Russian miniature pentodes with low microphonics 6J32P (6Ж32П), direct replacement for the EF86, 6267, 6CF8 and 6BK8 tubes. Tubes are tested and measured on the L3-3 tube tester. Pairs are coming out of more tested new old stock pieces and will be delivered with measured parameters (plate current and transconductance) attached. Manufacturer: Svetlana, St.Petersburg. Dates of production may differ, but all of the available tubes were made in the 80's and early 90's.