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Very easy if the tube is or is used as a diode. I had a 30s admiral that used a type 76 triode as a detector diode and someone in the 50s wired in an early 1N34 or 1N60 as a replacement.
I know people have made SS replacements for the 1L6 and the 6U5 (the 6U5 replacement is pure blasphemy in my book).
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