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