Here's the full set of photos from the interview with the legendary Kearney Barton in print version of Tape Op issue 83. Also, the University of Washington now has an extensive searchable archive of Kearney's massive analog reel-to-reel archive that is available to the public.
Let's DIY | No. 30
Build a tube Mic Pre: Build Your Own Two Channel Vacuum Tube Mic Preamp!
by Scott Hampton
When asked to come up with a "do it yourself" tube mic pre project, I thought long and hard about what topology to go with. I designed a number of different hybrid tube/discrete class A designs...