Attempting first project - Some questions if I may

[zeno]

First thing is change the caps ONE AT A TIME ! Then recheck the
set & see if anything changed.

1) those NOS cans are OLD ! By the 70's they packaged them in just
plastic, not boxes. Since the set is running you may want to do them
last in this case.
2) it may be a subbed cap & there is another one hung in under there somewhere.
3) most Zeniths twisted 2 of the lugs & soldered the other 2 so breaking
off the twisted ones it will come out easy. You may need a very hot
iron such as the old classic Weller gun.
4) The CRT wasnt grounding good. Someone moused it to get by.
The GND is made either with a set of finger or a coil spring on the bottom.
Some use a very long, small spring across the DAG. If the DAG is chipping
off it can be replaced. Symptom are diagonal dots in pix, bad sync, sometimes hissing, sparkles & ozone smell. Can also radiate & bother other TV's radios etc.
5) not sure what you mean here.

Safety ! The most dangerous place is where the AC comes in. I never
heard of a tech dying from a TV HV shock. I got them once a week for
40 yrs. The filter cans in most sets will bleed off fast. The HV will stay
charged a LONG time with a tube rectifier. Avoid the base of the HV
rect tube & anode lead. If you discharge it it can build back up to a
lower level so discharge several times over a few minutes.

BTW Put up a few under chassis & chassis pixs & chassis ##

73 Zeno
LFOD !