I was wondering if someone could give me a circuit for a reverb unit? I would prefer to build a tube one but does this mean I'll need mains power? Or does someone have a schematic for a IC based unit. (I think the holy grail is one?)
For an easy reverb you shall require a reverb tank! check www.accutronicsreverb.com for info on reverb tanks. You could also do it with BBD's but it won't sound as natural.
The problem with a reverb tank is that it's large, and every time you move or shake the tank you get a clang-boing sound out of it, meaning that you'd have to make this effect rack-based or something similar.
http://www.solorb.com/elect/musiccirc/reverb2/