Electron tubes 6N6P (6Н6П) are russian double triodes with anode dissipation of 2x4W. These tubes were designed especially for low frequency power amplification. 6N6P does not have any known direct american or european replacement, it is very similar to the ECC99, but it has different pinout!! Service life guarantee: 2000 operating hours. 6N6P is a direct replacement for the chinese 6N6 tubes and its military (6N6-T) versions, these are commonly used tubes in different headphone amplifiers coming from China. 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. New old stock tubes, directly from the factory packing. Manufacturer: Nevz, Novosibirsk. Year of production: 1982.