References, links and resources for the technically inclined

schematic diagram

Electronics Theory

Ohm’s Law
about electronic components
basic electronics online book
analog electronic theory
resistor color codes
electronic calculators for everything
how to make PC boards
guide to tube circuit analysis and design

DIY Projects

Gyraf Audio
DIY Factory
Seventh Circle Audio
Allen Amplification
Metropoulos Amplification
Weber Amplifier Kits
AMZ Effects Projects
Build Your Own Clone
Tonepad.com

Part Sources

Mouser
Digi-Key
Allied
Newark
Jameco
Tube Depot
The Tube Store
Mojo Musical Supply
Goldpoint Level Controls
Sowter Audio Transformers

Community Forums

Pro Sound Web
Gearslutz
Prodigy Pro DIY
diyAudio
Sound On Sound
Recording Consoles of the 20th Century