Graphic Fuzz?

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Joined: 2008-02-05
Graphic Fuzz?

Hello! Anyone ever come across the fuzz box that ESR made? I found one on eBay awhile back; it has controls for volume and tone filter. Weird thing is, as the filter is turned up past half-way, it starts to oscillate. Did they design it this way? Or does the fact that all the caps in it are ceramic and old? To that end, I've recently been updating the circuit with modern components to see if I can get the filter to be more stable. The whistling is cool and all (in an Electro Harmonix "How high WERE they?!?" kind of way...), but I'd like to make it more usable, as the distortion it makes is very cool and unique. Any info anyone can dig up would be great!