Nottingham motor controler

Yes, do it.

I have a NA Mentor, much modified. Motor and WM are vintage 2014/12. I suggest that you get them both at the same time, and they will match the WM to the motor.

The upgrade made a significant difference in my system, at a very reasonable cost.

How have your Mentor been modified?
Well, the motor came with the table, that's what I have.
Yeah, it's about $750 from UK, over $1k in the US.
But blown transistors? I don't like it.

Inna, don't let the comparatively low price of the Falcon PSU deter you. It's got a lot of functionality built into that small case. You can do speed and voltage calibration. I'd at least investigate a bit. No affiliation to the manufacturer, just a happy customer.

There is another PSU from the same company, a little more expensive.
I would still prefer, I guess, what is recommended by Nottingham, but I'll have to think further. No rush.

Inna, the most important mod was to the plinth. I used an aluminum / Baltic Birch plywood / aluminum sandwich, and further isolated the motor. Also went to an air bearing tonearm (big difference).

If I remember correctly, NA will match the WM to your motor. Of course, that means sending it to them and being without for a few weeks. But new motors are not expensive from NA - and with the cost of courier ... and then you don't have a new motor with new bearings ... and you don't have a spare motor ...

I have experienced no blown transistors or other problems. I also protect the WM with an isolation transformer.