In audio design, we all "stand on the shoulders of giants". Some of them I had the privilege to interview. But there are many, many people who do interesting things in audio and document their adventures on their websites. And oh yes, the * indicates they have written for Linear Audio.
Walt Jung has reorganised his website in 2014 and now hold a very large collection of historical articles and documents. Many come from the pages of Audio Amatuer and it's siblings, spanning several decades.
You do need to register (he gets a lot of spam apparently) but that's well worth it - bookmark that site! The new name is now Walts' Blog.
For those of you who are interested in tube equipment and the recent history thereof, Vacuum Tube Valley magazine is a rich source. Thanks to Robert Schuelke for bringing this to my attention.
Another large source of articles from Wireless World, not only audio but basically the whole contents of historical journal. Compiled by Keith Snook.
Combine the above link with Douglas Self's* collection who documents not only his own audio adventures but also many articles and developments by others; a very extensive audio tech history repository: http://www.douglas-self.com/
John Broskie's place for anything tube: www.tubecad.com
Stuart Yaniger*'s place, who's interests are very much my own. And he writes a mean book review for Linear Audio: http://www.syclotron.com/
Bob Cordell*, who earned his stripes in both amplifier design as well as speaker design and special-purpose test equipment design: www.cordellaudio.com
Rod Elliott also has done many different things in audio, and has a knack of explaining things very clearly and succinctly: http://sound.westhost.com/
Nelson Pass*, a man who really made it in audio yet never lost the 'teenager wonder' (his own words) for audio, has a separate site for audio do-it-yourself: http://www.passdiy.com/
Then of course, the world's largest, most varied and sometimes overwhelming: www.diyaudio.com - every subject, every level, facts and figures and plain bullshit - in other words, just like the real world!
Siegfried Linkwitz wrote to KEF in 1974(!): "This will be the end of my involvement in speaker design" - yeah sure! Championing dipolar speakers with controlled directivety and thus controlled reflections. Worth a browse.
A very prolific designer who produces a constant stream of unusual but very useful pieces of audio equipment and test equipment: Pete Millet's audio pages also has lots of tube data sheets and assorted facts and figures, and is a gateway to info on books and transformers.
Finally, if you're even a bit like me, you've probably be in a situation at one time or another that you really think you've discovered something New and a Breakthrough. I've been wrong everytime, but maybe you do better. To save you a lot of time, money and aggravation, read The Alternative-Science Respectability Checklist! Really. Do it.