Fender Twin Reverb AA270 - Normal preset

Verified · 93/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Twin Reverb AA270 is an early silverface Twin Reverb circuit with Normal and Vibrato channels, each with bass, middle and treble. Four 6L6GC tubes on a diode rectifier give the big Fender clean platform, with spring reverb and vibrato but no presence control.

• Years produced: 1970–1972
• Made in: USA
• Wattage: 85W
• Channels: 2
• Preamp tubes: 3× 7025, 1× 12AX7, 2× 12AT7
• Power tubes: 4× 6L6GC

Tags: american, vintage, silverface, clean, reverb, vibrato, 6l6.

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.