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-   -   Zenith Advanced System 3 picture tube testing (http://www.videokarma.org/showthread.php?t=260360)

sampson159 01-24-2014 07:48 PM

i have a working chassis for that same set.sold the crt to another aker.it was excellent.this one looks good too.love that movie!worlds fastest indian.in my top 10 of all time

Kevin Kuehn 01-30-2014 10:26 PM

I had a friend stop in today that sold these sets back when new. He thought the picture looked fine, and that the horizontal shading effect was normal for these CRT's. Some side effect from the shadow mask he thought. Unfortunately I never really payed to close of attention to how the picture looked back when my folks bought it, so I have no clue if that makes sense or not. I sure don't recall seeing any other color set do this though. :scratch2:

Samson, I agree The Worlds Fastest Indian is a great movie.

Zenith26kc20 01-31-2014 09:39 AM

make sure the screen control on the flyback is not too high. It can cause the tracking to get squirrelly if it is too high (look for retrace lines with the brightness and contrast at minimum. If you see retrace it is too high. If too low, it may not track the black and white properly.
Good job on the cap replacement! You are a patient person to dig all of the "fish oil" caps out! Don't you love the smell when you are unsoldering them?

Electronic M 01-31-2014 07:40 PM

Quote:

Originally Posted by zeno (Post 3093637)
You caught an awesome example of moire, best ive ever seen.
The Zenith folks described it as looking like a finger print
when we first encountered it on the old 14" tube jobs. We
had someone with a new 14" Zenith we sold bring one in for it.
After that it could be spotted in other sets even much older
ones.


73 Zeno

So that is what it is called! My 23" 1971 CCI hybrid does that only to a much more tolerable extent. The moire tends to shift around quite a bit, and produces some cool moving effects when I connect a video camera to it and create a feed back loop by pointing the camera at the screen...

Kevin Kuehn 02-01-2014 12:20 PM

Quote:

Originally Posted by Zenith26kc20 (Post 3094250)
make sure the screen control on the flyback is not too high. It can cause the tracking to get squirrelly if it is too high (look for retrace lines with the brightness and contrast at minimum. If you see retrace it is too high. If too low, it may not track the black and white properly.
Good job on the cap replacement! You are a patient person to dig all of the "fish oil" caps out! Don't you love the smell when you are unsoldering them?

Thanks!

Yes that smell is very nasty. Seems caustic in nature and I suspect it's not good to breath.

Turning up the screen(G2) control produces green retrace lines, advancing further and the screen washes out towards green. Possibly the horizontal shading(stripes) are the result of it attempting to blank the retrace lines under certain scene conditions?

http://i452.photobucket.com/albums/q...g?t=1391276800

http://i452.photobucket.com/albums/q...g?t=1391276840

http://i452.photobucket.com/albums/q...g?t=1391276890

http://i452.photobucket.com/albums/q...g?t=1391190554


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