Crazy Reverb Sounds
From: Angus MacLeod
This works with mine and one of my friends amps, however they are both laney valve state amps, so it may not work for everyones. Using maximum distortion sounds best. Turn reverb up all the way on the amp and hit the top of it with the palm of your hand. Dont break it, just give it a pretty hard tap. It should produce weird warbles and spacey type sounds. Could be a cool stage stunt if you use your guitar to hit the top of the amp instead of your palm.
Also, Evan Price sent in this little FYI to the site -
I just thought I'd explain the reverb trick. It does this because it's a spring reverb (using a spring to create reverb). So when hit your amp, it causes the spring to move and cause noise. Thank you much!