Looking for NEC 575C2 2Watt Chip

I got a little battery operated guitar amp to repair.

This amp is based on a NEC 575C2 Chip and it seems to be blown (overheated?).

Unfortunately I don't find a replacement chip or dont know where to order one.

I even dont find a datasheet.

I have a lot of TBA820M, but they seems not to be pin compatibel.

Could someone offer a 575C2 to me or another good idea?

Kind regards
Franz