Here's a 13" RCA that was given to me today. Despite the fact that it's been in an accident, is nearly 30 years old, and appears to have never had it's back taken off; it still works fine and produces a nice picture. All I need to do is clean the controls.
This TV uses a CTC123 chassis; which, I've never seen. All of the 13" RCA's that I've worked on from this time period all had the same basic chassis as the larger portables & consoles (the chassis with the large filter cap mounted on the rear heatsink).
Here's a video I made of the TV:
http://www.youtube.com/watch?v=EeqSonX2f1U