The most susceptible devices will be micro circuits, even unplugged or without batteries installed.
Some 'discrete component' devices might survive if not near the EMP source. But even those are vulnerable if they have capacitors or inductors (which most do). I could tell ya more, but then someone would have to shoot me...
This is from memory (which my bride does not trust, so...) based upon my time in USAF Electronic Warfare field back in the '60s/'70s/'80s. And no, I did not stay in a Holiday Inn last night.
By the way, who still has a mechanical clock? Not that you would need due to the chaos!
Some 'discrete component' devices might survive if not near the EMP source. But even those are vulnerable if they have capacitors or inductors (which most do). I could tell ya more, but then someone would have to shoot me...

This is from memory (which my bride does not trust, so...) based upon my time in USAF Electronic Warfare field back in the '60s/'70s/'80s. And no, I did not stay in a Holiday Inn last night.

By the way, who still has a mechanical clock? Not that you would need due to the chaos!