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Scott Dorsey Scott Dorsey is offline
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Default Ever heard an exotic high-dollar turntable playing LP's? Hugedifference? No?

In article , Trevor wrote:
On 9/08/2018 9:04 AM, Pamela wrote:
I've never understood this properly but on a linear arm turntable,
wouldn't there still be a lateral force experienced by the stylus
(which some sensor then picks up and activates the arm servo)?


Of course. Should be no more than with any other turntable/arm combo though.


My arm has an anti-skate mechanism that adds adjustable amount of lateral
force to keep the stylus centered perfectly in the groove. You can't do
that with a linear-tracking arm... the inner edge of the groove -has- to
have more force on it in order to push the arm down the support rod. (The
servo control reduces the amount of force needed but it just helps what is
already there).

Isn't that lateral force going to introduce at least some audio
distortion?


The lateral force by itself should not introduce very much distortion,
and no more than any other turntable (probably less). It's an
unavoidable consequence of dragging a rock through vinyl. What you do
gain is the stylus is always at the proper angle to the groove, or so
close as makes no difference. Whether you introduce other problems
though is another matter. Funny though that some people forget the lathe
cutter head suffers from these same problems and is already embedded on
the disc. :-)


The lathe cutter is driven mechanically by a leadscrew. It is always
centered in the groove because it's making the groove.

With an Edison cylinder, the playback stylus is ALSO moved down the record
by a leadscrew, so with that configuration you CAN get perfect centering.
You can't do that with an LP though, because the pitch varies.
--scott
--
"C'est un Nagra. C'est suisse, et tres, tres precis."