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Speed Stability of Record Players

When I tested one uf the used Record Players I bought, the Feickert Adjust+ software showed quite some speed deviations. I was curious to find out more and came across a number of threads on different Internet-Forums regarding plotting the results of a Speed test as polar plot to get a better idea on how the deviation looks like and how to find out the reason of the deviation.

Here is a Collection of Links to keep together what I found out so far.