Sunn 100S+ / Spectrum II - Bright preset

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

The Sunn 100S+ and Spectrum II are closely related tube heads from Sunn's core lineup, delivering 100 watts of clean tube power. They were workhorses of early 1970s live sound, equally capable as bass or guitar amplifiers.

• Years produced: 1968–1972
• Made in: USA
• Wattage: 100W
• Channels: 2
• Preamp tubes: 4× 12AX7
• Power tubes: 4× 6550

Tags: american, vintage, clean.

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.