Ampeg SVT Power Amp Rev F - Main preset

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

The SVT Power Amp Rev F schematic documents a later factory revision of the original SVT output stage. Six 6550 tubes in push-pull configuration deliver 300 watts. Rev F incorporates updated bias circuitry and driver improvements developed through Ampeg's ongoing factory refinements to maintain the SVT's legendary reliability at touring power levels.

• Years produced: 1969–present
• Made in: USA
• Wattage: 300W
• Channels: 1
• Preamp tubes: 2× 12AU7
• Power tubes: 6× 6550

Known for: Paul McCartney, Geddy Lee, John Entwistle, Lemmy Kilmister, Geezer Butler, Cliff Burton.

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

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.