Hagstrom 840 preset

Close · 68/100 confidence. Most values readable. Minor gaps filled by inference from similar circuits.

The Hagstrom 840 was among the more powerful amplifiers in the brand's solid-state lineup, aimed at larger venues and players who needed more stage volume. At approximately 40 watts it provided sufficient headroom for most club and concert hall situations of the 1970s. Its controls were straightforward, keeping operation simple for working musicians, while the circuit was voiced to deliver a clean, present tone. The 840 represents the top of Hagstrom's amplifier range during the brand's most active amp-building years.

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.