Ampeg V4 Power Amp Section - Main preset

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

The Ampeg V-4 power amplifier schematic covers the four-tube 6L6GC output stage of the V-4 guitar head, a class AB push-pull design producing 100 watts through Ampeg's proprietary guitar-optimized output transformer. The V-4 power stage was carefully voiced for guitar frequencies with an output transformer designed to complement the 6L6GC's natural harmonic profile. This schematic is used by technicians for output tube replacement, bias adjustment, and output transformer assessment on vintage V-4 units.

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.