piclist 2001\02\24\102255a >
Thread: VHS tape, a way to erase it.
face BY : David VanHorn email (remove spam text)

>My magnetic theory is sketchy, but surely ANY ac magnetic
>field will demag things, if given enough time? I'm always
>having to demag TVs that were magnetised by the earth's
>magnetic field over ten+ years. Surely it's a field/time
>thing?? Curious.

No. You have to get above the threshold, or nothing happens.

I need to brush up on the terminology, but that's the basics.
Tape has a min flux value. There's some microscopic variation around that
number, but for lo-coercivity tape at 300 gauss, a field of 250 is totally

Dave's Engineering Page: http://www.dvanhorn.org
Where's dave? http://www.findu.com/cgi-bin/find.cgi?kc6ete-9

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Subject (change) VHS tape, a way to erase it.

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