No, just my general understanding. I thought it was only 78s which had fillers? Record vinyl has plasticisers, which are softer than the vinyl itself? It is the softness of the vinyl which is part of the problem, as dust particles can get stuck into the groove walls and normal brushing may not dislodge them.
quote-- from audioimport.nl
The stylus bears on the groove wall with a pressure of from 40,000 to 70,000 pounds per square inch. The stylus is "Flying" along the length of the groove at 20 inches per second. The force on the groove wall is so great that there is an enormous pressure wave moving out into the body of the plastic as the record moves around the stylus tip. The groove wall is pushing and shoving the stylus tip around. The force needed by the wall to accelerate and move the stylus is added to the already huge pressure exerted by the stylus at rest. The combination of forces creates a varying amplitude pressure wave that under critical conditions becomes a shock wave that hammers its way through the vinyl material. The energy in such a shock wave can exceed the bonding forces which link and hold the vinyl together.
No, generally it's carbon black- that doesn't have the lubricity of graphite, but it does a better job of coloring and modifying the mechanical properties of the vinyl. Generally a low structure factor black.
The fact that there are a tiny proportion of CNTs contained in blacks will no doubt start speculation on mysterious factors affecting the sound quality of vinyl...
The fact that there are a tiny proportion of CNTs contained in blacks will no doubt start speculation on mysterious factors affecting the sound quality of vinyl...
, the level of plasticizers in LP compounts is quite low. And they aren't just PVC, there's PVA in there as well.
Precisely. The content of CNTs and buckyballs affects the electron tunneling properties, causing variable percolation thresholds. This explains the increased smoothness and freedom from digitization nasties that will always separate fine vinyl from digital media for the truly sensitive music lover.
Over time, a lot of crap can build up on the inside of the cartridge motor which can cause the problem you are hearing. Can you remove the stylus and make sure that it is absolutely clean inside? This sounds like a tracking problem, and since this is a Shure MM, there is either something physically hampering the mechanism or the cartridge set-up is in gross error.
John
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is it possible to open up the cartridge and clean it out? can i use some deoxit type spray to clean it?
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