Azimuth "recording"


I recently purchased a Technics 1210 GAE, and I am loving the detachable headshell.  I have 3 cartridges in rotation 2 MC and one Mono.  I wonder if anyone has any tips on how to "record" azimuth for quick resetting.  I dutifully have recorded VTF, VTA, bias etc. for each cartridge for fast switching - but I am hoping to not have to pull out the test record and fozgometer with each switch  to set AZ when I have other listeners such as my wife present. Usually only happens when I switch from MC to mono and back.

The azimuth for all but one of the cartridges (my mono) is fairly off when fastened to the arm in what I would consider the  "straight" position.  Once the azimuth is properly set the audio difference is very noticeable.  I have though of snapping a photo of the cartridge head on with one of those plastic AZ tools to rough it in for quick switching so I can at least eyeball the angle. Any tips?

Cheers


slashsmil

Showing 5 responses by lewm

I hope we can all agree on one point: There is no need to worry about crosstalk with a mono cartridge.  In the case of a mono cartridge, one would only adjust azimuth so as to make sure the stylus is sitting symmetrically in the groove.
The funny thing is that a few years ago I might have said, and did say, that I would not even use a tonearm that did not provide for azimuth adjustment.  Now I am not so sure, because it is as easy to get it wrong by a tiny amouint using the added luxury of an adjuster, as it is to get it right by the same adjuster.
Gosh. I guess I am not anal enough for this hobby. MC, in my defense, the OP did say something about using the Fozgometer, etc, which indicates he is aiming for electrical perfection, minimizing crosstalk. So I was just describing my own current state of mind, which is that the downside of setting the stylus tip at any angle to the groove walls (for a stereo cartridge), aberrant contact with the groove AND aberrant stylus tip wear, for me is more obnoxious than setting the stylus square in the groove and trusting that the manufacturer did not screw up the positioning of the coils too badly. Yes, the crosstalk data in db may not end up optimal, but the distortions and premature stylus wear associated with the alternative approach are worse. I hasten to add "in my opinion". Plus, speaking to the OP’s actual question, adopting the endpoint of stylus seating in the groove simplifies setting azimuth; in most cases 90 degrees works fine. I probably should have added that point.
First of all, you need not be concerned about azimuth  adjustment for a mono cartridge. Since the signal is mono, there is no issue of cross talk. The only thing you should worry about is that the stylus tip sits correctly in the groove. For that I suggest you try for a 90° relationship between the stylus tip and the groove If you cannot actually visualize the stylus tip.. As to the question of setting azimuth for a stereo cartridge, there are two schools of thought. One is to adjust electrically for the least amount of measurable cross talk between the two channels. The other is to forget about that, and set the stylus tip symmetrically into the groove. The downside of electrical azimuth adjustment is that the stylus tip may end up at an angle to the groove walls such that the intended contact patches are not where they should be. This results in both distortion and aberrant stylus wear. After years of adjusting for electrical perfection, I have lately chosen to worry only about seating the stylus tip symmetrically into the grooves. It seems to me the lesser of two evils.