After sorting out a channel dropout on my Nottingham 294 'table and arm w/Dynavector 17D3 cartridge, I got out an old audioquest demagnetizer and used it. Good Grief!! What a difference. I'd been noticing the music seemingly getting blurred, but that got cured big time. The sound is cleaner, crisper and extended. How often should you demagnetize? The cartridge had about 500 hours use.