Restore 21CT55 to schematic or as built?

[Zenith6S321]

That all sounds like very good advice guys.

Phil, thank you very much for your excellent web site covering the CT100 and your restoration. I also had problems with intermittant loss of color synch in this CTC2B chassis, some 20+ years ago. Now that I can afford the proper test equipment I look forward to trying to track it down. Although the set displayed a very nice picture when last turned on 15+ years ago, it required lots of tweaking as it operated. The 21AXP22A and the flyback were replaced by the previous owner (TV repair shop manager).

Andy, Steve and Reeferman, thanks for the warning about Sams accuracy. At the least I will update my Sams schematic as I recap and verify resistances and check the coils for continuity (maybe I will also try to find an inductance meter).

Steve, I have searched the web for a copy of the RCA service manual/schematics to no avail (except for Sams). It would be very helpful if I could get a copy of any information you would be willing to share!