Quote:
Originally Posted by Radio Wrangler
THere is a snag to mumetal on CRTs... it can get permanently magnetised, just from getting a knock and being in the Earth's magnetic field, od from being worked. So you need to thermally anneal them after manufacture before they can be used.
David
|
I noticed on the Mu metal CRT shields for the VCR97 CRT that they can acquire a permanent magnetic field. It was easy to see the beam deflection when the two halves are assembled around the neck, with the CRT running. So I simply used a degaussing wand on it (well away from the CRT of course). That appeared to solve the problem, but I guess I could have heated it too.