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George's Pro Sound Company George's Pro Sound Company is offline
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Default Turntable "suspended in a vacuum" to prevent vibrations?


"Scott Dorsey" wrote in message
...
muzician21 wrote:
On this page

http://www.bornrich.org/entry/top-10...ve-turntables/

Look at number 5 - the description of the Continuum Caliburn includes
this phrase:

"The turntable employs a magnetically levitated magnesium platter,
which is suspended in a vacuum to guarantee there are no vibrations."

Suspending in a vacuum sounds like a contradiction in terms. A vacuum
tends to draw things in. At some point the turntable has to be riding
on some kind of bearing - i.e. something solid has to be contacting
something solid - which AFAIK provides a potential conduit for
vibration transmission. From a theoretical standpoint, how would you
"suspend" something like this in a vacuum in a way that guarantees no
vibration?


It is magnetically suspended. The vacuum will prevent air currents from
moving the plinth around. However, the vacuum will also change the
damping
of the cartridge somewhat, and I am not sure what it will do to the
record/stylus interface.

And of course a vacuum requires a seal, which sounds like something
with the potential to fail.


Yes, of course. Machinery is like that.
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but if the magnets vibrate would not the change in flux vector cause a
vibration in the suspended object
George