VPI motor makes loud pops when turned on & off

I tried the .0022 instead of the original .001 - it still pops so I will put the original one back in.

This motor does run very smoothly and silently.

I took apart the motor housing today and found that my motor is the 600 RPM Aries motor and not the 300 that I had guessed.
The 300 RPM motors are a relatively inexpensive upgrade from VPI..
Has anyone heard a real difference when changing to a 300 RPM motor?

Joe

Sidssp - on my motor, the .68u goes between the red from the motor and the black from the motor.
The .001 goes between the 2 wires to the on\off switch.

Joe,

Did you ever figure this out? I have one 0.68 mfd 100 VDC between the red and black across the dc motor, like you have. I also have one in series with the AC switch labeled F102KT 630PP1, whatever that means. Which one(s) need to be changed to what?

John

I had this same problem, after "upgrading" my 600rpm motor with the 300rpm kit. A LOUD snap when turning my motor off and forgetting to mute my preamp, and a lower level pop, even with the preamp muted. The situation could be mitigated, somewhat, by SLOWLY operating the switch. Either way, I found the situation completely unacceptable, so finally I got around to soldering in a snubber circuit.
I used a five watt 180 ohm resistor, and a 630V .033mF film cap I had lying around.
For those of you who may not know what a snubber is, in this application, its just a capacitor in series with a resistor, wired in parallel with the switch. Problem solved.