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ID = 52148
Great Britain (UK)
Brand: GWI Ltd.; London
Developer: GWI Ltd.; London 
Tube type:  Triode, vacuum   Audio Frequency 
  <1925 very rare. ***
Identical to A1_plateless
First Source (s)
Jun.1924 : British Radio Valves - The Vintage Years: 1904-1925

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.58 Ampere / Direct / Battery =

G.W.I. Ltd. Imperial Works, Shanklin Rd., Crouch End, London, N8.
Valve repairers who produced an unusual valve in 1924.
Instead of a cylindrical anode the inner glass surface was silver coated to work as anode. Therefore called "plateless".

Information source British Radio Valves - The Vintage Years: 1904-1925   pages 4, 32, 116, 138

Just Qvigstad


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