My goodness! Sound on Vision. That takes me back a while...50 years in fact. No point in telling you which valve to replace.
Now, one wonders if the power to a video circuit is being dipped by the demands of the audio system. First thing to ascertain is if the visual effects are proportional to the volume
control setting.
If it is, I wouldn't have a bl
y clue as to what is causing the problem.
If it isn't, I wouldn't have a bly clue as to what is causing the problem.