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Graham Phantom II 12" - dimensions and overhang

Hello guys,

I come from Europe and recently purchased Graham Phantom II tonearm with 12" armwand.I was missing specs for 12" armwand (in manual are specs for 9" and 10"),so I emailed to Bob Graham and asked him for specs for 12" version. The answer was,that 12" version should be adjusted same as SME V 12". Bob sent me document with SME dimensions as well.

So regarding this document specs are Leff 308,8, overhang 13,2, mounting distance ( Pivot-Spindle) 295,6.
To adjust mounting distance is easy using any quality protractor. I used Acoustic Solid.

http://www.acoustic-solid.de/html/schablone.html

So with mounting distance adjusted to 295,6,here comes the thing.
I should set overhang to 13,2 regarding to specs for SME V 12",but simply
elko
albertporter's avatar
albertporter
4,949 posts
 
Has anyone figured out what's going on with the 12" Graham?

I have one and using the SME 312 mount template the tonearm base angle does not allow the arm to swing all the way to the run out of the LP.

I'm going to check on this again soon but if anyone has more data it would be great.
suteetat
435 posts
 
I just got Graham 12" last month and there is no spec available. The manual is still for 9/10 inch arm only. It only said to look at addendum sheet for 12 inch spec but there is no addendum sheet anywhere in the box that I could find. So far I use only setup tool from Graham which seems to work ok but I am not really overwhelm by the result. I am thinking of trying mint protractor since it seems to really help both JWM 10.5 and Reed 3Q significantly.
sarcher30
596 posts
 
If you use an arc protractor like the Mint LP you will get the correct offset angle. As long as the arc protractor is designed for correct P2S for the arm you're using and you follow the alignment for zenith you will have the ideal offset angle. Just ignore the offset angle on the Graham 12" armwand as it is not correct.

Sean
sarcher30
596 posts
 
Suteetat, If your Reed 3Q is the 12" version then the Mint LP you have for that should work for the Graham 12" as well because they are the same P2S distance 295.6 mm.

Sean
syntax's avatar
syntax
2,193 posts
 
... far I use only setup tool from Graham which seems to work ok but I am not really overwhelm by the result

Of course it sounds awful because it is wrong, the alignment flip is calculated for the short Arm. But don't worry, that way it was in use at CES and all visitors/reviewers were floored :-)
Go for PtoS with 295,6mm and use a 12" Alignment System, Dennesen or similar, then you are spot on
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