What tubes does the Ampeg SVT-8PRO use?

The Ampeg SVT-8PRO uses 3× 12AX7 preamp tubes.

When was the Ampeg SVT-8PRO produced?

The Ampeg SVT-8PRO was produced 2006–2013.

Ampeg SVT-8PRO preset

Close · 68/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Ampeg SVT-8PRO is a hybrid bass head from 2005 with a tube preamp on three 9-pin dual triodes. A -12 dB pad and gain feed the tube stages, with an Ultra Low selector (sub cut, low cut and two Ultra Low voicings), Bright and Ultra High switches, bass and treble, and a mid control with a five-position frequency switch on a tapped inductor. An op-amp drive circuit with a footswitch, a power level control and master follow, with effects loop and balanced output.

Years produced: 2006–2013
Channels: 1
Preamp tubes: 3× 12AX7

Tags: american, bass, 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.