Now, this only happens when I'm using one of the channels(I forgot which one), when I shut off my amp without switching to the other channel it makes a loud POP! Is this a capacitor unloading? A filter that needs replacing, or something else. I can do the electronics work myself,if someone could give me a clue as to what needs to be done. I've got all the schematics and layouts downloaded from this website and put on a CDR. Thanks. Baggman.