Let’s review,
Woofer pumping is tied to rotation speed, the pumping is faster at 45 than 33 also spinning the platter by hand will excite the woofers.
A- Pumping exists when the system set up is: Balanced output from tonearm to balanced input at phono preamp and:
- Stylus is over the play surface and the platter is rotating- not off to the side (it also persists with the stylus on the record).
- There is a just a record on the platter (rotating)
- There is a just a mat on the platter (rotating)- the mat is a synthetic material.
- There is a mat and a record together (rotating)
B- Woofer pumping stops when:
- There is platter rotation and the platter is empty, no record, no mat
- There is no rotation regardless of what on the platter.
B1- Disproves the magnet in the platter theory. Also the platter is hot forged and is as close as humanly possible to 100% pure aluminum. There are no ferrous metals involved.
Static electricity is just that static, hanging on for as long as it takes to discharge to an object of lower potential. I believe it’s widely accepted that vinyl records are able to hold a static charge. So I’m all in on that.
@nrenter I’d be interested to check the humidity of your house-
25%RH right now.
if you wet-wash or simply dry brush your records, etc.
Wet wash occasionally, dry brush prior to use.
Did the single ended connection really solve your problem?
Yes
Did the rewiring create a better ground path?
Ummmmm... maybe? I just check continuity and move on.
Why do people feel the need to comment without watching your video?
I don’t know, it’s annoying.
@lewm The issue with the pumping occurred over a period period of days and the video shows only the effect and it’s current solution.
To me the bigger question is about the implementation of balanced phono output overall. I was pretty eager to try balanced output in my system for it’s obvious benefits, 6db boost over single end, inherent in system noise reduction etc. I was not expecting to see a whole new problem surface.
I would really be interested to hear from anyone with a balanced output system as to how their experience is going.
It’s possible this is one reason so few phono preamps offer this feature. I know Project has a whole program for balanced TT’s. If so, I’m guessing they have incorporated solutions to situations like this.
There could be a simple wiring fix to this.
I will be looking into static control and once I have some tools on hand, I’ll probably attempt the Balanced output experiment again.