Thorens PSU124

The center knob on the speed selector is how you fine tune the speed. Just pull up an owners manual online and it's all explained there. Now if your saying that you've run out of adjustment before the speed is correct, do a search for td-124 eddy brake adjustment. You have to remove the main platter to get to it

exactly. the ’x’ in the center of the knob turns.

the platter has dots on its bottom edge. the mirror with a light reflects the dots, they either move a bit, or, you turn the control, slowly, wait, don’t over do it. until they stop moving. now perfect: until the temperature changes, check every once in a while, maybe a refinement is needed, but as I say, you probably cannot hear the speck of less than perfect speed.

this minor speed change will happen no matter what power supply you use, which is why I say, don’t bother with one, just plug the beauty in.

my memory, far from perfect: the eddy brake is a shield. the shield is what moves as you turn the upper knob, effecting more or less magnetics to effect another part’s movement, to slow or speed things up. no contact, quite clever.

It’s a great turntable.

Thank you, Elliott.  It is an absolutely wonderful TT.  I bought this one just a couple of months ago.  It was refurbed by STS and I've been taking to Greg there for some assistance on adjusting the speed as it seems that mechanism was removed due to the electronic speed control.

I have yet to encounter a belt- or idler-drive turntable whose aural performance was not enhanced by the addition of an outboard PS/speed controller, even though every other thing that Elliot says rings true to me. The addition of a competent PS usually results in enhanced perception of midrange inner detail and superior cleaner bass response.  At the very least, the outboard PS will block EMI from the tt motor from contaminating the AC that supplies the other components. The PS is definitely optional, but it is a possibly valuable one. (I have not heard a TD124 in years and never have heard one with an outboard PS.  My opinion is based on experiences with a Nottingham Analog Hyperspace paired with a Walker Audio Precision Motor Controller and a Lenco paired with the Phoenix Engineering gear.) DD turntables generally have a built in PS that also filters incoming AC, along with some sort of servo- or other based method to control speed.  So DD turntables need not apply, unless you want to use an AC regenerator upstream from one.