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Vintage soviet 6K4P-V (6К4П-В) is a high-frequency pentode of improved durability and reliability designed for HF voltage amplification. It is direct replacement for the chinese 6K4 (Shuguang) tubes, which are commonly used in many chinese made headphone amplifiers and it is also very similar to the EF93 and 6F31 tubes, but it has different connections. New in box tubes, directly from the old reserves (please look at the gallery pictures). Years of production: from 1964 to 1967. Tested.