Walter,
I was in touch w/Jamie earlier today before he turned the 21-CT-55 over to you. I had sent him a link to the SAMS. Here it is just in case you didn't get it.
http://www.earlytelevision.org/pdf/R...Sams-300-8.pdf. Best w/ this project. Be very careful powering it up. Don't want to damage any unobtainable parts. Also, this is the only ad for your set I have ever come across:
http://www.earlytelevision.org/pdf/rca_21ct55_ad.pdf
-Steve D.