Wow that Zenith has a real strong jug. It will come out real nice.
On that set look at the main choke in the power supply. See if it has a
non polarized electrolytic in series with a resistor. This is in parallel
with the choke. Per Zenith factory its not needed & you can just
snip the cap out.
2nd thing especially on tin can Zenith sets. The ends of the terminal strips go to ground. Sometimes ones in the middle do also. They can break loose &
causes intermintants especially toward the front under the CRT. Even a
hand wired set can get a cold joint !
Let us know how she comes out.
73 Zeno
LFOD !