e-skeptic wrote:Cleaning my stylus the other day, I noticed what must be slivers of vinyl.
It can also be dust. Dust comes in all colors.
e-skeptic wrote:So I did some investigating and came up with a potential answer which I have not found anyone else to have ever suggested.
Perhaps you would like to review all the threads we already have that had discussed all this topics in depth.
e-skeptic wrote:As we all remember from high school geometry, the intersection of a plane and a cone produces an ellipse, hence “elliptical“. But there is a sharp edge where the plane and cone intersect.
You are assuming that said edge touches the record, which is not the case.
e-skeptic wrote:The horizontal cross section through an elliptical cartridge will then look like two convex arcs connected by parallel lines.
Yes, and only the arcs touch the record.
e-skeptic wrote:Concerning this edge line at the intersection, either one of two conditions must be true:
1) The edge does not contact the grove wall. In this case , the stylus must trace the grove just like a conical, because the surface that touches the grove has the same radius of curvature as the conical it was machined from. There is no improvement in tracing distortion. Then we should bring back Dynagroove.
The stylus traces the groove like a conical, but only on the plane that is parallel to the groove contact surface. On the plane parallel to the record surface, things are different. There is
an improvement in tracing distortion and we have discussed this plenty of times, just google "minor radius" and "distortion".
Bring back Dynagroove? No thanks. How about using better styli?
e-skeptic wrote:2) The edge does contact the grove wall. In this case, there will be the improvement in tracing distortion claimed for the elliptical type.
No, this is not correct. I suggest you to review the literature on tracing distortion and the pinch effect. Google the "around the bend" page by "jim lesurf".
e-skeptic wrote:Therefore, I would recommend using an elliptical tip only when archiving a record, when fidelity is paramount and the record will not be replayed. For repeated enjoyment of a record, use the conical tip.
This does not agree fully with the AES studies on record wear. Plus you are not taking into account the far longer contact surfaces of better styli.
e-skeptic wrote:Moreover, the higher tracking force taken by conical tips will improve trackability, given the same cantilever design and tip mass, since we know from Newton’s laws of motion that the ability to accelerate to a high recorded velocity is proportional to tracking force. The elimination of harsh mistracking may be more pleasing to the ear than the harmonic distortion due to tracking error
You are oversimplifying. Your paragraph mixes low frequency tracking ability with high frequency tracking ability with tracking distortion. The first is dependent on VTF and compliance, the second is more dependent on effective tip mass, and the third is dependent on the tip's minor radius.
e-skeptic wrote:Have cartridge manufacturers been believing there own advertising art departments and “misunderestimating” the record damage potential of ellipticals these past 45 years, or is this analysis wrong?
My dear friend, i think you're seeing dangers where they aren't.
Welcome to the forum, i like the fact that you are very technically minded. Please check out this thread:https://www.vinylengine.com/turntable_forum/viewtopic.php?t=22894
And then search for threads on distortion, pinch effect, tracking ability and tip mass by user "ld".