Well, I figure if I swing enough times, eventually I’ll hit the ball. Either that, or I just happen to post at the peak of my morning caffeination. 
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Gotta have a doughnut with the coffee…
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I received the repaired unit back yesterday and have it breaking in now. It had several transistors on the right amp (the side that was burning hot) replaced.
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Even if were so mad at the P15, I would not use it for brewing coffee.
That would be a tad expensive for my taste. Moreover, I still respect the innovation and the innovator 
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Just a yoke er joke a try at some humor…
Glad you have it back!! May it play on with a long happy life!
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I knew and I appreciate it! Never mind my sobriety and political correctness, a temporary mutation 
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I appreciate ya as well pal…
Since I use instant coffee no chance of hooking up a coffee maker
to my newly landed without even a “thud” 73 lb light P15…
Yes you read that right …ah ha 
Delivery driver even placed the box in side my house avoiding my
having to lift it with my challenged back…that was such a Blessing
for me…wow!!
So how is it? Does it play well with it’s neighbors? Induce tranny
hum in connected gear…?
Perhaps another story for another “postems”…Ever drink that stuff? 
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Hello again David,
P15 isn’t here yet. It should ship any time this week or next week. P15 seems to be in high demand. Thanks to the fans and to the promo! I paid the full price tag to the dealer four weeks back, and hope quality assurance remains intact with the incessant flow of orders 
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Ay Serhan, friend I feel for you…will pm you
Thanks for this thread. While I have an Entech here (AND have used it to tweak some DIY power supplies for minimal impact on the AC line), given the sonic improvements I hear with my current P15s (and also did with my previous P10s), it never occurred to me to check the AC input to and output from one of my PSA Regenerators.
After a bunch of tests, here’s what I found…
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I get noise at both the input and output of each P15 when running.
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The input noise is above that of the wall ambient. Plugging in a parallel AC filter or a power supply with an in-line AC filter built in brings it down below wall ambient.
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The output noise is not wildly different, similar in audible character, but perhaps a little more? Connecting an AC filter or power supply with a filter as above does not change the output noise. Powering on a larger piece of fed gear (BHK-250) also does not change it significantly, if at all.
IF I hadn’t both heard the improvements brought by the P15’s (and their P10 predecessors), I’d be worried.
As it is, I suspect the output noise revealed by the Entech is a byproduct of how the current version of the PSA regenerators work.
While the original PSA Regenerators were literally power amplifiers being fed from a good 60Hz source, the current ones use a patented error-correction process that leverage the incoming AC as a basis for the output instead of the “rectify and filter AC to DC to run an amplifier, then feed a high-quality 60Hz signal to said amplifier” of the original ones.
I found this MUCH MORE power-supply aware than I audio engineer & DIY’er’s description of how they work based on a read of the PSA patent the most lucid and understandable explanation I’ve heard of the current Regenerators… you can read it here, post #11:
AND if you want to read the patent yourself, it is here:
Of course, PSA has seriously refined and further developed the implementation since the old Power Plant Premiers.
AND just to further confirm, I dug out and fired up one of the two P300’s I have here awaiting rebuilds for use in my analog source setups. No noise indicated by the Entech on either the input or output AC. So different than the current Regenerators, though I trust both PSA and various reviewers in the recent ones being improvements over the original scheme.
I’m a bit of a fanatic on AC power. I had a “Road to Damascus” experience 30+ years ago when I implemented dedicated lines in a house where I could easily do that. I describe the impact as “sounding as if I had doubled the value of the gear” I had. Sadly, none of the places where I’ve lived and owned since have a layout where implementing dedicated lines is as easy, though I still have thoughts of tackling it here.
In the absence of dedicated lines, I use a “defense in depth” strategy with clamp-on noise filters on household appliances that do or could feed noise into the local AC, distributed parallel AC filters (Quiet Lines and several types from MIT), parallel or inline filters on my AC-connected DIY gear, and getting as much gear as I can off the grid using several schemes. AND a P15 in each of my two setups for the gear I cannot easily take off-the-grid (BHK-250s, modified Allo.com Shanti 5V power supplies feeding my digital music player endpoints, and in one setup a DIY ± supply for the DAC output stage). AND I have parallel filters on the AC line ahead of each P15.
AND even with all that, I still hear differences between “normal powerline” times and that magic time from roughly 2am through 6am where most everyone else is asleep, most businesses are not yet functioning, and the setups sound their best.
AND this is not a knock on the P15’s! With them in my setups, each sounds better at the “worse powerline times” than they did without the P15 at the “magic time”. AND the “magic time” sonics are even better!
In any case, I appreciate you bringing this to our attention. AND reminding me I should use my Entech to help judge whether a particular filtering scheme works… this round had me remove one set of filters that sounded good when I first put them in, but the Entech indicates they produce noise! And after another round of back and forths, I decided I prefer them OUT!
Greg in Mississippi
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