Hartke HA5500 preset

Verified · 85/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Hartke HA5500 is a hybrid bass head. Passive and active inputs feed an op-amp buffer that splits into two blended preamps: a dual-triode tube stage with its own level and a parallel solid-state path. A compressor with ratio control follows, then a Contour section, a 10-band graphic EQ with in/out switch, master volume, effects loop and a balanced DI with pre/post and ground-lift. A discrete transistor power amp drives the output.

Tags: bass, solid-state, high-wattage, modern.

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.