Sunn Sceptre preset

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

The Sunn Sceptre is a 100-watt solid-state amplifier from Sunn's late-1960s transistor range, designed to deliver professional-level output power without the weight and maintenance demands of a comparably rated tube amplifier. Its transistor-based output stage provides clean, consistent amplification with a more immediate, less compressed transient character than the EL34- and 6550-equipped tube models in the Sunn range. The Sceptre was aimed at players and touring professionals who needed reliable high-power performance in a form factor that could withstand the rigours of extended road use.

Tags: american, clean, vintage.

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.