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JJ Electronics 12AX7 / ECC83
A modern high-performance low-noise tube with relatively high gain, with a strong sound across the entire range. The lamp shows itself well both on clean sound, and on overdriven sound.
They are mainly low frequencies, warm middle and well articulated top. In general, the sound is much more expressive and musical compared to the Russian varieties 12AX7, which are produced by defense plants. Besides, unlike the old production lamps (under the Tesla brand) the engineers managed to minimize the amplification of the lamps, the so-called microphonic effect (the ringing of the battery from the vibrations on the body), which Chinese manufacturers can not boast about.