Quote:
Originally Posted by julianburke
Damper tubes were a common failure in Zenith sets. A quick check for a damper tube is to slightly remove it from its' socket while the set is on and if the pins arc to the socket, it is conducting and should work in the circuit. They can also arc internally when bumped and should be replaced if they show these signs.
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The damper tube was arcing internally. There were a couple of occasions where after tapping the tube I could get the set to work but not for long. I suspect the tube shorted somehow. The elements appear to be close together in these tubes anyway. I'll order replacements for the damper and horizontal output and see where I go from there. I do think that will fix it though.