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 2 responses by roberjerman

An appearance of hum in old equipment is most likely due to aging power supply capacitors! An easy and affordable fix!
@jea48 : The difference in ground voltage potential between the two halves of an ungrounded AC cord is usually trivial and not a cause of sudden hum!