sbank is correct, the hum is cause by a grounding issue. The Eagle PSU uses a switch-mode power supply so the 3rd wire on the AC output is isolated from the wall socket ground.
If you are using a step up xfmr, ensure that the table's audio ground wire is connected to the phono pre-amp ground. Some SUTs can isolate this ground connection.
Try one (or both) of these:
Ground the case of the Eagle amplifier by attaching a ground wire to one of the rear panel screws; connect the other end to a grounding point on your system. Start at the phono pre-amp, main pre-amp, main amp or wall socket. You may have to experiment to find the best location.
Isolate the 3rd wire ground on the table's power cord by using a 2 prong adapter; connect a ground wire to the adapter ground tab (3rd wire) and connect to your system's ground.
If you are using a step up xfmr, ensure that the table's audio ground wire is connected to the phono pre-amp ground. Some SUTs can isolate this ground connection.
Try one (or both) of these:
Ground the case of the Eagle amplifier by attaching a ground wire to one of the rear panel screws; connect the other end to a grounding point on your system. Start at the phono pre-amp, main pre-amp, main amp or wall socket. You may have to experiment to find the best location.
Isolate the 3rd wire ground on the table's power cord by using a 2 prong adapter; connect a ground wire to the adapter ground tab (3rd wire) and connect to your system's ground.