2 ms·Indeed. A few fighter jets still run on vacuum tubes, I believe.by selven 17y agoIndeed. A few fighter jets still run on vacuum tubes, I believe.davidw 17y agoThat's nothing - there are a few Chinese jets left that have a little guy with an abacus crouched in the nose. [ Sorry, couldn't resist, I liked the mental image too much. ]zandorg 17y agoThere's an Asimov story about that too.