I bought A old Fisher MT-6330 DD turntable, I would like to bring it back to spec performance. At best is has a peak 2S wow at 0.093% giving a DIN W&F at 0.037%, but more often the peak is 0.14 and DIN 0.05 . It is very sensitive to user adjusting speed pots, and speed oscillates several seconds if platter is disturbed.
Almost like the servo gain is too high .
spec is 0.035% presuming DIN as source is the german manual.
I can find settings for reference voltage and DC balance, but now setting for servo gain.
I am going to clean potmerers for speed setting both internally and the user speed pots, and set the motor drive DC balance according to service manual .
But What about adjusting the servo gain when there is no variable resistor for i?
What else can I do?
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