Cartridge question

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.

viridian

chart below indicates what is normally understood: elliptical has MORE contact area than Spherical

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I have to believe Johnathan Carr made a typo in the comments you cited

• 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."

**** chart above shows .3 x .7 = 40um****

which fits common understanding

"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