static Issues...anybody know why?


When I use my Lyra Delos, no static at all.  When I use my Ortofon Quintet Mono, I have to pry the record off of the platter.  Why?
tzh21y

Showing 5 responses by lewm

What should it do for me? What are you trying to say? Is this in support of the notion that the stylus rubbing on the vinyl causes static charge accumulation? I disagree that this is a major cause, only because it appeared after reading the Shure white paper on static that the authors had actually done the experiments and shown that while there is some enhancement of charge due to playing the LP, it’s minimal relative to other causes and minimal relative to the amount of charge that maximally can accumulate on an LP. I asked you to provide contrary evidence, not contrary theory. You may be correct, for all I know, but I do know what the Shure paper shows. So far, from you I have theory only. Your declaration that Shure is “wrong” is not really enough to convince me. I will give you this: Subjectively, it seems to me that charge is enhanced after playing the LP. However, the Shure paper would suggest that the tendency of the LP to want to stick to the mat or the crackle I sometimes hear upon lifting the LP off the mat is caused by the static charge re-distributing itself over both surfaces of the LP, not necessarily due to new charge on the LP.

After further research, I am beginning to think Mijo is correct.  Case closed.
Geoff, as regards the skating force, you are either joking or very wrong. What happens on a blank area of vinyl is not a lot different from what happens when the stylus is tracing a groove. Friction and lack of tangency. You can call the skating force a “centripetal force” if you want because in the loose sense of the term, it is. 
The primary cause of the skating force is the friction force between the stylus and the modulated groove. A skating force is generated because of two factors: (1) the headshell offset angle, and (2) lack of tangency to the groove, which pertains everywhere across the surface of an LP except at the two null points that are created if one follows any of the accepted alignment algorithms. At the two null points, the cantilever is tangent to the groove, but because of headshell offset, a skating force is generated. Thus, there is always a skating force all across the surface of the LP, although it is constantly varying in magnitude. These conditions apply to all pivoted tonearms that are mounted such that the stylus overhangs the pivot and which also have headshell offset. By the way, centripetal or centrifugal force has NOTHING to do with the skating force.

The primary cause of static charge build up on an LP is NOT the friction between the stylus and the groove.

Those are my only points. Mijo, if you have data to dispute the second statement, let’s see it.
Mijo, I am not sure what bone you are picking with Geoff, but the very same Shure publication you cited has a section on static.  There you will find some real experimental results, some of them showing that friction between stylus and vinyl is NOT a significant cause of static electric charge on LPs.  The mere act of removing an LP from its sleeve is much more to blame.  As is “us”, the shoes we wear, the carpets we walk on, etc.  The Shure article mentions use of electrically conductive vinyl as a preventive measure, but few LPs are made from such material; I think RCA Dynagroove may have been conductive.  Also, when you discharge the surface of an LP you are about to play, that charge is merely shifted to the down-side of the LP.  When you then remove the LP from the platter mat, the crackling sound that can be heard is the charge re-distributing itself over both surfaces.

Shure incorporated a brush into some versions of the V15 that removed static ahead of the path of the stylus; that’s why I suggest that the reason for the OP’s finding with two different cartridges might have something to do with how they are constructed, whether there is a path from the cartridge into the tonearm to drain static charge, etc.
Possibly the two phono cartridges differ in the degree to which the body and/or the cantilever of the cartridge is grounded, thereby making one of them more likely to dissipate static charge vs the other.  I agree with Geoff that the rubbing of the stylus against the vinyl has been shown NOT to be a major cause of static electricity build-up, but charge can be removed by devices that are in a way similar to a cartridge.