What causes this? RCA ctc 17 ad x

[ARC Tech-109]

Pops and flashes doesn't sound like a cataract issue, I'd say it's a HV flashover

[damen]

Try tapping on the 12BY7 video output tube and see if that affects it.

Originally Posted by damen

Try tapping on the 12BY7 video output tube and see if that affects it.

Will do now and see

Nope not really, back to the drawing board. I'll study up on the HV rect/reg and output circuits. I have a helpful book on color tv circuits, and color tv troubleshooting book, both of the same vintage as this tv.

[zeno]

IT does look like a cataract but different.
HINT: To make a good color TV first you need a good B&W TV.
For now turn the color down so it wont distract you. See if you can
catch it acting up on video & put on U-tube. A pix worth 1 Kilowords !

73 Zeno
LFOD !

Originally Posted by damen

Try tapping on the 12BY7 video output tube and see if that affects it.

What's funny is this area of the chassis doesn't always make popping sounds, but I generally hear it in this area

[zeno]

Turn lights out to spot arcing. You cant see it in the cage while running.
Look at the HV rect socket & focus tube socket for crud & corrosion.
If you get the humidity high in the room it will arc more. We used to
open the doors in the shop to smoke arcs out.

73 Zeno
LFOD !