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Analog Kid wrote:
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Demagnetiser |
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Analog Kid 
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Joined: 07 Mar 2008 Location: Germany Status: Offline Points: 209 |
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 Topic: DemagnetiserPosted: 16 Dec 2009 at 6:21pm |
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I have a test record from Cardas Audio, "Cardas Frequency Sweep and Burn-In Record", that contains a frequency sweep. It consists of a signal that slowly goes from 30 Hz to 30 KHz, which according to the description on the back cover, "ultrasonically cleans the stylus and degausses the entire system".
I recently purchased a new cassette deck, but I don't have a demagnetising cassette that I can use to demagnetise the tape heads. I was thinking, if I record the frequency sweep from the test record onto a tape, will that frequency sweep then also degauss the heads of the cassette deck? My intuition says it should have that effect on the recording and playback heads of the cassette deck too. If this really works, it would be a clever and easy way of demagnetising the tape heads without using a special demagnetising cassette. And can someone explain the physics behind this: why does a sweeping frequency signal have a degaussing effect on electronic circuitry? Edited by Analog Kid - 16 Dec 2009 at 6:24pm |
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Graham Slee
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Retired Joined: 11 Jan 2008 Location: South Yorkshire Status: Offline Points: 16314 |
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Posted: 16 Dec 2009 at 6:46pm |
It doesn't! (more BS...) |
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That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps
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Analog Kid
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Posted: 16 Dec 2009 at 7:29pm |
 That was not what I was hoping to hear. So the much-hyped frequency sweep on the test record is a deception. I suppose that also answers my first question: if what you say is true, then recording the frequency sweep onto cassette tape, will not have a degaussing effect on the tape heads. :-( But could you perhaps provide a technical explanation of this? Why does the frequency sweep not have the desired degaussing effect? I am wondering why the manufacturer of the test record thinks it does. Edited by Analog Kid - 16 Dec 2009 at 7:50pm |
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Graham Slee
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Posted: 16 Dec 2009 at 9:01pm |
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Can you record a magnet??
Violent vibration can demagnetize a magnet... such as a hammer blow. Playing a record containing frequencies cannot demagnetize a phono catridge. But consider this: a permanent magnet is what's used in a moving coil or moving magnet cartridge - if you were successful in completely demagnetising those, then you'd have a much lower output... or none at all! However, moving iron cartridges may benefit. The only way to demagnetize a cassette tape head is with a cassette which has de-gausing coils in it. By definition this is powered, either by an external power supply or by being rechargeable. I'm not explaining it further. What I can see is that "Simple Simon (who says what people do)" is far more clever than the average customer in this age! It's con trick after con trick after con trick, and so many being taken in - it's shocking! I could sit here explaining everything to you all but what chance have I of reversing the grip the con-man has? And oh, how respectable they come across... butter wouldn't melt in their mouths... And they all seem to be supported by Fan Boys... What is a Fan Boy? Somebody who promotes every new item he gets hold of and sl*gs off the respectable guy who never lies! I have had to delete one such hypocrite off this forum twice within one month... Believe these FAN BOYS at your peril. No offense intened at people called Simon - what you need to know is that Simon Magus (Simon the Magician) started all this rubbish about 2,000 years ago - built a church - then built a great false world on top of it - the world we live in today - not for much longer going on the woes infecting that world right now - and getting worse by the hour. As I've said a number of times over the last 18 months, don't worry, it'll soon be over!  Edited by Graham Slee - 17 Dec 2009 at 9:10am |
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That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps
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Analog Kid
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Joined: 07 Mar 2008 Location: Germany Status: Offline Points: 209 |
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Posted: 17 Dec 2009 at 3:11pm |
That was explanation enough I think, thanks. Take a look at this: http://en.wikipedia.org/wiki/Cassette_demagnetizer "A third design consisted of a cassette shell with a head cleaning tape wound on the spools and a disc shaped magnet mounted above the head cleaner tape such that when the play button was activated the head cleaner physically cleaned the head surface and simultaneously made the magnet rotate, creating the alternating magnetic field required for demagnetizing." I just dug out one of those among my old cassettes. Forgot that I had one. So the question would be: what about that design, with the rotating magnet, is that one effective at de-gaussing the tape heads? My concern is that bringing a magnet close to the heads like that design does, would have the opposite effect, that it might actually magnetize the heads, which is what it says in the instructional manual - that bringing a magnetized screwdriver, magnet or other magnetic object too close to the heads would magnetize them. I am wondering whether the rotating magnet design works as expected. Edited by Analog Kid - 17 Dec 2009 at 3:14pm |
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Graham Slee
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Posted: 17 Dec 2009 at 6:19pm |
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No.
Maxell are pre-bullsh*t era! Just make sure its got a fresh battery so it can do its job. |
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That none should be able to park up and enjoy the view without a smartphone and the knowledge in how to use apps
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