Sunn Model T Super - Bright preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Sunn Model T Super (1978 schematic) is a valve head with Brite and Normal inputs (plus a Both input and thru jacks), each feeding half a 12AX7 with its own channel volume. The channels mix into a second 12AX7 with shared Bass, Mid (with a switch), Treble and Presence controls and a Master volume. A 12AX7 long-tail phase inverter drives four 6550s in fixed bias, from a silicon-diode supply of about 600 V with standby, a hum-balance control and an output impedance selector, plus a line out.

• Made in: USA
• Wattage: 150W
• Channels: 2
• Preamp tubes: 3× 12AX7
• Power tubes: 4× 6550

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.