Bogen MA-40 - Aux preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Bogen MA-40 is a 40-watt tube PA amplifier from American commercial audio manufacturer Bogen, designed for medium-capacity public address applications requiring greater output power than smaller models. Built to institutional quality standards, it delivers reliable amplification through multiple microphone and line inputs. Like many Bogen PA amplifiers, the MA-40 has attracted interest from guitar players and DIY enthusiasts for its warm vintage tube character.

Tags: american, vintage.

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.