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How to reduce L75's tonearm's dynamic mass.
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Richard

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Joined: 11 Aug 2006
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Location: San Francisco Bay Area, USA

PostPosted: Sat 26 Jan, 2008 11:21 am    Post subject: Reply with quote

Hi, James.
Yes. I think that your're onto something here for the simple reason that horizontal vs. vertical dynamics are, of necessity, different. I mean, tracking force, for one thing, is applied vertically, not sideways. And so they are in the record grooves themselves.

What I don't know is how it comes out in the listening. Can we hear it? I suspect that we can, especially as the tracking forces go down. This may explain why some people are gravitating toward higher force, lower complaince styli and heavier arms these days.

I'm interesting in hearing more about what you said about spring vs. weight antiskate designs. Do you think that Lenco's weight system is close enough to the arm bearings? Also, what's your opinion of magnetic antiskate methods, such as Thorens used?

I believe that Dual used what I'd call a "high-compliance spring" design in their original application of antiskating, when it appears that they were applying brainpower and some finesse to the issue.
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Richard Steinfeld
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james_texas

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Joined: 24 Jan 2008
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Location: Texas, USA

PostPosted: Sat 26 Jan, 2008 6:24 pm    Post subject: Reply with quote

I have an AR, and will be getting a Thorens shortly, but all turntables follow the same physics.
You can determine the horizontal inertial mass added to your Lenco if you know the counterweight and distance from the pivot.
It's m*(d/r)^2

where

m = hanging weight mass
d = distance string attach point to pivot
r = distance stylus to pivot

Let us know what you measure.
It may be small enough that it's nothing to worry about.
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