Friedman Dirty Shirley preset

Close · 72/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Dirty Shirley is Friedman’s single-channel, 40-watt head for vintage classic-rock tones in the spirit of 1960s and ’70s British amps, with a lower-gain voice than the brand’s high-gain models. Gain, Master, Bass, Middle, Treble and Presence sit over three 12AX7s and a pair of 5881 (6L6-type) output tubes, with High and Low inputs and a transparent series effects loop.

• Made in: USA
• Wattage: 40W
• Channels: 1
• Preamp tubes: 3× 12AX7
• Power tubes: 2× 5881

Tags: american, boutique, 6l6, crunch.

Schematic-derived preset files for 16 Fractal and Line 6 modelers: Axe-Fx II/XL/XL+, Axe-Fx III, FM3, FM9, and the full Helix family (Floor, LT, Rack, HX Stomp, HX Stomp XL, Native).

Gridleak extracts amp parameters from original circuit schematics using AI vision — component values, gain staging, tone stack topology, tube types — then generates native preset files for every supported modeler. Every extraction is scored 0–100 and the score is published.