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ID = 20179
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Tube type:  Full-Wave Vacuum Rectifier   Power-supply 
Identical to U20_MOV = CV31
First Source (s)
1939 : The Saga of Marconi Osram Valve
Successor Tubes U18/20  

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Filament Vf 4 Volts / If 3.7 Ampere / Direct
U20_MOV: Eigenes Bild
Anonymous 740 Collector

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U20_MOV: rtt
Michael Schlör

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