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RE: RPM's and Strobe

Are you using the battery powered strobe light with the KAB strobe?

Does the VPI strobe agree with the KAB strobe when using a florescent light to illuminate the VPI strobe?

How did you mark your turntable platter for counting revolutions?

I put a white dot on my platter when I used to count revolutions on my Sota Millennia Vacuum. However, I never encountered the problem you're having. My platter revolution counting always agreed with my strobe disc measurements. In fact, I would set the platter speed using the strobe disc before counting revolutions in order to get it very accurate to begin with. Then, I would time revolutions with the clock in my handheld calculator that also contained a special program I wrote to calculate percent deviation from perfect platter speed. Now, I use a Phoenix Engineering RoadRunner to maintain platter speed and I highly recommend the Phoenix Engineering products.

I would recommend replacing your SDS with the Phoenix Engineering Eagle power supply and RoadRunner tachometer. These components will automatically adjust your turntable for the correct platter speed each time you turn it on in addition to providing electronic switching between 33 and 45 rpm. Feedback from the RoadRunner to the Eagle will maintain exact platter speed during motor warm-up and you will always have a readout of your platter speed to an accuracy of 0.003%. Check out the YouTube video at the link below.

Best regards,
John Elison

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