Kalamazoo Bass 50 preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Kalamazoo Bass 50 is the larger tube bass amp in Gibson's budget Kalamazoo line. Two inputs feed a 6EU7 triode stage, a Bass, Treble and Loudness network and a second 6EU7 stage with negative feedback, then a 6EU7 long-tailed-pair inverter. Two fixed-bias EL34s drive two speakers from a solid-state diode supply with a choke. Like the Bass 30 it has only Loudness, Bass and Treble, with more clean headroom.

• Made in: USA
• Wattage: 50W
• Channels: 1
• Preamp tubes: 2× 6EU7
• Power tubes: 2× EL34

Tags: american, vintage, bass, el34, 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.