government
Filament Vf 3.8 Volts / If 0.65 Ampere / Direct / Battery =
Description First made by Osram GEC in 1919. Tube was fitted with E12 Edison base and had wire leads from the top from the plate and grid connections. British Navy version NR4C 
Dimensions (WHD)
incl. pins / tip
50 x 105 x mm / 1.97 x 4.13 x inch
Information source - - Manufacturers Literature   Gec cat. about 1924

b4_base_pins~~210.png R4C: Fin Stewart
Fin Stewart

Just Qvigstad
R4C: own collection
Peter den Boer


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