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In Reply to: RE: Degaussing vinyl: Anyone make a wire loop type of homemade degausser for thier Lps? posted by Elizabeth on April 26, 2012 at 04:38:58
Back in my college day a bunch of us thought about making our own degassing coils.
The bulk wire and associated parts cost more than just buying a degassing coil.
You can still get one for about $40 at Fry's
I don't want to know why you think vinyl can be magnetized.
for anyone who wants to know how spinning vinyl can lead to magnetization issues, here is something from the degaussing thread on the vinyl forum:
"We have a medium very much prone to static build-up. Thus charged, we spin this medium at up to 500RPM for CD and a bit slower for vinyl. From Rowland’s experiments we learn that such activity creates its own magnetic field. With magnetisable particles embedded in the CD structure, label print ink and colorants to make basically clear vinyl look black, we have permanent magnets on our hands. For LPs, the magnetic field of the spinning disk is in very close proximity to the sensitive structure of the cartridge and thus influences the pickup."
so the problem is that records can get a static charge, when the charged record spins it creates a magnetic field, and the magnetic field can be picked up by the cartridge.
"we spin this medium at up to 500RPM for CD and a bit slower for vinyl.
33.33 RPM is quite a bit slower than 500 RPM. Good reason to be suspicious of the entire argument, IMO.
"Diversity is the law of nature; no two entities in this universe are uniform." - P.R. Sarkar
It's not the RPMs per sec it's the angular velocity. The angular velocity of the outer rim of the LP is relatively high and the surface area of the LP is considerably greater than a CD, about 4 times greater. And we don't known the minimum velocity required to produce the effect.
But one has to wonder, ESP. In the case of the CD, even if it is degaussed prior to play, why doesn't the magnetic field reemerge after say 5000 revolutions?
The angular velocity is constant; the linear velocity varies linearly with radius at a fixed rotational speed.
personally i am not as interested in figuring out why it works as i am in IF it works. if the process works as its proponents claim, then its probably worth doing. imho.
TV CRT degaussing coils are dirt cheap these days as they are totally unnecessary with flat screens. Seen them as cheap as $10....
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