Alamo Fiesta preset

verified · 89/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Alamo Fiesta is a small student amp from Alamo Electronics of San Antonio, Texas, from around 1962. Three inputs feed a 12AU6 pentode stage with a Tone control at the input, then a Volume control and a single-ended, cathode-biased 50L6 into an 8-inch speaker for a few watts. A 12AV6 phase-shift oscillator with a Speed control gives tremolo. Series-string heaters and a 35Z5 half-wave rectifier run off a small power transformer.

• Made in: USA
• Wattage: 3W
• Channels: 1
• Preamp tubes: 1× 12AU6, 1× 12AV6
• Power tubes: 1× 50L6

Tags: american, vintage, tremolo, class-a, low-wattage, practice.

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.