Multivox 7591 Tube Amp (c. 1976) preset

Close · 76/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

This 1976 Multivox valve amp is a simple single-ended combo. A microphone input and two instrument inputs mix into the first half of a 12AX7, followed by Volume and Tone controls and the second 12AX7 stage, which drives a single cathode-biased 7591A into an 8-ohm speaker. A 6AV6 runs the tremolo, with a speed control and footswitch jack, from a two-diode supply. Multivox was a New York maker and importer of instruments and amplifiers.

• Made in: USA
• Channels: 1
• Preamp tubes: 1× 12AX7, 1× 6AV6
• Power tubes: 1× 7591A

Tags: american, vintage, clean.

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.