Behringer BT108 Ultrabass preset

Verified · 91/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The BT108 Ultrabass is a small solid-state bass practice combo from Behringer. The instrument input feeds a 4580 op-amp preamp with a volume control and a four-band EQ (high, high-mid, low-mid, low), mixed with a CD input for playing along. A TDA2030 chip power amp drives the internal speaker, with a protection-limiter circuit and a headphone jack that mutes the speaker.

• Made in: China
• Channels: 1

Tags: german, bass, solid-state, 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.