Harmony H-310 preset

verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The H-310 is a compact single-channel combo with a Hammond Type F spring reverb switched by footswitch. One half of a 6EU7 recovers the reverb and mixes it with the dry signal into the second half, followed by a volume and a tone control. A single-ended, cathode-biased 6BQ5 (EL84) on a 5Y3GT rectifier drives an 8-ohm speaker. Low-powered and quick to break up, with a bright, chewy edge.

• Made in: USA
• Channels: 1
• Preamp tubes: 1× 6EU7
• Power tubes: 1× 6BQ5

Tags: american, vintage, el84, reverb, 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.