Diezel VH4 - Heavy preset

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

The Diezel VH4 is a 100-watt German head with four channels, Clean, Crunch, Mega and Lead, each with its own gain, EQ and master and its own insert loop. A Deep control adds low-end punch in the power amp. Its tight bottom, articulate high gain and huge range made it one of the defining high-gain amps of the late 1990s and 2000s, from Tool to Muse and Metallica.

• Years produced: 1994–present
• Made in: Germany
• Wattage: 100W
• Channels: 4
• Preamp tubes: 6× 12AX7
• Power tubes: 4× KT77

Known for: Adam Jones, Matt Bellamy, James Hetfield.

Heard on: Jambi — Tool (2006); Thought Contagion — Muse (2018).

Tags: german, high-gain, metal, multi-channel, 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.