JP: As I mentioned earlier (I think ;-) an isolation x-fmr + a voltage regulator is really all many people need, assuming their power isn't dirty (noise) and the sinusoidal wave shape is good ('perfect' is probably asking too much ;-) Elec. Specialists make several kinds/combos of products, and their isolation + voltage regulation units would fill that bill. I would not recommend their products that also include passive filtering/conditioning because as I already mentioned, passive conditioning is not IMO a valid option for audio power conditioning. BTW, I think Richard Gray makes a line of audio-quality isolation transformers.
A regenerator will do it all, EXCEPT for isolation. And to be honest, the last time I used an isolation transformer was about 40 years ago in Los Angeles where I can't recall seeing any lightening in all the years I lived there. I have no doubt they work, and due to the hysteresis effect (magnetic 'lag') of the iron core, provide some smoothing of the AC waveform if it's jagged -- but again, a regenerator will do a better job with that too.
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