My Musical Fidelity X-A1 has a separate toroidal power supply (its X-A2 bigger brother came with one as well).
Not super high end but a very nice "tube-like" sounding SS amp from 20+ years ago.
I just need a set of metric Allen wrenches and some thermal grease to get mine up and running again (fixed a broken lead on a wire wound resistor 15 years ago, but didn't have replacement thermal grease to use it long term - tool kit with the wrenches was stolen from my car).
Thing is that placing the power supply @ a certain distance and "angle" from the main unit improved the SQ.
DeKay