Allen Amplification Class Act preset

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

The Allen Amplification Class Act (Plexi version) is a single-ended boutique amp from Walton, Kentucky. High and Low inputs feed two 12AX7s in a Plexi-style layout: gain stage, Volume, second stage and cathode follower driving a Marshall-type Treble, Bass and Mid stack, then a Master Volume. One cathode-biased output valve takes a 6K6, 6V6, 6L6, EL34 or KT88, with negative feedback and a 5Y3GT, 5AR4 or solid-state rectifier.

• Made in: USA
• Channels: 1
• Preamp tubes: 2× 12AX7
• Power tubes: 1× 6V6

Tags: american, boutique, class-a, plexi, low-wattage.

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.