Just bought a used sumiko fluxbuster and demagnetized my Lyra Etna for the first time. Pretty nice improvements in sound! How often should cartridges be demagnetized?
NEVER demagnetize anything which already has a magnet inside it for its normal operation. Otherwise you will destroy/weaken the magnet. This includes moving coil, moving magnet cartridges and speakers as well as your credit cards :)
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