Gibson KEH preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The KEH is an early Gibson amp, its drawing redrawn by the factory in 1956. It has two inputs, one fitted with a volume control, and no tone control. A 6SJ7 pentode preamp feeds a 6J5 split-load (cathodyne) phase inverter driving a cathode-biased push-pull pair of 6V6 output tubes. A full-wave valve rectifier supplies the power, with the speaker's field coil acting as the filter choke.

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.