re:VTA
fleshler
where it appears more critical to adjust is for differences in the LP cutting angles.
the angles that get cut into LPs "the included angle" vary. The European cutting standard does not match the American one. What does this say about the same album title, one an American pressing, the other Dutch?
Every time the cutting stylus is changed (every 10 hours or so) the replacement stylus is never put in at exactly the same angle. Is the conspiracy growing? Ask the folks that cut the records. I have.
It is my opinion therefore that since the cutting angles vary, even with records of same thickness, that unless someone can tell me here on this thread, that they are able to visually see the angle of the cut in the record (the included angle), then VTA adjustment for those so inclined, should be done by ear, since the variables that exist outside that actual record - different rooms, gear and the way we hear, all factor in to what we will hear. Just remember your tonearm, due to physics will change VTF when you adjust for VTA. Differences heard may be due to this. VTF needs to be reset. Only one tonearm keeps VTF the same due to a patented system.
If someone is not VTA anal, and just wants to enjoy the music, use a stylus profile that is not as affected by VTA changes, like a Conical. Ask the cart manufacturer or retipper. You will hear less detail, however you can adjust for tonality once, be done with it and enjoy your music.
Now about those folks that use USB Digital microscopes to set VTA.....