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From: frankb@hpsad.HP.COM (Frank Ball)
Newsgroups: sci.electronics
Subject: Re: TV Picture Tubes and Speaker Magnets
Message-ID: <1840050@hpsad.HP.COM>
Date: 18 Jun 91 21:44:37 GMT
References: <1991Jun12.192427.18120@syssoft.com>
Organization: HP Signal Analysis Division - Rohnert Park, CA
Lines: 12

/ mcovingt@athena.cs.uga.edu (Michael A. Covington) / 10:20 am  Jun 16, 1991 /
*The usual magnetic shielding material is mu-metal. The cheapest way to
*get some is to go to a hamfest (flea market) and buy a couple of dead
*oscilloscopes that have mu-metal shields around their CRTs. But I'm told
*that mu-metal is brittle and you can't just unbend it. 

You can unbend it, but its magnetic properties deteriorate significantly.  
There is an annealling process to restore it, but its not something you can
do at home.  Try using ordinary sheet steel.


Frank Ball   frankb@hpsad.HP.COM   pyramid!hplabs!hpsad!frankb