Sound Practices Magazine
Sound Practices magazine was at the forefront of the DIY market in the early nineties, published in Austin, USA it had a huge following and a great deal can be learnt form them now. It was created to "encourage audio experimentation and to promote the exchange of related information." With a heavy bent to valve hi-fi, horns & circuit diagrams galore SP is an excellent resource for home constructors. Although we have sold out of a lot of our hard copy issues. The whole collection is available in PDF format in the CD ROM.