High quality russian double triodes 6N23P-EV (6H23П-EB), direct replacement for the 6922 and E88CC tubes. Enhanced reliability, extended life service (more than 5000 operating hours). Tubes are tested and measured with the L3-3 tube tester, matched in pairs. Tubes will be delivered in modern white boxes with measured parameters attached. Manufacturer: Reflektor, Saratov. Years of production: 1977 and 1978. New old stock.