Resonance is a key source of failure, and the research proves the point: a single piece of billet material can have 1~3 dominant resonance frequencies, with one resonance frequency dominating the performance of the structural member. These statements are backed up by scientific study into weapons systems, rockets, engines, structural elements, etc. When properly machined, fitted and torqued, a unit composed of several milled pieces will have lower maximum resonance, with several smaller resonance frequencies, compared to an armtube composed of one piece. The elastic and anelastic properties of all four pieces are slightly different, preventing dominant acoustical nodes from developing.
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These stresses damp vibration by forcing the crystalline structure to be more tightly bound, than when in a free state. The torque values chosen introduces preload on the fasteners, and produces hysteresis stresses (basically, inner friction) in the crystalline structure of the metal. The SA1 design is built from four pieces of billet aluminum, milled to tight tolerances, finished, fitted by hand, and torqued to settings determined by experimental observations. While the quality of the bearing materials are a key to success, the proper choice and loading of bearings is just as important.Īlso key to the performance of all tonearms, and especially the SA1.2 and SA1.2B, is the resonance characteristics of the arm “tube”. Traditional deep-grooved ball-bearings are not specifically designed to take an axial load, being better suited for radial loads like a wheel bearing, and they suffer from much higher rolling resistance. The angular error needed to misalign these special bearings, commonly used in high precision machinery, are so severe that they fall well outside the operating conditions for a turntable (if you need an arm for playing in zero gravity, or turned at 90° to earth’s gravity, you will be forced to use a different style of tonearm). Because they have two tapered seats, they will self-align in the presence of a load (gravity), have exceedingly low moving friction and are especially suited to angular and axial loads. You can think of them as acting like a unipivot, but with more than one contact point. These thrust bearings have zero play and are held in contact by gravity. Bearings used for horizontal movement are axial-loaded, angular-contact, thrust-bearings. Key to the performance of the SA1.2 and SA1.2B is the use of very high grade ball bearings. The result is an arm with substantial authority, the same as the original arm, but with even greater refinement and delicacy. Though current Abis SA1.2 arms are substantially the same as the first version of the SA1 tonearm, the refinements in bearings and geometry improve on the performance of the original. With the introduction of the SA1.2B tonearm, along with the improved SA1.2, Abis has improved the performance of the original SA1 tonearm, already recognized by Stereophile as a meritorious design. The SA1.2B is the black version of the SA1.2, and all other specifications are the same. The SA1.2 was added to Stereophile’s Class A list of recommended tonearms in the April 2016 issue. The Yamamoto HS3, weighing a little over 8 grams, is a perfect headshell for the SA1.2, especially for medium compliance cartridges, like the Grados. I am offering special pricing on Yamamoto Sound Craft headshells to existing and future Abis owners. News: You can find Art Dudley’s review of the updated SA1.2 here.ĭealers: You can hear and purchase arms from these fine dealers/builders. The Abis SA1.2B 9.4″ Gimbal Tonearm $2,000 MSRP for black version Please click HERE to be redirected to the Sorane page.
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The ownership of the design has reverted to the OEM. The production and design are exactly the same, being produced in the same facility.
![sme tonearm small copper plug sme tonearm small copper plug](https://www.technologyfactory.eu/data/articles/images/lightbox/big/astell-kern-pee51_17354_5.jpg)
Special Announcement: Abis tonearms will be sold under a new name, Sorane.