SOTA Sapphire speed issue

@lewm Can you point me to an example of an outboard motor controller?

VPI SDS, Walker Precision Motor Controller.  Neither is state of the art but both provide an audible improvement.  There are many new developments in this area; I am now using a Phoenix Engineering Eagle power supply with a RoadRunner tachometer.  The RR feeds back to the Eagle to hold speed around 33.3333 rpm. (Yes, according to the 4-decimal-place readout of the RR, the speed flirts with that level of accuracy.) This is on my Lenco L75.  But sadly, Phoenix is out of the business.  I just noticed that George Merrill sells a tt PS.  Check whether SOTA markets one for their tt's.  VPI also has a newer power supply that may be less expensive than the SDS.  Look also on Audiogon for used stuff.  There are kits under development, as well, if you have DIY skills.

I've.akso been having severe speed instability issues...in my case, related to a fried power supply, just as @effischer describes above (same deal, too, fried in transit, loose transformer,. Etc. Etc). I've temporarily replaced with a $10 24v wallwart power supply I had lying around, but predictably, it sounds horrible with wow and flutter. I was wondering, @lewm , wouldn't something like this function quite well (may even be overkill)? :

http://www.ebay.co.uk/itm/50VA-Hifi-linear-power-supply-LPS-DC5V-9V-12V-15V-18V-24V-for-choose-ZJ-91...

@yourmomm I've been running my Sota PS for several years now, and it's rock steady.  I adjusted the settings when installed, then again after the belt had settled and everything was worked in.  Spot-on ever since.  Your call, but I'm really happy with the OEM solution.

Good luck & happy listening!