Linear Power Supply?

Thanks @lewm . My Roadrunner shows me 33.333 + .003 in operation and occasionally shows dead on 33.333 for stretches. I wonder if an LPS would tighten this up any more, if it matters. My measured W/F via Analog Magik is .06, which may in my estimation get even better if I were to upgrade my VPI inverted bearing to a ceramic ball and matching thrust plate.

By more precisely I meant would the motor run at a given speed with less measurable variance.

I do have a question into SOTA so I’ll see what they come back with.

I see much discussion out there about using LPS but nothing concrete about direct TT benefit. I do want to have some details on this as I don’t want to rely on an emotional response of mine.

@lewm I was going to mention the Brinkmann tubed power supply. I’ve read that it’s better but I don’t recall anyone giving a good reason why it should be in this application. Now I’m a firm believer in tubes in the amplification chain of my system, but here we’re talking about driving a turntable motor accurately. So, as with the sparse info given on the Brinkmann the last time I checked, I similarly remain unconvinced about LPS benefits in this application. I’m not writing it off and I might just try it..

This is an exercise in frustration for me. A whole lot of words but no mention of specifically WHY and HOW. If I were interviewing someone for a programming job, they would not impress me with this sort of vapid marketing speak:

https://www.brinkmann-audio.de/main.php?prod=roent3&lang=en

So I purchased a SOTA LPS recently and I've been using it for a couple of weeks. The sound quality certainly isn't worse than before and it may well be better. It measures marginally better through Analog Magik. When I last measured Wow/Flutter in late 2021, I was getting .066 and now I'm getting .064. I doubt that I can hear a difference based on this alone. Also, I'm using the same belt as before, which may have stretched slightly - a good thing in this case, and the bearing temperature may have been different. I did let the turntable play about 10 minutes before testing. Also of interest is the possible reduction of switch mode power supply noise fed back into my system - even through a PS20, which I suspect may not completely eliminate such noise. On a side note, I have also eliminated all switch mode power supplies except for those on the ethernet side, which is isolated optically. So, maybe the SOTA LPS is better, maybe it doesn't make a difference. It's hard to know because of all the variability in the system. But based on what I've mentioned, I am glad I purchased it.