Quality russian double triodes 6N23P (6H23П), direct replacement for the ECC88 and 6DJ8 tubes. Tubes are tested and measured on the L3-3 tube tester. Pairs are coming out of 100 tested tubes from the industrial box. Will be delivered in modern white boxes. Labels with measured parameters (plate current and transconductance) are included. Manufacturer: Voskhod, Kaluga. Year of production: 1982.