What tubes does the Fender Concert 6G12-A - Normal use?

The Fender Concert 6G12-A - Normal uses 4× 7025, 2× 12AX7 preamp tubes and 2× 5881 power tubes.

When was the Fender Concert 6G12-A - Normal produced?

The Fender Concert 6G12-A - Normal was produced 1960–1963.

Fender Concert 6G12-A - Normal preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The 6G12-A is the revised brownface Concert, a 4×10 combo. Normal and Vibrato channels each have Volume, Treble and Bass, with a tapped treble pot. The harmonic vibrato uses two 12AX7s to generate the LFO and split the signal into high and low bands modulated in opposition (Speed, Intensity). A Presence control sits in the feedback loop, and a 7025 long-tail phase inverter drives two fixed-bias 5881s from a silicon rectifier.

Years produced: 1960–1963
Made in: USA
Wattage: 40W
Channels: 2
Preamp tubes: 4× 7025, 2× 12AX7
Power tubes: 2× 5881

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

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.