Return to the CurtPalme.com main site CurtPalme.com Home Theater Forum
A forum with a sense of fun and community for Home Theater enthusiasts!
Products for Sale ] [ FAQ: Hooking it all up ] [ CRT Primer/FAQ ] [ Best/Worst CRT Projectors List ] [ Setup Tips & Manuals ] [ Advanced Procedures ] [ Newsletter ]
 

Blu-ray disc release list and must-have titles. Buy the latest and best Blu-ray titles to show off in your home theater!

 As this forum is rarely used anymore, we've locked it. Feel free to browse and read. Questions? Please reach out to us directly. Cheers! 

Question on tube wear

 
This forum is locked: you cannot post, reply to, or edit topics.   This topic is locked: you cannot edit posts or make replies.    CurtPalme.com Forum Index -> CRT Projectors
Author Message
BradTheAggie



Joined: 08 Mar 2006
Posts: 651
Location: Oak Point, Texas

Posted: Fri May 28, 2010 10:18 pm    Post subject: Question on tube wear

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

_________________
(bholman on the AVS forum)
Back to top
View user's photo album (11 photos)
CZ Eddie



Joined: 23 Mar 2006
Posts: 1601
Location: Austin, TX

Posted: Fri May 28, 2010 10:55 pm    Post subject:

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.
Back to top
View user's photo album (18 photos)
ecrabb
Forum Moderator


Joined: 13 Mar 2006
Posts: 15909
Location: Utah

TV/Projector: JVC RS40, Epson 5010

Posted: Fri May 28, 2010 11:27 pm    Post subject:

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
Back to top
View user's photo album (10 photos)
cmjohnson



Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s

Posted: Sat May 29, 2010 12:35 am    Post subject:

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
Back to top
CZ Eddie



Joined: 23 Mar 2006
Posts: 1601
Location: Austin, TX

Posted: Sat May 29, 2010 12:40 am    Post subject:

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.

_________________
Back after a digital sabatical.
Back to top
View user's photo album (18 photos)
cmjohnson



Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s

Posted: Sat May 29, 2010 1:04 am    Post subject:

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
Back to top
BradTheAggie



Joined: 08 Mar 2006
Posts: 651
Location: Oak Point, Texas

Posted: Sat May 29, 2010 1:06 am    Post subject:

Here is the green tube:


green tube resized.jpg
 Description:
XG75 green tube face
 Filesize:  34.25 KB
 Viewed:  2217 Time(s)

green tube resized.jpg



_________________
(bholman on the AVS forum)
Back to top
View user's photo album (11 photos)
cmjohnson



Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s

Posted: Sat May 29, 2010 1:40 am    Post subject:

That's pretty watchable. Whoever's watching that PJ will probably stop noticing it pretty quickly.

CJ
Back to top
dturco



Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland

TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner

Posted: Sat May 29, 2010 2:38 am    Post subject:

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]


029.JPG
 Description:
 Filesize:  334.7 KB
 Viewed:  1572 Time(s)

029.JPG



_________________
Firefly rules. Can't stop the signal.

http://www.hulu.com/firefly
Back to top
This forum is locked: you cannot post, reply to, or edit topics.   This topic is locked: you cannot edit posts or make replies.    CurtPalme.com Forum Index -> CRT Projectors All times are GMT
Page 1 of 1
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum