I was rewiring my gear last night and heard a hum coming from my mid-range driver. I was used to this but surprised how loud it had gotten, and it usually went away...presumably after some parts warmed up (especially the tubes) but this time it stayed. Long story short, I found several loose screws holding key parts in place, tightened them, and the hum went away. I'm afraid to turn the amp off in fear of the hum coming back, but as of now the speakers are dead quiet.
Amp Hum
I've got a B&K AV5000 Series II amp with a hum. It gradually builds up over about a 5 second period on startup. I've disconnected everything (preamp, speaker cables) and still the hum persists. I tried a different power cord (Shunyata Sidewinder), made sure everything else was off, tried a cheater plug, different wall socket... still have the hum. I tried the Monidal Magic thing for the cable, still the hum torments me. Is it time to take it in or am I missing something? Thanks-