Sunn 100S / Sceptre / Sentura II - Bright preset

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

The Sunn 100S, Sceptre, and Sentura II form a family of closely related 100-watt tube heads representing Sunn's mid-tier professional lineup in the late 1960s and early 1970s. These amps offered clean, powerful tube tone for bass and guitar at a step below Sunn's flagship models.

• Years produced: 1967–1972
• 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.