So for some reason the local Salvation Army, which has never had a set made before the BPC era before, has this RCA ColorTrak set for the princely sum of 10 dollars. Looking at the label on the back it seems to be from 1978, which would make it the oldest set I own if I get it.
https://i.imgur.com/CBd8Fg3.jpg
https://i.imgur.com/zmwGbNH.jpg
My main questions are...is it worth 10 dollars, for one, and also how does the channel changing work with only one knob? Any other info about this set would be appreciated as well.