What is this?

[jr_tech]

This is making my head hurt... I have never seen anything like it before!

So you get the same color pattern with any gun turned on? or does the pattern change?

The moire' pattern produced here makes me think that the shadow mask is totally out of alignment with the phosphor dot structure, as if one of the support springs has become detached, and the entire mask structure has moved back. The fact that the repeating patterns in each color bar become larger toward the bottom of the screen suggests that the mask is perhaps tilted further from the screen at the bottom. All this is purely a WAG, as I have never seen this occur.

If you lightly tap the screen, do the colors move around? If the shadow mask was torn, you might observe a fair amount of shifting of the pattern.

jr

[wa2ise]

Mis-aligned electron guns? If the gun assembly got slightly twisted, or too close or distant, when they were reattaching the neck of the new guns to the CRT tube? I don't know what tests Hawkeye does after a rebuild, presumably more than an emission of the cathode test...

Can the metal parts of the electron gun get magnetized? Maybe a degaussing of the neck might help.

Would the deflection yoke being too close or distant (front to back) do this?

If it's the mask, maybe it can be coaxed into position with a magnet? But you'll need to degauss afterward.