Marshall JMP Masterlead 30W 2199 Combo - Microphone/Line preset

Close · 72/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Marshall JMP Masterlead 2199 is a 30W combo from the late JMP era, combining a tube-driven preamp with a straightforward master-volume circuit in a portable 1×12 package. It bridges the gap between the large JMP heads and the smaller practice-oriented models.

• Years produced: 1980–1983
• Made in: UK
• Wattage: 30W
• Channels: 1
• Preamp tubes: 3× ECC83
• Power tubes: 2× EL34

Tags: british, combo, jmp, 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.