CTC 4 service manual on eBay
 

That's a training manual... Kinda rare! I have it already, or I'd bid. Just FYI to anyone bidding: It doesn't include parts lists or a full schematic. It's a school supplement to the service manual.

Charles

whoever wins it should make a pdf of it

Perhaps the one for the 4 is different but
I have one of these for a 7 and it has everything you'd ever need to know about setting it up and servicing it.
(Even so my 7 sits here unfinished :scratch2:)

http://www.vintagetvsets.com/schem/ctc7-small.pdf

I'll take a look again at mine, if yours has a full schematic for the 7, this might also. I remember it having an excellent discussion on theory of operation, and blowups of specific circuits.

Charles