Tubes that perform at 9v power supply?

[Dai H.]

this site has some info on wiring, tubes, etc., etc.

http://www.tpub.com/content/neets/

re: safety: it's good to have a healthy fear of high voltages, getting injured, etc., but don't let  it stop you from getting into tube circuits. When you cook, you deal w/the potentially dangerous, like fire and high heat, very sharp knives, hot oil, etc. etc., but that doesn't stop people from cooking, right? I can't think of any specifc sites having to do w/safety when working on tube equipment, but if you try googling (try searching out tube DIY for hi-fi sites also), you should come up w/something. In general though, stuff connected to the wall needs to be taken much more seriously than say, a Fuzz Face powered by a 9V battery though.