Fender Vibrasonic 6G13-A - Normal preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Vibrasonic 6G13-A is a brown-era Fender combo whose preamp and vibrato closely follow the brownface Super 6G4-A. Normal and Vibrato channels each have two inputs and their own volume, treble and bass, with a presence control in the feedback loop. Two 12AX7s run the harmonic vibrato with speed, intensity and a footpedal jack, and a 7025 long-tail inverter drives two 5881s on a silicon diode rectifier.

• Made in: USA
• Wattage: 40W
• Channels: 2
• Preamp tubes: 4× 7025, 2× 12AX7
• Power tubes: 2× 5881

Tags: american, vintage, brownface, clean, vibrato, 6l6.

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.