Make certain the power cords are plugged in polarized. The Half of the cable with the grooves is the negative; the smooth one, the positive, i.e. small hole. I had a Diffet 1 and a Model 2. Hum can be caused by nearly invisible corrosion on the internal wiring, especially at the neutral. Don't ever run an input to this Amp more than 3 feet long. It picks up RF waves from radio broadcasts. As a real Rocket Scientist for the Apollo missions, Julius did not originally owner misuse. That is why the Model 2 got clipping indicators added. He also did not consider that people could plug in things backwards, and added the three prong, grounded plug with the Forte.
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).
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).