I'm looking to have preamp out of an amp that doesn't have a line out(or a loop). Or some other device that serves this purpose? I'd like to have a box of some sort that I can run from 1 speaker out on an amp head -> the box in question -> some reverb and delay(sometimes) -> a tube power amp. I suppose I should verify both the head and power amp will be plugged into speaker cabs at all times. Anyone who's done this, I'd greatly appreciate your input. Wasn't sure where to put this thread, mods if it should be in FX section, please move.