Loud pop when I use the turntable on/off button

Actusreus is absolutely right.

Change the capacitor across the on-off switch from the .001 microfarad installed to a .01 microfarad. That is also the recommendation from VPI. Worked great in my system, thump instantly gone, now I can turn it on/off at any volume. Just unscrew the trap door under the on/off switch, the capacitor is across the on/off switch with screw on insulated electrical connectors. I found it easier to take the platter off and then tilt the turntable on it's side on the carpet against the couch with the trap door at the top. I emailed VPI and they actually sent me the capacitor, but you can get it at any radio shack for less than a $.

Thanks for the very helpful advice.I will replace the capacitor.

Make sure that the capacitor you purchase is rated to withstand a high enough voltage. Assuming the rating is specified as WVDC (Working Volts DC), and assuming that you are in the USA or another country where the line voltage is around 120 volts AC, I wouldn't choose anything less than 400 WVDC, to assure long-term reliability.

Regards,
-- Al

I wonder if VPI has fixed this problem in production yet? They have known about it for years now. The part is very cheap.