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Hold up on the caps, unless they are wax paper types there is a good chance they are fine. I love the handwire chassis of the zeniths, BUT there is a lot of stuff under there, layers at times. I prefer PCB's to work on for that reason alone, a lot easier to lift a leg and check a cap. The problem with shotgunning caps is you may introduce a problem esp with handwired chassis.
Watch out for any parts that are connected to coils, I pig tail new parts there to avoid stressing out the coil with heat and movement needed to remove the old part.
My recommendation would be to check the few HV tube caps, prob in a white tube, with a good HV cap tester (check for leakage under load) or just go ahead and replace those prob only a few, like in the vert circuit, maybe around the crt screens. Replace any paper caps (if it has them). Check small eletrolytics. check the can caps for shorts (lately I have had good luck on them being just fine).
then fire up again this time monitor the B+ for current, and pull the HOT and VOT tubes out. the current should be low since those draw a lot.
if all goes well then try again with the tube in, monitor the B+ and watch to see if it goes high as those tube start to conduct.
Prob would not hurt to check the Horz tubes and HV for shorts if you have a tube tester.
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