Marshall Jcm600 60W preset

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

The Marshall JCM600 is a 60-watt two-channel head produced in the late 1990s as a cost-effective alternative to the more expensive JCM2000 series, offering similar dual-channel functionality at a lower price point. Running four EL34s in a slightly unusual configuration for 60 watts, the JCM600 produces a bold, assertive tone with the characteristic Marshall midrange push. It shared some circuit elements with the JCM900 platform while introducing features from the emerging JCM2000 design, making it an interesting transitional model in Marshall's history.

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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.