A bit of brainstorming resulted in Carbon-tubes, shafts of arrows, fishing rods and nordic-walking-stick as possible candidates. At the same the requirement of highest stiffness only left over the choiceįor Carbon. Status up to that time: Besides the gimbal bearing assembly with its aluminmum bearing holder and the tonearm rest probabely no other subassembly can be reused.ĭue to the point 11 of the specifications -low dynamic mass- the Armtube could only be made from a lightweight material. In comparison the larger diameter ball races used by Rega and Linn are specified at 20mg at best. Even lower 5mg are specified for the ruby balls employed in their EPA-100 tonearm.
Technics specifies a static friction value of mere 7mg for this kind of bearingĮmploying steel balls. This setup results in a first class, finest tuneable and highly stable bearing assembly, that I like to reuse. The associated pivot needles are located in the outer C-shaped gimbal ring. Similar bearing assemblies are located at the top and bottom of the gimbal ring. Counternutsįixate and secure the settings. The two pivot needles that are located in the sides of the gimbal bearing ring can be adjusted very precisely, such that the vertical bearing runs extremly smooth but without slack. Small sized ball bearings are press fitted into both ends of that cylinder. A aluminum cylinder fits into a bore of the bearing cross.
A 12"er requires a lower Offset angle value around 17°. The Offset angle of the bearing cross of the Technics tonearm is around 23°. Therefore one could assume that every arm showed slightly different amounts of damping and a slightly different sonic character. The torque of the screw varies the amount of damping of the rubber damper. The counterweight beam is secured to the cross with a damping rubber damper and a singleĬentral screw. One can see in pics 2 and 3 that the original bearing cross is manufactured from a plastic material.
Also the SME-Headshell is not reusable due to its 23° Offset angle. The S-shaped arm tube can´t be reused for the longer arm.
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