AC Regenerator

@inna   That's great!! I'm glad to hear that your PPP is working so well for you.  You are probably experiencing a significant improvement as you state you have "very dirty" power.  My incoming AC only has 1.7% THD.  From what you are saying your THD would be significantly higher than that making your PPP a true godsend.

Incoming THD is 2.0% at best and usually worse. In the past two years I made four upgrades: 1. PPP - biggest improvement, 2. Purist Audio Neptune interconnects between phono stage and integrated amp - second biggest, 3. Purist Audio Dominus RevB Ferox power cord for the amp - third biggest. But all three were quite big. I also got Tchernov Reference MK II interconnects that I use from phono to tape deck when I run the system like that, which is often. In this case Purist goes between deck and amp. In fact, in my system this arrangement gives overall the best sound from vinyl.

However, it still sounds better late in the evening than in the daytime. So, by audiophile standards PPP is not good enough. I'll probably upgrade to P5 or P10 at some point.

Clean power, regardless of how you accomplish it is to me the largest factor in a musical system. Put another way, the further up the line you improve the signal the greater effect you have throughout the system. I use balanced power throughout and it's great. I'm sure the PS Audio is great at this also. Reproducing music with dirty power is a compromise throughout. 

Just to mention all is not perfect in the regenerator world. The very small but forgotten problem of some tube equipment cannot use the PS Audio balanced power/Technical power output. Directly heated triode just cannot be used with  it.Then a few pieces of equipment DIED when the various multiwave features are used. (now THAT may be solved with newer models? But with older models the various multiwave modes CHANGE THE actual AC VOLTAGE to as high as 130V measured, even though the meter on the machine says 117. To read up on that you will need to Google some.
These turn into problems few, and far between. but have happened.Also the fact upping the AC frequency with older PS Audio machines may cause problems with the equipment connected. usually just lowering the AC frequency back some is all that is needed.Sadly most of these things are not really written about on the PS Audio website.    
I like my PS Audio P600 as much as anyone. But it is changing things, and you should know what it is doing, not just think it can do no wrong.