That was my 1st scope, 30-35 years ago. Paid $10 at local flea market. Still got it, just to remember how I got started. It's a horrible, low bandwidth, recurrent trace (no triggered sweep) scope that was basically obsolete when I got mine. Perhaps neat to play with, but not useful.
For under $50 you should be able to find a solid state, dual trace scope with at least 20Mhz bandwidth and triggered sweep. In working order as well, hopefully with at least 1 probe. Walk away from the RCA, even if you can get it for $5.
Ed