What tubes does the Alamo Amp 3 use?

The Alamo Amp 3 uses 1× 6SL7 preamp tubes and 1× 6V6 power tubes.

Who famously used the Alamo Amp 3?

J.D. Simo are among the notable players associated with the Alamo Amp 3.

Alamo Amp 3 preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Alamo Amp 3 is a simple single-ended tube amp from Alamo Electronics of San Antonio, Texas. Three inputs feed both halves of a 6SL7 octal twin triode, with a Volume control and a Tone control between the two stages. One cathode-biased 6V6 drives the output transformer, with a negative-feedback resistor from the speaker winding back to the second stage, and a 5Y3GT rectifier powers the supply.

Made in: USA
Wattage: 5W
Channels: 1
Preamp tubes: 1× 6SL7
Power tubes: 1× 6V6

Known for: J.D. Simo.

Tags: american, vintage, class-a.

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.