DIY Audio Projects has a selection of build-it-yourself tube amps, tube preamps, speakers and subwoofers, all using really cheap parts. If you’ve ever fancied constructing audio gear, this could be a good place to start. Via MAKE:blog and CDM’s designer onetonnemusic. We’ve covered DIY stuff before, but if you have your own resource for schematics and the lot, hit us up in comments.