Walrus Audio Eras Five-State Distortion and Iron Horse High-Gain LM308 Distortion review

A duo of high-gain distortion pedals with a twist

Walrus Audio Iron Horse and Eras
(Image: © Future / Olly Curtis)

Guitar World Verdict

The third-generation Iron Horse improves upon the original with a continuous dial for adjusting clipping, making for a hugely versatile distortion that has that gnarly LM308 Rat tone lurking within. With its five switchable clipping modes, the Eras is similarly tweakable, with a superb onboard EQ.


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    The Eras presents a wealth of powerful EQ options.

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    Both pedals offer a wide range of drive sounds.

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    Iron Horse does vintage Rat tones with adjustable clipping.

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    Top-mounted jacks.

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    Soft-relay switches.


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Recently introduced by Walrus Audio, these two new US-made distortion pedals are no one-trick ponies, as each provides varying flavours of distortion via clipping from silicon diodes, LEDs or both together. 

However, each takes a different route to dialling it in. The Eras features a five-way rotary switch to select LED and silicon-based modes, while the Iron Horse has a rotary knob that morphs from silicon to LED, for a continuous range of blends between the two extremes. 

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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.