What about nuclear war or a solar mass ejection event? I'm thinking a big fat EMP will smoke the semiconductors in most amateur rigs: they often have big antennae and sensitive pre-amps.
Is there any RAD-hard amateur gear?
Firstly hams equipped for emergency communications keep backup radios (disconnected from antennas) for this very reason.
And if their gear was damaged by EMP, the hams would have the knowledge to effect repairs, or at least build simple valve based gear by scavenging old TVs, etc.
Again, this is a popular activity at fields days: A race to see which team can first make contact by means of a simple Transceiver built from scavenged junk.
Tube gear is often quite cheap because nowadays everyone wants fancy electronic gear. About 12 years ago I picked up a 70s-vintage Kenwood TS-820S hybrid rig (tube finals, the rest as solid state) for about $150, when a comparable electronic rig would have been about $1k. I abused the crap out of that rig and it took it quite well. I finally need to have it serviced one of these days, the output power was starting to tail off (probably a tube finally giving up its magic blue smoke).
Tube gear has a bit more of a learning curve than solid-state gear (eg tuning up before operating) but it's very durable and easily serviceable. Generally the most you will do is blow a tube whereas with a transistor-based radio you definitely will smoke the semiconductors and the radio will be a write-off. Unfortunately tubes are getting rare/expensive, but it's still better to track down a couple of $25 tubes than to replace the whole rig.
Tube rigs are particularly common in high-power gear (again, especially if you are trying to keep costs down). Solid-state amps in the 1KW range only became feasible relatively recently and are still much more expensive than a tube-based boatanchor. They especially dominate AM/FM broadcast equipment, which can range from tens of KW up to megawatts of power. You just can't push that much power through transistors very easily.