Hiwatt DR112 PA 100 preset

Verified · 86/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Hiwatt DR112 is a 100-watt tube PA head. Six input channels, built on three ECC83s, each have their own volume and bass/treble network, and mix into an ECC83 mixer and cathode follower with master volume and presence. The drive stage feeds four fixed-bias EL34s into a Partridge output transformer with 4, 8 and 16-ohm taps, from a solid-state bridge supply with standby. Built, like Hiwatt's guitar heads, for loud, clean power.

Tags: british, vintage, el34, high-wattage, clean, hand-wired.

Schematic-derived preset files for the Neural DSP Quad Cortex and 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.