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Refugee · 19th Feb 2021, 1:50 am

Most decent tape recorders including cassette ones have a bias oscillator with a decoupling capacitor that should be of sufficient size that a reducing AC signal should exist on the head every time record is disengaged. Provided the head shield/casing is non magnetic there is unlikely to be a need to do anything apart from engaging record on the lead out of a tape or on a blank tape every so often.
Players are another matter and DC bias units are not worth the bother.

19th Feb 2021, 1:50 am	#6
Refugee Dekatron Join Date: Apr 2012 Location: Worksop, Nottinghamshire, UK. Posts: 5,554	Re: Head demagnetizer cassette Most decent tape recorders including cassette ones have a bias oscillator with a decoupling capacitor that should be of sufficient size that a reducing AC signal should exist on the head every time record is disengaged. Provided the head shield/casing is non magnetic there is unlikely to be a need to do anything apart from engaging record on the lead out of a tape or on a blank tape every so often. Players are another matter and DC bias units are not worth the bother.