In search of...25AP22 DUD, for it's safety glass. - Videokarma.org TV - Video

farmradio · #1 07-02-2013, 07:54 AM

Hi, all. Came across a set that is in need of a safety glass for the 25AP22. Any help is appreciated, I recycled all my dud tubes, without keeping at least one spare safety glass. Thank you. P.S. Posted in here by mistake, It's rectangular as you may know. 1967...

You know, the minute you toss something, a need shows up for it.
PM me if you may have something to offer.

Electronic M · #2 07-02-2013, 04:03 PM

I have one of those CRTs that is dying on a brightener. If I had a good replacement for that CRT I'd offer you the safety glass.

julianburke · #3 07-04-2013, 01:36 PM

If you pressure band it, you won't need a bonded face.

farmradio · #4 07-26-2013, 07:18 AM

Thank you, all. Seems it was not cracked at all. Optical illusion from the PVA material.

DaveWM · #5 07-26-2013, 07:45 AM

Quote:

Originally Posted by julianburke

If you pressure band it, you won't need a bonded face.

do you have details on how this is done? I recently had a 25AP22 implode while removing a safety lens. I would like to band it BEFORE removing the glass for implosion protection but I have no idea about the type of band, where you get it, the tool to install it. They look like simple metal strapping, but again I do not know the details.

dieseljeep · #6 07-26-2013, 08:36 AM

Quote:

Originally Posted by DaveWM

do you have details on how this is done? I recently had a 25AP22 implode while removing a safety lens. I would like to band it BEFORE removing the glass for implosion protection but I have no idea about the type of band, where you get it, the tool to install it. They look like simple metal strapping, but again I do not know the details.

Use the original mounting band, that came with the set.
If you look at the mounting band used on the newer CRT's, you'll see it's either crimped or spot-welded. Also the larger ones have some kind of an epoxy cement as well.

DaveWM · #7 07-26-2013, 09:11 AM

Quote:

Originally Posted by dieseljeep

Use the original mounting band, that came with the set.
If you look at the mounting band used on the newer CRT's, you'll see it's either crimped or spot-welded. Also the larger ones have some kind of an epoxy cement as well.

I had assumed the safety band for implosion protection was tensioned much more than just the mount band of a boned face set?

If my assumption is incorrect, then next time I remove a lens I will just leave the mount hardware attached during the removal process (couldn't hurt anyway).

mstaton · #8 07-26-2013, 09:14 AM

A 23V safety glass will work for that CRT

andy · #9 07-26-2013, 09:46 AM

...

DaveWM · #10 07-26-2013, 10:23 AM

Quote:

Originally Posted by andy

It is under a lot more tension than a mounting band. I cut one once (after letting the tube go to air). I didn't have to cut all the way through the band before the tension broke it, and it really flew off with a surprising amount of force. I've heard that cutting a band on a life tube will cause it to implode, but I haven't tried it.

Ok then back to the orig question how to correctly apply a tension band. Maybe someone that knows how to contact Scotty could fine out?

I know I would feel a lot more comfortable with a tension band on a bonded face CRT (when removing the lens that is), esp after my latest attempt, it sounded like a IED going off in the back yard, I was lucky, only got a minor cut on my arm, there where some pretty big chunks of glass several feet from the implosion.

DaveWM · #11 07-26-2013, 10:30 AM

http://www.youtube.com/watch?v=lRJ0otqgmYs

here is the lost CRT too bad it tested great.

old_tv_nut · #12 07-26-2013, 12:53 PM

I don't think it's safe to try putting a tension band on a tube not designed for it. It may do nothing useful, or if you really can achieve full tension, it may stress the tube excessively at some points where it wasn't designed to take it.

DaveWM · #13 07-26-2013, 01:05 PM

Quote:

Originally Posted by old_tv_nut

I don't think it's safe to try putting a tension band on a tube not designed for it. It may do nothing useful, or if you really can achieve full tension, it may stress the tube excessively at some points where it wasn't designed to take it.

I don't know this for a fact, but seem to recall "somewhere" that hawkeye used to add the bands to previously bonded screen CRT's when rebuilding (and not rebond the lens).

Again I can not be sure. This would be a great question for Scotty.

DaveWM · #14 07-26-2013, 01:18 PM

oh well I forgot all this

http://www.videokarma.org/showthread.php?t=249487

now just have to go thru it again and see if we got a 'scotty" response.

a lot of it talks about roundie color tubes though, which I think its safe to say do NOT need a band (I don't thin I have ever seen a banded roundie). However I was not able to find much talk about rectangle color tubes.

rcaman · #15 07-26-2013, 03:31 PM

Quote:

Originally Posted by andy

It is under a lot more tension than a mounting band. I cut one once (after letting the tube go to air). I didn't have to cut all the way through the band before the tension broke it, and it really flew off with a surprising amount of force. I've heard that cutting a band on a life tube will cause it to implode, but I haven't tried it.

you darn tootin it will implode. not any fun cleaning up the mess either. steve