Tracking error distortion audibility


I recently unpacked my turntable from a couple of years of storage. It still sounds very good. Several times during playback of the first few albums I literally jumped from my chair to see which track was playing as it sounded so great. After a while I realized the "great" sound was always at one of the "null" points. They seem to occur at the approximately the proper place (about 125mm from spindle) and near the lead out groove. Questions:
Is this common? I have improved the resolution of my system since the table's been in storage but I don't remember hearing this before.
All others geometric sources of alignment error not defined by the null points (VTA, azimuth etc.) are essentially constant through out the arc correct? If so they should cancel out. I assume the remedy is a linear tracking arm but I am surprised at how obviously better the sound is at these two points.
Table - AR ES-1, Arm - Sumiko MMT, Cart. - Benz Glider, Pre - Audible Illusions, Speakers - Innersound electrostatic hybrid
Do linear arms really sound as good across the whole record as I hear at only the nulls with my set-up?
feathed
Feathed,

I see that you are new to Audiogon. Perhaps if you sincerely ask questions, listen when people answer, and think about what they answer you may just learn something new.

You started this thread with the assumption that tracking distortion is somehow inherent in vinyl playback and cannot be avoided. You have two of the most knowledgeable setup guys around here telling you that your assumption is bullshit, but you insist that they are misguided, mis-informed or just plain wrong.

As soon as you told me pivot to spindle distance doesn't matter with cartridge alignment, especially tracking error distortion, I knew it was no use trying to discuss this with you.

Good luck to you!
Dan_ed beat me to it!
I was just about to write a similar response although I wasn't quite believing what I was reading.
Here was a guy (Feathed), who wrote a question about a perceived problem in his arm/cartridge set-up "Tracking error distortion audibility" yet continues to defend his set-up and argue illogically against any proposed suggestions to help him?
I have 2 different arms and cartridges and do not hear this distortion and I have heard at length 2 parallel tracking arms (the Air Tangent and the Rockport) and hear no differences to a well set-up pivoted arm.
I am at a total loss as to the intent of his post, but perhaps he was simply looking for an argument?
I am really hoping that Feathed just got mixed up a little and that he'll come back with a more open mind.
Feathed also made the same post on AudioAsylum, if you haven't seen it. Here is a quote from him:

"I just hope I get the alignment on the Alphason perfect to hear it at it's best. I suppose I should get my alignment template out and check for problems with my current setup. I hesitate though as my eyes are terrible compared to 10 years ago when I mounted the cartridge."

Looks like it's been 10 years since he's checked the cartridge setup.
With such knowledgeable folks as Raul and Thom attempting to carry the flag of reason, I'm a little hesitant to join the march. But I'll go ahead and step in line anyway.

Feathed stated "I on the other hand believe the presence of a slotted headshell is explicit approval to tweak." So I must ask, is there an industry standard for stylus tip location relative to the cartridge body mounting holes? Simply looking at the variety of body designs and cantilever lengths the answer must be no. Therefore, the slotted headshells (or slotted mounting base such as the SME) are intended to accommodate a variety of cartridges to be correctly mounted on a given arm/headshell. Fortunately, they also allow for minor adjustments if an arm is not mounted precisely.

I have been in this audio hobby for roughly 40 years and have included vinyl playback for the entire time. This is the first time I can recall anyone suggesting that overhang is arbitrary and can be set anyplace (i.e. at the end of the arm) at the user's discretion.