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Graham Phantom Anti-Skate. Is it effective at all?

I've had my Phantom Supreme over a year now, and for the most part it's been a pleasure. Beautiful build & sound; awesome VTA and azimuth adjustments. My main hangup had been the headshell; getting a Koetsu to sit flat on the 10" wand seemed impossible because the correct overhang pushed it all the way to the back, behind the main headshell points of contact. Finally I just used 2 plastic washers as shims to get a nice flat mount.

Now my main concern is the anti-skate. I'm not sure if all Phantoms are this way or if it's an issue with my unit. I can't seem to get an effective amount of anti-skate. My preferred method for adjusting anti-skate is to drop the needle in some dead-wax before the label (NOT into a lead-out groove) and adjust so that the stylus creeps *slowly* inwards. With my Graham, I cannot achieve that...it always moves quickly inwards no matter how far out I set the weight. Even physically pushing down on the weight doesn't seem to have much effect in swinging the arm. To me, this seems like the mechanism is not effective, as if I'm running without any compensation. This is very unlike my experiences with a Fidelity Research FR64fx (weight and fishing line) and Clearaudio Magnify (magnetic) -- both have a very noticeably effective anti-skate mechanism, which I can easily dial-in as described above. In fact I just setup a Magnify...it was great!

On my Graham, the pulley & rope system seems to be correctly in place. But without a 2nd until to examine, I can't determine whether this is normal. Could other owners/users of Graham please comment on their experiences with its anti-skate? The situation is OK for now -- I burn hours on my good cartridges very slowly and sparingly -- but I'd rather not have my nice cartridge seeing asymmetric wear over the long-run.

-- Mike
128x128mulveling
mulveling's avatar
mulveling OP
1,774 posts
 
Here is the anti-skate post by Peter Ledermann to which I refer:
http://www.audioasylum.com/audio/vinyl/messages/96/960382.html

Benjie, your method sounds very good, but with a low compliance cart like the Koetsu (maybe ~ 10 when converted to the @ 10Hz standard used by your Benz) I think it will be harder than usual to spot deflections.
mulveling's avatar
mulveling OP
1,774 posts
 
I just measured the distance from spindle-to-pivot as 230mm. Graham doesn't seem to publish this info (since well, the setup is so easy and does not require manual measurements), but at least this seems reasonably sane because this is exactly the published distance for my FR64fx, also a 10" arm.
moonglum
619 posts
 
Dear Mulveling & Benjie,
My experience with a MkII Phantom (9") echoes Mulvelings.

I found that slightly more bias force was required than I expected. So, for a 1.76g VTF I would have expected it to be <2/3 x MAX along the shaft but it was more like <3/4 x MAX.
There was still plenty of headroom so I didn't obsess about it.
Hope this helps :)
mulveling's avatar
mulveling OP
1,774 posts
 
Thanks Moonglum,
That does correlate pretty well to what I'm observing, since I'm running a higher
VTF. Thanks for the sanity check! It would be great to hear from 10" wand
Koetsu users, but I imagine that's going to be very rare -- so it's great to get 9"
wand experiences as well.
moonglum
619 posts
 
Hi Mulveling,
Just to check my own sanity I had another look and it depends on where I take the reference point on the weight?

If the centre of the weight was ref it would be roughly 2/3. If the nearest face to the pivot was ref then it would be slightly less than 2/3 which, I guess, is "almost" accurate. This means that 3g might be feasible at the extremity (?)
All the best....
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