2. amps-preamps
  3. 147229-125544

Audire Diffet 1 hum

My Audire Diffet 1 preamp recently developed a hum audible through the speakers. Still sounds very good at volume, but probably like all of you, it bothers me. Could it be a transformer, capacitor or otherwise?

PS Audio had a nice article on isolating a hum, but didn’t mention the possibility of equipment. I guess my question is it probable that the problem is external to the preamp, like interconnects, or line voltage? (My other system doesn’t have a hum).  Oh, and it produces a thump when the amp and preamp are turned off together (I don't do this anymore).
ballyroebuck

Showing 6 responses by ballyroebuck

ballyroebuck OP
12 posts
 
https://drive.google.com/drive/folders/1iabF03nHOOo5c5FKi6I9WhmZ-3XMlsrl

See if you can open this.  There is a little button cap right across the wall power in the preamplifier.  If it is a capacitor, I'm hoping this is the issue.  What do you think?
ballyroebuck OP
12 posts
 
Great information Elizabeth.  Thank you and I'll give your recommendations a try.  Even with the hum, it is a sweet sounding preamplifier, so I wan't to keep it in use.
ballyroebuck OP
12 posts
 
Plugged into the same outlet:

I disconnected the only input, a CD player, and the hum is present, at the same level.. 

I also tried disconnecting the preamplifier to check the amplifier. The Audire Model 2 is quiet, no hum. 
ballyroebuck OP
12 posts
 
Audire is long gone, unfortunately.  
ballyroebuck OP
12 posts
 
It sounds like a 60Hz hum and its constant, does not vary with volume.  The Audire amplifier and preamplifier are both old enough to have just a two prong electrical plug. 
ballyroebuck OP
12 posts
 
https://drive.google.com/file/d/0B1IJAr37espZRWM1XzROakoxaVlaMi1vaVVXSERtWm9TcFE0/view?usp=sharing

https://drive.google.com/file/d/16oF4xhFjhYAEpxg-rBoKheJXNYrQrV2W/view?usp=sharing
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