Hi Fredg,
The starting place for vta is the diamond itself should be a 90 degree angle to the album surface or the diamond sits perfectly straight up and down in the album groove. You are trying to replicate the original cutting stylus angle, which also requires, most phono cartridges to be slightly twisted in the head so that the stylus tip rides in the groove correctly. This would be a hard explanation on a forum like this, I'll look around and see if I can find a link for you.
Tim
The starting place for vta is the diamond itself should be a 90 degree angle to the album surface or the diamond sits perfectly straight up and down in the album groove. You are trying to replicate the original cutting stylus angle, which also requires, most phono cartridges to be slightly twisted in the head so that the stylus tip rides in the groove correctly. This would be a hard explanation on a forum like this, I'll look around and see if I can find a link for you.
Tim