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SG305K (СГ305К) is a soviet corona discharge tube in a metal-ceramic design, which was designed to stabilize high-voltage DC in electronic equipment. Stabilized voltage in the working current range is 10±0,5kV. Working current range: 50...1500µA. Works in any position. Weight: max. 200g. Service life: not less than 1000 operating hours. New in box, directly from the old reserves, original datasheet included. Year of production: 1984 (please look at the gallery pictures).