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ID = 31650
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Tube type:  Half-Wave Rectifier, inert gas filled   Power-supply 
Identical to ESU103
Similar Tubes
Multiple differences or of other kind:
  ESU104 ; ESU105
First year Nov.1960 - - Manufacturers Literature

Base UV-Base (4 Pins+Bayonet, USA 1914 WE) Top contact with a cap
Filament Vf 2.5 Volts / If 5 Ampere / Direct / Parallel, (AC/DC)

<10kV pk. <1A pk; 0.25A mean. Xenon Filled

Information source - - Manufacturers Literature   
ESU103: orig. data sheet
Michael Schlör

ESU103: orig. data sheet
Michael Schlör

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