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  #61  
Old 01-30-2016, 12:16 PM
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miniman82 miniman82 is offline
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I think you can get it lower, but I also think it doesn't matter much on a 5. The flyback primary just doesn't have a low enough DC resistance to make much power (or heat), which is also the same reason it will never draw enough current to make decent HV at the secondary. Run it for a good half hour, then power down and check flyback temp with your hand after HV discharge. My guess, it won't even be warm to the touch. I did everything I could to mine trying to push more out of it: installed a drive control and cranked it to max, installed a HV pot and cranked it to max, put in the strongest testing 5U4 and 3A3 rectifiers I could find, nothing helped at all. Since you can't change the primary resistance in the flyback, the only other thing likely to help is increasing voltage to the circuit. You might try using silicon rectifiers in place of the 5U4's, but I still don't think it would make much difference. The 5 just is what it is, and we have to deal with it.
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  #62  
Old 01-30-2016, 12:23 PM
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Quote:
Originally Posted by miniman82 View Post
I think you can get it lower, but I also think it doesn't matter much on a 5. The flyback primary just doesn't have a low enough DC resistance to make much power (or heat), which is also the same reason it will never draw enough current to make decent HV at the secondary. Run it for a good half hour, then power down and check flyback temp with your hand after HV discharge. My guess, it won't even be warm to the touch. I did everything I could to mine trying to push more out of it: installed a drive control and cranked it to max, installed a HV pot and cranked it to max, put in the strongest testing 5U4 and 3A3 rectifiers I could find, nothing helped at all. Since you can't change the primary resistance in the flyback, the only other thing likely to help is increasing voltage to the circuit. You might try using silicon rectifiers in place of the 5U4's, but I still don't think it would make much difference. The 5 just is what it is, and we have to deal with it.
Got it down to 200ma by decreasing the line voltage by 2 volts to 113 or so. Still pushing about 21.45 Kv nice and bright. I think it is ready for service.
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  #63  
Old 01-31-2016, 10:59 AM
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Here is the finished product. My camera makes the picture look a bit washed out in some photos. It is perfect in person though. And there is a picture of me with the TV after we just picked it up.
Attached Images
File Type: jpg DSC_0668.jpg (66.6 KB, 99 views)
File Type: jpg DSC_0671.jpg (58.8 KB, 78 views)
File Type: jpg DSC_0672.jpg (59.4 KB, 69 views)
File Type: jpg DSC_0673.jpg (65.8 KB, 118 views)
File Type: jpg new tv.jpg (51.4 KB, 111 views)
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  #64  
Old 01-31-2016, 11:35 AM
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Originally Posted by swizzyman View Post
here is the finished product. My camera makes the picture look a bit washed out in some photos. It is perfect in person though. And there is a picture of me with the tv after we just picked it up.
nice!
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  #65  
Old 01-31-2016, 11:28 PM
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That's looking pretty good.

Enjoy!

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  #66  
Old 02-01-2016, 08:51 PM
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Looks good ! That's the way I got mine home too !

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  #67  
Old 02-02-2016, 02:19 PM
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Not quite satisfied with the color temperature. While trying to do a proper temperature setup I ran into some difficulties. The manual says to turn the green and blue background controls 30% up from being at counter clockwise. And to turn the contrast control to the halfway position. I know what all this means but how could I tell where 30% is on the screen controls and where halfway on the contrast control is?
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  #68  
Old 02-02-2016, 02:54 PM
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That looks great! It's inspired me to start my ctc9 very soon!
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  #69  
Old 02-02-2016, 04:30 PM
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Quote:
Originally Posted by SwizzyMan View Post
Not quite satisfied with the color temperature. While trying to do a proper temperature setup I ran into some difficulties. The manual says to turn the green and blue background controls 30% up from being at counter clockwise. And to turn the contrast control to the halfway position. I know what all this means but how could I tell where 30% is on the screen controls and where halfway on the contrast control is?
They are asking to set mechanically at a certain fraction of full travel (which should be somewhat less than a full circle max). So, just try the full mechanical range to see how far the control can turn and then set it an estimated halfway or 30% of the way as instructed. These are just starting points to get you somewhere with visible light on the screen.
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  #70  
Old 02-02-2016, 06:33 PM
old_coot88 old_coot88 is offline
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When our shop entered the color market with the CTC-15, we went to 'RCA School' put on by the distributor, where we learned setup procedure from factory reps. They
had us do the whole procedure with both the blue and green Drives at max . Then as a final touchup, back either one (or both) down a bit to get desired 'temp'. The reps may have been "off the book" regarding the Drives, but that's the way we leart it and always did it.

Or, book procedures on earlier chassies may have been different.

In those screen shots of you CTC-5 running, it looks like the contrast is a mite low.

Last edited by old_coot88; 02-02-2016 at 08:43 PM. Reason: typo
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  #71  
Old 02-02-2016, 06:53 PM
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Did what you suggested old coot. Picture looks a lot better. Only problem is that the chroma hue drifts while the set warms up for 10 minutes then goes away but still very very slowly drifts. The contrast is no longer an issue here. The camera caused the bit of washed outness if you will.
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  #72  
Old 02-02-2016, 08:34 PM
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Alright THIS is the finished product. I promise this time.
Attached Images
File Type: jpg DSC_0683.jpg (70.7 KB, 68 views)
File Type: jpg DSC_0685.jpg (32.2 KB, 56 views)
File Type: jpg DSC_0686.jpg (42.4 KB, 67 views)
File Type: jpg DSC_0693.jpg (33.8 KB, 70 views)
File Type: jpg DSC_0692.jpg (40.2 KB, 71 views)
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RCA CTC-7 Pensbury (Restored)
RCA CTC-5 Westcott (Restored)
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  #73  
Old 02-02-2016, 09:53 PM
DaveWM DaveWM is offline
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crank that color down its way over saturated.
I think it should be more like this

http://videokarma.org/showpost.php?p...&postcount=224
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  #74  
Old 02-02-2016, 10:24 PM
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Electronic M Electronic M is offline
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Quote:
Originally Posted by SwizzyMan View Post
Alright THIS is the finished product. I promise this time.
Tube color TVs are never "finished", as long as they can be powered on there is ALWAYS SOMETHING that you could say needs to be done if you look close enough...

That said Dave likes them a bit too pale, swizzy likes them a bit too saturated, and red is up a bit too high relative to the other primaries.
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  #75  
Old 02-03-2016, 09:31 AM
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dtvmcdonald dtvmcdonald is offline
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Dave's is the correct saturation, the picture is just too blue.

But to all of you with these old TVs, let me admonish you,

PLEASE!! PLEASE!!!

One word!

Doilies!!!
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