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In Reply to: RE: Are you ready for 16 inch tonearms? posted by Waxxy on March 25, 2015 at 21:57:21
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Regards,
Mike.
Follow Ups:
That setup looks remarkably well made for what is most likely a DIY job. I want one!
Maybe we are entering a new era? A modern day "arms race".
Thanks for sharing the video.
That setup actually has quite a bit of tracking error distortion due to its zero-degree cartridge offset. It will have 2% distortion on both inner and outer grooves, which is nearly four times the tracking error distortion of a standard 9-inch tonearm. Had they simply offset the cartridge to 10.6-degrees, there would still be very little skating force and tracking error distortion would be only 0.27% at the three maximum points on the distortion curve.
Best regards,
John Elison
It could still work with a conical stylus and you don't need anti-skate.
Dave
The shape of the stylus has no relationship to tracking error. There will still be skating force with a zero-offset alignment, too. There won't be as much skating force and it will reverse directions at the single null-point, but there will still be skating force. Using an offset alignment for that length tonearm, skating force will be slightly greater than a zero-offset alignment, but still much less than for a 9-inch tonearm.
On the other hand, many of us are perfectly happy with a 9-inch tonearm with offset geometry and adequate antiskating. However, if you really want to get rid of skating force, use a straight line tracking tonearm and eliminate tracking error, too. ;-)
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True but a conical stylus is more tolerant of it.
Dave
It's not that conical styli are more tolerant of anything, they just don't trace the groove as accurately as more sophisticated stylus shapes. In other words, they're just not as capable of getting anything right.
Best regards,
John Elison
John -
What software are you using that calculates tracking error against tracking distortion? And what kind of distortion is it causing?
William Firebaugh suggests that a tracking angle error of 5 degrees yields even harmonic content less than 0.2%.
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.
.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
Edits: 03/28/15
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