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Vintage and quality soviet double triodes 6N8S (6H8C) with big square getter were designed for amplification of low-frequency voltage, but its usage is really universal. It is direct replacement of the 6SN7, 6SN7GT, 6CC10 tubes and close with the characteristics to the legendary 1578. Original service life guarantee: more than 2000 operating hours. Pairs were selected from a higher amount of measured tubes. New in box tubes with original datasheet, will be delivered with measured parameters attached. Manufacturer: Foton (Tashkent). Years of production: 1957 and 1959 (please look at the gallery pictures).