Jay McKnight, founder of Magnetic Reference Labs, and a guy who knows more about magnetic recording
and magnetism than just about anyone else, advises infrequent de-magging of tape heads. His
rationale is that they take a lot of tape passes to get destructively magnetized and there are many
ways to magnetize them improperly using a demagnetizer. I do mine very infrequently, since all other
advice Jay has given me has turned out to be very true.
-- Tom Fine
----- Original Message -----
From: "Justin Lemons" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Friday, November 01, 2013 4:49 PM
Subject: Re: [ARSCLIST] Demagnetizing audio heads
> RB Annis makes a magnetometer that measures the gauss rang of your heads.
> Also, I think if you are putting 6-8 hours a day on your machines,
> demagnetizing them every morning is a good practice. Hope this helps.
> Justin Lemons
> On Fri, Nov 1, 2013 at 2:55 PM, John Schroth <[log in to unmask]>wrote:
>> As standard practice, I usually demagnetize the heads on any tape deck at
>> the start of each morning when I'm doing audiotape digitizing. But it
>> occurred to me that it might be worth asking what others on the list do.
>> How often do you demagnetize your heads if you're putting 6-8 hours on them
>> a day? Do you demagnetize more or less often for different formats (such as
>> cassette verses reel-to-reel)? Is there a measurement device that could
>> tell you if your heads require demagnetization?
>> Any input would be appreciated.
>> John Schroth