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I have also restored 4 CT-100s and a couple of 21CT55s, and have never replaced the filament windings. I've also kept the original seleniums in every one of the sets. I think these sets were operated for so few hours that the seleniums are still good.
I did add additional fusing - especially in the cathode of the horizontal output tube. However, I have never had a flyback failure, so I think they are pretty tough.
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