Ampeg SVT-II - Main preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The SVT-II is a late-1980s reissue/revision of the original SVT, bringing the classic 300-watt all-tube bass head back to market with updated cosmetics and minor circuit refinements. It retains the essential character of the original SVT—massive low-end punch, natural tube compression, and the legendary Ampeg midrange—making it immediately familiar to SVT devotees.

• Years produced: 1988–1993
• Made in: USA
• Wattage: 300W
• Channels: 1
• Preamp tubes: 6× 12AX7, 2× 12AU7
• Power tubes: 6× 6550

Known for: Various professional bass players.

Tags: bass, american, vintage, high-wattage, clean.

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.