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User reviews on Diezel products

The Diezel VH4 may be the last amp you'll have to buy. (VH-4)

By racerevlon, 07/12/2012
The Diezel VH4 is an all-tube monster amplifier that can deliver between 90 and 160 watts of power, depending on what tubes are in it. Over the years the amp has come stock with different tube complements as owner/designer Peter Diezel worked through reliability issues with tube manufacturers and tone requests. It's my understanding the amp used to come with 6550s, then was switched to EL34s for quite a while, and now ships with KT77s. The thing is, it doesn't matter. Any tube in this amp works equally well, it's just all about the tone you're looking for.

The VH4 has four channels that go from spanking clean to brutally-saturated over-the-top gain madness. Each channel has an independent Volume, Gain, Bass, Middle, and Treble control, and are also global "Deep" and "Presence" controls. The VH4 has both a serial and parallel effects loop, as well as a channel insert for each channel. All of these are controllable via on-board MIDI, including a global Mute function. Both channel 1 and channel 2 have a "bright" switch to further shape your tone.


It's actually hard to get a bad sound out of this amp. Go ahead, try. Once you get used to the diagonal layout of the knobs per channel, the amp is fairly straightforward. Set your channels where you want the sound, program the MIDI if you want, and go play 'till your heart's content. The Manual is clear and simple, and Diezel customer service is second to none. Peter Diezel himself will personally answer customer service questions and help people, even those who have purchased second-hand, get the best tone possible out of their Diezel amps. The manual goes into fairly deep detail, for example, going so far as to point out in what frequency ranges the "Deep" and "Presence" controls work and affect (80Hz and 4Khz, respectively).


I mainly play Dimarzio equipped Neal Moser guitars, Ibanez guitars, and George Riszanyi custom guitars through all of my amps. This amp is simply a monster. Channel one is the "clean" channel and can get you warm jazz tones to country spank, all based on how YOU decide to set the amp, and with the gain cranked starts to get you into the dirt. Channel 2 can overlap with the lower region of channel one but as you increase the gain you run the gamut from gritty blues to 70's rock to 80's metal. Once you hit channel three you've entered the signature "Diezel" sound and the amount of gain on tap is staggering. With the gain lowered, you can keep the 70's/80's vibe and have the signature Diezel sound, or you can push the gain up and have saturated bliss. Channel four is simply over the top. Fluid high-gain is what's on the menu here--punishing rhythms and singing leads are nearly effortless. Whatever sounds you want, the VH4 can serve them up, including everything you want to hook up.


This is one of the most well-made and sturdy heads I've ever owned. It also weighs a ton. Make no mistake--this is a serious piece of hardware and the price tag reflects it, but if you're looking for that "all-in-one" amp the Diezel VH4 just may be the last amp you'll ever have to buy. If something were to happen to mine, I would without a doubt have another. This is definitely an amp you don't want to be without.

100% Diezel (Zerrer)

By madchap, 30/07/2015
This is a FET preamp fitted with 2 individual channels (Gain, Treble, Middle, Bass, Volume). It also offers a presence and a deep control, and a master volume, All 3 knobs are shared by the two channels.
The preamps comes with no manual and a somewhat cheapish power adapter. One may think that someone is trying to cut down costs and boost profit at Diezel... if we didn't know better!:-D
The aluminium body is thick, sturdy and quite bulky, and yet the preamp is rather light (1.3kg). The Zerrer offers no less that 6 kinds of outputs so most situations should be covered! We have a "amp in", a "poweramp in" that can also be used as a "stereo FX loop" (send/return), a "compensated output" (w/ cab sim) for mixing desks, a headphones out (ofc w/ cab sim), an external footswitch control in case we want to trigger the Zerrer from a distance, and finally an "auxiliary in" with two independent volume knobs to plug in our MP3 player or other sources!

The Zerrer is a true bypass preamp, but when activated sound only goes through when connected to the "amp in" output...which is obviously when we need it! Otherwise the bypass footswitch is used to mute the preamp.
I'll be honest I think the preamp LOOKS pretty bland and common...knobs are not of the Diezel type and the overall design could easily be improved but, hey, aesthetic is only second to tone! And in that department the Zerrer delivers big time!

If you're already familiar with Diezel amps, clean/crunch channel is from D-Moll and lead channel is VH4 (channel 3)
If you're not, let's say that gain-wise channel 1 goes from a Fenderish or JC clean type tone to a big crunchy JTM or JCM800+. You can dirty the clean channel VERY progressively. Channel 2 more or less picks it up from there and brings us into high gain territories. Think VH4, Herbert or 3x Rectifier (the amount of gain, not the tone!).

Tone-wise, the Zerrer brings us Diezel signature sound. It's extremely sensitive to attack and picking styles (just like a real good quality TUBE amp, no less!), and of course the guitar you'll plug into it will greatly influence the tone. Honestly it's so impressive to hear how responsive it is that I need to mention it once more! I've had many preamps and amps over the course of the last decades, and this one ranks at the very top for sure!
Depending on how high you set the channel volume, EQs will be relatively or extremely sensitive. Basically if channel volume is full on, the tiniest turn of a knob has a huge impact on the tone. When channel volume is set at noon, it is more what you'd expect from a standard amp or preamp.

It is only my opinion but I believe the Zerrer needs to be plugged into a sort of poweramp. I use a torpedo and the combination of the two is terrific! I also tried to plug the Zerrer into Recabinet 4 and it sounded pretty good, though not quite as good as into the torpedo. The Headphones out in comparison sounds like plugged into an IR file. When I first used it I found the tone somehow lackluster. Mind you, it's quite decent and pretty usable and useful when on the road for sure, (and better than any mass-market modeler out there!) but still, we're a far cry from what a "fully fledged" (so to speak) Zerrer can deliver!

My previous preamp was a Mesa boogie V-Twin (good tone, but definitely not as versatile as the Zerrer) The Zerrer is definitely as responsive as the V-twin, even more actually IMHO. I have also owned a Herbert for several years (the first models) . To very briefly compare the two, the Herbert is way more versatile than the Zerrer, and is also voiced slightly differently, so the Zerrer can only mimic a fraction of what the Herbert can do, but it's not all that bad, as with a bit of extra EQing, I can get close enough anyway ...and it's way more convenient to carry around than a 30kg head and a 4x12!! But Peter, if you read me, we also need a Herbert preamp! :-D

All in all, I'm very pleased and satisfied with the Zerrer. It is a frigging great piece of gear that delivers an awesome tone, plus, it's portable and very versatile. Once more Diezel puts out an excellent product on the market and above all one that should disappoint none! It's small in size but delivers big time! If you're looking for a high quality and portable preamp at an affordable price, just grab one, you just can't be disappointed!

you can hear it on my souncloud page (mostly metal stuff though):

News Diezel

[NAMM] Diezel Zerrer to make debut at NAMM

Published on 01/16/14
Diezel Zerrer pedal to see the light of day at Winter NAMM Show 2014.

[Musikmesse] Diezel Hagen

Published on 04/07/11

Diezel Creates US Branch, And More

Published on 01/08/09