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

Base Europe 4-Pin (A, 4A, B4, since 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
Literature - - Manufacturers Literature   Gec cat. about 1924
R4C: own collection
Peter den Boer

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