Korg Nu:Tekt TR-S Power Tube Reactor and HD-S Harmonic Distortion review

You won’t put assembly-line workers out of a job, but you will get some cool sounds from Korg’s Nutube-powered pedal kits

Korg Nu:Tekt Harmonic Distortion
(Image: © Future / Phil Barker)

Guitar World Verdict

Korg has cleverly gone beyond the traditional dirt pedal paradigm with these Nu:Tekt offerings, delivering alternative options that are both innovative and practical. Oh, and nice stickers, too!

Pros

  • +

    Nutube technology gives authentic valve-like response.

  • +

    Solid construction.

  • +

    Practical size.

  • +

    Innovative design.

Cons

  • -

    We don’t quite get why these are called ‘kits’.

  • -

    On-the-fly adjustments are not practical with trim pots.

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Sold as ‘kits’, the self-assembly aspect of the Nu:Tekt TR-S Power Tube Reactor and HD-S Harmonic Distortion is actually limited to screwing on the bottom plate, sticking four rubber feet on and putting the knobs in place, with the addition of a sheet of stickers to ‘customise’ your pedal. 

That far-from-difficult aspect aside, each pedal looks a most interesting prospect based around Korg’s Nutube, which, the company says, operates exactly as a triode vacuum valve. Besides a set of four knobs, each pedal has three front-panel trim pots to adjust various parameters.

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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.