A70BBen wrote:This won't be much Help but the AT6 tonearm (and ANY tonearm among the Autoslim chassis) is not the best at lateral tracking error. That's because it is shorter than optimum, for compactness; and because when a cartridge is set up straight in the headshell, the greatest tracking error is at the INNER grooves where accurate tracing by the stylus is most critical. This wasn't so important in the AT6's era when styli were almost exclusively spherical.
If you are having problems with sibilance at the inner grooves, check your tracking weight first, make sure it is sufficient. The AT6 will not operate at extremely low tracking force anyway, and as such it is not suited for small tracking radius ellipticals such as 0.2 x 0.7 mil. A 0.4 x 0.7 mil is probably optimum. Then I would try to align the cartridge by eyeball for minimum tracking error at typical end of records. This will make the tracking error higher on the outer grooves but it is less critical there.
The stylus I have is a Pfanstiehl 4604-DEC, which is a 0.3 x 0.7 mil elliptical. The sibilance I am getting seems to be at the outer AND inner grooves. Tracking weight is set at a hair over 3g (using a digital scale), which is what the recommended tracking weight is on the stylus package.
So, I should use a "standard" mirrored protractor like the one I have, and just align to the innermost bullseye grid, and not worry too much about the outer one?