[old_tv_nut]

Originally Posted by matthewray2b

Okay here's the third update. This ones a bit longer cuz I went through and did all your requests. There is a bit of talking too. Feel free to put it at 2x speed.

https://www.youtube.com/watch?v=bqKhFlhO_lo

At about 5:00 minutes, the "tangent lines" you point to are the edges of what should be the solid dark bars. Although this is the best fine tuning you have obtained ar this point, it still looks like you are far off the proper tuning point. This effect of seeing edges only means that you are getting only the higher video frequencies (which make edges) and not the whole signal (which would inlcude lower frequencies as well that make solid areas).

The blurry vertical black bars you see earlier in the video are from being very far mistuned, such that you are picking up almost none of the signal and instead are seeing effects of the TV interfering with itself somewhat. (The very high currents in the horizontal sweep can produce a weak interference signal that is invisible compared to a good, properly tuned-in signal from your game.)

"Bas relief" is pronounced "bah relief" and means a shallow carving in stone.
https://www.britannica.com/art/bas-relief

Your sync is not totally floating - the image jumping around or tearing the way it is indicates that the sync circuits are trying to work but are not getting a solid signal to work with.

Turning the H frequency and H hold should find a condition where the diagonals go more or less straight up and down (but still jumping around) and then go diagonal the other way as you adjust further. You had this condition in the earlier videos.

At 8:49 you turn the horizontal frequency and you do get this condition. This is an indication that the H adjustments are good, but again, the sync circuits can't work properly without a solid signal.

Around 9:00- 9:30 you can see a hint of the solid dark sync bar on the left but the main effect is the white "bas relief" edges.

There is still a possibility that the tuner or IF (intermediate frequency) amplifier section is bad in some way worse than just fine tuning. It would be hard to diagnose without opening the set and having the right test gear.

I don't know what the mechanical details of the fine tuning are on this set. I would expect a range of multiple turns with a stop at each end, but the stop could easily be broken. In that case it is possible that the tuning element would fall out of its place fi you tuned too far, but that hasn't happened because you are still getting a tuning action.

Have you been able to go beyond the current best fine tuning point and see if it continues to get better or gets worse again?