If they truly work OK now, new tubes probably won't do a thing. The
only tube that might be of some interest would be the first RF amplifier
in the circuit and even that is only a remote possibility. When the
opportunity arises, and you have access to a good tube tester, have a
look at the tubes. Then you can make a value judgment as to what might
help.

Count Floyd wrote:

I have an S-38 and a Lafayette HE-10. They work OK, and have been
recapped and restored, but would all new tubes help? The tubes are
all original in the HE-10 and some have been replaced in the S-38.
Just wondering if it is worth it to buy all new tubes to go along with
the recapping.