Cartridge question

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

@elliottbnewcombjr 

buy an advanced stylus shape: Line Contact/Microridge/Shibata/SAS: they cost more, but last much longer

All these advanced profiles have far smaller contact areas with the disc.  So the friction is concentrated over a smaller area and the pressure per unit area will be greater, thus wearing the stylus (and disc) faster.  Furthermore, advanced profiles deliver their performance improvements because the contact area is small and the disc is thus 'read' more faithfully.  The fine line contact soon enlarges with wear and some of the performance edge is lost.

It is important to remember that something can rarely be had for nothing.

clearthinker

you have it absolutely backwards, is this a joke?

look at row B in the chart

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The cutter makes the groove, making 100% groove contact

advanced stylus shapes get closer and closer to the cutter shape, each type on the chart making progressively more contact with the groove walls.