My Brand New CTC-7!

[DaveWM]

a video would be a good idea of what you have now. Show some reg color programing and adjust the fine tuning from smear to wormey

before touching any coils you really need to eliminate all other possible issues. diddle stick drift is the worst thing to deal with.

based on the video it should be determined that the color osc is running and or synced properly. color killer is also an issue. There is a lot that cause the color circuits to not work right, coils adjustment would be the last place to look, esp if the osc is not running or is WAY off. any tweeks would be minor UNLESS someone has gotten into it (the reference to diddle stick drift).

of all the color sets I have worked on with respect to coil adjustments, the most that was required was a 1/4 turn on coil in the osc circuit (rare). Most of the time it was a dirty pin/weak tube/cap/pot issue. Its aways best to start with the obvious and easy. fine tuning and signal 1st, Tubes in chroma, wiring from controls, the pots themselves, settings of color killer.

To the others that are helping, I am pretty sure the OP has not touched any of the now suspect film caps in the chroma circuits.

[Phil Nelson]

Originally Posted by DaveWM

I am pretty sure the OP has not touched any of the now suspect film caps in the chroma circuits.

Aha. Yes, start with the obvious. After I recapped my CTC-7, including chroma circuits, it looked so good that I did not mess with any of the color setup. Sometimes it's better to let sleeping dogs lie.

Phil Nelson

[SwizzyMan]

Is the chroma located in the underside portion of the chassis? Because I don't see it as a board.

[Phil Nelson]

Under. Note the yellow and orange caps in this photo of my CTC-7:



The pile of "brown drops" and one bumblebee show what I replaced.

The full CTC-7 restoration article is at http://antiqueradio.org/RCACTC-7ColorTelevision.htm .

Phil Nelson

[SwizzyMan]

Basically all the brown drops? Some of them are just buried in there. By the way a big thanks to you Phil for helping me out.

[Phil Nelson]

I believe I replaced all of them. The failure rate of those on the boards was so high that I couldn't justify keeping that type of cap anywhere in the TV.

I recommend trying out the TV frequently as you recap, rather than replacing all of 'em at once. If you make a wiring mistake or install the wrong value cap, which is easy to do, the problem will be immediately obvious and you won't have to go nuts trying to find the error amongst two dozen replacements.

Regards,

Phil Nelson

[old_coot88]

At noob-level experience, it'd probably be advisable to power-up after each part is replaced (IMHO).

[SwizzyMan]

Well going to need more caps I guess.

[SwizzyMan]

Diddle sticks got here today. The smell terrible but everything is here. I will start to recap the chroma circuit later tonight.

[SwizzyMan]

OK just finished recapping the entire chassis with the exception of two caps.

[SwizzyMan]

OK horizontal lock is once again horrendously bad goes off sync in less than 30 seconds does this on the bt modulator the lcg-400 and the converter box. Also no color still but a slight rolling rainbow that isnt rolling at all.I did not replace one electrolytic cap located in the chroma since I don't have that value could that be screwing things up? Tried adjusting the 3.58mhz oscillator coil that yielded nothing. I am pretty frustrated as to why the horizontal hold is so bad and why I still have no color. ugh

[DaveWM]

pointless to worry about color until the horz is solid, with out a good horz the burst gate will not work.

[SwizzyMan]

well I'm at a loss to what could be causing it. The chassis is recapped and the horizontal board is recapped. Could a coil need to be adjusted or something?

[DaveWM]

could be sync could be the osc. Need to know which to know where to start.

[SwizzyMan]

Are those coils? Or circuits?