My A.C. line voltage regulator model AR-1215 is producing a hum that does not sound threatening nor dangerous, but seeing that my furman PL-8 makes no noise I know something is up. It sounds like when you leave a cable unplugged or when an amp is just huming along. I wanna know if it's safe to keep using or if there is anything I can do with it. I also don't know how to post audio, so if anyone can help me find that out I can post some audio of it