Ampeg SVT-IIP preset

Verified · 90/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Ampeg SVT-IIP is a rack-mount tube bass preamp from 1990 with no power stage. Bright and normal inputs feed three 12AX7s with volume, Ultra Low and Bright switches, bass, treble, and a midrange control with a five-position frequency switch on a tapped inductor. A footswitchable six-band op-amp graphic EQ with a level slider follows, then main outputs and a transformer-balanced XLR output with pre/post and level switches.

• Made in: USA
• Channels: 1
• Preamp tubes: 3× 12AX7

Tags: american, bass, preamp, hybrid.

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.