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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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stefuel
Joined: 07 Mar 2006
Posts: 3353
Location: Green Harbor MA USA
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| Posted: Fri May 15, 2009 8:59 pm Post subject: |
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I would put up a crosshatch test pattern and look at the tube face through the c-element moving your head around to see if the round blob moves or the test pattern looks fuzzy. Most likely I'm wrong but that looks like fungus to me. 
_________________
Chip
A Barco is only a AmPro with training wheels
Card carrying member of the AVS chain gang.
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dochlywd
Joined: 25 Apr 2006
Posts: 346
Location: Saint Louis, Missouri
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| Posted: Fri May 15, 2009 9:34 pm Post subject: |
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It would also help to use the <cutoff> and find out what color makes it disappear. I have two nice sets of 1292 tubes minus the green C-elements and focus coils that I'm getting ready to list.
Doc
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Fri May 15, 2009 11:46 pm Post subject: |
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Phosphur Delam.
Phosphur Delam.
Phosphur Delam.
Phosphur Delam.
Cha cha cha.
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Bert Randolph
Joined: 03 Jul 2007
Posts: 81
Location: Germany
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| Posted: Sat May 16, 2009 10:31 am Post subject: |
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Thanks for all the suggestions. As I dont have the machine near to me I cannot try out most of them.
Anyway, the price has gone up way to high for my taste, therfore for me that story is over...
Mark,
what does 'Delam' mean?
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Sat May 16, 2009 10:39 am Post subject: |
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Delam = delamination.
The phosphur is pealing off the inside of the tube face.
It's an unfortunately common issue with 1292s. Not every 1292 does it, but enough for me to know about it.
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Bert Randolph
Joined: 03 Jul 2007
Posts: 81
Location: Germany
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| Posted: Sat May 16, 2009 11:55 am Post subject: |
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| Mark_A_W wrote: | Delam = delamination.
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I could have thought about that 
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skippyar
Joined: 22 May 2009
Posts: 108
Location: Bristol, UK
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| Posted: Fri May 29, 2009 1:40 am Post subject: |
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| Bert Randolph wrote: | Hmm, too bad.
This seems to be a very strange wear pattern to me. I wonder what was projected to cause such a pattern. Especially since, according to the seller, there are only 900 hours on the tubes.
Are green tubes for the 1292 hard to find?
So long,
Daniel |
I have a similiar type of defect on my CRT. The last 10-12 inches of the entire horizontal width has a completely different tone to the rest of the image.
I can't see anything on the actual green tube itself, however, it does pertain to the green tube as I've cycled through covering over the lens.
Here are a couple of photos I've taken:
http://www.flickr.com/photos/skipster/sets/72157618808224845/ (The set)
http://www.flickr.com/photos/skipster/3574133387/in/set-72157618808224845/ (The graduation of tint)
http://www.flickr.com/photos/skipster/3574133399/in/set-72157618808224845/ (Close up of horizontal banner)
I can only assume this is some type of phosphor wear, though I'm relatively new to CRTs so I welcome any thoughts.
Thanks for your time.
Paul.
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Mark_A_W
Joined: 15 Mar 2006
Posts: 3068
Location: Sunny Melbourne Australia
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| Posted: Fri May 29, 2009 2:24 am Post subject: |
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I think that's good old fashioned wear Paul.
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skippyar
Joined: 22 May 2009
Posts: 108
Location: Bristol, UK
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| Posted: Fri May 29, 2009 2:37 am Post subject: |
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| Mark_A_W wrote: | | I think that's good old fashioned wear Paul. |
Thanks for the prompt response Mark.
I can appreciate that, as most of my setup is from the same era, I've become used to and accepted.
I have to say it is a remarkable and impressive unit.
Cheers.
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