My Brand New CTC-7!

[SwizzyMan]

I do apologize for not always giving you adequate info in my posts. I am afraid I may have accidentally adjusted T704 and not L704. I will swap out some of the tubes in the chroma though and will report back with my findings.

[DaveWM]

do you know how much of an adjustment you may have made on T704?

FYI at most the L704 would be 1/2 turn either way, and the effect is instant (as soon as you move any at all the number of rolling bars should go up or down. Down is the way you want until it locks, again for me this has been about 1/4 turn). generally speaking if adjustment of coil does not have an immediate response, its likely you are adj the wrong coil. Coils are resonate devises not like pots that have a more linear response.

the tube you want to swap 1st would be the reactance/osc 6U8 this assumes you really have a color osc problem.

I pic of the color snow from the color killer adj was requested to confirm the color osc is running and working as it should(since I had no pic of the rolling bars).

[DaveWM]

https://www.youtube.com/watch?v=RAk9lKv03zA

review this again, regardless if you set is getting color programming to work, does the fine tune behave the same (pic to loss of sync).

Does the color killer work the same (snow and color snow).

the idea is to isolate where the problem is, the above gives clues. It prob is just a tweek of L704 based on my interpretation of your descriptions. BUT the idea here is to learn how to trouble shoot in a logical systematic approach.

[SwizzyMan]

Uploading picture now

[SwizzyMan]

Here it is please note that the rainbow is rolling very fast downward. And I adjusted T704 maybe a half turn both ways.

[DaveWM]

and the fine tuning does it do like in my video, gets dark and lose sync.

you are prob ok on T704 deal with it later.

[SwizzyMan]

If I turn the fine tuning all the way clockwise I lose the rolling rainbows. Turning it all the way ccw I lose sync.

[DaveWM]

are you sure you are on the right channel? that sounds backwards on the fine tune like you are off one channel. Try going up or down one channel from where you are and fine tune again. CW would cause you to lose sync.

[SwizzyMan]

Well I went one channel down and I dont lose sync at all but I lose the rolling color bars when I turn all the way ccw. The rolling color bars get a lot brighter when I turn the fine tuning all the way cw. Now on the upper channel when I turn the fine tuning cw I lose sync only after about less than a quarter turn note that I am starting from all the way ccw.

[DaveWM]

something is not right, you should be able to lose sync. I assume you are using the standard 3-4 channel output converter box?

[SwizzyMan]

No I am using my signal generator.... Should I hook up my converter? Would it be easier to call you for this?

[DaveWM]

Originally Posted by SwizzyMan

Well I went one channel down and I dont lose sync at all but I lose the rolling color bars when I turn all the way ccw. The rolling color bars get a lot brighter when I turn the fine tuning all the way cw. Now on the upper channel when I turn the fine tuning cw I lose sync only after about less than a quarter turn note that I am starting from all the way ccw.

Ok I just checked mine, the CTC-7 tuner is a bit different than the one in the video(video has tunable slugs for each channel, ctc-7 has a VC that effects tuning on all channels), so its possible that you may not lose sync (mine did but just barely).

but it was def fully CW for loss of sync and CCW I would lose color sync (rolling bars) on my CTC-7.

triple check what channel you are on and what channel the output is, but IMHO you need to be on the channel that has fully CW for loss of sync/dark pic.

You may have a problem with a converter tube in the tuner, OR your AGC may need to be adjusted.

confirm the channel and fine tuning operation 1st

then try a different converter tube in the tuner to see if that makes an difference.

lastly will adj the AGC, I did not want to go there since the CTC-7 has a different approach to that than later models, but its not a big deal and you can aways reset to the orig starting point.

[SwizzyMan]

Triple checked everything replaced tube no luck. I am pretty sure I do know which way clockwise and ccw are. To be sure when I turn the fine tuning all the way to the right I lose the rolling color and if I turn the fine tuning all the way to the left I lose sync.

[SwizzyMan]

Should I try adjusting L704 just to see if I can get any color or should I leave that until I get my tuning problem fixed?

[DaveWM]

turning right (CW)should cause the pic to become dark and lose or start to lose sync turning to the left (CCW) should start to lose definition of the pic (blurry).

did you confirm the channel on the output from the signal devise? 3 or 4 for most common consumer grade RF modulators used on dvd or digital to analog converter boxes.

I suppose its possible there is a gear reversing the direction of the tuner on your set, perhaps someone with the exact same model can chime in to confirm the fine tube adjustment.

If the osc slugs used for the gross setup are way off on one channel I suppose you could have an issue with backward fine tuning.

Try another video source with a different channel output and confirm the operation of the fine tuning, see if it works the same way for different channels (assuming you have access to devises that can output to more than one channel). confirm the outputs as well with more modern tvs that still have an analog tuner.