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From: ark@rabbit.UUCP (Andrew Koenig)
Newsgroups: net.audio
Subject: Re: Cassette Deck Head Demagnetisers
Message-ID: <2813@rabbit.UUCP>
Date: Tue, 22-May-84 14:36:30 EDT
Article-I.D.: rabbit.2813
Posted: Tue May 22 14:36:30 1984
Date-Received: Wed, 23-May-84 19:23:19 EDT
References: <113@pertec.UUCP>
Organization: AT&T Bell Laboratories, Murray Hill
Lines: 22

I can think of only three rules to follow when using an AC demagnetizer:

	1. Turn the power off on the tape deck (and preferably
	on the rest of your system too) before turning on the
	demagnetizer.

	2. Do not allow any metal part of the demagnetizer to
	touch any part of the tape deck.  Demagnetizers whose
	'business end' is covered with plastic are to be preferred
	for that reason.

	3. Do not turn the demagnetizer on or off unless it is at least
	three feet from any part of the deck.  Do not bring it within
	three feet of any tape while it is turned on.

The consequence of rule (3) is that you turn the thing on, bring it over
to the deck while it is on, wave it around the heads and guides while
it is still on, bring it away from the deck while it is STILL on, and
only THEN do you turn it off.

If you switch the thing off while it is too close to your heads, you'll
wind up with them magnetized worse than before you started.