Quality 6C4P-EV (6Ц4П-ЕВ) tubes. Equwalent to the EZ90 / 6Z31 / Shuguang 6Z4 The lot is for 4 tubes. The tubes are never used. New in factory boxesThe original . rectifier in place of cheap chinese 6z4. Use the original not the copy. High quality NOS rectifier tubes. Direct replacement for Chinese 6z4- (not the American 6z4). Upgrade and improve your amplifier. “REFLECTOR” PlantSame Date Code 02-1998Tubes have “OTK” and markings on themHigh reliability. Long life non less 5,000 Hours!!!We combine multiple items to save on shipping! Shipping and HandingBuyer pays fixed shipping costs including insurance for any country. Shipping costs for this item can be found in the section Shipping and Payments. This item will be shipped to you from Europe (Ukraine) by Registered Airmail after payment is received and verified….