[blincoln]

I can't provide a citation, but a few months ago I spoke with a retired EE who had specialized in large-scale/high-power systems[1], and he believed that tube electronics would better resist an EMP. i.e. if that belief is incorrect, it's something even experts in the field believe.

[1] one of his example projects was city-block-sized capacitor arrays that can temporarily provide power to an entire city.