Could it be changed bearing tolerances due to dissimilar metals ? My rega has a brass bearing housing, with a steel shaft: these metals expand and contract differently. It's pretty common to have a brass or bronze housing with a steel shaft, and a steel, ceramic, or saphire bearing ... all different materials.
One of the Brinkmann turntables has a small heater in the bearing housing to maintain a constant temperature. It seems a bit extreme to me, but perhaps there is a measurable difference in performance.
One of the Brinkmann turntables has a small heater in the bearing housing to maintain a constant temperature. It seems a bit extreme to me, but perhaps there is a measurable difference in performance.