Gibson EH-125 preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The EH-125 is an early Gibson single-channel amp with a field-coil speaker. One input feeds a 6SQ7 stage while a second input enters at the next stage; a volume and a tone control sit between the two 6SQ7s. A 6J5 split-load phase inverter then drives a push-pull pair of 6V6GTs with no negative feedback, on a 5Y3 rectifier that uses the speaker field coil as its filter choke.

• Made in: USA
• Channels: 1
• Preamp tubes: 2× 6SQ7, 1× 6J5
• Power tubes: 2× 6V6GT

Tags: american, vintage, clean, 6v6.

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.