I have been closely watching Stromtank, off grid power supply. I believe you can find some reviews is Absolute Sound and Stereophile.
While I concur with the benefit of the higher quality and the tighter grip of hospital grade receptacles, most of the benefits spoken of here are results of clean, tight, new connections rather than over rated circuits and large gauge wire.
Running my i,200W microwave (rated to pull up to 10A) through a 20, 30 or 50A circuit, even with a cable the size of a fire hose, would not heat a cup of water any faster than it does through the 15A circuit it was designed for and an amplifier pulling considerably less amps, isn’t going to sound any better either.
As pointed out by dpop, the amount of current pulled by a power amp and all related equipment (even on demanding passages) is quite minimal.
Some of the suggestions I’ve seen on this forum regarding electrical circuits and grounding are off base and in some cases not even permissible to code....Jim,