Quote:
Originally Posted by Electronic M
I got the old silicone off and recoated the fly for the CTC-16 on Saturday. It went well, and aside from the rubber tire being charred/bubbled there were no scorch marks or carbon tracks to be found (the old silicon and fly paper were fine).
    
    
I decided not to smooth it since a rough surface has more surface area, and thus should cool better.
I gave it about 1.5-2 hours run time with the silicone still soft (which cured it nicely), and it ran like a champ the whole time.
Then I got sidetracked till last night upgrading my laptop to Windows 10 (long story).
I gave it another hour and 40 minutes on. No, arcing, no wax ooze, but the fly does get rather warm...I want to try and find some time to put 3-6 continuous hours on it to see how it holds up. When I can I'll get some heat sink compound for the fly to chassis (may also squirt some between the windings and core). I'll also try to add some vent holes and a fan to it, but I gotta figure out where and which fan (the best side to put a decent sized fan is against the side of the cabinet, and not usable).
I worked on the 20 today. I resoldered the busted coax to the color level control, and resoldered the snapped off chroma transformers.....It came on, a moment later I hear a snap and the vertical fills out.  Then I proceed to adjust what I believe is the chroma osc. transformer and start to get color barber-poling.....Then another snap, raster is lost, and smoke from the area of the chroma osc. transformer. I swap the two leads I guessed the connection points to, and try to reassemble it, but the bottom has melted/warped to the point where I'm not sure that transformer is worth fixing anymore....The vertical relapsed to not filling the screen too. That CTC-20 is a real mess.
I think I'll work on something else for an hour or two to get a break from RCA color work. |
I think with the CTC20 it's going to come down to sourcing good replacements for those two transformers... I wish better care had been taken when it was stored disassembled. I like the style, I may wanna buy the set back, so I'd be interested in helping seek the parts.
I'd almost be interested in coming up there and learning from you while you work a little. Learn the basics I'm missing from you, that stumped me so endlessly with the CTC16. How to read and test resistors, check voltages properly, test capacitors.
As for cooling the CTC16's flyback, I was thinking of putting a small, low voltage brushless computer fan on the bottom of the right side of the flybox (Facing it with the back of the set off), blowing in on the transformer, with a vent hole on the top left side to blow the heat out. It would only take a low voltage wall-wart to power a computer fan, which could easily be wired to the TV's cord and switch, so when the set is switched on, the fan powers on. Brushless computer fans are very quiet and move plenty of air. I have several plus several power supplies laying around that'd drive it perfectly.
I'm going out of state in a few days and I'll be gone until December 10th. so while I am gone, feel free to watch and enjoy my CTC16 all you like. Besides the warm flyback, I would certainly call it done.
Windows 10 sucks so far. If you want Windows 7 I have an unlocked installer that I can give you that updates it self and is fully featured. I'm giving you a pretty high end business grade dell laptop as a bonus for all the work you did on the CTC16. it'll have Windows 7 Professional installed on it and I'll include a DVD of the reinstall stuff for you.