Eastern Electric M156 MkII preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The M156 MkII is a tube hi-fi power amplifier from Eastern Electric built around four EL156 output pentodes in push-pull parallel. An input transformer and a 12AU7 transformer-coupled driver feed the output stage, with a bias meter and a soft-start circuit for the big valves; it is a modern audiophile design rather than an instrument amp.

• Channels: 1
• Preamp tubes: 1× 12AU7
• Power tubes: 4× EL156

Tags: modern, power-amp, high-wattage.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.