RCA CTC-5 Westcott help

[Radiotronman]

If I turn the color control on and all the way up, I start to see more blues and greens, but still looks terrible.

[old_tv_nut]

Originally Posted by Radiotronman

If I turn the color control on and all the way up, I start to see more blues and greens, but still looks terrible.

This COULD be as simple as a fine tuning problem. I would do a quick check of what the picture looks like with a DVD or VCR, and if I could get it fine tuned right, go back to the color bar generator and make sure the channel frequency and fine tuning are right there.

[oldtvman]

Color sets back then involved a two step process, first you set the parameters of a B & W picture and then you add color. Purity adjustment would be the first step to getting proper registration and then set the convergence. Your photo looks like ac running thru the picture which means you probably have leaking filter capacitors coming of the rectifiers.

[Electronic M]

That is some poor convergence for having been adjusted. It also looks like your greyscale (balance of gun settings) is off, not to mention the purity.

With purity and convergence that far off color will not look good even if the circuits are working right.
Turn the color off, get purity perfect, try to improve convergence significantly (you may need to check the convergence circuits and convergence yoke position if that is the best it will do), set the greyscale so the blacks are black and the whites are white, get the brightness and contrast set for good monochrome pic then and only then turn up the color and try to get that right.

When the CRT setup is that poor turning on the color circuits is little more than a check of life in those circuits, since the CRT setup problems will bury the noticability most other issues....

[matt.caputo]

Just went through this with my Packard Bell that uses an RCA CTC-5 chassis. Send me a PM with an email address and I can forward you some photos. I just havent figured out how to attach them as a reply in this forum yet from my phone. These sets will show a fairly decent picture if set up properly.

[old_tv_nut]

Another hint about the dynamic convergence on this chassis: it is AC coupled. This means that the center (DC) convergence moves when the dynamic is adjusted. One way to approach this (with a cross hatch pattern) is to first set the center DC, then adjust the dynamic controls to get parallel lines, then re-adjust the DC, which should superpose the parallel lines, at least approximately. Then you can do some fine dynamic touch up if you want, but don't get obsessive, because it will never be perfect everywhere. You can spend hours chasing slight misconvergence from one corner of the screen to another.

[miniman82]

Only real solution to this problem, and it's a pretty bad problem, is for someone to sit down and figure out exactly how to add the diode pack the later chassis had. They keep things from moving around too much on dynamic convergence setups, vastly reducing the year out your hair factor.

[oldtvman]

If you have an oscilloscope checking the dc power supply for any ac would be the first thing and then checked all the B+feeds from the power supply. Sometimes the problem is starring you right in the eye.