Zenith Advanced System 3 picture tube testing

[duckland 23]

You have directv hooked up to it . My Sony television will do the same thing too . Try a dvd player and see how the picture is . Im betting it one of your coax cables causing that bad picture or something in the tuner getting the signal . Check your cables

[Kevin Kuehn]

Actually it is a DVD player with separate RCA audio and video cables hooked to the TV.

[zeno]

An odd symptom. If it comes & goes try light tapping
of the CRT neck & see if it flashes. Can also swap the
transistors around & see what happens. Also run your tester
up a little on the filaments & see if it smokes out leakage.
Try it at 8V. These sets did some strange things when the
CRT's were bad.............

73 Zeno

[Kevin Kuehn]

Whatever it is it likes to manifest itself on mostly light blue screens. The moire effect makes it a little tough to see below. The color rendering looks great to me. I'll try testing the CRT again later.

[Kevin Kuehn]

More pictures...

http://i452.photobucket.com/albums/q...ps91760968.jpg

http://i452.photobucket.com/albums/q...ps178f8654.jpg

http://i452.photobucket.com/albums/q...ps505032fb.jpg

http://i452.photobucket.com/albums/q...ps814fa621.jpg

http://i452.photobucket.com/albums/q...ps15b27b4a.jpg

http://i452.photobucket.com/albums/q...ps4ac0770b.jpg

http://i452.photobucket.com/albums/q...psdd1916eb.jpg

http://i452.photobucket.com/albums/q...psdbda94d2.jpg

[zenith2134]

The minor purity issue really isn't showing too badly on a red raster. It's a non-issue from where I'm sitting. Usually the red raster is the one to exploit 'impurities' in the crt setup.
One of my neighbors still uses this exact type of system 3 on cable. I don't recall there being any problems with it. I believe it was a 1992 model.

[zeno]

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.
One things for sure, all 3 guns have great emission. Like I
said these jugs did odd things when bad, you couldnt glance
at them & say "bad CRT" a lot of times. Sometimes it was like
someone was in back changing the grey scale slowly so
you couldnt do a set-up. Good one minute & bad the next but
not by much.
For the purity take a little magnet from a junker, put it on
the corner of the bell. Slide it in & out & rotate it for good
purity, works most the time.

73 Zeno