Help needed with 50hz hum/buzz in Tube system


My high power tube VTL system is not quite there. I ran seperate outlets on different ciruits for both Mono block amps and the Digital front end which runs through a panamax 5500. The problem is that there is a 50hz buzz/hum comming through both speakers the woofer and tweeter. I connected an ipod to the amps directly and they have a silent background, But when the preamp in connected to the amps the hum returns. The turntable / phono section is even worse. Someone told me that there is a possibilty that the isolated outlets are wired on "opposing legs" of the incomming 220 line.

This afternoon this afternoon I removed the ground pin of the PS audio power cables and problem solved. It seems that Every component in this system must have the ground pin removed, because one I connect another component that is grounded the problem returns.

Any suggestions on what the proper fix to eleviate this issue should be? Thanks again to all for their time

PS if you are a professional electrician working in the rockaways/LI area and would like to take a shot at fixing this let me know
128x128Ag insider logo xs@2xweiserb
Weiserb, you have to take the coax cable out of the box. Disconnecting the receiver to preamp connection will not do. It is not on the connection level.
Please take out the coax cable from the cable box and re-check.
Update. I spoke to Ryan at PS Audio and he said that there is a different grounding potential on the circuits powering the front end and the power amplifiers , and an electrician should correct the above and add an isolated grounding rod for all circuits for the stereo. In addition as mentioned above connecting the cable line may reintroduce the problem and require an Isolation Transformer from the Jensen company.
In your previous post you said you will disconnect the cable from the cable box. Has this been tried already?
With cable disconnected the problem is solved. I need to get one of these Jenson Isolation transformers Thanks !

http://www.jensen-transformers.com/