Very rare vintage matched pairs of 6J1P (6Ж1П) from manufacturer Svetlana (St. Petersburg). Fully tested with the L3-3 (Л3-3) precise tube tester. Tubes were originally designed for mil. applications. OTK stamp. They have characteristic D-shaped getter. These tubes are nowadays really hard to get, especially in the offered new old stock quality. They offer exceptionally beautiful and detailed sound. So if you own any of the chinese amps which does have the 6J1 tubes inside, do not hesitate to upgrade it with these Svetlana tubes. Year of production: 1961. Gold plated grid. OTK stamp. The pairs will come really nicely matched, within 3% tolerance. And finally they are also audio tested directly in the Little Dot MK2 amp, so they are prepared for immediate usage in your device.
