Leonard Caillouet schrieb:

Of course it would explain it. A belt that is stretched can ride onto the
larger part of the spindle causing this effect. If adjustments were the
solution, he would not have experienced such dramatic changes in speed.

Ok, you're right, i see...

I never found these effects with belt driven turntables.

I am not familiar with the model, but if it is belt driven it likely needs a
belt and the spindle cleaned. If it is direct drive, there is likely a
defect that needs repair.

If is direct driven please come back to my pots or switches.

Udo