Russian double triode 6N8S (6H8C) was 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 1000 operating hours. All tubes were tested and have the same date code (0285). Manufacturer: Nevz, Novosibirsk. New in box..