[TV] Re: Removing the Coating on the back of a picture tube possible?

[John & Brenda <winturbine@xxxxxxxxxxxx>]

There is a reflective coating on the inside so grinding anything off the 
outside won't work.
I used to keep sections from an old tube showing the gun without the glass and
the shadow mask as it hooked to the front faceplate and a section of the
faceplate with all the color dots on the backside that the electrons strike.

Why don't you put these type items in the case near their respective parts
of the picture tube so the inside details can be seen.  I am sure you can
find plenty of samples.  When breaking an old tube kill the vacuum as
stated in the previous message then you can carefully break the shell
while keeping the desired items intact.  The hardest piece to bread is
the faceplate to get a small section.  It is very thick and hard to break.
A corner piece is the best place to get a piece of the shadow mask as
that is where it is fastened.  If you have access to a diamond saw
you can cut out the pieces rather than depend on them breaking in
the right place.
Good project.
John



At 04:43 PM 4/3/2005, you wrote:
>Hello,
>Do you plan on having it operational?
>If so it should degrade picture quality depending on how much you remove.
>The coating acts as a capacitor plate stablizing high voltage.
>Also most of both sides are coated.
>I just broke one 32 inch to toss it away.
>I was not looking for what you wanted to know and it would be hard to tell
>from all the little pieces.
>A black and white tube may have less coatings but no mask too.
>The coating does scrape off but don't cause it to implode by scratching
>glass.
>If not operating break the little tip where they evacuate it to let the air
>in to make safer.
>You may concider getting literature from the manufacturers showing cross
>section of tube for promotional purposes.
>Good luck and be carefull the glass can fly 20 feet or so if you break one.
>Cy
>----- Original Message -----
>From: "Dave" <inssomniak@xxxxxxxxxxxxxxxxx>
>To: <tv@xxxxxxxxxxxxxxx>
>Sent: Sunday, April 03, 2005 6:04 PM
>Subject: [TV] Removing the Coating on the back of a picture tube possible?
>
>
> >
> > I was requested to build a small TV set into a plexiglass cabinet, from
> > a 5 inch or so color TV set, demonstrating the workings of a TV for a
> > classroom setting.
> >
> > Is it possible to sand off/grind off the rear black coating on a picture
> > tube to then see inside of the Tube? to see the shadowmask?
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