Why does the VPI motor thump

I have the same issue on my Classic II. Matt was somewhat offended when I asked him how to fix the problem. He made it abundantly clear that it was NOT a problem with the turntable but rather my preamp was picking up the collapsing magnetic field of TT motor when turning it off.

He said the two solutions are either install a larger cap ( I don't recall the value) or use the mute switch on the pre, which is what he does. That seems to be the easiest solution so that is what I do too.

In my earlier post I incorrectly said I spoke with Matt, it was in fact Mike. Here is his response regarding the cap value he recommends.

"We use a .001 microfarad capacitor across the on-off switch because it usually works with most components to eliminate the pop, you can change that to a .01 microfarad cap and that usually helps or eliminates it with some of the other components available."