Sunn Model A - Channel 2 preset

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

The Sunn Model A (1974) is an all-valve two-channel amp. Channel One has Hi and Lo inputs, a 12AX7 with Bass, Treble and Volume and a Treble Boost switch. Channel Two has a JFET input with a Distort/Normal/Low switch, a 12AX7 with Bass, Treble and Volume and its own Treble Boost. An op-amp Mid control with frequency select, a transistor-driven spring reverb assignable to either or both channels, and a Master Volume follow. A 12AX7 phase inverter drives two 6550s in fixed bias, with a 600-ohm line out.

Tags: american, hybrid, reverb, two-channel.

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.