Vox Valvenergy Mystic Edge, Silk Drive & Copperhead Drive review

A trio of valve-powered drive pedals that use a Nutube for an old sound

Vox Valvenergy
(Image: © Future / Neil Godwin)

Guitar World Verdict

With their musical drive and clever feature set, the Valvenergy series is a practical solution for adding another amp flavour in your signal chain, with the Silk Drive edging it for its versatility.


  • +

    The Mystic Edge nails the AC30 character.

  • +

    It can be used in preamp mode.

  • +

    Copperhead is a super-practical Marshall in a box pedal.

  • +

    The Silk Drive makes an excellent always-on sweetener.

  • +

    Onboard cab sims.


  • -

    Nothing, though the OLED is for decoration mostly.

You can trust Guitar World Our expert reviewers spend hours testing and comparing guitar products so you can choose the best for you. Find out more about how we test.

The Valvenerergy pedals, each based around a Nutube miniature vacuum tube in its all-analogue signal path, are designed to emulate the response and harmonic distortion of a tube amp

Four popular amp types are represented, in order of increasing gain: Silk Drive, Mystic Edge, Copperhead Drive and Cutting Edge. 

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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.