Sunn Model T preset

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

The Sunn Model T (1973 drawing) is a tube head with Bright and Normal inputs, bass/mid/treble and presence controls, a line out, fixed-bias 6550 output tubes at about 500 V and 16/8/4-ohm taps. Its loud, thick overdrive made it a cornerstone of doom and drone, and Fender-era Sunn later reissued it.

• Made in: USA
• Wattage: 150W
• Channels: 2
• Preamp tubes: 3× 12AX7A
• Power tubes: 4× 6550

Known for: Greg Anderson, Stephen O'Malley.

Heard on: Troubled Air — Sunn O))) (2019).

Tags: american, vintage, 6550, crunch, high-wattage.

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.