Has anybody experimented with measuring how much their turntable speed is affected (if it is) by the load presented by playing a record? I am lucky enough to have a very accurate strobe (battery powered) and matching disk and have always set the speed to be accurate when only the strobe disk is on the platter. However, a recent re-reading of a review of the SME 20, and a post on another forum, has made me wonder if the real speed of the platter when playing a record was not slightly too slow. Both the review and the forum post suggested that the stylus drag was sufficient to slightly slow the record. As a result I re-jigged my measurement procedure so that a record could be played at the same time as using the strobe (this sounds easy but is a bit trickier as the strobe disk is full platter size - a 10" record placed on top was used) and I can't detect any speed difference with or without load. Has anybody found any different?