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  #271  
Old 08-23-2017, 10:22 PM
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SwizzyMan SwizzyMan is offline
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Quote:
Originally Posted by miniman82 View Post
Uh, that's how you're supposed to do it...

Read the alignment instructions, or better yet if you have a B&K 415 use that it'll cut your time in half.
Don't have a 415, but I do believe I have all other necessary equipment. Bear with me here, this is my first IF alignment on a color tv. I've been lucky I haven't had to do any till now.
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  #272  
Old 08-24-2017, 02:26 PM
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Phil Nelson Phil Nelson is offline
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I like Bill R's suggestion of setting up to do a video IF alignment and viewing the traces to judge whether alignment is a significant problem. That is, look -- following the procedure in the factory manual -- but don't touch any adjusters the first time around.

If you haven't done the procedure before, that would also give you confidence that your setup is correct and you are viewing valid things on your scope.

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  #273  
Old 08-24-2017, 04:48 PM
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The alignment instructions for this seem pretty involved! Don't know if I am quite up to the task yet... Can anyone lead me in the right direction? If push comes to shove I'll just try and build a video preamp.
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  #274  
Old 08-24-2017, 05:19 PM
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Phil Nelson Phil Nelson is offline
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Do you have a restored B/W set that works well, that you could use to practice alignment (again, doing the setup and looking at the traces, without changing adjustments)? The setup wouldn't be identical, but maybe that would help you get the hang of things.

I had reached a similar point with my CTC-4 and I took a stab at building a video preamp, which turned out to be not as simple as I hoped. This old thread has more details:

http://www.videokarma.org/showthread...259995&page=23

The last color bars that you posted look pretty good, apart from that one anomaly. What does the TV look like when you view regular content, such as a DVD or cable TV? Sometimes things that look less-than-perfect in test patterns don't interfere much with everyday viewing.

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  #275  
Old 08-25-2017, 06:11 PM
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SwizzyMan SwizzyMan is offline
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Quote:
Originally Posted by Phil Nelson View Post
Do you have a restored B/W set that works well, that you could use to practice alignment (again, doing the setup and looking at the traces, without changing adjustments)? The setup wouldn't be identical, but maybe that would help you get the hang of things.

I had reached a similar point with my CTC-4 and I took a stab at building a video preamp, which turned out to be not as simple as I hoped. This old thread has more details:

http://www.videokarma.org/showthread...259995&page=23

The last color bars that you posted look pretty good, apart from that one anomaly. What does the TV look like when you view regular content, such as a DVD or cable TV? Sometimes things that look less-than-perfect in test patterns don't interfere much with everyday viewing.

Phil Nelson
Phil's Old Radios
https://antiqueradio.org/index.html
Still isnt great while viewing programs. Ghosting and the picture looks overdriven which may be to the fact that it is hooked directly up to the cable box. I don't think IF is an option for me now. If it really needs to be done I guess I can try it.
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  #276  
Old 08-25-2017, 07:12 PM
old_coot88 old_coot88 is offline
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As Phil suggested, practice alignment on a BW set. You don't wanta jump on a full dress Harley without being proficient on a more basic bike.
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  #277  
Old 08-25-2017, 08:18 PM
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Regarding a video preamp, I just updated my CTC-4 article with a new section at the end, describing what I built:

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

My preamp didn't work, due in part to a wiring mistake. I fixed that and messed around a little more, and then pushed the whole thing aside because I was burned out on the project.

Anyhow, I have to believe that the basic design, taken from the 1956 article in RCA Broadcast News, will work if someone takes the time to build it correctly.

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  #278  
Old 08-25-2017, 10:48 PM
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SwizzyMan SwizzyMan is offline
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Quote:
Originally Posted by Phil Nelson View Post
Regarding a video preamp, I just updated my CTC-4 article with a new section at the end, describing what I built:

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

My preamp didn't work, due in part to a wiring mistake. I fixed that and messed around a little more, and then pushed the whole thing aside because I was burned out on the project.

Anyhow, I have to believe that the basic design, taken from the 1956 article in RCA Broadcast News, will work if someone takes the time to build it correctly.

Phil Nelson
Phil's Old Radios
https://antiqueradio.org/index.html
Wow, that will definetly be project... Hell, I'd pay someone to build me one.
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  #279  
Old 08-26-2017, 12:05 PM
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Not trying to hijack the thread, but I'm also working on a CTC4 with some similar problems. Possibly we can help each other.

So far, it's been recapped and I've replaced all the out of tolerance resistors I can find. It produces a reasonably good B&W picture, but the chroma is VERY noisy. It looks like the kind of noise you see if the fine tuning is way off, or with heavy RF interference, but the picture looks good with the color turned down. Sound is also good.

I'm not sure what's normal for a CTC4, but I find that I have to set the color control a lot higher than on most other sets. I suspect it could be a problem with the chroma band pass (misalignment or low gain).

I have not checked the alignment yet other than the basic chroma demodulator adjustments. I can do a full alignment if I have to, but this one looks like a very complicated job.
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  #280  
Old 08-26-2017, 10:30 PM
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SwizzyMan SwizzyMan is offline
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Quote:
Originally Posted by andy View Post
Not trying to hijack the thread, but I'm also working on a CTC4 with some similar problems. Possibly we can help each other.

So far, it's been recapped and I've replaced all the out of tolerance resistors I can find. It produces a reasonably good B&W picture, but the chroma is VERY noisy. It looks like the kind of noise you see if the fine tuning is way off, or with heavy RF interference, but the picture looks good with the color turned down. Sound is also good.

I'm not sure what's normal for a CTC4, but I find that I have to set the color control a lot higher than on most other sets. I suspect it could be a problem with the chroma band pass (misalignment or low gain).

I have not checked the alignment yet other than the basic chroma demodulator adjustments. I can do a full alignment if I have to, but this one looks like a very complicated job.
Your set sounds like a carbon copy of mine. Same problems. It's probably a matter of IF alignment.
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