cartridge demagnetization


Are there any telltale signs that your phono cartridge [especially MC] needs to be demagnetized, or is this just a preventative maintenance issue?
boofer
In that YouTube video, it really isn't a demag, it's a deflux. Not the same thing, but I'm sure it won't harm anything and could be worth a try.

If it was a real demag, the MM cartridges he claims also benefit from this treatment, would be ruined.
Miyajima MC transformer has buid in demag. option.
I've seen Luxman Demags on ebay very often
I use the demagnetizing cuts (side 2, tracks 2 & 3: pink noise) on Analogue Productions Ultimate Test LP. Was skeptical at first, but the results were unambiguous on my Koetsu.