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The Optimum Pivot Position on a Tone Arm

In the past many studies were made and reports published on the low-frequency resonance of tone arms. However, it seems that no analysis has yet been made of where on a tone arm is the best position for its pivot. New concepts of a static center of gravity and a dynamic center of gravity on a tone arm are introduced, in relation to these two points, and the optimum pivot position is analyzed. It has been found that when a tone arm receives a force from the stylus tip or when any vibration is conveyed to the tip from the pivot position, the translational motion and the rotational motion of the tone arm cancel each other out. Thus the optimum pivot position of a tone arm could be computed and the optimum pivot position theory coupled with the theory of dynamically damping a tone arm, as proposed by other scholars and engineers in the past, to achieve a more effective damping of the low-frequency resonance of a tone arm.

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JAES Volume 27 Issue 9 pp. 648-656; September 1979
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