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every ctc-12 thru at least ctc-17 that I have worked on had failing caps on the diff amp couplers (.01) at least the one that sits right between one of the 6GU7's and a power resistor. I think its the heat from those two things. Lots of time the pcb has crystalized looking solder on the bottoms as well.
The other thing is the zeniths seem to have less flyback failures, I think the vert outs are about the same for rca and zenith, with maybe a few more in the zeniths. This is from what I have seen and that is not a lot so I could be off on the stats.
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