Gurus Sinusoid Tremolo & Reverb  in excellent condition with box.

The Sinusoid offers a choice of two independent effects,
with the option to use them separately or combined.
A tube circuit drives the reverb and tremolo,
producing authentic vintage effects with the classic
warmth associated with vintage amplifiers.
To create a truly 100% analog reverb circuit,
Gurus Amps teamed up with Accutronics to develop a
dual-spring tank that perfectly reproduces the tone, feel,
and response of vintage spring reverb units.
The optical tremolo was achieved by combining a
unique sinusoidal wave with Gurus' proprietary technology.