Just for the record, and speaking only for myself, I discussed the SDS only because that is the unit that Arsh asked about. What I said about the SDS is only hearsay. I personally do use a Walker Audio Precision Motor Controller, which does pretty much the same thing as the SDS but without some of the less useful SDS features. All my experience of the beneficial effects of a Motor Controller has to do with the Walker. Some, who have tried both the Walker and the SDS, have found the Walker to "sound" a bit better, but with a VPI tt, I assume the SDS would be a great match. There is no savings associated with purchasing the Walker vs the SDS. Used or new, I think the typical prices are about the same.
As to use of a laser tach and other similar gadgets, that's fine, but they do not address the issues at hand, and they suck up funds otherwise available for the nitty gritty solutions. The KAB strobe is the most accurate and cost-effective device for checking tt speed and speed stability, IMO.
