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"... is tube tech more susceptible to RFI? Or solid state less, or a combo of both?"
If it is radiated RFI, sets with 300 ohm twin lead feeding the tuner will be more susceptible than sets that are 75 ohm coax all the way. Beyond that, it depends on a lot of little tuner design differences that could go either way.
If it is conducted RFI, it all depends on individual chassis design, old or new. This can be reduced with an AC line filter.
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