Marshall JVM205H - Clean/Crunch preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The JVM205H is the 50-watt two-channel head of Marshall's JVM2 series, introduced in January 2008, a year after the four-channel JVM410H. Clean/Crunch and Overdrive channels each have three footswitchable modes, switched by relays under a microcontroller with MIDI in and through. Four ECC83s make up the preamp, with op-amp-driven reverb and two effects loops; a fifth ECC83 phase inverter drives two EL34s with dual bias trims.

• Years produced: 2008–present
• Made in: UK
• Wattage: 50W
• Channels: 2
• Preamp tubes: 5× ECC83
• Power tubes: 2× EL34

Known for: Sean Long.

Tags: british, crunch, high-gain, el34, mid-wattage, two-channel, reverb.

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.