Unless it was a sheer co-incidence and the cause was a power spike from your mains supply? I assume no other sign of any other electrical items playing up from around that time?
Does your wife wear synthetic slippers? Could have shuffled up a sizable static charge?
How old is the Cyrus amp? Could it have beed the victim of a failing PSU (dodgy caps) which in other equipment has been known to fry other of its components such as hard drives?
