Have all the original electrolytic capacitors been replaced? This should be done as a matter of course to ensure stability, and may even solve the problem.
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Yes, all of the caps were replaced along with several other parts. The problem appeared to be corrected; the table ran at 33 and at 45 for hours-long periods without a hitch. Then the next day when the table was turned on and tested, the speed lock problem had returned for both speeds. Very frustrating.