Why does the VPI motor thump

I purchased a VPI 'Scout' when they first came out, and thought that I had the turntable for the rest of my life. The motor was just plain noisy, and there were other issues, which I am not getting into here, but I got rid of my VPI very quickly.

Very disappointing!

My TT motor on/off switch has no capacitor and it never thumps.

Of course it's battery powered and not connected to the electrical system.

<:-)

...just thinking....maybe because my system is totally balanced may have something to do with the silence of switching off my VPI

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."

This is the reply I received from Mike at VPI in 2010 after I had this problem with my Classic 1. It completely fixed my thump.

VPI Customer Service
11/26/10

The pop is system dependent and since we have no idea what a customer has we install the cap that works 80% of the time. You need to change the on-off bypass cap to a .01 microfarad 400V non polarized cap. We usually install a .001.

Mike