Gallien-Krueger GA-77RET preset

Close · 65/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Gallien-Krueger GA-77RET is an early vintage amplifier from Gallien-Krueger's pre-solid-state era, featuring a retro design with built-in reverb and tremolo. GK was founded in 1969, and early models explored various circuit topologies before the company settled on its signature solid-state designs. This model represents the exploratory period of GK's development.

• Years produced: 1965–1972
• Made in: USA
• Channels: 2

Tags: american, vintage.

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.