Kalamazoo Bass 30 preset

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

The Kalamazoo Bass 30 is a tube bass combo from Gibson's budget Kalamazoo brand. Two inputs feed a 6EU7 triode stage, a Bass, Treble and Loudness network, a second 6EU7 gain stage and a 6EU7 long-tailed-pair inverter. Two 7591s with adjustable fixed bias drive two 10-inch speakers in a sealed cabinet, powered by a solid-state diode supply rather than a rectifier tube. Just Loudness, Bass and Treble, for a warm, round bass tone.

• Made in: USA
• Wattage: 30W
• Channels: 1
• Preamp tubes: 2× 6EU7
• Power tubes: 2× 7591

Tags: american, vintage, bass, mid-wattage.

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.