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RE: Null points for 7" discs?

Posted by flood2 (A) on July 8, 2017 at 02:42:06

In Reply to: RE: Null points for 7" discs? posted by John Elison on July 7, 2017 at 21:41:46:

"You want your turntable optimized for the vast majority of records, not the outliers"

That's what I said..... look at the JIS standard...53mm for innermost radius for a 7". That would be an outlier with respect to your RIAA reference...but not to the JIS standard. As it happens, a large proportion of my 7"s are cut loud and go in to 53mm. They are cut in the UK, Germany, US, NZ, Australia and Japan. None start at 84.1mm but 83 to 83mm.

You are missing the point as usual about your assumptions on the distortion calculation. They are oversimplified and you need to consider the higher groove modulation for 45rpm singles. Consequently it is of greater importance to minimise the distortion at the innermost grooves as the increase in distortion due to amplitude and radius of curvature is greater than your calculator predicts. This requires an adjustment to the inner null which necessarily involves a reduction in the Rmin value used for Lofgren A.

Also, I take exception to your labelling of the second graph as "Flood's Universal Tonearm Alignment" - you are deliberately misrepresenting me. It ISN'T a universal alignment. For you to say that implies you don't understand what I am saying. You can't seem to get your mind off it for some reason.
It is Lofgren A applied to a modified envelope that still produces 2 null points on a 7" record.

Please correct that.

Regards Anthony

"Beauty is Truth, Truth Beauty.." Keats

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