VPI SDS capacitor question

You can get them at any parts supply for a buck or so; I forget the value, it should be one here in the archives. I replaced it on the only Classic I have sold so far as the standard cap was giving a loud pop when turned on; no SDS was involved. Very easy to replace; just took me a few minutes and I have slowed down a lot the last few years.

This is the message I got from Mike at VPI about the cap:

"Your Classic has a 600 RPM motor that  uses a .5 microfarad capacitor to start, when using the SDS you really need to change that cap to a .68 otherwise the SDS is fooled into thinking there is nothing there."

To the OP - you wrote that you have the Classic and SDS already. Do you not have that startup issue (where sometimes the motor doesn't run at the higher initial voltage long enough to get the platter moving before it drops to the lower voltage)?

I also have the SDS with the Classic and VPI changed the capacitor to the .68 version. Hope this helps.

I don't believe I've experienced any of the issues described. I've always given the platter a finger spin as I turn it on, even before I got the SDS, so that there is less pull on the belt. I still do it with the SDS so that it hardly ever displays 115V; it simply stays at 72V, unless I've had too much Scotch and don't time the finger spin right. It goes to 115V on startup and then 72V after a few seconds.
The only "pop" I hear is when I turn the table off, but I simply turn the volume all the way down before doing it, and no pop is audible. It has become part of the process.

I guess my question is whether I need the capacitor at all, and how do I determine if I actually need it? To put it differently, is my SDS not performing as designed without the correct capacitor?

If it's not broke, don't fix it. If it sounds good, leave it alone.