Ampeg SVT Power Amp - Main preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

A standalone power amplifier schematic for the Ampeg SVT, covering the six output tube push-pull stage and its driver circuitry independent of the preamp section. The SVT power amp is a fixed-bias class AB design using a matched sextet of output tubes (originally 6146B, later 6550A) driving a bespoke laminated output transformer. This schematic is critical for technicians addressing output section failures, transformer assessment, or output tube replacement bias calibration.

• Made in: USA
• Wattage: 300W
• Power tubes: 6× 6550A

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.