Yesterday evening, our house power flickered on and off about 5 or 6 times over about a 2-second period. Our power is absurdly inconsistent and often goes out without any apparent cause, but this was the first time I recall it ever hovering on the edge for that long. Still, it’s bad enough that a few years ago we invested in a whole-house surge protector. Prior to that we’d had to replace our well pump CPU control panel, twice.
Anyway, when this happened, I immediately ran down to the listening room where everything had been left on. The P500 was showing “HOT” in its display, something I had never seen before, so I shut everything down as quickly as I could.
On rising this morning, I went down and powered the system back up, and everything seems to be working - all components are getting power and are operating normally, the P500 is back to its “AUTO” display, and the sound of the system seems unchanged, or at least as much as I could tell from low-level 5:30 AM volumes.
But as I turned off the music to leave the room, I heard a buzzing I hadn’t ever heard before, faint, but definitely audible, and as near as I can tell, it seemed to be coming from the P500. I’m not talking about an electronic hum from the speakers, but a low-level mechanical hum or buzz like a fluorescent light ballast in another room. I should say it’s possible this noise was there before, but it seems unlikely that I wouldn’t have noticed it at all in the years I’ve been using the device. Since I had to leave for work, I shut everything down again. I wasn’t about to leave it on with no one on hand to monitor things.
I guess my question, for those who know the P500 and electronics better than I (which wouldn’t take much), does this sound like something that could be caused by a second or two of rapid on/off line voltage cycling, and if so, is it something to worry about?