cleeds, Do you dispute what I actually wrote, in essence, that you can set platter speed with the SDS or the Walker? I did neglect to mention that the motor should be of the AC synchronous type, but that wasn't really the question. Most turntable motors fit this category, to one degree or another. Also, I don't know how you can say that current has no effect on platter speed, but frequency does. "Current" has the property of frequency, which as you say does determine the speed of an AC synchronous motor. I have read conflicting statements about the degree to which AC line frequency is tightly or not tightly controlled by power companies. Most sources say it's "pretty good" with small variations over short time that average out to 60 Hz over longer time periods. Is that good enough for most audiophiles? I don't think so.
Jerry, Stylus drag is definitely NOT constant, by the way. It's constantly varying across the surface of an LP.
Jerry, Stylus drag is definitely NOT constant, by the way. It's constantly varying across the surface of an LP.