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Audio Examples of Overdrive, Distortion, and Fuzz Pedals

History and Photos of Vintage Fuzz Pedals.

A Musical Distortion Primer (R.G. Keen) Article on the physics of distortion and a round-up of electronic techniques

Guitar Distortion 101  Article on the physics of distortion, relationship of waveforms and harmonics

Amptone.com Website on overdriven guitar amplifier and effects, covering: tone settings, distortion voicing, simulation and modeling, processors, speakers, power-supply modifications, switching and signal routing gear, software and recording, and DIY projects.

AX84 Cooperative, non-profit website offering free schematics and plans to help readers learn to build their own guitar amps.

Fuzz Central Lots of Schematics and Fuzz Pedals

Tons of Tones Technical site with information on distortion stages in Guitar Amplifier Models and Effect boxes