Multivox Mx 312 Tape Echo preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Multivox MX-312 is a tape echo unit from the Multivox organization, not a standalone amplifier, representing the effects side of their product catalog. Tape echo units like the MX-312 were used alongside amplifiers in the 1960s and 1970s to add slapback and repeating delay effects popular in rock, country, and surf music. This service document covers the maintenance and repair of the tape mechanism and electronics.

• Years produced: 1970s
• Made in: USA

Tags: american, 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.