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SG304S (СГ304C) is a vintage soviet corona discharge hydrogen filled tube, which was designed to stabilize high-voltage. Stabilized voltage in the working current range is 4±0,2kV. Working current range: 50...1200µA.Weight: max.100g. Service life: not less than 1000 operating hours. New in box, directly from the old reserves. Year of production: 1982 (please look at the gallery pictures).