Try disconnecting ALL of your sources from your preamp. This means power cords and interconnects. See if this gets rid of the problem. If it does, add one source back at a time. First do the power cord into the wall and check that. Then connect the interconnects between the source and the preamp. EACH piece step BY step. This will tell you where the hum is coming in from IF it is source related.
If you disconnect the sources and it is still humming, try disconnecting one amp at a time. In other words, try the preamp and Krell and check results. Then try the preamp and EAD, etc.. If it does it with both amps, then just leave the amps plugged in with NO preamp connected. You've got to narrow it down as to where it is coming into the system and go from there.
I know that this can be VERY frustrating. I am currently in the same boat as you. I recently added a new DAC and i'm getting a VERY noticeable hum. While most of the reaction is between the DAC and preamp, i can plug the DAC directly into my amp and still hear the hum ever so slightly. Evidently, the DAC and that specific preamp just don't jive. Luckily, i have several of the same preamps, so i'm going to try swapping in a few others and see what happens. Who knows, i may have some leaky caps or ???
The weird thing is that changing power cords on the DAC makes a VERY noticeable difference in the pitch of the hum heard through the speakers. Who says that power cords don't make a difference ???? Sean
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If you disconnect the sources and it is still humming, try disconnecting one amp at a time. In other words, try the preamp and Krell and check results. Then try the preamp and EAD, etc.. If it does it with both amps, then just leave the amps plugged in with NO preamp connected. You've got to narrow it down as to where it is coming into the system and go from there.
I know that this can be VERY frustrating. I am currently in the same boat as you. I recently added a new DAC and i'm getting a VERY noticeable hum. While most of the reaction is between the DAC and preamp, i can plug the DAC directly into my amp and still hear the hum ever so slightly. Evidently, the DAC and that specific preamp just don't jive. Luckily, i have several of the same preamps, so i'm going to try swapping in a few others and see what happens. Who knows, i may have some leaky caps or ???
The weird thing is that changing power cords on the DAC makes a VERY noticeable difference in the pitch of the hum heard through the speakers. Who says that power cords don't make a difference ???? Sean
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