Ampeg VL-501 / VL-502 / VL-1001 - Main preset

Close · 75/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The VL-501/VL-502/VL-1001 Main channel schematic covers the complete signal path of these EL34-powered guitar heads in 50-watt and 100-watt configurations. The Main channel delivers clean to crunch tones through the EL34 power section. A family of versatile tube guitar heads representing Ampeg's serious 1990s guitar amp effort.

• Years produced: 1992–1997
• Made in: USA
• Wattage: 100W
• Channels: 2
• Preamp tubes: 3× 12AX7
• Power tubes: 4× EL34

Tags: guitar, american, modern, mid-wattage, drive.

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.