Rca ctc-5

[DaveWM]

a ha!

while checking the convergence coils out (all good) at the male convergence pins, I next check started to check the female pin on the chassis, 1st up was the ground... hmm no ground to chassis, pull the chassis back a bit, got the flashlight out, whats this the ground buss is clipped! no ground for the convergence coils, well gee no wonder they did not seem to be working (at least the dynamic) Not sure why that would have been clipped, I know I would not of done it since it was just a ground to a connector that would have been unplugged so no need to clip it out. Taking a break know but hope to report back soon...

[mstaton]

Sometimes it's a simple cure. Glad you found it.

[DaveWM]

hopefully that will make it work, while I had the chassis out I replaced the old .0039/68ohm fix done some time ago. figured I may as well replace that cap as well. I checked to see if the 330pf had been changed to the 390pf per the fix but that was not done. I assume its some kind of improvement on video response, but as I did not happen to have a 390pf on hand I left it alone.

[DaveWM]

oh and the 22pf C66 on the article is still there (plate to cathode), so it looks like they only did the cathode bypass change from the cathode to the contrast pot and electrolytic.

[DaveWM]

At 1st it seemed a LOT worse, poor color (weak) lousy convergence even in static, then I decided to check the purity, cut off G and B put on a blank channel, big green blob in the middle, wow was it jacked up. I did a quick purity correction got it better and then back to the channel. color back strong, and convergence seems a lot better, but I am getting tired so time to quit.

[DaveWM]

just keeps getting better, but now I think I am getting a weak RF tube, starting to get some snow. Anyway while adj the focus why not just grab the focus pot shaft plastic piece rather than fooling with a screw driver......zapppp.... ok not such a bright idea will not be doing that again.

[DaveWM]

convergence is tricky, the static adj are very touchy right around the correct spot, I am guessing a dirty pot but maybe wear. I am able to get it but its tough.

[DaveWM]

geez I am getting tired of this thing, really makes you appreciate the improvements by the time they got to a 9 or 10. I dont know if its the CRT, my convergence, the low CRT anode voltage, my signal, the tuner, it just does not make a very nice pic. It like its all chroma, I am going to have to go back and look at the video board again, make sure there are no open coils etc.... Seem worse now than just a few days ago. and I can't get it to track worth beans, the green highlights always come up too much when the contrast or brightness is turned up. This set has the PM blue lateral, so it has a R background pot. I tried setting it for 90v bias from the K to G1 per the service manual as a starting point. I am tired of fooling with it I think I will stay away from any more 5's...

[DaveWM]

I don't know if this is an issue, but I will check that 82 ohm HOT cathode resistor that is in P with the DC convergence pot. Maybe if its off it will shift the "sweet spot" for center convergence to a less touchy area.

[DaveWM]

whew... got the CRT swapped, wow that was a lot of effort, but its in and looks great. will be much nicer working on it with the better cabinet (the old one was nasty, big time). I removed all the hardware from it and will put it out in the trash. I was tempted to swap the bezel but it was a different color (green on the donor, brown in the wingate). Now I just need to find a good back for it.

[DaveWM]

had this set on the back burner for a while. Needed to clean up and get organized. I have an idea, I have an extra CTC-5 chassis. I am thinking of recapping it, see where I am on it. IF I can get it going, I would like to see about making up a fly from more recent fly by adding my own windings for the secondary windings including the convergence windings. I have some flys that have a lot of extra taps, fly 331 IIRC for an admiral. Would be an interesting project. I would like to scope the working fly (assuming it works) then I could try and match up the donor fly. Its a long shot but if it worked it could help boost the HV up from the low HV from the stock 5, not to mention improve reliability.

I am pretty sure I could just convert to a later model like a 15 for HV with the use of a modern convergence cluster and board, and a new vert out, but I would rather try to at least see if I could make one that is closer to the orig.

[stromberg6]

That would be an interesting project. I have a CTC-5 Special chassis that I "rescued" from a field, but the CRT and associated neck components had been destroyed. The chassis is complete, though, and it will be worth evaluating with the thought of restoration. I only borrowed one resistor from it for my 5N chassis. I'd really like to have working examples of both types of chassis to go with my 4 and 7.
Good luck, and I look forward to know how you progress.
Kevin

[DaveWM]

it will be a while just musing it over. It just seems a shame to have some really nice thordarson flys and not be able to use them. they are monsters compared to the stock flys in the 5.

[DaveWM]

the more I look it over the more I think just using a reg convergence board with static PM would be the way to go. Maybe even able to use the stock vert out trans. The trick would be to make the conversion easy to reverse for the purest collectors out there. Oh well be a while I just boxed up one of my CTC-5 chassis. Still have one more to work on that is a complete set. Its the blonde special (early 5 with the PCB chroma).

[DaveWM]

I found a couple of the 100 ohm tapped pots for the DC convergence, that should make the convergence a bit less jumpy. I will pull the chassis and install them when they get here. Then a full convergence setup, and a flyback cooling fan, using what I learned from the CTC-12 flyback cooling experiment.