EICO HF-81 preset

Verified · 92/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The EICO HF-81 is a stereo tube integrated amplifier, sold as a kit or factory-wired, with identical left and right channels built on ECC83 and ECC82 preamp and driver stages and a push-pull pair of EL84s per side. It combines phono and line preamps, tone controls and power amp on one chassis. Its EL84 output stage makes it a popular platform for restoration and guitar conversion.

Tags: american, vintage, stereo, el84, diy, clean.

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.