What tubes does the Diezel Vh4 Preamp use?

The Diezel Vh4 Preamp uses 5× 12AX7 preamp tubes.

When was the Diezel Vh4 Preamp produced?

The Diezel Vh4 Preamp was produced 2000s–present.

Diezel Vh4 Preamp preset

Verified · 80/100 confidence. Complete schematic. All component values readable. Parameters derived directly from the circuit.

The Diezel VH4 Preamp is a rack-mount preamp unit that delivers the legendary VH4 circuit in a standalone preamp format, giving recording and live engineers access to all four VH4 channels without the power amp section. It faithfully reproduces the characteristic Diezel tight, harmonically complex tones that have made the VH4 a studio and stage staple. An essential tool for guitarists who run a separate power amp or direct-to-desk setup.

Years produced: 2000s–present
Made in: Germany
Channels: 4
Preamp tubes: 5× 12AX7

Tags: german, high-gain, 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.