Ampeg VL-502 / VL-1002 - Channel 1 preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

This board serves Ampeg's early-1990s VL-502 (two power valves) and VL-1002 (four) guitar heads. Two footswitchable channels are switched by VTL5C1 photocells. Channel 1 has preamp volume, high, low, mid and master; channel 2 has preamp volume, gain, a five-position frequency select, high, low, mid and its own master. Each channel has its own reverb level, and six 9-pin dual triodes cover preamp, reverb and the effects loop, with presence and a power-attenuator connection.

Tags: american, el34, high-wattage, two-channel, reverb.

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.