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Message from discussion New GS owner questions
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Michael Black  
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 More options Mar 17 2012, 11:34 am
Newsgroups: comp.sys.apple2
From: Michael Black <et...@ncf.ca>
Date: Sat, 17 Mar 2012 11:34:48 -0400
Local: Sat, Mar 17 2012 11:34 am
Subject: Re: New GS owner questions
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On Fri, 16 Mar 2012, Michael J. Mahon wrote:
> D Finnigan <dog_...@macgui.com> wrote:
>> Wholly Mindless wrote:

>>> The good news is that the THUNK is what they all do - apparently this the
>>> automatic degaussing feature that many crts had.

>> I had assumed that it was just the sound of high tension entering the CRT.

>> I may be mistaken, but I don't believe that the AppleColor RGB has a
>> degausser.

>> I once was party to quite the shenanigan involving my GS monitor: I had been
>> fooling about with a rare-earth metal magnet (liberated from a 1992-era
>> Quantum hard disk drive), pulling the electron gun until rather a nasty
>> blotch took up residence on the screen. Well of course it had no intentions
>> of leaving!

>> The solution I devised was to lift the GS monitor and hold its screen flat
>> against the screen of my Mac mini's 17" CRT. I powered on the larger
>> monitor, whose automatic degausser was only too happy to assist with the GS
>> monitor as well.

>> An amusing solution, I'm sure.

> I think almost all color monitors (and TVs) came with degaussers--a
> practical necessity on a planet with a magnetic field. ;-)  But the were
> never intended to deal with strongly magnetized shadow masks, which is what
> you get if you get close with a rare earth magnet.

That's my impression too.  Very early color tv sets didn't, you certainly
would see lots of reference to external degaussing coils back then.

But then they disappeared, and it does seem like after a certain point
(and I think predating the rise of home computer monitors) they did all
have degaussing coils built in. Of course, perhaps they burn out. They
have something to make sure they come on when the set is just turned on,
and then off after enough time to degauss, and I think the whatever means
that if you turn off the monitor/tv and then turn it immediately back on,
there's no degaussing.  Given that, the whatever could break down at some
point, no automatic degaussing.

    Michael


 
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