Russian double triodes 6N8S (6H8C) were designed for amplification of low-frequency voltage, but its usage is really universal. It is direct replacement of the 6SN7, 6SN7GT and also 6CC10 tubes. Original service life guarantee: more than 2000 operating hours. Pairs were selected from a higher amount of measured tubes. Will be delivered with measured parameters attached. Manufacturer: Nevz, Novosibirsk. Year of production: 1978. (please see the gallery).