Quote:
Originally Posted by VicsVinyls
... as the needle drags over the record the speed can change b/c the grooves are different as it goes. You have an SDS to maintain the speed, isn't this the whole reason for the SDS? ...
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I'm not sure what you mean when you say "the grooves are different" or why that would affect platter speed. Frankly, it's very difficult to imagine that a diamond stylus with a tiny footprint tracking an album at a couple of grams on a 22-pound platter can be subject to groove-induced speed variation.
The role of the SDS is to filter the AC power - actually, it regenerates it - and allow the turntable speed to be set precisely. That's how it maintains speed - it doesn't use a servo to correct for any speed deviation.