Crazy Tube Circuits Unobtanium review

Dumble and Klon-inspired tones united in one awe-inspiring overdrive pedal

Crazy Tube Circuits Unobtanium
(Image: © Future / Olly Curtis)

Guitar World Verdict

A versatile dual-drive pedal that will provide classy enhancement for your amp with flexibility of operation that runs from a transparent boost to full-fat overdrive.


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    Two sought-after sounds in one pedal.

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    Effects loop.

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    External footswitching facility.

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    Compact size for a twin footswitch pedal.


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Among all the rare gear that goes for silly money and deserves the ‘unobtainium’ moniker, an original Klon Centaur and a Dumble guitar amp are prime contenders. So how about a dual-footswitch drive pedal (for around $300) that aims to deliver the tonal essence of both?

On the left side you get the D-style sounds, and on the right there’s the K-type. Normal signal flow is the K feeding the D, but there’s a send and return loop for routing flexibility, inserting other pedals between the two, or having them as independent effects via a switcher. 

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Trevor Curwen

Trevor Curwen has played guitar for several decades – he's also mimed it on the UK's Top of the Pops. Much of his working life, though, has been spent behind the mixing desk, during which time he has built up a solid collection of the guitars, amps and pedals needed to cover just about any studio session. He writes pedal reviews for Guitarist and has contributed to Total Guitar, MusicRadar and Future Music among others.