6N1P-EV + 6P1P-EV ( 2 Matched Pairs) set for upgrade LISTON 12 NOBSOUND MS Amps
2 MATCHED PAIRS - tubes has identical electrical characteristics. Lot of 2 pcs NEW 6N1P-EV Voshod tubes + 2 pcs NEW 6P1P-EV Svetlana tubes. 4 tubes in 1 lot. Accuracy of selection is 5%. 1982 and 6P1P-EV 05.1985.