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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.
>
> http://www.rbannis.com/products/magnets.html
>
> 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.
>>
>> Regards,
>>
>> John Schroth
>>
>
>