Engl Programmable Preamp preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

ENGL's early programmable rack valve preamp, drawn on two sheets, with no power amp. A JFET input stage feeds a TCA140 voltage-controlled gain block and two ECC83s, with gain, lead drive and reverb level set by stored control voltages rather than panel knobs. Op-amp stages run a spring reverb, then voltage-controlled treble, middle, bass and frequency filters, an effects send and return and an LM13600 output volume stage.

• Made in: Germany
• Channels: 1
• Preamp tubes: 2× ECC83

Tags: german, preamp, 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.