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Same here on zenith filter caps, more likely than not they are fine. I have worked on several zeniths from the early to late 1960's so far only one was a problem and it was open (the pincushion correction on a 23x). Not only have the cans been ok, but to my surprize even the singles have tested well. I use my cap tester on them to test at rated voltage for open and leakage, so far they test every bit as well as new caps! So I have revised my thinking these days to check them, if they test like new I leave them be. I do like to add fuses to the B+ and HOT, the B+ fuse will cover the PT and the HOT will cover the fly if the horz osc decides to stop. The HOT fuse is a little tricky, CTC-17 has done some testing and a reg fuse does not seem to work properlyt here, a chem fuse would be the way to go.
Prob the best advise would be to check the HOT current and work on it if too high. Also you can prolong the sets life by reducing the line voltage, this will take a large load off. the set should work fine at 110vac, around here its often at 125vac. I have not done it yet but a adj to the HOT screen value would prob be the best way to address the higher line voltage put out today
I would recommend ALWAYs changing the coupling cap to the HOT, esp if its a brown/maroon drop. Also the 1kv hard covered (white tube) foil caps that are generally found in the vertitcal circuit. Those seem to be bad about 50% ot the time (leaky) you will know if the picture seems to be jumpy vertically.
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