The hum on my amp associates with the attenuator. On some positions, it’s quiet and in other positions the hum is quite disturbing. I’m using the Alps RK27. Could that be something similar to you?
Have you got the way to align them? Actually it's very easy. You select the objects you want to align. Then you click on the align button on top of the screen. You'll then see the black dots with lines on your parts. Click on those dots and your parts will be align accordingly.
The easiest way to confirm the problem is that you try someway to ground the amp. If the hum goes away, then it's the amp. If the hum doesn't go away, then it's the headphones.
By the way, did you recoat the diaphragms?
I also have hum problems on my amps. In my bed room, there is no actual ground connection. So, I just live with that little hum. Also, please check to see if the problem is from the volume attenuator. On one of my amps, turning the volume knob back and forth changes the hum. At a certain volume level, the hum would go away completely.
Hi plaurids,
If you touch the the ground pole in the rear of the energizer and the hum disappears, then it's most likely that the hum is from the energizer itself. In my experience, some headphones can be more sensitive to hum than the others. It has something to do with the coating material of the diaphragms. If the coating material on the diaphragm has a low resistance, then it can make the phones hum more easily.
Meeting with Purk and his friend, Wut. Unfortunately, nothing new to show to them. But, as usual, we went out for a lunch together, and I had to make sure that I fed them enough. 😆