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ID = 28553
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Tube type:  Triode, vacuum   Universal 
Identical to ES1_Ediswan = R_England
First year 1916 ?? Saga of the Vacuum Tube, Tyne page 218
First Source (s)
1919 : History of the British Radio Valve to 1940 p. 155

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.7 Ampere / Direct / Battery =

Ediswan version of the "R".Also made with R type designation. Made in coventional spherical bulb and also a tapered version about 50 mm diameter

Dimensions (WHD)
incl. pins / tip
x 118 x 55 mm / x 4.65 x 2.17 inch
Tube prices 1 Tube prices (visible for members only)
Information source British Radio Valves - The Vintage Years, Thrower   Page 31
Saga of the Vacuum Tube, Tyne   Pages 217 & 218
-- Collector info (Sammler)
ES1_Ediswan: Ediswan ES1 Sold by Ebay Seller:kkksepix Ebay Item:112338110844 on 27 Mar 2017
Lindsay Shepherd

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ES1_Ediswan: rtt
Anonymous 10 Collector


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