Is the Technics SP10R motor controller using a switching power supply

In other words, the step down acts as an isolation transformer, protecting ancillary equipment from EMI that may emanate from the TT motor.

Lewm, thanks for that, and your points are well taken. A step down can certainly do the job, and with the added benefit of isolating from the mains.

A glance at his system page suggested to me that the OP is a pretty sophisticated audiophile. I figured he knew about step downs, which are not esoteric, but perhaps not the Monarchy, which is a pretty nifty gizmo--and cheap for its type-- that not only regenerates the AC but can step it down (and change frequency) if one wishes. Just trying to add to the info pool.

Guys,

Thsnks for the inputs. My current SP10mk3 runs on 100v and I have a stepdown trans (300w) 120v to 100v. But was looking to svoid using this stepdown. You know how it is, too many gadgets, not enough sockets/space etc.

I also have a upgraded PS Audio 300 regenarator but don't use it currently.

I am a fan of the PS Audio regenerators and have no reason to believe the Monarchy is not also good. What I have found is that there is no telling in advance where they’re going to provide an audible improvement. My old PS300 failed and PS Audio doesn’t repair them any longer; instead they offer a favorable trade in. I then acquired their latest low output model( in terms of Watts). I’m using it to supply AC to my Sound Lab 845PXs, and it makes for a nice improvement in sonics. 
 

Ddrive, who upgraded your PS300? Can they do repairs as well?

By the way, ddrive, using a step down doesn’t add any sockets or even require a new power cord. They come with a hard wired AC cord. You plug that in wherever you would plug in your TT. The cord from your TT then plugs into the 100V outlets on the transformer casing. I’m sure you know this, so I’m wondering why you’d phrase it the way you did. Most of all, to anyone with a vintage Japanese TT that requires 100V, don’t plug it in to a 120V outlet and hope for the best. Many were damaged that way back in the day.