Vinyl Asylum

Welcome Licorice Pizza (LP) lovers! Setup guides and Vinyl FAQ.

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Basically, that's it

Posted by B.K. on January 19, 2010 at 00:30:36:

Basically, that was what I was trying to show.
The stylus is about 7.5mm from the front of the headshell, so if the Shure V15VxMR was mounted on a Jelko SA750D it would produce an effective length in the order of 4mm less than the nominal effective lenght (229mm). The nominal effective length occurs when the stylus is about 3mm from the front of the headshell - see Jelco drawings.
The minimum possible effective would variy for each cartridge because the distance from the stylus tip to the mounting bolts is not a constant - for example a Denon DL103 at the same position in the headshell would produce an effective length about 6mm short of 229mm. That's why most tonearms have slots in the headshell.
However, I disagree with your last point: the mounting distance does not change the effective length. It just changes the null radii.
BK