I have a 25" Sharp TV, CRT, that often loses its picture, but never
the sound. * (Other than that, the picture and sound are very good.
It's analog and I only use channel 3 and a separate tuner.)

TV tuner?
So is that tuner putting out TV signal on channel 3? Or is it putting
out separate audio and video (more likely)? Is there more than one
connection between the two?
Audio tuner and separate audio sound system?