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In Reply to: RE: I have that Jelco headshell... posted by Ivan303 on January 18, 2010 at 19:14:56
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
Edits: 01/19/10Follow Ups:
You're clearly saying that if I take that cartridge mounted exactly as you have it and put it on the 750D I would have an effective length of 225mm. Here's your quote:
"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)."
So, please explain how my 20XL is mounted AND MEASURED with an effective length of 232mm (see the picture...) and the stylus is within a mm or two of your Shure.
"I'll play it and tell you what it is later..." - Miles Davis
Vynyltap's System
Spot the difference:
"You're clearly saying that if I take that cartridge mounted exactly as you have it and put it on the 750D I would have an effective length of 225mm. Here's your quote:
"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).""
nt
"I'll play it and tell you what it is later..." - Miles Davis
Vynyltap's System
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