My Brand New CTC-7!

[Phil Nelson]

I would definitely not replace everything that you already replaced on the vertical board. If you look at this article, you'll see exactly which caps I replaced on that board, along with the Sams diagram of the board:

http://antiqueradio.org/RCACTC-7ColorTelevision.htm

I basically replaced all of the "maroon drops" as well as any bumblebee caps.

Height and linearity controls work together, and they affect each other somewhat. Try making the picture too large vertically with the height control. Then adjust the linearity control to make the top and bottom squares more equal. Then readjust the height control to make it a little smaller. Then adjust the linearity control again. By going back and forth, making small changes, soon you'll get an idea how these controls affect each other and you should be able to get a screen with normal linearity.

If you still can't get good linearity (and a screen that is filled vertically), then it is time to look at other components in the vertical circuits -- AFTER you double-check all of your replacements on that board to make sure that you didn't accidentally install a cap of the wrong value.

It's possible you'll want to replace more caps on the main chassis, but that's a question for another day. That chassis contains the color circuitry and the gospel is that you worry about color AFTER you have obtained a normal black and white picture.

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

[SwizzyMan]

Originally Posted by Phil Nelson

I would definitely not replace everything that you already replaced on the vertical board. If you look at this article, you'll see exactly which caps I replaced on that board, along with the Sams diagram of the board:

http://antiqueradio.org/RCACTC-7ColorTelevision.htm

I basically replaced all of the "maroon drops" as well as any bumblebee caps.

Height and linearity controls work together, and they affect each other somewhat. Try making the picture too large vertically with the height control. Then adjust the linearity control to make the top and bottom squares more equal. Then readjust the height control to make it a little smaller. Then adjust the linearity control again. By going back and forth, making small changes, soon you'll get an idea how these controls affect each other and you should be able to get a screen with normal linearity.

If you still can't get good linearity (and a screen that is filled vertically), then it is time to look at other components in the vertical circuits -- AFTER you double-check all of your replacements on that board to make sure that you didn't accidentally install a cap of the wrong value.

It's possible you'll want to replace more caps on the main chassis, but that's a question for another day. That chassis contains the color circuitry and the gospel is that you worry about color AFTER you have obtained a normal black and white picture.

Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html

I did what you did I replaced all the maroon drops and one high voltage cap.

[SwizzyMan]

Turned it on again this morning and was preparing to follow Phil's instructions when I heard a loud Pop! My guess is it was either a cap,a resistor,or the piece of foil I used to make one end of the fuse make contact with the metal contact. Nothing was affected by it it seems. No loss of HV no loss of picture no loss of the already garbage horizontal hold. But of course I immediately pulled the plug. Should I take the chassis back out and inspect or should I continue considering nothing seemed to be damaged?

[SwizzyMan]

No matter what I do I cant get the screen to fill completely with the height control and I cant get anything symmetrical with the linearity adjustment. I am confused as to how they work together because Ive tried everything.

[DaveWM]

check the resistors I mentioned.
check pin voltages of vert tubes.

[SwizzyMan]

Originally Posted by DaveWM

check the resistors I mentioned.
check pin voltages of vert tubes.

Alright will do... The horizontal hold is so incredibly bad. What should I check in that section?

[SwizzyMan]

Getting about 1.48 megs on the 1 meg resistor