Marshall Haze MHZ15 - Overdrive preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Haze MHZ15 is a 15-watt two-channel valve head from Marshall's Haze range, launched in 2009. A Normal channel with its own volume and voicing switch and an Overdrive channel with Gain and Master share a treble, middle and bass stack, with a microcontroller-driven digital effects section including reverb. An ECC83 long-tail inverter drives two fixed-bias 6V6GTs, with a pair of bias trims.

• Introduced: 2009
• Made in: UK
• Wattage: 15W
• Channels: 2
• Preamp tubes: 3× ECC83
• Power tubes: 2× 6V6

Tags: british, crunch, 6v6, low-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.