Engl Control Circuit Board preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

Control circuit board schematic for an ENGL amplifier. Documents the channel switching, relay logic, and control circuitry that manages the preamp channel and feature selection in ENGL heads.

• Years produced: 2000s–present
• Made in: Germany

Tags: german, sub-circuit.

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.