I have Keystone Bullet TT. It has a Jensen radio and tv. In the past I have used the speakers for the TV. For the life of me I cannot remember how we did it. Just turned 80 that may be the problem HEH...
Congrats on turning 80, many don't make it that far. While I'm far from 80, I'm no electronics wizard either! I think if your radio plays DVDs, it then uses the tv screen, but radio speakers. Just the tv operating, may only allow the sound through the tv speaker.