What tubes does the Ampeg VL-503 - Channel 2 use?

The Ampeg VL-503 - Channel 2 uses 3× 12AX7 preamp tubes and 2× EL34 power tubes.

When was the Ampeg VL-503 - Channel 2 produced?

The Ampeg VL-503 - Channel 2 was produced 1993–1998.

Ampeg VL-503 - Channel 2 preset

Close · 78/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The VL-503 Channel I alternate schematic provides supplementary documentation for the first channel of Ampeg's three-channel 50-watt EL34 guitar head. This document may represent a different PCB section or production revision of the VL-503.

Years produced: 1993–1998
Made in: USA
Wattage: 50W
Channels: 2
Preamp tubes: 3× 12AX7
Power tubes: 2× 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.