Heathkit A-7E preset

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

The A-7E is an early Heathkit audio amplifier kit — a hi-fi amplifier, not a guitar amp. A 12SL7 preamp, 12SQ7 amplifier and 12SN7 amplifier/paraphase inverter drive a push-pull pair of 12A6 beam tubes for about 7 watts, with a 5Y3GT rectifier. A simple octal-tube design with a soft, clean low-power voice.

• Made in: USA
• Wattage: 7W
• Channels: 1
• Preamp tubes: 1× 12SL7, 1× 12SQ7GT, 1× 12SN7GT
• Power tubes: 2× 12A6

Tags: american, vintage, clean, low-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.