AX84 Lead Preamp preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

A standalone DIY guitar preamp from the AX84 project, first issued in 2001. Two 12AX7s give three cascaded gain stages, with Gain 1 and Gain 2 controls and a bright-bypassed interstage network, then a cathode follower drives a treble, bass and mid tone stack and a master volume. It is a hot-rodded, high-gain lead circuit meant to feed a separate power amp, which is drawn on a second sheet.

• Made in: USA
• Channels: 1
• Preamp tubes: 2× 12AX7

Tags: american, diy, preamp, high-gain.

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.