[Chas]

Almost think something is loose or touching. Any thoughts?

Yes, include solder blobs, wire snips, poor contacts on the tube/vibrator sockets, component wires touching. Using modern (smaller) components, the leads will be much longer as the body is shorter. The use of insulated sleeving is a must. If no sleeving is available ,solid wire can be stripped of its PVC covering and used for sleeving. Not all PVC is happy with the heat of soldering and will flow at curves or shrink a bit, oops... New components on long leads in an auto radio should have the body of the component tacked to the chassis with electronic grade silicone. Vibration of a vehicle will work harden the lead wires and break the leads. The use of a "Popsicle" stick or a wooden dowel that can be used as an insulated probe to poke at the circuits will often disclose a fault. Heat from a small nozzle heat gun or a freeze spray can also help narrow the area of the issue. So will determining if it is audio, IF or RF or power supply.


Chas