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Diezel VH4 Overdrive/Preamp Pedal

All Analog Pedal Based on Legendary VH4 Amp



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Product Description

The Diezel VH4 is one of the most loved high gain metal amps in the world. It's four channel design has found its way in to studios around the world becoming a go to amp for a lot of metal bands. Now the incredibly powerful channel three from the VH4 is not available in this single pedal that can either go straight in to the front of your amp or in to the power amp section acting as a standalone preamp.

So Much Power

While the VH4 does indeed have a fourth even heavier channel than the third channel this pedal is based on it has all of the gain you will ever need. Turned down low this pedal goes from a saturated mid gain sound all the way up to screaming solo heaven that only gets better when matched up with a classic green boost pedal.

VH4 Control Scheme

With some amp style overdrive pedals they often miss off a lot of the controls that give that pedal character. The VH4 does not with a full 3 band EQ like you find in the preamp section on top of the Deep and Presence controls that are normally part of the power amp section. These are part of what made up the signature Diezel sound so it only makes sense that they are here on this pedal.

Preamp or Overdrive Pedal?

Here's what Diezel say

Because this pedal is made in a very similar way to the original preamp in the actual amp it can be used as either an overdrive pedal or as a preamp to feed in to your amps power section. The benefit here is that by going direct in to the power amp you get all of the great Diezel tone uncoloured by your own amplifiers clean channel.

When musical architect Peter Diezel created the DIEZEL VH4 in 1994 he unknowingly sparked a revolution in tone, creating such a demand that he literally had no choice but to put his own personal creation into production. More than 20 years later, the VH4 has become one of the most loved high gain mps in the world and the powerhouse that put DIEZEL at the forefront of music with some of the most iconic players (from Metallica to Guns N Roses) performing with it on some of the biggest stages and in studios around the world. For the first time ever, this powerful performance tool can be found in the new DIEZEL VH4 PREAMP PEDAL with all the lush, dynamic overdrive character of the VH4 Channel 3.

Unlike traditional overdrive stomp boxes, the VH4 Pedal is a true preamp which delivers an authentic representation of its namesake - real Diezel tone - not emulated, not modeled, but sincerely reproduced. The entire signal architecture is faithful to the original: Bass, Mid, Treble and variable Deep and Presence controls allow you to tailor the uniquely Diezel Overdrive character. The command found in the Gain control gives a player everything they will ever need with lower gain settings producing the classic Diezel sparkle and chime to saturated mid-gain sounds, to scorching Diezel leads by cranking it all the way up.

As close to the original VH4 preamp, the VH4 pedal can be used as either an overdrive or as a standalone preamp to feed into your amps power section. What players take away by going direct into the power amp is all the dynamic, unfiltered Diezel tone by simply plugging into your amplifiers clean channel. Two outputs are provided with the first intended to connect to the front of a guitar amplifier and the second allows for a connection to a line-level power amp or power section of your amp via the Effects Return.


  • Preamp pedal based on the legendary VH4 Channel 3 
  • Controls: Volume, Gain, Bass, Middle, Treble, Presence and Depth
  • Pedal be powered between 12-18VDC (no battery)
  • 12V power supply included
  • 18V power supply cable included (for use with 9V isolated power supplies)
  • Assembled in USA


Customer Reviews


4 reviews





Mr Leonel Jose De Sousa Cordoves20th Nov 2023

Sound 5

Trusted Customer13th Jan 2022

Value 4Looks 5Durability 5Sound 5

Mr David Carpenter10th May 2021

Although it took about an hour of concerned and initially disappointed fiddling with the various settings and 4 amps I had before I got it to sound the way I wanted (like Tool), once I got there, whoa! Yes, this pedal makes the single biggest difference to sound like Adam Jones from Tool than any other item in the chain. I already had Mesa Boogie and Marshall valve amps, lots of pedals, a Gibson Les Paul Custom Silverburst, drop D tuning, heavy strings, and had always wondered about getting the actual VH4 amp. When I found this VH4 pedal I was sceptical initially, read some reviews, then took the chance, was initially disappointed for the first hour, but then bingo! This really does get you in the right place, and once the sound was right I was playing away for hours getting more and more pleased at how good it sounded. I realise that Tool use multiple amps, can play far better than I can, everything is recorded immaculately, blah blah blah, but for someone who wants to get close to the sound in a home environment for personal pleasure and to see what other things I can improvise sound like with a similar Tool sound, this pedal is perfect. So I would thoroughly recommend it, but just be patient initially - for the first hour I was getting that sinking feeling that I had wasted my money on chasing the impossible, as I tried plugged into this amp then that. In the end my best sound was plugging the pedal straight into the power amp of the Sub Zero 60 amp using the VH4 power amp output. That sounded better than going into the front end of the Mesa Boogie Nomad 45 and Marshall SL5. It really does sound like Tool, given all the caveats. It is worth the money if that is what you are aiming for.

Value 5Looks 5Durability 5Sound 5

Mr Daniel Robbins31st Oct 2020

Value 5Looks 5Durability 5Sound 5

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