Since my post above I did buy a LongDog Audio controller for my Thorens TD124 from Robin Wyatt of Robyatt Audio in upstate NY. It seems to be equally effective as my Russian (or perhaps Ukranian) -built PSU that Ray Clark sells out of the UK which I still use with my 301. Fwiw, I tried to buy a second PSU from Ray Clark (a well known Garrard 301/401 specialist) and it seems he has gotten old and forgetful. I got tired of continually asking him to sell me one of his PSU's and simply started looking elsewhere. The LongDog has a quartz lock loop, I believe, that seems to control speed effectively. What I don't care for with the LongDog is that the speed controller is a bit counter-intuitive to use. It's hard to explain. Just trust me. Robin Wyatt btw is a pure pleasure to work with. Says something about him that he was best friends with Art Dudley and that Julia trusted Robin to sell Art's audio gear.