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This is an analog-heavy site, so I hope a few will appreciate my approach to stabilizing my JMW 10.5i with magnets, for truly exceptional results. The following are copied from my posts on vpiindustries.com and whatsbestforum.com
The specs are:
1) Two Stock 3mmx1.5mm (3/16" x 1/16") N52 Neodymium round magnets in the arm base from K&J Magnetics (https://www.kjmagnetics.com/proddetail. ... 52&cat=168); and
2) Two Custom 20.7mm inner diameter, 31mm outer diameter, 0.8mm (1/32") thick N35 Neodymium ring magnets from SM Magnetics (https://supermagnetman.com/collections/neodymium/rings)
All magnets are axially magnetized. Because the various VPI arms may slightly differ, it's important to accurately measure the inner diameter with a caliper - and I measured 20.64mm for the base, hence the 20.7mm ID spec - and for the outer diameter, the goal was to place the opposing magnets right over the outer edge of the ring magnets (hence the 31mm OD spec).
Keep in mind that K&J Magnetics does not make 0.8mm thick magnets, only as low as 1.6mm, and that's why I went to SM Magnetics. The reason for going for 0.8mm thick rings is to be able to stack them up, if need be, and it was necessary (quicker and stronger stabilization).
Azimuth adjustment can still be achieved by severe rotation of the counterweight, or by moving the round magnets a tiny bit off center. VTF impact was minimal, because of where the round magnets were placed.
I would not go lower than N35 grade rings, so N28 for example won't do. I feel that any VPI unipivot arm can be stabilized with this technique.
A quick demonstration movie can be found at https://youtu.be/Y2z3g6xyshM
One of the additional benefits of using repulsive forces is how quickly VTF stabilizes on the gauge, something that is not true with the original arm. The other not so obvious benefit is that the arm's azimuth is no longer affected by the wires sticking out of the arm, because of the considerable repulsive force. The obvious benefit is that the arm is extremely stable during play. And the sonic results: stable imaging, much more accurate timbre, very taught and tight bass.
The specs are:
1) Two Stock 3mmx1.5mm (3/16" x 1/16") N52 Neodymium round magnets in the arm base from K&J Magnetics (https://www.kjmagnetics.com/proddetail. ... 52&cat=168); and
2) Two Custom 20.7mm inner diameter, 31mm outer diameter, 0.8mm (1/32") thick N35 Neodymium ring magnets from SM Magnetics (https://supermagnetman.com/collections/neodymium/rings)
All magnets are axially magnetized. Because the various VPI arms may slightly differ, it's important to accurately measure the inner diameter with a caliper - and I measured 20.64mm for the base, hence the 20.7mm ID spec - and for the outer diameter, the goal was to place the opposing magnets right over the outer edge of the ring magnets (hence the 31mm OD spec).
Keep in mind that K&J Magnetics does not make 0.8mm thick magnets, only as low as 1.6mm, and that's why I went to SM Magnetics. The reason for going for 0.8mm thick rings is to be able to stack them up, if need be, and it was necessary (quicker and stronger stabilization).
Azimuth adjustment can still be achieved by severe rotation of the counterweight, or by moving the round magnets a tiny bit off center. VTF impact was minimal, because of where the round magnets were placed.
I would not go lower than N35 grade rings, so N28 for example won't do. I feel that any VPI unipivot arm can be stabilized with this technique.
A quick demonstration movie can be found at https://youtu.be/Y2z3g6xyshM
One of the additional benefits of using repulsive forces is how quickly VTF stabilizes on the gauge, something that is not true with the original arm. The other not so obvious benefit is that the arm's azimuth is no longer affected by the wires sticking out of the arm, because of the considerable repulsive force. The obvious benefit is that the arm is extremely stable during play. And the sonic results: stable imaging, much more accurate timbre, very taught and tight bass.
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