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Old 29th August 2004, 02:48 PM   #21
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hi ,,,An old book with title: "The recording and reproduction of sound" by Oliver Read ,Editor, Radio and Television News and radio electronic Engineering ,1952 Indiana USA, wrote about this phenomenon: Magnetization of tubes. " Glass tubes of a given type show more individual variation in hum level than metal tubes The British journal WIRELESS WORLD has reported that this phenomenon is associated with permanent magnetization of the tube elements, which seems to increase the hum level in a way not yet understood. The remedy is demagnetization with a gradually removed 50-60 cycle field, the same as jewelers do with watches.The winding of an old power transformer, removedfrom the core, can be used for a demagnetizing coil.Connect the secondary across the 115 volt line{ using series resistance if necessary, to keep it from gettingtoo hot} insert the tube, then slowly withdraw it.'' THANKS
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Old 29th August 2004, 09:02 PM   #22
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Default PRIDE AND PREJUDICE...

Hi,

Quote:
Because Frank, that`s the only thing i did to create a sound change in the system, and it was because of the demagnetiser that the change happened, please unless you`ve tried it, do`nt comment, unless you can come up with a plausable believable answer, have an open mind until someone can close it with proven fact.
Did I say I've never tried it? Don't think so.
However, by just pulling the tubes in and out if their sockets you can already hear a difference unless the pins are treated with a contact enhancer...perhaps?

See, I don't have to pull out tubes and start looking for a magnet, being notoriously lazy, I just run that CD and, voila...The system is now demagnetized...including the tubes.

Psssstttt....Did you know that even CDs themselves benefit from the occasional demagnetization?

BTW, the cause of the problem is often paramagnetic remanance, not magnetism per se.

Happy now?
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Old 29th August 2004, 10:26 PM   #23
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Default Riiiiiiiiight.

Then in that case, please tell me the difference between whatever they have on the CD, and the random nature of music, or even the regular rythm of a sine wave? (Heck, even a DC offset is averaged to zero in a typical AC-coupled amplifer. 2Hz squarewaves make interesting viewing if you have an LF instability!)

Tim
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Old 29th August 2004, 10:42 PM   #24
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Hi,

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Then in that case, please tell me the difference between whatever they have on the CD, and the random nature of music, or even the regular rythm of a sine wave?
Quote:
I think I'm the only person on this forum who has a workable theory to why everything does what it does and doesn't.
Asking for an explanation on how demagnetisers work now, are we?

Riiiiiiiight.

O.K...So you didn't even bother to check this forum for info? It's here alright and...I said I was a lazy kinda guy already but at least I do my own homework so.....

Cheers,
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Old 29th August 2004, 11:15 PM   #25
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Quote:
However, by just pulling the tubes in and out if their sockets you can already hear a difference unless the pins are treated with a contact enhancer...perhaps?
Quote:
Did I say I've never tried it? Don't think so.
Frank my pins and sockets are keep clean as a whistle, with cleaner/enhancer using small dental brushes, so it`s definatly not that what i`m hearing.
Try again.
You still have`nt said you`ve tried it, just stated that you have`nt stated you have`nt.
( wow! that was a voodoo sentence)

Cheers George
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Old 29th August 2004, 11:38 PM   #26
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Hi,

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You still have`nt said you`ve tried it, just stated that you have`nt stated you have`nt.
Allright already...
I have tried demagnetizing electron tubes a long time ago when a friend engineer and yours truly were playing with the idea of using tubes as a volumecontrol. We did use the rather crude method of a magnet for that and it worked.

Now...Where do I sign?

Cheers,
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Old 30th August 2004, 12:13 AM   #27
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Quote:
Originally posted by fdegrove

Asking for an explanation on how demagnetisers work now, are we?

Riiiiiiiight.
Ok, so since you have no explanation, then you have no theory of operation... and obviously... no scientific reasoning. In other words... it doesn't work. Thank you.

Tim
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Old 30th August 2004, 12:50 AM   #28
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Default MR. OBNOXIOUS REACHING CURIE POINT?

Hi,

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In other words... it doesn't work. Thank you.
Do you always come to conclusions this way?

What doesn't work and what part is it you don't understand?

I already said you can find out how demagnetisation works both in threads here on the forum and elsewhere.
So what is it you want ME to prove that's already been proven by others?

Cheers,
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Old 30th August 2004, 07:35 AM   #29
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I want to hear your explanation.

I have bad luck at digging for threads anyway...

Tim
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Old 30th August 2004, 11:22 PM   #30
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Default SEARCH ENGINE PICKY ON USERS?

Hi,

Quote:
I want to hear your explanation.
I want a million green ones too....

Quote:
I have bad luck at digging for threads anyway...
Seems I have better karma...

LOCAL SEARCH

MC CARTRIDGE DEMAG

PHOTONS FOR YOU....

If, after carefully reading all this material you still don't see how putting a file on a CD and playing it back replaces half of the ancilliaries normally needed, I'll just throw in the magnet errr....towel.

Enjoy,
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