Review: Gurus Amps Sinusoid



Italy is fast becoming one of the top countries for tone hounds, thanks to the ever-growing number of cool Italian guitar amp and effects companies.

One such company is Gurus Amps from the town of Faenza, about halfway between Bologna and Rimini. Gurus makes both amplifiers and effect pedals, with their valve-driven Echosex analogue echo pedal probably being their best-known product.

Gurus Amps’ Sinusoid (price in Finland: 479 €) is another cool design, which seems both anachronistic and up-to-date at the same time. The Sinusoid is a paperback-sized effect pedal, offering you two valve-driven analogue effects in a very compact format — optical tremolo and genuine spring reverb.

The Sinusoid is sold without a power supply unit. This double pedal’s power input can handle DC between nine and twelve volts, and its polarity follows the well-established Boss-standard. Be aware, though, that this Gurus effect is relatively power hungry, requiring anything from 230 mA to 400 mA, which means running the Sinusoid off a professional pedalboard PSU is strongly advised. The effects unit worked fine with Kitarablogi’s Cioks PSU.

The Gurus Sinusoid is equipped with mono in- and outputs – you can plug your guitar (or keyboard) directly into it, or run the effects pedal in an effects loop.

The Sinusoid is loop-switcher-ready, sporting a remote control input jack in the upper left corner.



Guru Amps’ Sinusoid is extremely easy to use:

Each of the two effects comes with its own footswitch, two control knobs, as well as a green ”Magic Eye” indicator.

On the optical tremolo side the indicator light gives you the speed of the tremolo effect. The spring reverb’s ”Magic Eye” tells you how hot you’re currently driving the reverb tank’s (manufactured by Accutronics, by the way) input stage (using the Volume control). It is possible to overdrive the reverb circuit, should you wish to achieve extreme Surf or Rockabilly effects.

The Sinusoid’s name has been taken from its very musical tremolo circuit, whose modulation uses a sinusoidal wave generator. The Intensity takes you from completely off to quite choppy, with an ample range provided by the Speed control, too.

This clip gives you an idea of the range of tremolo effects offered by the Gurus pedal, when plugging a Fender Stratocaster into its input:

My first thought at realising that the Sinusoid incorporates a genuine spring reverb was ”These Italians must be nuts!”, but I must confess that the pedal has quickly won me over with its classic tones. To my ears, the pedal’s spring reverb sounds a tad less dense, rich, and wet, when compared to something like a Fender Blackface Deluxe Reverb. But when you remember that the Gurus Sinusoid is far smaller than a full-sized reverb tank, you will have to admit that the sound quality offered here is truly astounding:

Here’s a short clip of both effects running at the same time:

I already mentioned this before, but Gurus Amps’ Sinusoid also works very well, when used with a keyboard. This is why I’ve recorded the demo track’s keyboard and guitar parts using the effects pedal:

In and of itself the Gurus Sinusoid works wonders in delivering genuine vintage-sounding tremolo and reverb effects in a compact and easy-to-use format.

There is one thing worth considering, though, and that is the effect’s working environment. Due to the way a spring reverb creates its magic – namely by means of vibrating metal springs – all reverb tanks are susceptible to mechanical shocks, at least to some degree. Normally, a spring reverb tends to be safely tucked away at the bottom of an amplifier cabinet, but the Sinusoid is meant to be mounted on your pedalboard and switched on (and off) by foot. Depending on your stage volume and/or the vivacity of your showmanship, accidentally kicking the Sinusoid (or switching the reverb on very forcefully) will inevitably lead to audible spring reverb rattling (sounds like distant thunder). I’d recommend using some type of shock absorption when mounting the Sinusoid to your pedalboard, if you want to minimise reverb rattling.

In my view, Gurus’ Sinusoid is a great two-in-one pedal that scores high in the vintage tone and coolness stakes. Sure, you can get nice-sounding digital models of tremolo and spring reverb effects for less money, but the Sinusoid is the real McCoy!

Gurus Amps Sinusoid


Finnish distribution: NordSound


+ two genuine valve-driven effects

+ sturdy built

+ compact format

+ sounds

+ remote switcher compatible


– spring reverb susceptible to mechanical shocks










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