High quality russian double triode 6N23P-EV (6H23П-EB), direct replacement for the 6922 and E88CC tubes. Enhanced reliability, extended life service (more than 5000 operating hours) and low microphonics. New old stock tubes, directly from the factory packing. Tested and will be delivered in modern white boxes. Manufacturer: Reflektor, Saratov. Years of production: 1977 and 1978.