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Anthony D

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Since: Jun 23, 2006
Posts: 4



(Msg. 1) Posted: Sun Jul 16, 2006 8:37 pm
Post subject: Question about CRT
Archived from groups: rec>games>video>arcade (more info?)
Greetings everyone,

I have a question about CRT tubes. I suspect someone here would know
the answer, or at least be able to point me in the right direction.

I noticed on all the CRT tubes I've looked at, there is a thick wire
running around the perimeter of the face of the tube. I'm *not*
talking about wire from the anode cap. The wire I'm referring to
starts as two conductors on the monitor pcb, is wrapped in what looks
like electrical tape, and circles the tube. Anyone know what this is,
and what the correct positioning is for this wire?

Thanks,

Anthony

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Neil

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Since: Jun 03, 2006
Posts: 32



(Msg. 2) Posted: Mon Jul 17, 2006 12:55 am
Post subject: Re: Question about CRT [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Anthony D wrote:
> Greetings everyone,
>
> I have a question about CRT tubes. I suspect someone here would know
> the answer, or at least be able to point me in the right direction.
>
> I noticed on all the CRT tubes I've looked at, there is a thick wire
> running around the perimeter of the face of the tube. I'm *not*
> talking about wire from the anode cap. The wire I'm referring to
> starts as two conductors on the monitor pcb, is wrapped in what looks
> like electrical tape, and circles the tube. Anyone know what this is,
> and what the correct positioning is for this wire?
>
> Thanks,
>
> Anthony
>

That is the degaussing coil. It helps stop the monitor frame from being
magnetized. this would produce color distortion on the screen It is
usually tied to the four corner brackets.

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RJ

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Since: Aug 15, 2005
Posts: 152



(Msg. 3) Posted: Mon Jul 17, 2006 1:32 pm
Post subject: Re: Question about CRT [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
On the average I would say about 2 to 3 inches from the edge. The
degause happens as the power is applied to the monitor. It only lasts
for a few seconds. To check and see if the Degause circuit is working,
I use an analog meter and set the voltage setting to
200 VAC you will see a V rise for a second or two. The coil size is
going to dictate how close you can get to the edge. secure the 4
corners with black wire ties. I try and make it even all around.

RJ
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Anthony D

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Since: Jun 23, 2006
Posts: 4



(Msg. 4) Posted: Mon Jul 17, 2006 6:35 pm
Post subject: Re: Question about CRT [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Thanks very much for the info, everyone Smile


RJ wrote:
> On the average I would say about 2 to 3 inches from the edge. The
> degause happens as the power is applied to the monitor. It only lasts
> for a few seconds. To check and see if the Degause circuit is working,
> I use an analog meter and set the voltage setting to
> 200 VAC you will see a V rise for a second or two. The coil size is
> going to dictate how close you can get to the edge. secure the 4
> corners with black wire ties. I try and make it even all around.
>
> RJ
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