Convergence Issue

[Yamamaya42]

Originally Posted by VA561

I want to thank everyone for the helpful advice I received. The winner and undisputed heavyweight champion in this battle was the RCA Wescott. I tried for hours to adjust the convergence but with but with no success. I think Reeferman said it best; If that's a CTC-5 chassis, live with it.
They were a BEAR to converge 55 years ago, let alone 2021.
I too have found the RH side is the biggest culprit.
You might get it marginally better if you play with it enough.
Then again, it may get worse.
At their current age, delta gun sets will not get "perfect" convergence.
Watch the program, not the convergence. I should just be glad that at this point in time the set works! Its obviously not going to be a daily watcher. So on occasion I will sit in my recliner, cross my fingers and turn the set on. It is a piece of tv history that I am just trying to preserve. I have a friend who actually worked at the RCA plant when they were building these sets. He said to consider it a miracle that these old tvs still come to life when you turn the switch on. One thing I will do is to install a computer fan to try and keep the flyback cooler. The red fringing on the right will always bother me but sometimes it is best to compromise and be thankful that it actually works! Sorry if the pictures came out sideways. They were upright on the computer when I uploaded them.

I do agree with what others have said, sight placement of the convergence parts on the neck forward / back could have an effect on this, as most likely with this you CAN NOT see exactly where to put it, I have spent many hours trying to get mine JUST right, and never quite have

[Penthode]

I have a ctc5 deluxe and the convergence is near perfect. The procedure differs from later sets. But if you follow the instructions in the manual, it converges very well.

My CTC5 is running well and we watch it on a regular basis with OTA and OTT via a Roku box.

Curious what convergence issue you have.

[Penthode]

Just as a follow up, I had the same convergence problem as you. I only wanted to point out the convergence procedure is different from later sets. That is that dynamic convergence adustment in the CTC5 interacts dramatically with the static convergence. There is a lot of interaction.

I found that when I got to the point where I wide divergence I could not correct, I found the best thing was start again by centralizing the convergence inductors and potentiometers. And then adhere closely to the CTC5 instructions. Eventually you will find it. Patience counts.

[reeferman]

And good luck.

[Yamamaya42]

At least you don't have to deal with my problem... severe myopia, and the glasses that come with it that causes chromatic aberration, a REAL pain in the ass when you are doing convergence...

[old_tv_nut]

A convergence tip when the vertical convergence is slightly off and you keep chasing it around the screen:

(Does not apply to the large horizontal error you are seeing)

The vertical inearity of my CTC-5 has always been so-so, and the thought occurred that it could affect the convergence. I replaced the vertical sweep tubes, which improved the linearity a bit (still not super) and this reduced the convergence error quite a bit. Still a pain to compromise different areas of the screen, but the compromise is better.

[Penthode]

Wayne, I had the same issue with linearity affecting convergence. The capacitors throughout the vertical sweep circuit had been replaced but could I still could not get it right. Further investigation I found some of the resistors drifted and testing each of the capacitors I had replaced I found some of the new replacements were out of tolerance.

Fixing the linearity helped considerably with convergence. Going over it again and again and again I finally got it right.

[old_tv_nut]

Originally Posted by Penthode

... Further investigation I found some of the resistors drifted and testing each of the capacitors I had replaced I found some of the new replacements were out of tolerance...

Thanks - guess I will have to check values. How much would you say the linearity improved?

[Tim Tress]

Some of those old sets were difficult to get perfect convergence on, especially the early rectangular CRTs. Before trying the procedure again, degauss it.

[old_tv_nut]

Originally Posted by Tim Tress

Some of those old sets were difficult to get perfect convergence on, especially the early rectangular CRTs. Before trying the procedure again, degauss it.

This is an early roundie, with a metal picture tube. Degaussing a metal tube is not simple because it has edge magnets that are adjusted as a final step in obtaining color purity. If you use a degausser after that final adjustment, you will counter it and possibly make it impossible to obtain edge purity. The purity adjustment procedure must be done in correct order completely from start finish, or as a minimum, the edge magnets must be retracted into their shells before using a degaussing coil. Then the edge purity adjustments have to be redone.

Trying to improve convergence by degaussing is futile, as the degaussing, purity and covergence adjustments for the metal tubes have to be done in that order.

[reeferman]

Again, good luck.