Multivox Combo Bass Amp (1975) preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

This circa-1975 Multivox combo bass amp is a small single-ended valve amplifier. A microphone input and two instrument inputs mix into one half of a 12AX7, followed by Volume and Tone controls and the second 12AX7 stage, which drives a single cathode-biased 7591 into a 12-inch speaker with no negative feedback. Two silicon diodes rectify the supply. Multivox was a New York maker and importer of instruments and amplifiers, including the Premier brand.

Tags: american, bass, vintage.

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.