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BU250/7

Information - Help 
ID = 57637
       
Country:
Great Britain (UK)
Brand: Ediswan, Siemens Edison Swan Electric Co.; London
Tube type:  Current Regulator, Iron in Hydrogen 
Identical to BU250/7

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament
Information source - - Manufacturers Literature   december 1948
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Just Qvigstad
bu180-5_250-7data_5.png
BU250/7: own collection
Peter den Boer

 

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