Visit the schematic vault to access my collection of hundreds of pro audio schematics, manuals and reference materials. It is a searchable library, all downloadable, muti-page pdf’s of vintage and modern recording equipment. From the studio classics like Neve, Urie, and API to the rarest of the rare, hopefully you’ll find what you’re looking for.
Wonderful electronics resource!
about electronic components
basic electronics online book
analog electronic theory
electronic calculators for everything
how to make PC boards
guide to tube circuit analysis and design