Double triode 6N1P (6H1П) is a direct replacement for the chinese 6N1 (Shuguang) tube and also offers a better performance. It may be also used as a replacement for the ECC88/6DJ8/6922 tubes. But you have to be careful, because there are some important differences. the 6N1P's are drawing considerably more heater current: about 600 mA, comparing to the ECC88/6922/6DJ8 tubes, where it is only about 365 mA. In some cases, direct replacement without any further discussion with the manufacturer, may end up with damaging of your equipment. Please discuss this with the manufacturer of the equipment. Service life is not less than 3000 operating hours. New old stock tubes, directly from the factory packing. Year of production: 1982.