The Draco Amp Distortion is a highly sought-after high-gain distortion effect that originated in the DIY community. It is based on the Mesa/Boogie Dual Rectifier Solo Head and was first designed by user “electrictabs” on the DIYStompboxes forum in 2005.

The pedal uses the Fetzer Valve technique, developed by Runoffgroove, to convert the tube stages of the Dual Rectifier Solo Head into JFETs. This allows the pedal to emulate the tone of the original amplifier as closely as possible. While it is impossible to perfectly replicate the sound of tubes, the Draco Amp Distortion does an excellent job at delivering high-gain distortion.

Since its original design, the pedal has undergone a few minor tweaks by the DIY community. These include scaling the tone stack for lower noise and adding Miller capacitors on the JFETs. Aion FX has incorporated these changes into their version of the pedal, along with significant improvements to the power supply filtering.

The Draco Amp Distortion can be built using either through-hole or surface-mount (SMD) JFETs. Aion FX offers J201s in SMD format that have been pre-soldered to adapters, making them usable as through-hole parts. This makes it easier for DIY hobbyists who may be intimidated by SMD components.

It is important to note that due to the extremely high-gain nature of the pedal, it may oscillate on higher gain settings. This is normal, but the documentation provides build notes and suggestions on how to minimize or eliminate this oscillation.

Summary created by AI from the original source.