SO ARE YOU SAYING, IF HE IS NOT USING HIS SET DURING A PULSE (ooopppsss!) ...it will no longer work? Or is it the tubes that are not susceptible?
STOP THE DIRECTION WE ARE MOVING NOW.
EMP is the ultimate zot - it induces current between metal bits, which are seperated by even a small distance.
This current tends to fry electronics.
Vacuum tubes are less succeptible to EMP than solid state - but they can still fry, given the right pulse.
So, the answer to your question...”IF HE IS NOT USING HIS SET DURING A PULSE (ooopppsss!) ...it will no longer work?”
...depends on what type of set, and how well he buried it. A faraday cage will work - but then, you cannot broadcast, can you?