Are these things I should consider bad

[old_tv_nut]

Did you move the scope probe ground lead during taking this series?
[Edit: you should connect the ground lead of the probe you are using to the chassis, keep it attached at one particular point for all the measurements, and do not connect any other scope ground leads to the chassis.]

The "fat" traces could be superimposed 60 Hz hum due to intermittent probe ground (can't tell from stills, but you could verify by slowing the scope sweep to vertical rate).

In any case, there appears to be ripple on the green cathode and grid, less on red and blue. Why they should be so different doesn't make a huge amount of sense, unless it varies with the scope probe grounding, because the bars you have shown pictures of appear to be monochrome - so they should be in all three guns.

Also, in the off-screen shots with a regular picture, the bars aren't visible. Are they visible to the eye at all with a regular picture, or only with a plain black scene?

[TinCanAlley]

Originally Posted by old_tv_nut

Did you move the scope probe ground lead during taking this series?
[Edit: you should connect the ground lead of the probe you are using to the chassis, keep it attached at one particular point for all the measurements, and do not connect any other scope ground leads to the chassis.]

The "fat" traces could be superimposed 60 Hz hum due to intermittent probe ground (can't tell from stills, but you could verify by slowing the scope sweep to vertical rate).

In any case, there appears to be ripple on the green cathode and grid, less on red and blue. Why they should be so different doesn't make a huge amount of sense, unless it varies with the scope probe grounding, because the bars you have shown pictures of appear to be monochrome - so they should be in all three guns.

Also, in the off-screen shots with a regular picture, the bars aren't visible. Are they visible to the eye at all with a regular picture, or only with a plain black scene?

The ground was connected to the same spot for all tests (I used the ground on the CRT socket). I will try to bring down the sweep rate and see if the waveform clears up.

The bars are most noticeable when the screen is darker like in a transition between scenes. You can see them with color screens, but only if the colors are light/pale.

I'm wondering if my 750V boost is working as designed. I haven't looked at it until today. So far all I did was check its voltage. It's 761VDC. I didn't check the AC as my DMM isn't a true RMS. I'll need to put it on the scope to see the AC. I figure I can start at the diode that steps it up and work my way to the G2 controls.

[jr_tech]

Originally Posted by TinCanAlley

I will try to bring down the sweep rate and see if the waveform clears up.

Possibly the "fat traces" are due to a very high frequency component riding on the waveform, so increasing the sweep speed might reveal its shape. Use the internal triggering of the 'scope to see if you can trigger on the superimposed (and presumably extraneous waveform) and display it to determine what it may be. So try both higher as well as lower sweep rates.
jr