Ammonite Acoustics custom improved mounting collars for Jelco tonearms have been re-designed and are now even better and easier to use. Key improvements over the Mk1 collar include: The central pillar hole now has a sharp side-cutout. This means that the arm pillar is now held gently, but firmly, against two vertical’knife edges’, so there is no longer any possibility of the arm pillar leaning to one side. If your armboard and platter are aligned to the same level plane, this new collar will guarantee that the Jelco arm pillar will be truly vertical to that plane. The grub screw is still a large 6mm stainless steel item, but it is now longer and fitted with an integral nylon end stub. The overall diameter of the collar is now the same as the standard Jelco collar. This means full compatibility with any armboard cut for a standard Jelco arm. Why do I need a different collar for my Jelco tonearm? Have you ever tried to set the azimuth of a Jelco tonearm correctly? Just when you think you’ve got it sorted, it’s off again! That’s because of the standard collar, while beautifully machined, provides very poor vertical support of the arm pillar; and the tiny set screw typically pushes the top part of the arm to one side, almost guaranteeing that the arm will not be properly set up. Is the collar compatible with other tonearms? The collar is fully compatible with standard Jelco collar mounting templates, and all Jelco manufactured derivatives with 18mm diameter pillars, including Audioquest, LAD, Ortofon, Roksan. Some Sumiko variants have a smaller 16mm pillar, so are not compatible.
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