The new version of my amplifier is much better. It has more neutral distortion and really nice classical voice. To achieve these targets I've completely redesigned the scheme. Useless stuff was removed, all parts of the scheme were tuned finely:
The inductance of coils in power supply could be just 2H.
6N1P (ECC82) tubes can be replaced with 6N14P (ECC84) (Ua = 100 V, Ia = 7.0 לְ, Ug = -1.5 V, Note: another pinout!), 6P6S or 6P1P tubes can be used instead of 6V6. Never use 6P1P-V or 6P1P-EV tubes here - they have less perfect voice.
The amplifier works fine. I can listen various music and enjoy. J.S. Bach, Messiaen, Led Zeppelin, Shnitke, Boulez, Shumann and so on.....
Now I'm trying to make a good loudspeakers.
Thanks to all the people who helped me :)