VU 1930
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Since 1930, the universal rectifier VU produced the Leningrad Kazitsky Plant. Rectifier "WU" when powered from AC mains provides an adjustable variable filament voltage of 1.4 and 4 volts and a constant anode voltage from 100 to 250 volts. Rectifier has become a modernization of the model "LV-2".
Documentation:
Information from collection of Valery Khartchenko