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BradTheAggie
Joined: 08 Mar 2006 Posts: 651 Location: Oak Point, Texas
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| Posted: Fri May 28, 2010 10:18 pm Post subject: Question on tube wear |
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I finally got the XG75 ready to ship to the guy I was helping out in California. I pulled the neck cards and boxed them separately, then pulled the lenses and took pics. The red and blue look perfect. The green shows between a 7 and an 8 (closer to an 8) condition, with the classic small wear pattern in the center of the tube, characteristic of an improperly set up NEC projector. How visible will this be? I'll post pics of the green tonight...
Brad
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CZ Eddie
Joined: 23 Mar 2006 Posts: 1601 Location: Austin, TX
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| Posted: Fri May 28, 2010 10:55 pm Post subject: |
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On a solid green field, you will notice the wear pattern if you set the raster larger than the pattern.
But watching movies, you will rarely ever notice it. Except maybe once in awhile when the video shows a sky view or something very very bright, like white, without lots of other things to break up the image.
You will probably need to raise green drive a bit and maybe lower red & blue drive, to ensure an all white field does not have a slight pink tinge to it. This and proper grayscale will make it worthy.
_________________ Back after a digital sabatical.
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ecrabb Forum Moderator
Joined: 13 Mar 2006 Posts: 15909 Location: Utah
TV/Projector: JVC RS40, Epson 5010
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| Posted: Fri May 28, 2010 11:27 pm Post subject: |
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Depends how much of a stickler a guy is whether it will be bothersome. Some guys would hardly notice while it would driver others batty. I'm one of the latter.
Where you'll really notice it is like Eddie said, skies, snowy scenes... Anything where the APL is fairly high, and the background is pretty consistent... On a sky for instance, there will be a noticeable (and obnoxious to some) brighter greenish "frame" around the outside of the picture.
SC
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cmjohnson
Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s
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| Posted: Sat May 29, 2010 12:35 am Post subject: |
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Any wear you can see on the tube face will be visible on the screen provided it's within the raster area to be used.
How much? Just as noticeable on the screen as when you look at the tube face, exactly. Wear that's so faint you have a hard time
seeing it on the CRT face will be hard to see on the screen. Obvious wear will be obvious. Severe, severe.
CJ
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CZ Eddie
Joined: 23 Mar 2006 Posts: 1601 Location: Austin, TX
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| Posted: Sat May 29, 2010 12:40 am Post subject: |
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| cmjohnson wrote: | Any wear you can see on the tube face will be visible on the screen provided it's within the raster area to be used.
How much? Just as noticeable on the screen as when you look at the tube face, exactly. Wear that's so faint you have a hard time
seeing it on the CRT face will be hard to see on the screen. Obvious wear will be obvious. Severe, severe.
CJ |
I wouldn't go that far, exactly. Blue & Red are making up what is on the screen also. Green is only about 50-60% of the picture? So if you're watching 24, you would maybe notice it for a few seconds out of the entire hour long show.
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cmjohnson
Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s
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| Posted: Sat May 29, 2010 1:04 am Post subject: |
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It's fair to note that wear on green is MOST noticeable. It takes more wear on red and blue (especially blue) to be noticeable.
But green...what you see is what you WILL see.
CJ
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BradTheAggie
Joined: 08 Mar 2006 Posts: 651 Location: Oak Point, Texas
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| Posted: Sat May 29, 2010 1:06 am Post subject: |
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Here is the green tube:
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cmjohnson
Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s
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| Posted: Sat May 29, 2010 1:40 am Post subject: |
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That's pretty watchable. Whoever's watching that PJ will probably stop noticing it pretty quickly.
CJ
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dturco
Joined: 06 Feb 2009 Posts: 3778 Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Sat May 29, 2010 2:38 am Post subject: |
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That's not bad at all my green is far darker and I barely notice it at all, except in full white sceens like Star Gate Continuum's ice scenes.[img][/img]
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_________________ Firefly rules. Can't stop the signal.
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