The targeting computer was analog, and controlled a very large anti aircraft gun using radar to to automatically track targets and compute parabolas. The gunner sat in a little control seat on the turret.
When a tube blew, the whole turret would start oscillating violently. The job of our guide was to pull refrigerator-sized banks of vacuum tubes out of the wall, replace all the ones that looked dim, slam it shut, and move from bank to bank until it stopped trying to shake the poor gunner out of his seat.
The shells had a timer inside them, and the people loading it had to set the delay between launch and detonation based on the time of flight the computer reported. The timer was actuated when the rifling of the barrel spun the shell as it was fired, so this was as precise as the clockwork in the shell allowed.
Apparently, they shot down a lot of planes with that thing.
Aside from the constant adjustments required to keep them accurate (analog computation requires precision!), they're amazing solutions.
E.g. look at the barrel cam at 10:13 for calculating super-elevation required to hit a flying target