2. amps-preamps
  3. 1016485698

Amplifier Hum

Hi, I have a Parasound HCA 2200 II that has started to make a humming noise. The noise is coming from the amp itself not the speakers. It just started doing this but still seems to function fine. Previously it was dead silent. The amp has about 3 years of use on it. My question: Is it time to sent to Parasound for a tune-up or is there somthing I can check myself? (the amp is not under warranty as I'm not the original owner) Any help would be greatly appreciated.
Thanks
skeevay

Showing 3 responses by garfish

garfish
1,840 posts
 
.......could also be as a result of changes in your local power supply. My McCormack DNA2 amp hums occasionally (fairly loudly), and after long conversations with Steve McCormack (the amps designer), and upgrade to Rev. A, we have concluded that the hum is caused by variations in local power supply-- nothing we can do about it except to complain to the power company. I did, they replaced the transformer I'm on, and the amp still hums occasionally. Good Luck. Craig
garfish
1,840 posts
 
John; The Rev. A upgrade sounds fantastic on music-- but still the nagging hum problem. As I need to have an electrician come out anyway, I'll ask him to check phase as you've suggested. Thanks. Craig
garfish
1,840 posts
 
John; Yep-- the upgrade is worth it, IMO. After upgrade to Rev. A the amp has an incredible smoothness, liquid character, and naturalness that could be described as "tube-like" in the mids and low treble, but it still has the quickness and bass control of a big McCormack amp. Very musical. Cheers. Craig
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