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Unison Enabled

  • Overview
  • Features
  • Customer Reviews
  • 4.8/5

Regular Price: $149.00


You'll Save 33%


Vicious modern distortion combined with huge clean tones.

Diezel's Herbert amplifier is a 180-watt pulverizer designed to deliver the meanest of means, the cleanest of cleans — and more. Still considered state-of-the art, nearly 20 years after its release, the Diezel Herbert is a mainstay in heavy rock, and extreme metal productions — anywhere bold, powerful electric guitar tones are required.

Developed by Brainworx, and officially endorsed by legendary amp builder Peter Diezel, the Diezel Herbert plug-in masterfully emulates this six KT77-equipped sledgehammer, for UAD hardware and UA Audio Interfaces.

Use your UA Interface to track through the Diezel Herbert — with no latency

Audition 120 separate high-end recording chains, featuring multiple cabinets and classic microphones

Shape tones further with FX Rack’s Vintage Delay, noise gate, high/low filters, and more

Easily dial in god-like clean tones, manicured medium gain, and all out assault with a state-of-the art tone machine

Take a Listen

Take a Listen
Pristine to Punishing

Pristine to Punishing

A contemporary tube amp if there ever was one, the Diezel Herbert plug-in thoroughly captures the hardware's cutting-edge circuit. From impossible-to-distort piano-like clean tones to searing early-VH textures, to absolutely groundbreaking extreme high-gain tones, the Diezel Herbert plug-in is the one-stop-shop for tracking bold, modern guitar tracks.

Diezel FX Rack

Diezel FX Rack

The Diezel Herbert plug-in offers additional control over your tones via the Brainworx FX Rack. It features a Noise Gate, switchable high and low-pass filters, and a Power Soak circuit that allows you to dial in as much overdrive as you want, without having to crank the output gain.

The Diezel Herbert also includes 120 impulse response Recording Chains that were perfectly captured from several boutique cabinets and recorded through Brainworx's vintage Neve console with an array of high-end and vintage microphones and outboard gear, giving you "record ready" tones, instantly.

Unison<sup>™</sup> Technology for UA Audio Interfaces

Unison Technology for UA Audio Interfaces

Harnessing UA’s groundbreaking Unison technology, the Diezel Herbert plug-in gives you the impedance, gain staging, and circuit behaviors that have contributed to making it the "King of Kings" in the world of modern tube amps.


Exacting emulation of the original Diezel Herbert 180-watt guitar amp

Endorsed and fully authenticated by Peter Diezel

120 Recording Chains with multiple speaker cabinets – recorded in Brainworx´s studio using the NEVE VXS72 console, stellar outboard gear and world class microphones

FX Rack features Vintage Delay, noise gate, filter controls, internal power soak, and pre– and post-amp bypass

Feels like a real amp when played through UA Audio Interface's Realtime UAD Processing

Physical input impedance and hands-on control of Gain staging with Unison technology

Customer Reviews

Diezel Herbert Amplifier

Overall Rating


G. Myers

January 14, 2024

Great Clean Tones!

Wish I would have discovered this amp sooner. Thanks!

D. Pejakovic

September 4, 2023

Diezel Herbert

nice amp!

S. Tanner

August 13, 2023

Very nice Guitar-Amp

For my own stuff I like the Marshall Silver Jubilee most. But some clients prefair the Diezel Herbert Amplifier and this is good so. Don't give my very own sound away. xD

W. Schurat

July 7, 2023

Unexpected Performance

Very much like the other UAD Diezel amp this one also has its main strength not in the hi gain area as you would expect but in the clean sounds that are just a smidge before breaking. They sound so so sweet. I bought the Diezel plug ins lately after I had nearly all the other amps because I did not expect much, but I could not have been more wrong. Now they are among my favorite amps, especially this one.

M. Vice

January 29, 2023

Blown away

This amp has seemingly infinite headroom on every channel. The clean channel is powerful and clear with the volume at 100%, and each distorted channel has distinct grind that is easy to dial in. Go ahead and throw your overdrive/distortion pedals in the garbage - this amp will have you covered.
UA and Brainworx have created another brilliantly realistic model. Incredible.

C. Bors

December 10, 2022

Brutal amp power :)

I showed the plugin for guitarist friend, and he listened with opened mouth. Just said: man... brutal sound! UAD became a new fan :)

K. Payoongsook

September 17, 2022

The sound quality and tone is excellent, I love it.

Good value for money, But it would be nice if the plugin can connect to footswitch or keyboard shotcut when changing amp's chanel or when changing preset A,B,C,D due to mouse click is not easy to change Chanel Amp. or change the preset between songs

A. Smith

July 8, 2022

Very versatile. Heavy to light. Metal to silk.

I am very happy with the versatility of this amp simulation. The heavy and metal sounds are articulate with minimal muddying. Better then UAD BE100 Friedman sim. The cleans sparkle in my opinion. This should have been my first amp choice when I bought an Apollo x4 last year.

E. Wang

March 29, 2022

Don't Buy it until they fix the BUG!

The sound is pretty good, but it has catastrophic bug.

Simply, when you have 5 and more instances running in one project, it starts to introduce SIGNIFICANT amount of playback delay which is abnormal especially compared to other UAD amp sim or third party plugin like Amplitube or Archetype, etc.

A. Monov

March 18, 2022


Great Plug-in as usual.

I. Miller

March 10, 2022

Tone Monster

One of the best modelled guitar amps I have used, the 2+ mid cut is a massive high gain channel and the clean channel is magic!

W. Gall

December 18, 2021

Herbert Rocks !!!

One of the best metal amps in the arsenal the magic is in that mid cut and the boost switch on ch2. Yum oh and it pairs great with the VH4 and ENGL's

A. Belli

November 10, 2021

Great amp

I was surprised that this amp isn't just a one trick pony and has really nice clean sounds too.

E. Kocol

September 17, 2021


This thing rocks it just right.

s. fujimoto

June 12, 2021



B. Masters

June 11, 2021

Good for funky clean tones

I found some good low gain settings for funky blues rhythm guitar parts. I never intended to buy this plugin but once I demo'd it in Unison mode I have been using it continuously on several releases. It sounds like a real tube amp.

C. Lovely

April 17, 2021

Excellent Tone

I think this is the greatest digital amp I’ve ever heard. I use the Herbert plug with my own IR’s and I can’t tell a difference between mic’d cab and the plug-in. It’s truly so incredible, that I don’t even want to buy the actual hardware amp. Well done!

J. Slimp

February 12, 2021

My Fav New UAD Amp

I have almost all of the UAD amps and they are really good!

However this one I REALLY love. It’s heavy tones are amazing but it’s also versatile w clean and crunch style that are awesome as well.

Lastly the presets are really good. The Creamy Lead is beautiful!

Super happy with this purchase.

C. Santillo

January 24, 2021

Best high gain amp. Period.

Great tones, heavy distortiion, great sustain. Amazing amp.

C. Santillo

January 24, 2021

Best high gain amp. Period.

Great tones, heavy distortiion, great sustain. Amazing amp.