Heathkit A-9A preset

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

The A-9A is a Heathkit integrated hi-fi amplifier kit, not a guitar amp. 12AX7 and 12AU7 preamp and tone stages feed a 12AU7 inverter driving a push-pull pair of 6L6Gs for about 20 watts, with a 5U4G rectifier; its input selector chooses sources rather than giving separate channels. A clean, full-range 6L6 amplifier.

• Made in: USA
• Wattage: 20W
• Channels: 1
• Preamp tubes: 1× 12AX7, 2× 12AU7
• Power tubes: 2× 6L6G

Tags: american, vintage, clean, 6l6, mid-wattage, diy.

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.