What tubes does the Harmony H310 use?

The Harmony H310 uses 12AX7 preamp tubes and 6L6 power tubes.

When was the Harmony H310 produced?

The Harmony H310 was produced 1963–1968.

Harmony H310 preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Harmony H310 is a mid-power combo from the mid-1960s representing one of Harmony's more capable amplifiers for its era, with enough output for small gig and rehearsal use. It uses a push-pull 6L6 output stage and includes tremolo and a second instrument channel. The H310 occupies the upper-middle tier of the Harmony amplifier lineup and delivers a dependable, warm American clean tone.

Years produced: 1963–1968
Made in: USA
Wattage: 18W
Channels: 2
Preamp tubes: 12AX7
Power tubes: 6L6

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.