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The hum is clearly coming from the speakers when I turn on the tuentable without any record playing. I plugged out the RCA interconnect from the turntable and turn on the turntable again and the hum is still coming from the speakers. I even move the Phoenix Engineering speed controller around under the VPI Classic 3 turntable, but I could still hear the hum. It is not coming from the turntable because I removed the RCA interconnect.
I will call them tomorrow.
I am listening to some records now and I can still hear the hum before I start the record. I disconnected the Turntable from the Phoenix Engineering power supply and the hum disappear. So the Phoenix is definitely is causing the hum. I even put the Phoenix power supply on the floor away from other power cords, but it made no difference. The display on the Phoenix is working fine: 33.3 RPM on the main display and 33.334 on the racometer. So it's seems to be doing the job. But the hum from the speakers is a mystery.
I agree with sbank....its a ground problem. If you use a cheater, only use it to confirm a ground issue...don’t keep it in the system....they ruin the sound. Use a voltmeter to see that all wall plugs are wired correctly. This can be very tricky to find. I would get in touch with both Phoenix, and VPI and see if they have suggestions. If I were in a betting mood, I would say that Harry has the answer.
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.
Thanks for the tip.
I tried your first option and it worked. The second option still cause the hum in the system. I left the unit connected with your first option. I also notice that the Roadrunner display continue to flash when I turn my system off. The Eagle display goes off fine, no issue. I have to unplug the roadrunner each time after use. Any idea what is going on?
Can you clarify: display flashes? Does it display 5 dashes or an RPM reading? You can put the display to "sleep" with a long press of the on/off button (back panel) or it should blank ~ 5 minutes after the platter stops rotating. Sometimes, surges or static shocks can cause the sensor to trigger which will take it out of sleep mode, but it should blank again in 5 min.
I am please to announce that the issue with the Roadrunner has been resolved.
After talking to Bill at Phoenix Engineering we realized that the Roadrunner was getting power even after the system was turned off.
He recommend that I plug the Roadrunner into the wall socket to see if the LED on the Roadrunner would stop "blinking/flashing", and it did stop. It turned out that my Power Conditioner was at fault; one socket was continuously providing power when it should have been completely turned off. But no worries, I will be getting a MPC 1500.
Another thing I was doing wrong was to turn on/off the TT with the TT switch. Bill said I should use only the Phoenix power switch to turn the TT on/off, even when changing records. The power switch should be pressed until I see dashes (------) on the display, then the platter will stop. Press again and the platter start to turn. Make a lot of sense. I will revisit the manual again and drink it all in this time.
Thanks to Bill at Phoenix Engineering and to everyone for their suggestions.