Double triodes 6N2P-EV (6H2П-EB) are 6N2P tube modifications with extended lifetime (not less than 5000 hours) and improved reliability. Close by characteristics to the 12AX7, ECC83, E83CC. 6N2P-EV tubes are a replacement for 12AX7 in any typical amp application, but they have 6.3V heater voltage and would need a different wiring than stock 12AX7's, so it is not a direct replacement. Tubes are unused - from the factory packing and selected from a higher amount of tested tubes. Made in 1975 and 1976 in the VOSKHOD - Kaluga factory. Highest quality. OTK stamp. Will be delivered in modern white boxes.