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.

• The Scott Wurcer python script for polar plotting [1]
• The DIY Audio thread which is somehow the successor of the Pink Fish Media Thread [2]
• The Korf Blog has some good Insights in the Measurements of Speed Stability [3]
• The Pink Fish Media Thread [4]
• A Blog Entry regarding the Analysis of Turntable Speed Stability [5]
• A Method to do Polar Plots "by Hand" [6]
• IQ FM Demodulation of Wow and Flutter Signal in Software [7]
• Python Audio Restoration Suite [8]