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Post by ChrisB on Aug 3, 2016 6:35:16 GMT
A phono cartridge is totally reliant on the use of magnets to work. What's being demagnetised with a demagnetiser and why doesn't it make the cartridge worse rather than better?
What's going on then?
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Post by daytona600 on Aug 3, 2016 7:49:05 GMT
They do give a small lift in performance & some phono stages have them built in
never use them with MM Cartridges
Remember that a moving coil phono cartridge is basically a coil of wire wound around a piece of iron (or ferrous material) suspended within a magnetic field. This electrical generator is activated by the phono stylus in the record groove, moving the wire coil and thus generating a signal to be amplified and reproduced by your loudspeakers. Think back to a simple science experiment placing a pin against a strong magnet for a few minutes. Afterwards, the pin, which is made of ferrous material, becomes magnetized enough to attract another pin.
Today's best moving coil phono cartridges use very strong magnets such as neodymium and samarium cobalt. When the moving coil absorbs some of the magnet's charge, the sound becomes murky and less defined. This is because the magnetized coil does not generate as great a variation as it moves within the magnetic field of the phono cartridge.
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Post by MartinT on Aug 3, 2016 8:45:48 GMT
My Aurorasound VIDA phone stage can demagnetise the coils and it does improve the sound.
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Post by daytona600 on Aug 3, 2016 8:58:41 GMT
Used a Vida myself & agree martin now use a external demag unit with my Lamm phono stage
also Demag my records ! another can of worms
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Post by ChrisB on Aug 3, 2016 13:26:29 GMT
OK, so it's electrically connected to the coils via the cartridge pins. This is rather different then, to a 'magic wand-like' device that one might use to demagnetise the heads on a r:r tape deck - where everything within reach is affected and God help you if you left something nearby that you don't want demagnetising.
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Post by MartinT on Aug 3, 2016 15:00:37 GMT
Agreed, different mechanism.
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