Tools · Free
Tone Stack Lab
Turn a real amp's tone controls and watch the frequency response move — then hear it. 55 component-value presets across 15 circuit families.
Tube amps · Pedals · Signal flow · Real bench work
An unreasonable amount of bench work — amp repair, biasing math, pedal design — written down properly. Plus free interactive tools that put the same math under your fingers: tone stacks, feedback loops, bias points, live.

Tools · Free
Turn a real amp's tone controls and watch the frequency response move — then hear it. 55 component-value presets across 15 circuit families.
Podcast
Tech page · Mods & Builds
Real Fender Blues Deluxe schematic values for the tone stack, presence control and bias trim — and why its mod list differs from the Hot Rod Deluxe's.