Oh yes, my first post! It is worth saying that Swapfest, a giant swap-meet near MIT that funds MITERS, is a very dangerous place for tech-people like me. I saw a vaccum tube, I bought a vaccum tube. That pile of lovely insanity is an audio amplifier using said vaccum tube, made in about 3 hours. It features insanely-oversized caps to eliminate 60hz buzz, and a vaccum tube that glows red when I push it.