Microchips are most sensitive to EMP, because they are very tiny transistors packed tight on a silicon substrate.
Waaay back in 1975, Soviet pilot Victor Belenko defected to the US, by way of Japan, in his Mig-25. The Mig 25 was a hot-rod interceptor, basically two massive Turmanski turbojet engines with wings that could push it to Mach 3 for limited periods. The West was desperate to get ahold of one, and Belenko provided them with that chance. They discovered that it's computer system was composed of vacuum tubes, and the West laughed it off. Then they realised that vacuum tubes are fairly immune to EMP, and didn't laugh.
The Soviets stated it was to enable the radar to burn through any jamming directed at it, but it had the added benefit of being EMP hardened.
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The party's over ... the drink ... and the luck ... ran out.
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