Gibson KEH-R preset

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

The KEH-R is a 1940s Gibson amp with two inputs and no tone control. The high-gain input runs through a 6SQ7 triode and the amp's single volume control, then mixes with the second input at the grid of a 6C5 gain stage. A 6N7 twin triode works as a paraphase inverter driving a cathode-biased push-pull pair of 6V6GT tubes, with feedback from the output plates, on a 5Y3 rectifier with the speaker field coil as the filter choke.

• Made in: USA
• Wattage: 15W
• Channels: 1
• Preamp tubes: 1× 6SQ7, 1× 6C5, 1× 6N7
• 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.