Stylus Drag

..just for the halibut, I checked the speed of my VPI Superscoutmaster/Rim drive with and without the arm playing the record. I put on a record with a wide dynamic swing, and the hash lines of the strob remain in place...not moving forward or backward no matter if the record was played or not. Id be interested in the results of a belt drive, and a direct drive table if anyone with those pieces should be inclined to test them.

If you search the forums you will find that all 'tables, regardless of drive choice, have to deal with stylus drag. Don't take my word, search. It has been reported by several designers/manufacturers. Also, as several designers have schooled me, there is no such flywheel effect from heavy platters that compensates for this.

IT's been awhile, but with many older belt and DD tables from the 70's, back when I dealt with many, I do not recall the strobe indicating any measured slowdown in speed with record playing versus not with units in good condition. WIth units with worn or dirty belts, measured speed fluctuations with the strobes were often apparent and resolved with a belt change or good cleaning. I recall many of these did use servo motors of various types.

"Also, as several designers have schooled me, there is no such flywheel effect from heavy platters that compensates for this. "

Its basically inertia. A heavier mass in motion will require greater force (friction in case of stylus tracking a record)to change speed than otherwise.

That's why I would expect greater mass platters in motion to be less susceptible to small changes in drag/friction as the stylus tracks than otherwise.

ALso I suppose higher tracking force would result in greater drag/friction than less tracking force, so of course as in most things it all depends. Drag/friction is a fact but how significant it is is more up to debate I suppose and could vary widely case by case. It all depends....

For me, if the speed measures as accurate an stays that way and I do not hear any ill effects, I would not worry about it.

Of course, that will not stop some who really really care from fretting......

Yes, a platter does store energy. Apparently, that alone is not enough to counter stylus drag.