My Brand New CTC-7!

[SwizzyMan]

Originally Posted by DaveWM

def do NOT replace everything on the vert board until you have tried the adjustments AND tube swapping.

Yes you may need to replace some parts, but best to do one thing at a time with starting with the least invasive.

If that does not work then you want to look at the type of cap, not all are prone to failure. Resistors have to be way off before you start getting issues. I rarely find them to be the issue EXCEPT the plate load resistor that are connected to the boost voltage in the vert. since this is your 1st set IF it comes to that, you should only replace one or two parts at a time.

well I did replace all the browndrops and one HV cap on the vert and I replaced both 6aq5a's with their military counterpart 9005. But it was a lot worse before I recapped.

[SwizzyMan]

Messed with the linearity and centering and this is what I got http://i.imgur.com/ydnXUyy.jpg

[DaveWM]

linearity still way off. did you work both the height and lin controls, they work together. this is not digital style adjustments, you have to work them both and they interact. My guess is your are running out of height and trying to fill the screen with linearity.

[DaveWM]

if you seem to lack vert height, check for a 1 meg resistor on the vert height control pot. this should go from there to the boost supply.

look for a 1.8 meg resistor on the vert PCB, both this and the 1.0 meg can be checked in circuit (they are isolated by caps or tubes).

I don't recall but see if there is a paper cap .047 off the 10k resistor from the BB term of the fly (should be on the bottom of the chassis). check that resistor and replace that cap if its a paper. If its a disk its prob ok.

[SwizzyMan]

Originally Posted by DaveWM

if you seem to lack vert height, check for a 1 meg resistor on the vert height control pot. this should go from there to the boost supply.

look for a 1.8 meg resistor on the vert PCB, both this and the 1.0 meg can be checked in circuit (they are isolated by caps or tubes).

I don't recall but see if there is a paper cap .047 off the 10k resistor from the BB term of the fly (should be on the bottom of the chassis). check that resistor and replace that cap if its a paper. If its a disk its prob ok.

Will take it back out tomorrow and poke around some more.

[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]

Originally Posted by DaveWM

if you seem to lack vert height, check for a 1 meg resistor on the vert height control pot. this should go from there to the boost supply.

look for a 1.8 meg resistor on the vert PCB, both this and the 1.0 meg can be checked in circuit (they are isolated by caps or tubes).

I don't recall but see if there is a paper cap .047 off the 10k resistor from the BB term of the fly (should be on the bottom of the chassis). check that resistor and replace that cap if its a paper. If its a disk its prob ok.

The .047 is coming off the vert height pot and is a browndrop

[DaveWM]

check the 1.0meg and the 1.8meg read back values. If it was mine I would prob replace the .047 cap (boost filter) just to protect the flyback. I would use a 1kv while as was at it.

[SwizzyMan]

Originally Posted by DaveWM

linearity still way off. did you work both the height and lin controls, they work together. this is not digital style adjustments, you have to work them both and they interact. My guess is your are running out of height and trying to fill the screen with linearity.

Yeah I'm pretty clueless right now