I came across very unusual tonearm which is Connoisseur SAU-2 :
Connoisseur SAU 2 Manual - Gimbal Bearing Tonearm - Vinyl Engine
It has regular gimbal bearings but they are set up 45/45 degree to vertical and horizontal.
Such set up enable use of very simply antiskating mechanism in form of antiskating lever joined to inner gimbal ring and weight on lever.
See here:
Saubearing.jpg Photo by pigrot | Photobucket
http://www.vinylengine.com/turntable_forum/download/file.php?id=13906&t=1
Such device looks simply and elegant but are there any disadvantages of that mechanism ?
Connoisseur SAU 2 Manual - Gimbal Bearing Tonearm - Vinyl Engine
It has regular gimbal bearings but they are set up 45/45 degree to vertical and horizontal.
Such set up enable use of very simply antiskating mechanism in form of antiskating lever joined to inner gimbal ring and weight on lever.
See here:
Saubearing.jpg Photo by pigrot | Photobucket
http://www.vinylengine.com/turntable_forum/download/file.php?id=13906&t=1
Such device looks simply and elegant but are there any disadvantages of that mechanism ?
A contemporary review in Hifi Choice by Martin Colloms noted that the bias force reduced towards the centre of the record with this arrangement, but didn't seem to think this was a major issue. He does point out that the reverse would be preferable.
Sure, but in practice it works well enough for a basic tone arm, when using a medium compliance cartridge.
I've set up lots of them.
In a traditional tonearm, the tonearm moves to a greater extent inwards and to a much lesser extent up- and downwards. With the SAU-2 all bearings are working in both istances, that means double friction in comparison. In a traditional tonearm the axis of the vertical movement is perpendicular to the headshell. With the SAU-2 that is not the case, so the azimuth changes to a small extent when to tonearm moves upwards.
a method for changing how the A/S works on this tonearm.
Perhaps remove the centre Gimbal and re-drill the backside of the anti-skating "rod" so that it points backwards (180 ° but inline with the existing location. Thus the farther the arm is from it's rest position, the greater the anti skate. Or just make a new, much longer arm tube to mount in a more conventional way. I have 1 complete arm (less headshell) , and one gimbal bearing assembly sitting in front of me as I type this out.
Perhaps remove the centre Gimbal and re-drill the backside of the anti-skating "rod" so that it points backwards (180 ° but inline with the existing location. Thus the farther the arm is from it's rest position, the greater the anti skate. Or just make a new, much longer arm tube to mount in a more conventional way. I have 1 complete arm (less headshell) , and one gimbal bearing assembly sitting in front of me as I type this out.
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