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ID = 72874
United States of America (USA)
Brand: DeForest-Tubes
Tube type:  Half-Wave Mercury-Vapor Rectifier   Power-supply 
Identical to 572 = 872 = UV872 = FG19

Base Jumbo 4-pin bayonet Top contact with a cap.
Filament Vf 5 Volts / If 10 Ampere / Direct
Information source Radio Engineering   
- - Manufacturers Literature   
572: Electronics April, 1930
Achim Dassow


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