Marshall JCM800 Artist 4203 - Normal preset

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

The Artist 4203 is a 30-watt 1x12 hybrid combo from the mid-1980s, the combo counterpart of the Artist 3203 head. An op-amp preamp offers a footswitchable Normal channel and a Boost channel with LED clipping, each with its own controls, plus spring reverb and an effects loop. An ECC83 phase inverter drives two EL34s for 30 watts RMS, with a direct output, making it a compact gigging and studio combo.

• Made in: UK
• Wattage: 30W
• Channels: 2
• Preamp tubes: 1× ECC83
• Power tubes: 2× EL34

Tags: british, crunch, reverb, mid-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.