I'm using that arm on the Super Scoutmaster, first the 9" and now the 10.5" version. The problem I am having is that the arm mistracks badly on some audiophile records. I've tested it using test discs, and it basically only makes the first out of four test tracks (in order of severity).
I assume that most of it is bias related, since that's what the test tracks are for, and when I pull a bit on the bias wire of the JMW, it stops mistracking.
The problem is that VPI doesn't believe in bias, and althought they supply a crude wire and weight thing, they seem to imply that the JMW doesn't need any. There are not enough rubber rings provided with the 10.5" arm to bias it to the point where it can track the second test track.
VPI suggests to increase the tracking weight, but I'm already at 2.2 grms with my Dyna XV1S, which is towards the end of max.
Any suggestions? Is tracking only a function of weight and bias or is there something else that I have overlooked? I'm nitpicking a bit as the issue is only obvious on some recordings, but still, it is annoying to have it. I don't remember any such issues with my old Linn.
Thanks for any help.