Start at step one: lift the ground of the amp by using a two prong cheater plug. If the hum goes away then it’s a ground loop.
Detecting “Dirty” Power
I bought a used BHK 250 still under warranty. It is plugged into a Denali S power conditioner. I heard a hum coming from the area around the tubes. I cannot hear it from my sitting position and it doesn’t effect SQ, but I want it gone.
I sent it to PS Audio; they tell me there is no hum and sent it back. They implied I mostly likely have a power problem and recommended some troubleshooting steps. I unplugged everything from the 250 and plugged it straight into the PS Audio receptacle. The hum is still there, but it is not as pronounced. A P15 power regenerator might fix the problem, but I want to know if I have a power problem before I do anything.
How can I determine the quality of the power coming into my house and out of the receptacle? FYI, the Denali is plugged into a PS Audio receptacle/dedicated 20 amp line. I have a whole house generator w/ transfer switch and whole house surge protector.
I sent it to PS Audio; they tell me there is no hum and sent it back. They implied I mostly likely have a power problem and recommended some troubleshooting steps. I unplugged everything from the 250 and plugged it straight into the PS Audio receptacle. The hum is still there, but it is not as pronounced. A P15 power regenerator might fix the problem, but I want to know if I have a power problem before I do anything.
How can I determine the quality of the power coming into my house and out of the receptacle? FYI, the Denali is plugged into a PS Audio receptacle/dedicated 20 amp line. I have a whole house generator w/ transfer switch and whole house surge protector.