Harmony H194 preset

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

The H194 is a small Harmony practice amp. Two input jacks feed a grid-leak-biased 6J5 triode, then a volume control and a second, cathode-biased 6J5 gain stage. A tone control (which also carries the power switch) sits at the grid of a single-ended, cathode-biased 6V6GT, and a 5Y3GT rectifier supplies the power, for about 4 watts. There is no negative feedback, so it breaks up early and easily.

• Made in: USA
• Wattage: 4W
• Channels: 1
• Preamp tubes: 2× 6J5
• Power tubes: 1× 6V6GT

Tags: american, vintage, 6v6, class-a, low-wattage, practice.

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.