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ID = 28501
Great Britain (UK)
Brand: Economic Electric; London
Tube type:  Triode, vacuum   Universal 
Identical to Dex235
First year 1926 Saga of the Vacuum Tube, Tyne Seite 388
First Source (s)
1925 : British Radio Valves - The Vintage Years, Thrower p.50

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 2 Volts / If 0.35 Ampere / Direct / Battery =
Description General name "Dextraudion". 
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