Harmony H-322 preset

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

The Harmony H-322 is one of Harmony's larger amps: a pair of fixed-bias 7591s in push-pull on a GZ34 rectifier, driving four 8-ohm speakers. Three inputs feed a remote panel with a ganged volume plus treble and bass. Two low-noise 12AX7 stages and a 6C4 lead to a 12AX7 gain stage and cathodyne inverter, with negative feedback. There is no reverb or tremolo; the 7591s give a firm, full clean sound with plenty of headroom.

• Made in: USA
• Wattage: 20W
• Channels: 1
• Preamp tubes: 2× 12AX7, 1× 6C4
• Power tubes: 2× 7591

Tags: american, vintage, reverb, tremolo, clean, mid-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.