Diezel VH4

The Diezel VH4 is a four-channel, 100-watt tube amplifier handmade in Germany, renowned for its tight low-end, aggressive midrange, and studio-quality gain. Adam Jones of Tool uses the VH4 for its ability to produce massively saturated tones while maintaining note clarity in drop-D tuning — essential for the band's complex, polyrhythmic arrangements. Each of its four channels offers independent EQ and gain, allowing seamless transitions from clean atmospherics to crushing distortion within a single song. The VH4's German engineering delivers the precision that Tool's meticulous compositions demand.