And it's a vacuum tube. How does nothing weigh this much?!

Plasma screens weren't much better, at first. I had a 30" one circa 2006, maybe three inches thick, and it you'd swear it was solid metal. A decade later we bought a couple 32" LCD TVs, then a few more because they were so cheap, and the later ones weighed next to nothing. Nowadays - well, I walked this 55" up and down a flight of stairs by myself, and the only hard parts were finding somewhere to grab and not bonking any walls.