ENGL Preamp 520 - Lead preset

Verified · 88/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The ENGL Preamp 520 is a German rack tube preamp with Clean, Rhythm and Lead channels, relay switching, an FX loop, a headphone amp and a MIDI interface. It uses four ECC83s and needs a separate power amp.

• Made in: Germany
• Channels: 3
• Preamp tubes: 4× ECC83

Tags: german, preamp, multi-channel, high-gain.

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.