Review: Evil Tweaker One Knob Fuzz

Over the last year or so, the name “Evil Tweaker”, has become quite popular with custom and boutique pedal collectors. It’s a name that rings quality, creativity, and tone. Of course, we can’t forget about the picture perfect paint jobs that set his pedals apart from anything else on the market.

Each company has what they would consider to be their flagship product. Whether its Ibanez’s Tube Screamer, a Fender Stratocaster, or a Mesa Boogie rectifier, it’s the products that have helped solidify their brand as much as the name. For Evil Tweaker, the One Knob Fuzz is that product.


In the beginning, The One Knob Fuzz was Evil Tweaker’s first step into the realm of boutique pedal building. Since then, he has gone on to build a wide array of pedals. Anything from Line Buffers and Delays, to Loopers and Reverbs, he continues to push the boundaries of his madness.

Recently, Evil Tweaker created his first production run of his flagship One Knob Fuzz, and we were lucky enough to get out hands on it first!

First, let’s get you some of the basics

The Evil Tweaker One knob Fuzz:

  • Silicon 2089 transistor
  • Germanium clipping diodes
  • True Bypass switching
  • Bass cut switch
  • Neutrik jacks
  • Runs on standard 9V power supply

What did you expect? There’s only one knob!

The Build:

On the outside, the One Knob Fuzz is exactly what one would expect. It has a footswitch, input, output, bass cut, white LED, and of course, One Knob. It’s about as simple as it gets. However, as we all know, it’s what’s on the inside that counts. For this build, Evil Tweaker uses a silicon 2089 transistor paired with Germanium clipping diodes. And, much like his custom paintings, his point to point hand wiring is second to none.


Speaking of hand painting, we have all come to love Evil Tweaker’s ability to take a paintbrush and turn a standard pedal into a true work of art.  While we may not get custom paintjobs on these new production run One Knob’s, they still have the hand-made touch with the word “Fuzz” being painted on in black against the solid white backdrop. But hey, modern art went through a minimalism phase too.

One of the most exciting things about this pedal is that Evil Tweaker has included a bass cut switch. This is a great extra feature that adds a little more versatility that was not available on previous models of the One Knob. But we’ll get to more on that in a second.

All in all, it’s a solid build. The aluminum metal casing will be more than capable of withstanding even the heaviest of metal (see what I did there) and the rest of the pedal is built to be stepped on. Even though these are a new production line, they still maintain the hand built quality of a boutique pedal. Plus, if it breaks, we’ll give you Mr. Evil Tweaker’s home address and you can go see him personally…Tell him Tone Freqs sent ya.


The Performance.

We all have pre conceived notions on what we want out of a fuzz pedal. Some of us want a subtle distortion to help create a little extra bite, and others may be looking for something that resembles a blown tube amp. The Evil Tweaker One Knob does a nice job at finding its own spot on the fuzz spectrum. Below is a series of sound examples of what the One Knob Fuzz is capable of producing. These examples are meant to demonstrate the overall effect this pedal will have on your tone, as well as, showcase additional features of the One Knob Fuzz.

 Gear used for these examples:

  • Diezel Herbert – Clean Channel
  • PRS Standard 22 – Dragon II pickups
  • Evil Tweaker One Knob Fuzz
  • Audix i5 microphone
  • North Eastern cable company guitar cable

This first example is a dry signal into the clean channel of the Diezel Herbert. This example is to showcase what the amp and guitar combination sounds like without any effects.

For the second example, I play the same open chords as in the previous sound clip, however, this time the One Knob Fuzz is engaged and turned all the way up with the bass cut switch off. Notice how much of a significant difference there is in the signal. Unlike other fuzz pedals, the One Knob still maintains a certain level of clarity between each open chord. I also really liked the amount of sustain this pedal provides to your signal.


This next example is the exact same thing, only this time the bass cut is engaged. Listen closely as the bass cut switch cleans up the low end and balances out the overall frequency.


In this next example, I dialed the fuzz back to about halfway to showcase how responsive the fuzz knob is to the overall signal. The bass cut engaged for this example. I was really pleased with how well the signal cleaned up and responded to the adjustment and maintained articulation.


For the next set of examples, I wanted to showcase a style of playing that we most attribute with a fuzz pedal. This first example has the fuzz turned all the way up with the bass cut engaged. Listen to how warm and round each power chord sounds. Also, notice how the bottom notes have a bit more clarity and distinction to them.


Same playing idea, only this time the bass cut switch is off. Take a listen to both examples and see if you can hear how much of an impact the bass cut switch has on the signal.


These next two examples are sticking with the same playing style, only this time I wanted to break up the power chords a little bit so you could hear the reaction of the signal. This first example is has the fuzz knob turned all the way up with the bass cut switch off. Pay attention to the lower notes and their definition between each example to understand the impact of the bass cut.


And here is the same idea with the bass cut switch engaged.


For these next two examples, I wanted to showcase how much of an impact rolling off of the volume on your guitar can have on the signal of the One Knob even when the fuzz is turned all the way up. I also wanted to demonstrate how you can capture smooth, warm, creamy solo lines with the One Knob Fuzz. The first half of each example has the volume on the guitar rolled back halfway and then rolled up to full volume for the second half. This first example has the bass cut engaged.


Now with the bass cut turned off.


Finally, in this last example, I wanted to demonstrate that this pedal is more than capable of providing you with enough fuzz to get as heavy as you want. I tuned the guitar to “Drop D” for this example and had the fuzz turned all the way up. I did not have the bass cut engaged, so pay close attention to the response of the lower notes.


As I mentioned above, we all have our own ideas of what a fuzz pedal should sound like; however, The One Knob fuzz does a solid job at providing you with a nice, warm, fuzzy tone. While the bass cut switch may be subtle, it’s effective. Compared to previous models of Evil Tweaker’s One Knob Fuzz, this one is by far the best yet. Whether you’re looking to get heavy, or simply add a little extra bite to your tone, the One Knob should more than have you covered.

While I am incredibly impressed with this pedal, I would like to point out one aspect that others may not find appealing. While simplicity is the name of the game with the One Knob, some may be looking for more fuzz options. Other than that, anyone should find this One Knob more than capable of solidifying a spot on their pedal board.


  • Smooth, warm, full tone
  • Not too harsh
  • Responds well to pick attack
  • Simple to use


  • May be “too simple” for some players

Tone Freqs User Rating: 9.6 out of 10

Price: 129.99 – Available at American Guitar Boutique.

Honestly, what more could you want out of a fuzz? It’s smooth, warm, articulate, and full of character. Plus, you only have one knob to worry about! If you’re looking for a production pedal, with the hand built touch, then we highly recommend you check out Evil Tweaker’s first production run of the covenant One Knob Fuzz. We promise you won’t be disappointed.

Make sure to stop by Evil Tweaker’s Facebook page and give him a one up! Tell him Tone Freqs sent ya!


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