Fender Bandmaster Reverb AA270 - Vibrato preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The AA270 is an early-1970s silverface Bandmaster Reverb head. Normal and Vibrato channels each have two inputs, bass, treble, volume and a bright switch, and the Vibrato channel adds a middle control, tube-driven spring reverb and optical vibrato with speed, intensity and a pedal. A 12AT7 long-tail inverter drives a fixed-bias pair of 6L6GCs from a 5U4GB rectifier into a 4-ohm load, giving clear blackface-style clean tone with a slightly softer feel.

Tags: american, vintage, silverface, reverb, 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.