Fitzcaraldo215
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- Mar 4, 2016
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There was probably no better on the planet at that time than the Goldmund, but far too rich for my blood.So the platter was made concave, slightly lower in the middle than the perimeter? That would make sense in helping the clamp flatten any warping. My HK's mat with the recessed label area somewhat addressed the same issue.
Incidentally, the Oracle also had a recessed area in the mat for the label. However, a shaped washer under the mat at the center spindle pushed the center of the label area under the mat and record up slightly well within the outer radius of the clamp, which had a much larger radius, slightly less than the label. Then, the clamp via leverage was better able to push down on the grooved area of the LP out to the outer grooves. However, that screwon clamping action over the washer did cause some LPs to fracture slightly around the center hole under the label if applied too tightly. No big deal, though, and the label held them together. It did not affect playback. Also, severe disc warps were not entirely removed by clamping.
My ultimate tonearm on the Oracle was an air-bearing linear tracker from Eminent Technologies. I still have the entire old Oracle-ET II rig packed away in a box with WISA pump, air storage tank, pressure gauge, etc. Ah, those were the days. Beautiful, tangible, easy to understand mechanical engineering.