Goodmorning everybody!

[oldtvman]

looks like a demodulator problem, those sets had problems with the chokes in the demod circiut going open, and don't forget that on those old sets one of the first things to do is use a good silicone based controls cleaner and clean all the pots and also the service switch, too many problems seem to be major, but also check the simple stuff first. you may save yourself a lot of headaches.