I acquired another turntable to tinker with yesterday, a Sharp RP-1122, pretty basic 70s belt drive unit. It runs slightly slow and the speed change doesn’t work properly, both of which I think are the fault of an improperly sized belt (too tight). It also emits a loud pop through the speakers when the motor engages. This appears to be a power spike as its evident even if the inputs aren’t plugged in, and it is reduced if the turntable is plugged into a different surge protector to the amp. Any obvious fix for this from the brains trust?