How to get rid of self-excitation and distortion of the op-amp?

Question

Electronics

Assembled the scheme

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I accidentally discovered that if you connect a cord to the output, 15 centimeters, then you can cook scrambled eggs on the amplifier (tpa6120), while there is also some heating on the operational amplifier. In addition, the output is too high distortion (0.6% with op-amp, 0.38 without). Self-excitation occurs in both cases.

All this is powered by a half-wave (on one diode) rectifier, through a linear stabilizer (7819 + 7912). There are traces of rosin on the board. The sound card itself is VERY noisy.
PS: Will this execution be correct:

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Answer 1

The problem seems to have been resolved. I corrected the self-excitation with ski ointment (10kΩ resistor), the distortion was not from the amplifier, but from the DAC chip connected to the op-amp. Hand applause in the face. I also found out that the sound card itself gives distortion under a load of 1 kOhm. So thank you all for your answers, especially Vladimir Kozhevin