Harmony H-410A preset

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

The Harmony H410-A is a small tremolo combo. Three inputs feed a single 12AX7 used as two cascaded gain stages, followed by one tone and one volume control, and a single-ended, cathode-biased 6BQ5 (EL84) drives a 3.2-ohm speaker through a 5Y3 rectifier supply. A 6AU6 phase-shift oscillator provides tremolo with speed and intensity controls and a footswitch jack. It is a simple student amp that saturates early with a bright, compressed edge.

• Made in: USA
• Wattage: 5W
• Channels: 1
• Preamp tubes: 1× 12AX7, 1× 6AU6
• Power tubes: 1× 6BQ5

Tags: american, vintage, 6v6, tremolo, breakup.

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.