Sunn T50C - Channel 2 preset

Verified · 84/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Sunn T50C is a Fender-era (1999) all-valve combo from the revived Sunn line. Its preamp runs on 12AX7-family valves with a spring reverb and an effects loop, and a 12AX7WA long-tail phase inverter with a Presence control in the feedback loop drives two 6L6GCs in fixed bias with separate bias and balance adjustments. An output-power switch drops the plate supply from about 470 V to 235 V for roughly 50 or 12.5 watts, and a tube-fault indicator lights if either output valve fails. Outputs cover 4, 8 and 16 ohms.

• Made in: USA
• Wattage: 50W
• Channels: 2
• Preamp tubes: 7× 12AX7, 1× 12AT7
• Power tubes: 2× 6L6GC

Tags: american, hybrid, bass, two-channel.

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.