How often do you demagnitize your MC cartridge?

"A little knowledge is some times quite dangerous" so says the old adage. “Fellas”, we are taking about traces of residual magnetization in the coils. So called “pure Copper” coils may have traces of iron or other magnetic materials. After prolonged usage the trace molecules will align themselves into magnetic domains. The net effect is a perturbation of the magnetic field intensity created by the fixed magnets at the position of the coil (the resulting field is the vector sum of the field from the magnetic dipoles in the coil and the field from the fixed magnet). Demagnetization attempts to make the orientation of the dipoles random thus rendering the coil un-magnetized (the sum of the B field is zero, because the random orientation of the magnetic dipoles leads to cancellation.)

I agree that frequent demagnetization may be detrimental to the cartridge. However, I feel strongly, that many cartridges benefit from periodic demagnetization.

I'd say six nines is pretty pure copper.

a-little is enough to wage the gradient of random propagation of so-called residual magnetization and compare its effect to a global demagnitization of the whole cartridge along with permanent magnets. also there's always either 0+ or 0- and it cannot be always clear and pure zero.

It's the chicken that does it.

After reviewing the progress of this thread it's obvious that alien abductions must be on the increase, perhaps it correlates to a lousy economy, and so the great need for demagnetizing cartridges.