Harmony H-305A - Channel 1 preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

A Harmony combo with four inputs split across two volume controls and one tone control. A 7025/12AX7 preamp and a second 12AX7 amplifier/phase inverter drive two 6V6GTs into a 12-inch speaker, with a 5Y3GT rectifier. It is a simple, low-powered American amp in the same family as the more common Harmony student combos.

• Made in: USA
• Channels: 2
• Preamp tubes: 2× 12AX7
• Power tubes: 2× 6V6GT

Tags: american, vintage, 6v6, two-channel, breakup.

Schematic-derived preset files for 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.