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

Showing 2 responses by jloveys

May I jump in here to give an honour mention to the excellent and easy to use Graham cartridge alignment device that always is spot on with any cartridge I mounted, doubled checked carefuly with two points protractors. This clever device is a pleasure to use because you know alignment is correct BEFORE the armwand is mounted on the arm. I wish that all tonearm designer include this kind of device with their tonearm. It is safer for our valuable cartridges.
I read the thread about Mint protractor and noticed that some Graham alignment gauge users find differences in alignment. In my experience there are differences from one to another, some have some "play" in the foldable plastic device , other not. I had to return 3 to have a good one with no "play", and here I have no error anymore. I don't say it is the ideal and absolutely perfect way to cartridge alignment but a smart and SAFE way and certainly an idea to perfect for the future tonearm designers.