Marshall Keyboard 12 5301/5302 preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Marshall Keyboard 12 is a solid-state keyboard combo from the mid-1980s: the 5301 is rated 12 watts, and the 5302 is the 20-watt version from the same combo series as the Lead 20 and Bass 20. Two inputs, each with its own level control, feed an op-amp preamp with Treble, Bass and Volume, then a discrete power amp with MJ2501/MJ3001 Darlington outputs into an 8-ohm 10-inch speaker, with a headphone jack.

• Made in: UK
• Wattage: 12W
• Channels: 1

Tags: british, solid-state, low-wattage, clean.

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.