[78-L] Turning the tables

[Michael Biel]

I was about to mention the stabilizer brush on your V15 cartridge
because stopping vertical oscillations is exactly what it really is
there for, not cleaning records.  That was a major problem with the I
and II,  and I remember when they added it, I think to the III. The
bouncing is seen on other long cantilever cartridges, and is more of a
problem, ironically, when the arm resonance is brought down to the very
very low frequency range, but also when too good a cartridge is put in
an ordinary arm.  When the I and II were introduced, not too many people
had the really good arms these are designed for.    

Mike Biel  mbiel at mbiel.com




-------- Original Message --------
Subject: [78-L] Turning the tables
From: DAVID BURNHAM <burnhamd at rogers.com>
Date: Mon, January 04, 2010 2:46 pm
To: 78-L at 78online.com

M. Biel wrote:

Yes this is a good point.  I certainly agree that rising and falling of
the record surface can set up bouncing and resonance of the tone arm and
cartridge, and this can be caused by a warped record (naturally or with
pennies underneath) as well as a tilted table. 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Thank you for the compliment but I'm not quite sure what the "good
point" was.  What I was trying to say was that putting the pennies under
the otherwise flat record to simulate an unlevel turntable did not
affect the sound at all.  Certainly a record with a small warp on the
edge, (a common affliction on LPs), can set up oscillations in the tone
arm as you describe, but when the period of rise and fall is ca. 2
seconds, there doesn't seem to be any such oscillation.  Perhaps the
situation is helped by the stabilizer brush on the V15 cartridges..

db