Transatlantic Bassman - Normal preset

Verified · 93/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Transatlantic Bassman is a hand-built amp that puts a Marshall-style EL34 output section, with a Plexi-type output transformer, into a Fender Bassman chassis. Two channels of 12AX7 preamp with volume, treble and bass feed a 12AX7 phase inverter and a pair of EL34s, with a presence control and a 'viscosity' bright switch. The name reflects the mix of American and British circuit ideas.

Tags: el34, plexi, crunch, two-channel, hand-wired.

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.