I've got a new noise coming through both of my amps in the last week. It's a repetitive tapping-type noise, for lack of a better description. It's a repetitive 'tat-tat-tat-tat' at pretty much exactly 180 rpm. On a 30 second timer, I counted 91 "tats" lol. There's no ceiling fan going so that's out of the question. I haven't started shutting off circuits in the house to see if it stops, yet. Probably won't get to attempting to diagnose it until tomorrow. I just thought I'd post up in case somebody might have seen this before or something similar. Any ideas? Anybody had something like this happen? Thanks.