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So Weird- No Stylus Contact Woofer Pumping with Hana ML and Elac PPA-2

I observed the weirdest thing I have ever seen in audio. With the cartridge positioned above the record, tone arm locked up and platter spinning, the woofers were pumping on my system. I googled every permutation of query I could think of but came back with no hits. That’s when I decided to video the problem- link below:

Mystery Woofer Pumping

I could type out all the details but the video pretty much covers everything. I thought ya’ll might be interested in this.

 

mitchellcp
fsonicsmith1
101 posts
 

@lewm 

lewm

11,075 posts

 

fsonic, I don’t know what I said to make you so angry, but you DID write, ..."or degauss the current mat, or put a blocking capacitor somewhere." And this is what led me to believe that you were supposing that a capacitor can block a magnetic field. Even Sherlock Holmes could testify to that fact.

You have me confused with someone else. I did not write that. 

mitchellcp OP
86 posts
 

@lewm you may be correct about the oscillating- not enough information right now. I’m re-wiring the tone this weekend with Audionote Silver and silver clips- I’ll have everything apart anyway so I might as well try again. 

lewm
13,276 posts
 

fsonic, Mea culpa. A thousand apologies.  It was Holmz who wrote the sentence I quoted (and responded to), not you.

fsonicsmith1
101 posts
 

@lewm 

No problem. You are one of my favorite contributors on this Board so I'm glad to have that cleared up.

holmz's avatar
holmz
2,328 posts
 

It is super interesting.
Do you access to a compass like hikers use?
I think even an iPhone with its magnetometer built in might work as a way to see if the mat is somehow magnetised.

Sure, it is possible, that it is somehow related to wiring… but I doubt it.

When I had a 50 Hz hum it was also from a magnetic field, and the coils in a MM or MC cart are effectively a magnetometer.

If it is only doing the pumping when the mat is on, then I would think that removing the mat would be a possible strategy to use to ameliorate the pumping.

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