Marshall MA50 / MA100 - Clean preset

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

The Marshall MA50 and MA100 are valve heads and combos from Marshall's lower-cost MA series of the late 2000s. Clean and Overdrive channels on ECC83s each have their own volume and Treble/Middle/Bass, with Gain, Crunch Balance and relay boost on the overdrive side. Solid-state reverb and an effects loop feed an ECC83 phase inverter with Presence and Resonance, driving four EL34s (MA100) or two (MA50) in fixed bias.

• Introduced: 2009
• Wattage: 100W
• Channels: 2
• Preamp tubes: 3× ECC83
• Power tubes: 4× EL34

Tags: crunch, el34, high-wattage, two-channel.

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.