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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
elko OP
3 posts
 
I wrote it to thread 12 inch Graham Phantom
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923 posts
 
Hi

I am dealing with similar issues after upgrading our 9" Phantom to 12" Phantom II supreme. We needed the 12" arm wand for the new TTWeights Momentus Duo Drive table we just got in for demo and sale, which has an outboard arm pod.

I am ordering a new Mint LP protractor for the 12" arm and this is the info I got back from Yip atMint LP. The numbers are in mm. and recommend the Mint LP unit highly. The one I had for the 9" version worked extremely well.

"For the 12-inch Phantom tonearm the spec is totally different:
295.6/308.8 Mounting Distance/Effective Length."

Hope that helps.
elko OP
3 posts
 
But that is the thing,that these specs,which Bob sent me,does not work with me.
When I adjust mounting distance to 295,6mm,I simply cant make overhang 13,2mm. 13,2mm overhang is for Baerwald scheme.

I am getting around 16mm and than screw,which is holding cartridge in headshell hits the inner edge of headshell and I cant move cartridge anymore.
It seems to me,that Leff is bigger than 308,8. I made some calculation for Baerwald scheme and what can work with me is this:

Leff 313
Mounting distance 300
Overhang 13
Offset angle 17,37

With these numbers,I will be able to adjust cartridge in headshell correctlly.
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