People may have different views on replacing the mylar "maroon drop" caps in these sets. My first CTC-11 (I have two) seemed to work well after replacing only electrolytics. It started to sag after a couple of years. Going back in and replacing the maroon drops (esp. on the sweep boards) made a world of difference.
When I later did my CTC-7, I showed the maroon drops no mercy. Life is too short to keep re-restoring a TV every time another marginal part fades out. Simpler to do a thorough job on the first go-round. I might feel more sentimental about originality if this were some precious early prototype, etc., but CTC-11 does not fall in that category.
Just my $0.02.
Phil Nelson
Phil's Old Radios
http://antiqueradio.org/index.html