So, as Elgar is not available anymore, what brands/models do you know of that work well?The PS Audio Power station uses a regeneration technique that works pretty well as long as the unit is run well below its recommended maximums.
For our amps that has often meant one of them per channel. They may have a bigger model now. If the amp places a heavy draw on the unit on an on-going basis, it is best to go with the next size up. But I would still audition it against the raw wall power.