A week or so ago on the very awesome AudioCookbook blog, there was a post about Old Amplifier Abuse that reminded me of an experiment from a few years back conducted by Arthur, Micah and I using an old Crate amp head with a spring reverb. As luck would have it not two days later while recording some test drum takes Micah asked whatever happened with that stuff, so I dug it up.
We exposed the spring in the reverb tank, plugged the output into a short effects chain (Distortion stomp box, and a Boss SP-202 for ring mod and filtering), then plugged it right back into the input. The speaker outs we plugged in to some speakers, then mic’ed the setup. We recorded 30+ minutes of the most undisciplined noise, banging on the spring, attaching crap to it, and twisting knobs on the filters. This created feedback loop of oscillations, with the occasional bang as someone threw a drumstick at the spring tank. It reminds me of some industrial experiment gone wrong, with the crash of toppling, derelict factory equipment in the background. Here are a few clips.
NOTE: These samples might be quite loud and obnoxious.