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Turntable speed stabilty
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Old 14th October 2017, 02:53 PM   #711
Pano is offline Pano  United States
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Turntable speed stabilty
That's an interesting way to do it.
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Old 14th October 2017, 11:31 PM   #712
luckythedog is offline luckythedog  United Kingdom
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Originally Posted by scott wurcer View Post
Still in many cases this give a good indication of relative speed within the accuracy of the clocks in your DAC. I got 33.375 RPM and 33.373 RPM 30 sec later.
Yes, but that misses the point that variation in pitch is far more significant to audibility than absolute pitch......... reasonably, so long as there's no gross-out....

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Old 15th October 2017, 12:06 AM   #713
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Originally Posted by luckythedog View Post
Yes, but that misses the point that
Simply an attempt to double check the frequency calibration.
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Old 15th October 2017, 09:50 AM   #714
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Simply an attempt to double check the frequency calibration.
OK I get it thanks: checking absolute frequency of the recorded carrier tone on the test record.

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Old 15th October 2017, 02:22 PM   #715
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I thought it was just to measure how long it takes for the LP to make a full turn. At a 96kHz sampling rate, the measurement is very fine.
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Old 15th October 2017, 02:46 PM   #716
scott wurcer is online now scott wurcer  United States
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Yes that is true but there should be 1800 cycles of a 1kHz tone in 1.8 seconds at 33 1/3 RPM. So it is a double check on the frequency accuracy of the recorded tone on the LP. This information could be used to scale your results to as good as the clock on your DAC is.
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Old 15th October 2017, 03:02 PM   #717
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Thanks, that got me thinking about a check on the Test LP. I'll post over there.
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