Cartridge question

Dear @viridian : You are just rigth: VTF and stylus shape are different concepts.

Several years ago Ortofon left very clear why they suddenly and especially in its MC models changed to way higher VTF that in the past because the MC audiophiles made and ask if that heavier VTF makes higher damage ( than normal VTF ) to the grooves or to the stylus tip and Ortonfon answer was NO and made the overall explanation.

Ortofon MC Diamond and Verissimo, both its top of the line, runs at 2.5gr.-2.8grs. VTF with Replicant stylus tip.

So it’s whith out sense or stupid to think about that " wear " on the grooves due to those two different concepts.

R.

viridian

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• Posted by jcarr (M) on January 7, 2005 at 17:41:40

  In Reply to: Re: The virtues of a spherical stylus posted by Tetrack on January 7, 2005 at 08:13:53:

   

I have some stylus articles that Namiki published when they introduced the Microridge (also known as microline among other names) profile, so let's look at the manufacturer's figures.

A 0.7mil spherical stylus (18um radius where the stylus contacts the groove) has a contact area of 30.5um(sq.) - one wall.

A 0.5mil spherical stylus (13um radius where the stylus contacts the groove) has a contact area of 23.4um(sq.) - one wall.

A 0.3x0.7mil elliptical stylus (18umx6um radii where the stylus contacts the groove) has a contact area of 20.6um(sq.) - one wall.

A line-contact stylus (45umx6um radii where the stylus contacts the groove) has a contact area of 46.7um(sq.) - one wall.

A microridge stylus (75umx2.5um radii where the stylus contacts the groove) has a contact area of 62.1um(sq.) - one wall.

hth, jonathan carr"

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so line contact is +57% more contact surface than spherical

microridge is +100% more contact surface than spherical

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IF correct about elliptical (really?)

line contact is +130% more contact surface than elliptical

microridge is +210% more contact surface than elliptical

then there's SAS; Shibata; van den Hul; gyger 2; ........

Dear Viridian :  Gyger makes the Replicant 100 for Ortofon and in its site you can read the Replicant 100 specs and use a radius of 100, that's why the name Replicant 100.

Giger makes other model ( s) with bigguer radius. Here you can read the overall information about coming from an expert retipper:

https://forum.audiogon.com/discussions/replicant-100-stylus/post?postid=2326742#2326742

https://www.ortofon.com/mc-diamond-p-1000-n-1579

R.