What tubes does the Soldano Sp77 Preamp use?

The Soldano Sp77 Preamp uses 5x 12AX7 preamp tubes.

When was the Soldano Sp77 Preamp produced?

The Soldano Sp77 Preamp was produced 1988–1998.

Soldano Sp77 Preamp preset

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

The Soldano SP-77 is a rack-mount tube preamplifier offering Soldano's high-gain voicing in a format designed for professional rack systems. It features two independent channels — rhythm and lead — each with full EQ and gain controls, making it a flexible centerpiece for live and studio rigs. The SP-77 was widely used by professional players in the late 1980s and early 1990s as a premium high-gain rack preamp.

Years produced: 1988–1998
Made in: USA
Channels: 2
Preamp tubes: 5x 12AX7

Tags: high-gain.

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.