Offered here is an exceptional, lot of 4 vintage 6C33C-B high-current power triode valves, beautifully preserved and brand new in their original boxes. Manufactured to rigorous Soviet military standards, these robust tubes feature clear glass envelopes, premium top leaf getters, and heavy-duty black plates designed for high performance and thermal stability.

As clearly visible , each tube carries authentic factory ink stamps, including the highly desirable, distinctive “V” (winged symbol/quality sign) and diamond OTK inspection military logos. This matching historical batch is ideal for high-end audio amplification and demanding OTL amplifier designs.