If it has varactor tuners they were known for bad conections in
control assy & a coil near the flyback IIRC.
If an old style tuner probably the RF amp is bad. Could also be so dirty it wont work. Also be sure its getting B+ either 12 or 24V to the tuner.
BUT WAIT !! do you have actual audio or just the off channel
waterfall sound ???
Let us know & also the type of tuners it uses.
73 Zeno
