The Graham 1.5 has a balance CG below the pivot bearing. If you look at the arm like a sideways "L" (------i)then perfect balance happens when the arm is level, the bottom of the i is heavier then the dot in the stable config. Any up or down change from level (gravity) will have an impact on tracking force +,-. If the back of the arm is low and set for a thin record playing a thick record would increase VTF and of course change VTA a bit. The greater the config from level the greater the change would be. I set my VTA by ear then reset the VTF at that record height using a stand for my gauge then set VTA again. So far for me the VTA has a greater impact on sound that changing the VTF from recommended value. My arm is about level and VTF changes are, .o6 grams or so. I am a set it and forget it type of user so I will set it for the best compromise and leave it. I have regular records (120 gr?), 180gr and some 200gr. Looks like if I had a record in the 150-160gr range that would do me.
I image "stable vs neutral balance" impacts other parameters as any up or down or sideways movement is now a bit different because of the CG change.
I image "stable vs neutral balance" impacts other parameters as any up or down or sideways movement is now a bit different because of the CG change.