Electron tube SG2P (СГ2П) is a voltage regulator 108±4V. Allowed current range: 5 to 30mA. Operating temperature range: from from -60°C to +90°C. SG2P does not havy any know replacement. Service life guarantee: not less than 1000 operating hours. New old stock tubes, directly from the factory packing. Year of production: 1982-1983.