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#31
04-23-2015, 08:56 AM
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Ah! Makes sense on the transformer wire. Line voltage here is 117, so I'll just tape it back off.
I'd assume the cap's bad. As per the video I posted on page 1, it had shrunken and oscillating vertical sweep. Figured I'd just do all of the filters in one fell swoop.
__________________
"Restoring a tube TV is like going to war. A color one is like a land war in Asia." 
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#32
04-23-2015, 09:20 AM
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Quote:
looking forward to seeing it going 
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#33
04-23-2015, 11:54 AM
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Two steps forward, one step back
 Slow powerup on the variac, and while the guns were WAY off, I had a full raster and all colors! The tuner was dirty, forgot I had to clean it, so I'm screwing with that and doing a crosshatch to get it roughed in, and then I realize that I lost color. Dammit! Or, rather, everything but green and a pinkish red. This pic doesn't show it clearly, but this is what I've got now. Snow on the off channels is white with confetti, but that's to be expected. Still, progress is progress
__________________
"Restoring a tube TV is like going to war. A color one is like a land war in Asia."
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#34
04-23-2015, 01:06 PM
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check the jumper wires on the chroma board, of just feel the power resistors that feed the plates of the diff amps, my guess is the wires are broken, common problem on CTC-12 thru 17 at least
see here at 5:22 https://www.youtube.com/watch?v=YJ1JWdn_kTw oh and that set had the short vert too, turned out to be the 100k boost resistor. Last edited by DaveWM; 04-23-2015 at 01:12 PM.
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#35
04-23-2015, 03:33 PM
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Son of a GUN. Mine has that SAME SPOT of corrosion on it!
Well, looks like I'm gonna pull the chassis and check all my jumpers! Thanks for the tip!!!
__________________
"Restoring a tube TV is like going to war. A color one is like a land war in Asia."
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#36
04-23-2015, 06:03 PM
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the dead give away is the cold power resistors that stand up there are 3, on on the side of the board, two more center right. 27K wire wounds IIRC. look for crystalized solder around those. The whole pcb is subject to a lot of heat, esp around those 6GC7 tubes and the Video amp 12GH7 or 12BY7. just go easy working on it, those traces will lift. Also reflow the solder stakes that are used for ground if they look suspect at all. lastly check the blanker tube grid resistor to ground trace. Its right on the edge of the pcb that is near the horz out tube. that trace has been known to crack, causes a increase in the blanker tube neg voltage, the effect is two fold, a slightly darker pic (the neg voltage is used in the brightness circuit) AND on sets later than the CTC-12 its a HV hold down voltage that can upset the bias on the horz out tube (if the trace cracks open the HV and horz sweep will be reduced).
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Linear Mode
