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ID = 46525
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Tube type:  Half-Wave Mercury-Vapor Rectifier   Power-supply 
Identical to ESU40

Base Edison giant, E40 = 40 mm-Goliat Top contact screw type.
Filament Vf 2 Volts / If 4 Ampere / Direct / Specified voltage AC/DC
Description <3kV rms. <0.5A pk. 
Dimensions (WHD)
incl. pins / tip
150 x 425 x mm / 5.91 x 16.73 x inch
Information source - - Manufacturers Literature   Advertisement Sept 1932
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edison_rect_10.png ESU40: Manufacturer's Literature
Emilio Ciardiello

Just Qvigstad

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