Ampeg SVT Preamp - Channel 1 preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

A standalone preamp schematic for the Ampeg SVT, detailing the multiple 12AX7 gain stages, the six-position midrange frequency selector, and the bass and treble tone stack that constitute the SVT's distinctive preamp circuit. The SVT preamp uses a cascaded gain architecture with a passive mid-scoop tone stack, producing the characteristic bump-and-scoop response that cuts through a live mix while preserving low-end weight. This document is fundamental for technicians troubleshooting preamp gain issues, tone stack component failures, or channel switching in vintage SVT units.

• Made in: USA
• Preamp tubes: 6× 12AX7, 2× 12DW7

Tags: american.

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.