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6K4P-EV (6К4П-ЕВ) is a high-frequency pentode with an extended characteristic designed for HF voltage amplification. High reliable and long life tube ( > 5000 hours, under prescribed conditons). 6K4P-EV is a 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 factory packing. Year of production: 1988.