Vox Foundation / Super Foundation Bass (Mk III) - Distortion preset

Close · 66/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

This drawing is the solid-state Mk III bass preamp shared by Vox's Dynamic Bass, Foundation Bass and Super Foundation Bass of the late 1960s. A Distortion channel with its own inputs, a transistor fuzz circuit, Bass and Treble, a mid-range boost selector and Volume sits beside a Tone 'X' channel with its own inputs, tone network and Volume. A transistor mixer combines the two ahead of the power stages, drawn on other sheets.

• Made in: UK
• Channels: 2

Tags: british, bass, vintage, 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.