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  #121  
Old 11-18-2016, 10:00 PM
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You say "superior black and white picture", but I don't see the correct luma in the color bars. Do you actually get nice gray level steps on the color bars when you turn the color down?
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  #122  
Old 11-19-2016, 06:17 AM
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Yes, I just need to adjust the brightness.
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  #123  
Old 11-19-2016, 08:59 PM
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Quote:
Originally Posted by Electronic M View Post
One thing you should do is degauss it and perform a purity adjustment.

A note the coil that changes the hue and relative demodulation of the different bars has 2 slugs one bottom and one top (should be flat edge blade adjustments)...On that coil you want to adjust both simultaneously with plastic adjustment tools (metal ones will skew the adjustment once removed).
Ill have to try both of those suggestions. Anyone else have any ideas? I almost feel the weak red gun may partly be at play here.
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Last edited by SwizzyMan; 11-19-2016 at 09:05 PM.
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  #124  
Old 11-20-2016, 02:52 AM
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Instead of trying adjustments piecemeal, I would recommend working through the setup procedures described in the service manual. This article has a link to the 91-page RCA manual:

http://antiqueradio.org/RCACTC-4ColorTelevision.htm

Those procedures include purity, convergence, tracking, color AFC, etc. Follow the order given in the manual. First, as noted, make sure you have a good "black and white" picture. Then comes purity, and so on.

There's a reason why the factory doc describes this stuff in detail and in a particular order. The complete setup on an early color set is not something that the average consumer could "eyeball" by whipping out a screwdriver and turning random adjusters for a minute or two.

If you're patient and your TV is in good shape, the CTC-4 will reward you with a very nice color image.

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  #125  
Old 11-20-2016, 06:36 AM
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Quote:
Originally Posted by Phil Nelson View Post
Instead of trying adjustments piecemeal, I would recommend working through the setup procedures described in the service manual. This article has a link to the 91-page RCA manual:

http://antiqueradio.org/RCACTC-4ColorTelevision.htm

Those procedures include purity, convergence, tracking, color AFC, etc. Follow the order given in the manual. First, as noted, make sure you have a good "black and white" picture. Then comes purity, and so on.

There's a reason why the factory doc describes this stuff in detail and in a particular order. The complete setup on an early color set is not something that the average consumer could "eyeball" by whipping out a screwdriver and turning random adjusters for a minute or two.

If you're patient and your TV is in good shape, the CTC-4 will reward you with a very nice color image.

Regards,

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html
I'll go through a complete set up procedure today and report back with my findings. I probably could be a bit more patient with this set but I'm a bit behind schedule on my goal to have a decent picture by Christmas.
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  #126  
Old 11-20-2016, 10:42 AM
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So I tried going through the setup as indicated by the manual and I couldnt even get past screen temp without an issue. I followed the instructions in the manual. I couldnt get the "barely visible red screen" and I think I know why. I went to measure the bias on the Red grid and cathode as i adjusted the brightness and the voltage was way too low. Im talking almost 200v below the intended 70v. I did have all controls adjusted correctly while checking the bias and adjusting the brightness for a dim red raster. I suspect a resistor downstream of the red screen control or downstream of the cathode and grid has drifted way too low or has even shorted. I guess ill have to do some investigation. This all seems odd since I at one point did have red in my color picture and things looked pretty watchable, but now its kinda taking a turn for the worse. I have one picture attached of what it used to look like before I really recapped any paper caps.
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  #127  
Old 11-23-2016, 06:43 PM
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Any advice anyone? I think I may have a weak tube at this point...
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  #128  
Old 11-23-2016, 06:53 PM
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With my CTC4 I ended up getting all NOS tubes which I've never done for any radio or TV. BUT these early color sets run them too hard. I can't get stable color with any of my used tubes in the chromiance section even though they test fine on the Hickok.
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  #129  
Old 11-23-2016, 06:59 PM
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Quote:
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With my CTC4 I ended up getting all NOS tubes which I've never done for any radio or TV. BUT these early color sets run them too hard. I can't get stable color with any of my used tubes in the chromiance section even though they test fine on the Hickok.
Good idea John. I did suspect the 12BH7 r-y demod. Tested fine. I'll pick a whole new set except for h-out and he circuit tubes.
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  #130  
Old 12-04-2016, 06:35 PM
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Could this be a weak red gun? Id think if the red was weak of course shades of certain colors that use red would be way off. I just need to know if I should start hunting for another tube.
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  #131  
Old 12-07-2016, 03:41 PM
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hook up a CRT tester and find out
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  #132  
Old 12-07-2016, 04:10 PM
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That set has so many major problems that the LEAST of your worries should be the condition of the CRT. Replacing the CRT is not going to be some magical cure for your issues. Put it on a tester if you like, but even a good tube would produce a terrible picture when driven by that chassis.
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  #133  
Old 12-07-2016, 06:19 PM
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I didn't believe it would be a magical cure, but the red gun tests really weird and I thought that it might be a pretty weak gun and in result colors that use red would be either not present or incorrectly colored. This set is a real pain so far. But I'm going to just start with a fresh brand new set of tubes and go from there. Something tells me I will probably be doing some alignments . The red gun on the CRT tests good at first but then 1 second later the needle swings pretty erratically but the swinging stay within the ? And good range. Both other guns do this but not nearly as much. And I've found also that the red screen control does almost nothing too, I'll have to check it.
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  #134  
Old 12-07-2016, 06:35 PM
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Does your CRT tester's instructions mention how a gassy tube should test....It might be getting gassy.
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  #135  
Old 12-07-2016, 06:46 PM
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Quote:
Originally Posted by Electronic M View Post
Does your CRT tester's instructions mention how a gassy tube should test....It might be getting gassy.
No it doesnt. It did this when I got it about 4 months ago so if it's getting gassy it's extremely slow and it isn't gassy enough to kill the picture. I don't think it's gassy.
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