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Three JJ Electronics ECC83s/12AX7
It has a relatively quiet low frequencies, a warm middle and well articulated tops. In general, the sound is much more diverse and musical in comparison with the Russian varieties of 12AX7, produced by defense plants. Besides, unlike the lamps of old production (under the Tesla brand), Along with increasing the coefficient of amplification of the lamp, the engineers managed to minimize the so-called microphonic effect (the sound of the cell from the vibrations of the body), which Chinese manufacturers can not boast of.