Ampeg VL-502 / VL-1002 (Tube Board) - Main preset

Close · 72/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The VL-502/VL-1002 Tube Board schematic documents the output tube section of Ampeg's 50-watt and 100-watt EL34 guitar heads. The Main tube board contains the EL34 output tubes, driver stage, and output transformer. A key reference for technicians working on the power section of these EL34-powered guitar heads.

• 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.