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  #91  
Old 04-14-2011, 03:26 PM
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That is wierd, because red and green are supposed to move at plus or minus 120 degrees, and this pattern shows red displaced straight down on the far left. Red is displaced a normal way (down-left) at left center. But it appears that if you fix the left center, the far left will be displaced inward. Red in the lower-center-right has a direct inward displacement. I'm now thinking this could be deflection yoke design or winding tolerance. Purity looks good, so the yoke is not in the wrong position.

It makes me wonder if the yoke from a good CTC-5 can be subbed electrically, just to see what happens electro-optically.

Good luck!
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  #92  
Old 04-14-2011, 04:01 PM
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Well, the only thing I can think of is the wiring mods done at the time the flyback was replaced by RCA. If the polarity was not reversed to work with the positive going pulse coming from the replacement fly (original has a negative going pulse), then it might cause the convergence to operate incorrectly. I guess the next step should be verifying all the convergence stuff, which may take some time.
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  #93  
Old 04-14-2011, 06:27 PM
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I would double-check the values of all the parts in the convergence circuits, especially if any of the controls are not responding the way the RCA service procedure describes them. I don't remember having problems with the one CTC-4 I have done, and on my CTC-5, the convergence was mediocre and not every control worked right. I found out two or three of the caps that had been replaced were the incorrect values, maybe .015 instead of .15 or similar. I fixed that problem and convergence came in pretty nicely.
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  #94  
Old 04-22-2011, 11:00 PM
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Went back and redid all the dynamic setup stuff IAW the Sams booklet, and noticed that I had misread a few of the instructions. I hadn't properly adjusted the horizontal phase slugs to work with the amplitude controls. That's why I wasn't previously able to get the lines to bend the way I wanted. It's still not perfect, but very acceptable for everyday viewing. There's a slight red shadow in the bottom left of the scene, but it's livable. Next I'll have to retackle the matrix alignment because there's too much blue in the picture, and the killer circuit could use a little help as well- it's very touchy. Overall, it's starting to look much better!
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  #95  
Old 05-10-2011, 09:46 AM
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Found that the color killer was wonkey because of incorrect chroma amplitude, a tweak to the color take off and bandpass transformers fixed that. Then all it took was a few minor tweaks to the 3.58 CW transformer (which adjusts the phase of the local oscilator going to each demod), and along with a touch up of convergence and CRT drives it's good enough to call done!

Now I'll move it into the living room, and start enjoying it.
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  #96  
Old 05-10-2011, 12:32 PM
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that set should be enjoyed.looks very good and it will last another 50 plus years.great set and happy that an vker got it.i saw the auction and it is worth every cent you paid!
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  #97  
Old 05-10-2011, 02:01 PM
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?

Maybe you're confused, this is the CTC-4 I picked up in Indianapolis.
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  #98  
Old 05-10-2011, 02:06 PM
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Speaking of 4's, you should come over Nick, I'd like to show you something that I'm sure doesn't happen often......
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  #99  
Old 05-10-2011, 02:07 PM
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Quote:
Originally Posted by sampson159 View Post
that set should be enjoyed.looks very good and it will last another 50 plus years.great set and happy that an vker got it.i saw the auction and it is worth every cent you paid!
Hey RON! Where where you this year?? The convention just wasn't the same....lol
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  #100  
Old 05-10-2011, 03:42 PM
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sorry.thought it was the set at the etf.well this one looks great.didnt make it this year.was out in Tennessee. glad you all had a good time.next year,i m there!
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  #101  
Old 05-10-2011, 07:24 PM
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Quote:
Originally Posted by zenithfan1 View Post
Speaking of 4's, you should come over Nick, I'd like to show you something that I'm sure doesn't happen often......


You mean like a CTC-4 that works on all original caps?

Mine didn't, that thing was used for a solid 20 years before I got it! I often wonder how the flyback could look as good as it does if it was used that much- I know it was replaced at least once, but I don't know if the tag left on the chassis was the only one, know what I mean?
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