2. amps-preamps
  3. 1275515892

Amplifier HUM

About 6 months ago I completed building a pair of AudioNote 300B parallel mono block amps. I love the sound, but hate the hum I'm hearing from 15+ feet away. I have gone over and over the circuit, changed the location of wires, re-soldered many points, and done the usual things such as lift the ground wire, and some unusual things such as purchase a PS Audio Humbuster. NOTHING eliminates the hum, or even reduces it. The hum emanates from the mains transformer, and combines with the speaker to produce a most annoying situation. I am using PHY speakers mounted in an open baffle. I don't seem to be as annoyed when I use a "box" speaker. The PHY has a pizzo tweeter, and I've read that that can upset some transformers, but I've disconnected the tweeter, and the hum persists. Any thoughts will be appreciated. Again, I love this speaker/amp combo, but am about to shelve the amps. Thanks.
dawg
viridian's avatar
viridian
4,184 posts
 
I have no idea what this means, "The hum emanates from the mains transformer, and combines with the speaker to produce a most annoying situation."

Is your hum mechanical noise from the transformer, or is it being amplified and coming from the audio chain through the speakers? Or is it both?
jtwrace's avatar
jtwrace
425 posts
 
WOW! This makes two of us. I'm pulling my hair out...

I've done everything that I know of. I even had the electric company put a recorder on my incoming electric line to make sure there isn't something strange there.
tvad
9,467 posts
 
Have you discussed this with AudioNoteKits? I know there is a USA representative. Perhaps you can send them to him to troubleshoot and repair.
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