Matched pair of double triodes 6N1P (6H1П). This is the basic version from the wider 6N1P family without any additional improvements. 6N1P tubes are direct replacement for the chinese 6N1 and they do offer 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 about 365 mA. In some cases a direct replacement without any discussion with the manufacturer may end up with damaging of your equipment. Please discuss this with the manufacturer of the equipment. Manufacturer: Orzep, Orel. Year of production: 1982.