Gallien-Krueger Backline 115/210/250/600 Preamp (206-0181) - Overdrive preset

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

The Gallien-Krueger Backline 600 is a solid-state bass amplifier head designed as an affordable entry into the GK product lineup. The Backline series shared preamp circuitry across the 115, 210, 250, and 600 models, offering consistent GK tone at budget-friendly price points. It includes an overdrive channel alongside the signature GK clean channel.

• Years produced: 2000–2010
• Made in: USA
• Wattage: 600W
• Channels: 2

Tags: american, modern, bass, solid-state.

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.