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In Reply to: RE: It's pivoting as it moves across the LP surface, too... posted by Bry on February 09, 2017 at 12:56:09
But the arm and the track are or must be disengaged at the pivot point where there must be a bearing. I suppose that the angle between the track and the arm wand could be frozen a la a more typical linear tracker, but it sure looks like there's a bearing at the juncture between the two. If the arm wand and the track were frozen in the orientation shown, as the arm moves along the track it would drag the stylus out of tangency. At least I think so.
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I think the only difference is that there's a full horizontal pivot even though I imagine the automation will always try to keep it in its center position. Many linear trackers allow for some degree of horizontal pivot and use it to trigger the arm servos.
and so is the Goldmund T3 (TF3?), which is just a glorified Rabco. The Souther type depends upon a slightly dished platter or maybe a slanted carrier, so the stylus carriage travels inward partly due to gravity. All others I know about are air-bearing types that depend upon near zero friction at the rigid junction between the arm wand and the carrier. Many argue that the Rabco approach actually depends upon generating some tracking angle error in order to trigger the servo and therefore is only intermittently at tangency. Some also think the servo itself is noisy. I don't see that this tonearm has any electronics at the pivot that might indicate such a servo mechanism. Yes, that's what I was thinking... a full horizontal pivot. It would be fun to see a video of this thing in operation. Maybe on Youtube???
The low end linear trackers generally had a simple forward/reverse system where the arm would trigger sensors when it deflected to the right or left and this would turn on the servo motor so they repeatedly introduced some small degree of angle error but what's probably more important is how gently the arm was nudged in response.
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