Sparklies in the picture

[6GH8cowboy]

Working on a RCA KCS126 chassis for a fellow collector. Replacing 7 missing tubes, fixed the vertical, an AGC issue, whiskers in the brightness control, and a blown balun in the tuner, I now have sparkles in the picture. Now, I'm not talking snow or low signal noise, I'm talking white fine dots like folks used to get on satellite receivers. I've looked for noise sources near me and bad antenna cable connections, battery chargers, light fixtures, as well as internal to the chassis itself. No luck. I'll include a photo but the dots dont show up well at all. There seems to be no corona or arching in the HV fly-back area. The CRT test weak but is giving a decent image.
Any ideas?

[old_tv_nut]

Better description of the sparklies? Where are they on the screen? Are they in slowly rolling bands like motor brush interference, for example?

[6GH8cowboy]

They don.t roll or appear synchronous, or have any pattern like another tv with something arcing, kind of random. . There is nothing in the sound, it's clean.

[Tube TV]

Kind of a long shot but check that the aquadag is grounded on the crt and the grounding finger is clean .
Usually this problem will produce very heavy small sparkles on the screen and sometimes changes if you adjust the brightness control up or down.

[damen]

When you see the dots on the screen, remove the 3rd video IF tube and see if they remain. Used to have a lot of trouble with GE brand video output tubes doing something similar to what you are describing.

[6GH8cowboy]

CRT ground was it. Tightened down the chassis to the cab ( w/ gnd strap) and GONE! I've seen this before, Thanks. Sometimes it takes another brain to see the forest, Again thanks for the insight.

[6GH8cowboy]

[old_tv_nut]

Glad this got followed through here - something to tuck in the back of my brain for future reference.

[old_coot88]

Open or flaky dag grounding or dag "islands" can cause weird effects mimicking sync/agc issues, and as now learned, 'sparklies'.