Colour faded/ less vibrant (but chassis not the cause)

[chaos7]

I have a Zenith CRT 63cm in a 1990 LAI cabinet that was keep in storage for last 15 years and just recently turned on last month. The colour is faded mostly with the green, a little with the red and tiny bit with blue and I adjusted the RGB on the neck board and chassis for 30 mins but it only reduced the colour and tinted the white. However there is no problem with the neck board or chassis as it works with full colour with another identical CRT. I also eliminated the game board and video cable as a possible cause as I plugged the video cable from another machine into the input of the chassis but it made no difference on the screen. As it was 15 years ago when I had it running I can't remember the quality of the picture before I stored it. I believe my worst fear might be true and the cause is the CRT picture tube itself. I hope someone can advise on what I can do (if anything) to improve the colour vibrancy (there is no problem with lack of brightness). I'm in Melbourne and there is no tech I have found that has a rejuvenator and even then I have heard stories where it destroyed the CRT in a few cases. I am hoping for just some simple cheap solution or adjustment to try, if not I will just leave it as it is. In the photo with the test colour screen the green is not as white as seen in the photo (it's bad but not as bad in photo - perhaps my phone camera is crap)

[buttersoft]

AA is a better place to post for local attention, but i see you've already posted on there.

There's also the AA facebook group you might try, seems to pull a slightly different crowd.

[Zebidee]

I know that you've tried the chassis with another CRT, but have you done it the other way around as well (use another chassis with this CRT)?

Maybe tube purity is an issue. In that case you'd need to do some fiddling with the yoke. Fun fun fun! Otherwise yeah tired guns. From the pics it still looks "serviceable", maybe tweak the RGB gain and cutoffs a bit.

[chaos7]

Yeah I had already swapped them over. They are both identical and had same amount of use but still changing the chassis and neck board made no difference. I understand fading can happen when the guns get weak over time but my two 30year old neo geo's were put in storage at same time in 2005 and just recently taken out. I was hoping that since they had just as much use since and ones one has colour faded (mostly the green) that there might be another fixable solution.

[Zebidee]

Maybe one got a bang and it moved the yoke


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