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Turntable speed stability test

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Turntable speed stability test

Postby davidsrsb » 14 Sep 2017 08:06

Over on diyaudio, we now have a simple and efficient speed stability measurement working.
http://www.diyaudio.com/forums/analogue ... ty-42.html post #418

Written in Python, it analyses a 4 second recording of a ~3kHz test tone found on several test records and produces a nice polar plot showing speed variation

Some Technics Direct Drives are measuring amazingly well
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Re: Turntable speed stability test

Postby analogaudio » 14 Sep 2017 17:34

Care to mention "names"?
Ted

Technics SL1600mk2, Ortofon VMS30, modified TEAC AH500 as a preamp, Bryston 4B ST amp, Harbeth M40 speakers, all making musical magic :-)
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Re: Turntable speed stability test

Postby davidsrsb » 15 Sep 2017 02:05

In the last few weeks of that very long topic, there are a few polar plots of several DD examples with stability so go that the residual is suspected to be the test record.
Meanwhile some belt drives like my own STD-305 have turned out to be really bad - my example is due to a suspension fault that is allowing the belt to slip
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