Rca Ctc-11 - Videokarma.org TV - Video

HowardBanjo · #1 09-25-2008, 03:12 PM

Hello, I'm new to this board so I'm still learning. I have an RCA CTC-11 that has worked well for years with small fixes (replace a tube here and there). Now It's starting to need some caps, etc. And I'd like to replace the flyback. There are some very knowledgable folks here. So if anybody has any service information about the CTC-11 or a source of parts that would really help. Also, any troubleshooting pointers would be great. For a long time it has needed about 15 minutes to get up to full brightness. Any thoughts?

Thanks, Dave

gadget73 · #2 09-25-2008, 03:43 PM

Could be the HV rectifier is getting tired, or possibly even the picture tube. Weak video output tube might also cause that. I've never worked on a color set, so there might be other issues. Bad caps are to blame for a lot of things, and if this particular unit uses a voltage doubler arrangement for B+, bad caps in that circuit could cause weak B+.

I'm told that Moyer Electronics is the place to go for flybacks and other oddball parts. http://www.moyerelectronics.com/

HowardBanjo · #3 09-25-2008, 03:45 PM

I think I've found how to attach pictures. Here's one I just took. Not too good, but you can see it anyway.

*zenithfan1* · #4 09-25-2008, 04:49 PM

Wow! That is a nice looking set. I don't get to see many 11s.

Tony V · #5 09-25-2008, 05:45 PM

It looks like you either have a weak green gun in your crt or your grey scale adjustment is way off for starters. Nice looking set though and overall looks like its playing decently. It wouldnt take too much to get this one playing like the others on the forum here.
-Tony

mattcarranza · #6 09-25-2008, 06:29 PM

Quote:

Originally Posted by HowardBanjo

I think I've found how to attach pictures. Here's one I just took. Not too good, but you can see it anyway.

That is a very cool set! By the way, is that a console in the bottom left corner of your photo?

I remember being a small child (in the 80's) and remember my grandpartents had what i now can identify simply as a zenith roundie. I remember thinking it was way cooler than my parents TV. I dont recall much about it. Ill ask my grandfather what ever happened to it.

Sandy G · #7 09-25-2008, 06:31 PM

Don't listen to 'em. Yr TV is JUNQUE, about ready to die. It CANNOT be fixed, as that particular model is COMPLETELY made up of Unobtanium parts. Yr best bet would be to ship it to me, prepaid, of course, & I will give it a good decent Christian burial....(Mbwahahahahaha...Maybe THIS will be the one who believes me....)-Unca Sandy, Under the Bridge, Hawkins Co. Tennessee, 37857

julianburke · #8 09-25-2008, 06:57 PM

When it takes time to get a good picture or brightness, most likely your picture tube (CRT) is weak. A simple setup may make it look better but a weak CRT is what you probably have. What makes you think it needs a flyback or want to replace it? Flyback looks like it is doing its' job to me.

HowardBanjo · #9 09-25-2008, 07:10 PM

Thanks for all the responses. The Flyback has some "melting" and some HV leaking when the screen goes from light to dark or when I turn down the brightness control. Actually I think all the guns are good--that picture just had too much red in it because of what happened to be on the screen at that moment. I just figured that replacing the flyback would be a good thing. But mostly I need to replace some caps on the vertical board and I figured I should do other stuff while I can. Here's a better screen shot. Thanks again for everyone's help.

*zenithfan1* · #10 09-25-2008, 07:37 PM

That tube does look good, that thing really has a good picture. Where do I get one of them there 11s.....

wcarroll · #11 09-25-2008, 08:05 PM

Welcome to the CTC-11 club! Here's some pics of mine. I think it's pretty common to see some melting at the flyback.

zenith2134 · #12 09-25-2008, 08:06 PM

Nice screenshots! And I like seeing a tube Fisher on top of an old RCA set. Perfect combo.

jpdylon · #13 09-25-2008, 11:32 PM

Having it take awhile to come up to full brightness is almost always a condition of a tired CRT. It can also be a weak video output tube or failing power supply capacitor. Look for ripple in the picture (a weave, almost like the picture is "breathing") That is a good indicator of failing power supply caps.

The 11s really do put out a good picture. I have two of them. It is OK to see a little melted wax near the flyback over the life of the set. Just check to make sure the flyback isn't runing hot. Check the cathode current of the horizontal output tube. If its too high, the flyback will overheat.

If you don't have test instruments the best test is to cold start the set at room temperature and run it for 5 minutes. Then shut down, unplug, open the HV cage and feel the body of the flyback. If its cold or at room temperature then all is well. If its warm or hot then you need to check the horizontal output tube and readjust the Ho cathode current.

freakaftr8 · #14 09-26-2008, 11:27 AM

Agreed, check tubes! Video output and HV rectifier could be your culprit.

bgadow · #15 09-26-2008, 12:21 PM

Welcome, Howard! I've got an -11, too. Mine has a crt on the weak side but after some time it wakes up nice. I have not been in the habit of adjusting the cathode current but I am changing that. You should learn how to do that if you haven't already. I wouldn't want to go through the trouble of changing a flyback if I didn't have to; It's not a bad idea to have a spare since they're getting rare.