[Chris K]

Originally Posted by Yamamaya42

From what I remember, these sets hate dirty video, if after following old_tv_nut's steps does not find any faults, one thing you may want to try is to feed in composite video, which can be done by removing the 4th pix if (v113) and feeding in video ( capacitor coupled) to the grid of the 1st video amp, pin 1, v115, and see if the h-lock is more stable.

Looks like I'm going to have a busy night when I get home!!!