Zero Antiskate vs Stylus Wear


This article, based on a long term study, was “plagiarised” from another Forum. It’s quite an old article so apologies to “older heads” for whom this may be old news.
It comes from an era when light VTF = good, but was not necessarily true, however the basic principle of long term wear looks sound.
Styli were tested to destruction over their full lifecycle.

http://www.audiomods.co.uk/papers/kogen_skatingforce.PDF

Viewers may have to cut & paste but in the event of difficulty with the link I will give a brief summary :

Of 14 cartridge samples tested without bias, 9 of them suffered excessive wear on the inner groove. One was neutral and the remaining 4 were “outer wall”.
When bias compensation was applied to a group of 6 samples, the wear pattern that resulted was symmetrical.

Given the strong and logical argument that skating damages styli asymmetrically – and gives a skewed reading of the LP over time, the “deviations” are a concern i.e. why 4 of them behaved oppositely.
Poor bearings? Arm cable too stiff? Wrong geometry?

IMO most turntable enthusiasts considered it self evident that unilateral force would cause this type of wear pattern so we didn’t need to be told but documented study, even one as old as this, is always interesting.
The photograph of the spherical stylus is poorly resolved on this copy but it makes the point quite graphically.

Based on long term experience that the simplest things can affect the sound of a turntable, I cannot deny that the idea of “de-stressing” the cantilever by removing a poorly directed/located AS force IS attractive and may produce a degree of audible benefit…at first...(?!?!?!!!)
The doubter in me always asks the question : can a mechanical assembly successfully zero out all mechanical influence and give a pure result? (If true zero AS is the goal even arm damping might be prohibited?)

The principle of using excessive VTF (up to 50% more) to achieve the same “trackability”, without bias, it was suggested, merely accelerates the unilateral wear & tear with (presumably) commensurate damage to the LP(?)
The proposed compensation of up to ”50% extra VTF” sounded a bit excessive to me.
(I’d balk at applying more than 0.1g over maximum.)

Old as it is, I found this study mildly unsettling.
Comments and opinions are invited from both Zero-antiskate adherents and those who always use AS.
moonglum

Showing 2 responses by tonywinsc

Raul, your point is well taken. That is what makes vinyl playback so interesting. Perfection gets boring after a while. Something so special or romantic about the glow of the preamp tubes, the spinning platter and those golden tones- with a little background crackle :)
This link is to an old post where I made some comments about Anti-skating. This article is very good and the article's conclusions, fortunately for me, are about the same as I stated in my post.
http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1325141286&openusid&zzTonywinsc&4&5#Tonywinsc
I did some research and as I recall, the record materials , ie. vinyls, used became more consistent in the 70s and 80s which is good because the coefficient of friction is the main contributor of skating force.
Also interesting to note is the article stated that a constant Anti-Skating force from start to finish is a minor factor with respect to performance and stylus wear. Setting AS force by ear may/or may not be optimum because no AS force will result in uneven stylus wear. I set mine by the dial on my tonearm; but my final check is with a test record.