So simple yet so destructive, the Earth Sound Research Graphic Fuzz is definitely worth a go.

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So simple yet so destructive, the Earth Sound Research Graphic Fuzz is definitely worth a go.
1976 Earth Sound Research Graphic Fuzz Pedal
via eBay [auction ends 08/16/11 at 12:12:16 CST]
FROM THE AD:
Offered for your consideration at NO RESERVE! Uber Rare! Earth Sound Research Graphic Fuzz pedal! This is one of the coolest sounding fuzz pedals I've ever had and I've had well over a hundred of them. I luckily own two, so I'm selling a spare. It's an opamp-based fuzz,with an active bandpass filter that gives you a cocked wah voiced output. It is absolutely the BEST BASS fuzz out of all the ones I've owned. Just killer tone and grit! There are a couple reviews online but they don't do this pedal justice! Dial in fat round tone or thin it out by by rotating the filter knob. I use it with a parametric eq in front of it and a delay or phasor behind it for awesome bass sounds! Don't let this one get away!