What tubes does the Ampeg SVT-3PRO use?

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

Who famously used the Ampeg SVT-3PRO?

Wayne Banks, Amanda McCoy, Tracy Goode, and Jimi "Jazz" Prescott are among the notable players associated with the Ampeg SVT-3PRO.

Ampeg SVT-3PRO preset

Verified · 91/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The SVT-3PRO is Ampeg's hybrid rackmount bass head: a tube preamp feeding a 450-watt MOSFET power amp. The preamp adds switchable Ultra Hi/Ultra Lo voicing, a bright switch and a nine-band graphic EQ to the classic Ampeg bass/mid/treble layout. It became a standard touring and rental head for players who wanted Ampeg tube grit in a single rack-size box.

Wattage: 450W
Channels: 1
Preamp tubes: 3× 12AX7

Known for: Wayne Banks, Amanda McCoy, Tracy Goode, Jimi "Jazz" Prescott.

Tags: american, bass, hybrid, high-wattage, modern.

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.