Graham Phantom Supreme?

Dertonarm: "In an uni-pivot like the Phantom the bearing has no off-set - just the mounting area has."

Actually there is an offset angle at the bearing with semi-unipivot designs like Phantom (or Basis Vector, Continuum Cobra/Copperhead, etc.. in the same genre) because there's a secondary bearing to stabilize azimuth so if you draw a line between the main bearing and the secondary bearing, it is offset at an angle matching exactly like the headshell. This clever design allows the azimuth adjustment having no effect on VTA. Same concept in many fixed bearing designs.

A true unipivot like the earlier Graham arms, such as 2.2, used offset angled outrigger weights to do the same thing, and since Graham has a patent on this feature, you don't see other arms doing that.

Anyway, thanks for explaining about the Supreme headshell issue.

_______

Here is a picture from

Graham 12'' Phantom IIs

The red signs are coming from the timeline Strobe (speed controller)

Dear Hiho, you're right.
I forgot - the Phantom is a semi-unipivot design.

Too bad Graham didn't put a detent on the center of the pivot cap so that I could use my feikert. Anyone have an idea how to measure for the exact center point so that I could make my own detent ? I am going to inquire with Graham directly about this.

With experience limited to seeing pictures of the Phantom2S, I'll ask, is it possible to acquire its center point with the cap off? Or other suggestions on how to accomplish use of the Feickert for this measurement? tia
 

From Bob Graham, via Musical surroundsings:

I checked with Bob Graham and while you are correct that the alignment jig is for the 9" arm, there is actually only a 1/2" difference in the effective length of the 9" vs the 10". Mr. Graham recommends moving the cartridge back in the headshell about .05" from what the gauge shows to achieve the proper overhang.

Effective Length: 10" = 248mm
Spindle to pivot distance: 10" = 229.4mm

Looks like an arc protractor is in order. There is still a wee bit of play with the headshell in the jig. Enough, imo that even with a 9" arm, you could be off slightly zenith angle wise.YMMV