Peavey Mark III Bass - Channel B preset

Verified · 89/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Peavey Mark III Bass is a 1979-80 solid-state bass amp from Peavey's Mark III series. Channel A has Pre Gain, bass, mid and treble with a Post Gain; Channel B has Pre Gain, bass and treble, a parametric mid with shift control, and Post Gain. Automix and footswitched channel select and combine sit alongside a six-slider graphic EQ that either channel can use, a compressor, and an electronic crossover with high and low outputs, driving a transistor power module.

• Made in: USA
• Channels: 2

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

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.