BTW, fortunately my friend turntables have very little rumble, but anyway we were addressing separate motors, not turntable bearings ...
Isn't this what you wrote?
I have a good friend who is a stethoscope fan - he tunes his turntables to absolute minimal mechancial noise.
So what does he do to motors, change spark plugs
? You can remove some vibration from some motors with a 3phase supply but tune it how otherwise?
The moreimeediate effects of ramping are faster startup and convenience keeping optimum drive quality, an important aspect for many users, such as me. My car does not need a push to start, I expect my turntable to do the same.
We do it too along with many, many, many others, very old technic and the reality is that has no sonic benefit and the only time you need to ramp up for optimum drive quality is when you have to use a governor to nudge the platter up or down. In fact when using solid belts with heavy platters to speed up quickly without a little nudge one has to over tighten the belt to some detriment of sound quality, the purpose of a heavy platter is to use inertia to spin freely with less input from the motor, by tightening the belt so you wouldn't hurt your fingers giving the platter a nudge will only hold the platter back and increase the influence of the motor that one to reduce. FYI the tricky part is the ramp down so you don't overshoot coming down too fast from 45 to 33.3 and vice versa when ramping up, startup is not important and you don't need a governor, servo or feedback loop to program any of this.
Let me know when your car starts playing records
!
David