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RE: I am indeed!

Posted by John Elison (A) on March 28, 2015 at 19:10:59

In Reply to: RE: I am indeed! posted by newvinyl on March 27, 2015 at 16:29:12:

I developed my own Excel spreadsheet to calculate and graph tracking error and harmonic distortion. The distortion curve is also know as the weighted tracking error curve. You can download my spreadsheet at the link below.

The equation for distortion can be found in Equation (22) of Erik Lofgren's paper, and Equation (4a) of H.G. Baerwald's paper. You'll need to read those papers for a complete derivation, but here is the equation I use in my spreadsheet.

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As you can see, harmonic distortion is function of record speed, stylus-tip velocity, tracking error, and groove radius. Consequently, it is certainly possible to have less than 0.2% distortion at 5-degrees tracking error when groove modulation level (stylus-tip velocity) is very low. In my graphs, distortion is based on a record speed of 33.3-rpm and a stylus-tip velocity of 10-cm/s. Given these parameters, 5-degrees of tracking error will produce harmonic distortion above 2% except in the outermost groove area where it will fall slightly below 2%.

Best regards,
John Elison

• John Elison's Tonearm Alignment Spreadsheet   (Open in New Window)

Edits: 03/28/15

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