Holden Wasp preset

Verified · 82/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Wasp is a 100-watt valve head from Holden with two inputs feeding one channel. The Channel 1 input runs through an extra 12AX7 gain stage and its own pre-volume before joining the Channel 2 input, then a treble, middle and bass stack, a shared volume, another gain stage and a master volume. A long-tailed-pair inverter with direct-coupled drivers and a switchable bright network drives four EL34s into 4, 8 and 16-ohm taps.

• Wattage: 100W
• Channels: 1
• Power tubes: 4× EL34

Tags: el34, high-wattage, crunch.

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.