What tubes does the Fender 6G12 Lo use?

The Fender 6G12 Lo uses 4× 12AX7, 1× 12AT7 preamp tubes and 4× 6L6 power tubes.

When was the Fender 6G12 Lo produced?

The Fender 6G12 Lo was produced 1961–1963.

Fender 6G12 Lo preset

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

The Concert 6G12 Lo is an alternate layout document for the brownface Concert. The circuit and tonal character are identical to the standard 6G12 — 40 watts, four 6L6 output tubes, and a 4×10 speaker array with brownface-era warmth and clarity.

Years produced: 1961–1963
Made in: USA
Wattage: 40W
Channels: 2
Preamp tubes: 4× 12AX7, 1× 12AT7
Power tubes: 4× 6L6

Tags: american, clean, brownface, 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.