Offered here is a premium matched quad lot of 4 vintage ZAERIX CV575 / 5U4G full-wave rectifier valves, production dated to the 1960s. Russian-manufactured and beautifully labeled under the historic British Zaerix brand, these tubes feature an elegant , robust Grey Plates, a Black Base, and a premium Bottom Double Plate Getter construction.

This entire batch has been comprehensively analyzed on the Amplitrex AT1000 digital tester. Following our meticulous percentage evaluation, the metrics below show how each independent plate performs relative to the 100% factory specifications (FWD = 29 / REV = 403).