ETF has one on their site, but beware- there are 2 different circuits. I believe the one at ETF is what I have in my RCA manual as a 'late production' chassis, which there is another one for the earlies. I was able to tell because the lates have a single cap for the CRT screens, while early has individual .082's for each screen.
http://www.mcmlv.org/Archive/Radio/CTC4.pdf