Vox Concert 501 - Channel 1 preset

Verified · 84/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Concert 501 is a 50-watt all-tube Vox combo with five ECC83s and a pair of EL34s in Class AB. Two channels each have treble, middle, bass and volume, and it adds a master volume and spring reverb.

• Introduced: 1986
• Made in: UK
• Wattage: 52W
• Channels: 2
• Preamp tubes: 5× ECC83
• Power tubes: 2× EL34

Tags: british, el34, two-channel, reverb, mid-wattage.

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.