Sound City Concord preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Sound City Concord is a British valve combo with two inputs, volume, a bright switch, bass and treble. A Hammond reverb unit has reverb volume and sensitivity controls. Three ECC83s and two ECC81s drive a pair of EL34s, and a VU meter shows output level.

• Made in: UK
• Channels: 1
• Preamp tubes: 3× ECC83, 2× ECC81
• Power tubes: 2× EL34

Tags: british, vintage, el34, reverb.

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.