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Thread: VHS tape, a way to erase it.
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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.
>-Roman


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
harmless.


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