6N13S (6H13C) is a double triode, which was originally designed for operation in electronic stabilizers. It is direct replacement for the 6AS7G and also soviet 6N5S (6H5C) - mil. spec. version of the same tube. Service life guarantee: ~ 1000 operating hours. Maximum weight: 90 g. New old stock tubes, directly from the old reserves. Made in the Svetlana, St. Petersburg factory. Year of production: 1964.