Onkyo M-501 - Left preset

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

The Onkyo M-501 is a Japanese solid-state stereo power amplifier from the 1980s designed for hi-fi audio reproduction. While not a guitar amplifier, it was occasionally used in professional audio settings for its clean power delivery and reliability. Onkyo built a strong reputation in consumer and professional audio electronics during this era.

• Years produced: 1980s
• Made in: Japan
• Channels: 2

Tags: solid-state, modern.

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.