Today I dropped it off at the local authorized service center who has been the only company to work on my amp. Interesting thing, without opening the cover, I put my ear real close to the vents adjacent to the transformers, there are two, one on the left and one on the right just behind the front panel. I could swear the hum sounds slightly louder from the right side making the right side transformer suspect. I used an analog decibel meter using fast and slow response, and it's hard to tell with the slightest ambient sound pressure. It measured approximately 55 dB with the right side maybe 1/2 - 1 dB higher. Are my ears that good? the proof will be in the pudden when the shop gets into it. The owner said he would get in early when it's dead quiet and listen for the hum.
I told him today that the hum is loudest when power is initially applied then quiets down however, I can still hear the hum from 10 ft away when the room is quiet. Of course when a program is playing, the speakers drown it out so It's inaudible. My Integra DTR-50.3 AVR, $700.00 retail has always been dead quiet. Certainly a $4000.00 retail Anthem A5 amp should be as well.
Lets see what they say in a couple days. Stay tuned!
