Ampeg PB800 - Channel 2 preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Ampeg PB800 is a solid-state bass head from the mid-2000s with two preamp channels that can be used together. Each has 0 dB and -12 dB inputs, gain, low, high, a mid control with its own frequency knob and Ultra High and Ultra Low switches. The channels are mixed and then pass an effects loop with an FX Blend control and a master volume, with a limiter indicator, balanced pre/post and line outputs and a power amp mute.

• Channels: 2

Tags: american, bass, solid-state, two-channel.

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.