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6N5S (6H5C) is a soviet double triode, which was originally designed for operation in electronic stabilizers. It is direct replacement for the american 6AS7G and equivalent soviet type 6N13S (6H13S). New old stock tubes in original boxes (boxes already do have some marks of longer storage). All of the available pieces are also tested! Original datasheet is in the attachment. Manufacturer: Svetlana, St. Petersburg. OTK stamp. Years of production: 1967-68 (please look at the gallery pictures).