Accuphase E-470

I would look for one with the correct voltage

https://www.hifishark.com/model/accuphase-e-470

I wouldn’t assume that a solid state amp would automatically sound better at lower volume. Some speakers need a bit of juice to open up. Just the way it is. That said, most Accuphase integrateds have tone controls, which can be used to adjust the sound at lower volume. Or you could buy a Schitt Loki equalizer for a little over $100 and use that at soft volume. If you're really hung on Accuphase, David Michael audio has a demo integrated for sale for $3k that looks great.  I would have bought it but it's too big and heavy for me.  The thing is BIG.  Check dimensions before you buy. 

correct ac voltage is really important

i think it is unwise to use a voltage transformer long term for expensive high end audio equipment, esp one that draws substantial current

transformer blows u will have major headaches

I would not buy with incorrect voltage. As jjss49 said above, you may be asking for problems.

That is before remembering that audiophilia is full of arguments about cable direction, fuse color, and similar details and that you are about to add another transformer of whatever quality.

Read several articles about Accuphase using dual voltage transformers.  Requires internal rewiring, may want to look that up. :)