PS AUDIO P500 as a Turntable speed controller?

Make sure that your P500 has the most current chip that adjust the frequency of the Power Plant in 0.0625 Hz steps from 50 Hz all the way to 120 Hz. If your P500 has the clean sweep feature, you should have the most up to date chip.

I used to use a P500 with my Naim Armageddon to set the speed 100% correct and spin at 45rpm (the Armageddon only does 33rpm). It also improved the sound of the TT probably reducing the motor noise and vibration. Make sure you get a unit that allows for small adjustments.

IIRC, the P500 needs to be set at 81Hz to achieve 45 RPM. I had both a P300 and VPI SDS when I was using a TNT Mk II turntable, and the P300 was substantially inferior to the SDS, sonically. when used to set turntable speed. But I think the P300 is a terrific power regenerator/conditioner in general (I'm now using two of them).

When I bought my Nottingham 294 I also purchased a Walker MC (deluxe with Teflon circuit board). I also have a PS-300. I asked Lloyd directly about the PS product and he disparaged it a bit. I ended up selling the MC a few months after recieving it. I could not tell any difference between the Nott into the MC or the Nott into the PS-300.

Just be certain that you are not running other components from the PS300 that could be harmed by the different frequency. In this regard, when the Power Plants were introduced, some manufacturers claimed that use of PS Audio multiwaves with their equipment would void the warranty (ARC may have been one, I seem to recall). Not sure how this could be proven - the change affects the rate at which caps in a component are replenished - but you should be aware of the issue.

PS - I have experimented with changing speeds on my VPI motor by use of my PS300 and the other posters are certainly correct - it works - but given the above consideration and the other components also run from my PS300, I just move the belt for 45 rpm play (I only have a small handful of 45's).