Sometimes modern digital electronics don't have the right feel. There are quite a lot of folks out there building valve (tube) based hi-fi and some have even rebuilt early valve based computers. Mostly I just tinker with stuff.
Retro video game - Resurrecting Tennis for Two, a video game from 1958 I wonder what I could build using magic-eye tubes rather than a CRT? Or maybe I could build a video game for a 405 line TV.
Early valve amplifier designs can use a lot of valves for very little output power, so they're not very economical.
For later, cheaper, (including single-ended) designs see
Push-pull Mazda Pen 45 - Building a Quality Amplifier
Restoring a Mullard five-ten - Mullard five-ten, 5-10, 510
Rebuilding a Mullard 3-3 - Mullard three-three
Cheap valve (tube) amplifier - bluetube
Stereo amp using metal valves - 6F6 stereo
Mini stereo amp using EL821 - EL821 stereo
There are all sorts of interesting items to collect. Rather than build a huge collection of wireless sets, or valves, or test meters, or whatever; I've decided to simply keep a variety of things because each of them pleases me in some way. I'm particularly fond of items that have been built by, or used by, past enthusiasts (a.k.a. makers).
Vintage Electronics >