In article , Trevor Wilson
wrote:
David Looser wrote:
"Trevor Wilson" wrote



As for vinyl, a typical minimum groove radius is 6cm. That means a
linear velocity of about 210 mm/sec. So the wavelength of a 60kHz
signal is .0035mm. What is the sidewall contact area of even the
smallest stylus?

**This one seems to do the trick:

http://www.dynavector.com/etechnical/microstylus.html

Due to the deformation of the wall, simply having a physical contact area
of 2 microns does not gurantee that is the actual resolution.

The cartridge has an upper frequency limit of 100kHz.

How was that value measured? I can't see it on the above page.

I have some 10kHz square wave CRO photos somewhere around the place.
I'll post them in a week or two. I've examined this stylus under a
binocular microscope. I was more than a little suprised to see pretty
much what the photos show. The stylus is a beautiful thing.

Slainte,

Jim

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