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Yep   Transistors are high current low voltage devices and are more prone to damage from Emp  Valves are high volt low current

 Remember back in the 80s when that Russian fighter Jock landed his Mig in Japan and defected.

 The experts where all over the aircraft, and at first declared it a piece of outdated junk using 50 year old valve tech.

Then some bright lad worked out that  the aircraft would keep working after an EMP and western aircraft would fall out of the sky.!!! Some very red faces in the defense department.