#121
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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
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Yes, I just need to adjust the brightness.
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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
#123
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Quote:
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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) Last edited by SwizzyMan; 11-19-2016 at 09:05 PM. |
#124
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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. Regards, Phil Nelson Phil's Old Radios http://antiqueradio.org/index.html |
#125
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Quote:
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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
Audiokarma |
#126
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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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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
#127
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Any advice anyone? I think I may have a weak tube at this point...
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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
#128
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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
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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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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
#130
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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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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
Audiokarma |
#131
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hook up a CRT tester and find out
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Evolution... |
#132
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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
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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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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
#134
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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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Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#135
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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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Admiral C322C2 Regent (Restoring) RCA CTC-7 Pensbury (Restored) RCA CTC-5 Westcott (Restored) CRA CTC--4 Director 21 (Restoring) |
Audiokarma |
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