Sunn Spectrum Ii preset

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

The Sunn Spectrum II is a solid-state amplifier from Sunn's mid-1970s transistor lineup, offering clean amplification with onboard equalization designed to help players shape their tone without external processing. The Spectrum designation suggests a focus on a broad, full-range frequency response — consistent with Sunn's overall design philosophy — while the solid-state output stage provides maintenance-free operation and consistent performance. The Spectrum II occupied the mid-range of Sunn's solid-state offering, positioned above entry-level models but below the high-power Sentura series.

• Years produced: 1974–1981
• Made in: USA
• Wattage: 100W
• Channels: 2

Tags: american, clean, classic.

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.