T-Rex Karma Boost review

T-Ransparent boost pedal

  • £149
  • €199
  • $249
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Our Verdict

It's no chameleon, but it'll boost your tone with subtle colour.

Pros

  • Variety of boost and character - clean boost to a pleasing edge.

Cons

  • Fans of snarling tones should look elsewhere.

There are loads of boost pedals around at the moment, some offering tonal adjustment as well as boost, but on the surface T-Rex's Karma Boost looks as simple as it comes, with just a single knob that can deliver 16dB at full whack.

The pedal, though, offers non-linear boost so that the character of the sound will change at different knob positions.

"At around a 10 o'clock setting there's a nice, subtle lift that works well, transparently giving a driven amp a bit extra"

With the control knob set to minimum, there's no apparent boost at all, but at around a 10 o'clock setting there's a nice, subtle lift that works well, transparently giving a driven amp a bit extra for solos.

Further advancement of the knob gives you more of this, with a pleasing edginess and presence easing in at higher settings.

That extra presence is also there when used with a clean valve amp: the Karma boost won't turn it into a snarling monster, but it will drive it into a useful degree of breakup.

A tasteful booster with the added advantage of a buffer to make up for long cable runs.

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Tech Specs

Country of OriginChina
Battery/Adaptor Type9V Battery Nine-volt mains adaptor
FeaturesFET bypass