Gibson GA-5 Crest preset

Close · 78/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The GA-5 Crest is a small 1960s Gibson amp with a single channel, two inputs and one volume control, with no tone control. Both halves of a 6EU7 provide the gain, a 6C4 split-load inverter drives a cathode-biased push-pull pair of 6AQ5 output tubes, and a 6X4 rectifier supplies the power, making a few watts into a single speaker. Push-pull rather than single-ended output sets it apart from most student amps.

• Made in: USA
• Channels: 1
• Preamp tubes: 1× 6EU7, 1× 6C4
• Power tubes: 2× 6AQ5

Tags: american, vintage, low-wattage, practice.

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.