Sunn Sentura II preset

Verified · 91/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Sunn Sentura II has Normal and Bright inputs into two 12AX7 stages with a boost switch, a treble/bass/contour stack with mid boost, and a 6AN8 gain stage and cathodyne inverter driving two fixed-bias 6550s on a GZ34 rectifier. Spring reverb (transistor recovery) and optical tremolo are the only solid-state parts.

• Made in: USA
• Wattage: 60W
• Channels: 1
• Preamp tubes: 1× 12AX7, 1× 12AU7, 1× 6AN8
• Power tubes: 2× 6550

Tags: american, vintage, 6550, reverb, tremolo.

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.