Hej

Er der nogen her i forumet der har prøvet at afmagnetisere/demagnetisere deres PU, og hvorledes var resultatet heraf.

Jeg har nemlig selv overvejet at få min PU demagnetiseret, da jeg syntes at diskanten er begyndt at blive en smule hvislende (Ssss lyde) fra pladespilleren, men er i tvivl om hvilket produkt/metode jeg skal vælge.

mvh Gorm

Her er hvad Van Den Hul skriver om at afmagnetisere. Teksten er kopieret fra hans FAQ:

http://www.vandenhul.com/artpap/phono_faq.htm

20 Q: Can I improve the sound by so-called “demagnetization” of my phono cartridge ?

A: NEVER demagnetize a M.M. cartridge with the replaceable stylus still inserted. It will ruin the mini-magnet at the end of the cantilever in its magnetic power. With the stylus insert removed you can consider it, but first read the rest of this answer:
From a more theoretical point of view, I think it is not wise to demagnetize. It is a short term effect with more negative side effects on the long-term. Your first experience will be very positive as also was mine. But after 2 record sides you have to do this again and it never stops. So you have become a serious victim. And keep in mind: the original cartridge magnet already puts the tiny armature in such a strong magnetic field that its magnetization is unavoidable, so why should you demagnetize? Also, since the magnet never is perfectly at center position but always has some offset, the mu-metal made centre of the coil system always holds residual magnetism and can’t become demagnetized. And if this is not enough: The current through the 20 micron thin coil wire is so small that there is no chance to build up any serious magnetic field to cancel the existing residual magnetism. What it only does is breaking down the magnetic domain boundaries in the mu-metal. This improves the magnetic resolution of the music. But after a short while these boundaries will be there again and the number of atoms per magnetic domain has only got bigger. So the magnetic resolution is worsening instead of getting better. So from the point of view: “I bought the thing and now I will use it”, you have to use it. The only advantage is that some crystal boundaries inside the coil wires are welded. But as soon as you move the armature by playing your records that effect is over again. So save the money and buy some good records.

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I like techno - UNPLUGGED!

Der er altid delte meninger om alle tweeks i denne branche.

Jeg sælger Aethetix demagnitizer, så jeg er ukvalifiseret, men vil gerne fortælle om egen erfaring med min gamle Lyra Clavis PU, som også havde de SSSSS'er på visse passager, at jeg overvejede at retippe den. Efter en tur i demagnitizeren, eller et par gange faktisk, var den til at høre på igen, så retipning er ude i fremtiden.

NU skal man ikke undervurdere Van den Hul, men han leverer jo af at retippe PU's, så demagnitizers er ikke hans kop te. I princippet vil jeg da også sælge dig en retipning, som vel koster 2-4 k kr., afhængig af hvor omfattende retipningen skal være.