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In the Forum: Audio Discussions
In the Thread: It’s mad, mad, mad... electricity.
Post Subject: Keep working on it, it is not PP problem.Posted by Romy the Cat on: 1/13/2013
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 SOS wrote:
I've tried even placing a cheater plug on the PP+ unit and still get the hum. Why can everything be plugged into another conditioner or everything into the wall and all is dead quite BUT plug either the phono stage and or the TT motor into the PP+ unit and a hum begins. Grounding the TT and or motor back to a common ground does not help. Only thing that stops hum is not having either of these devices plugged into the PP+.

SOS, this is emblematic ground loop scenario. I am surprised that ask why it does not take place with another devise. This is how the thing usually works. If you have 5 different step up transformer, or 5 deferent phono cables then it will be very probably that each of them or some of them would require different grounding schema, despite the all are made in the same ways. I am a bit surprised also that if you were placing a cheater plug on the PP then you have the hum. The presents of hum with lifted PP output is unambiguous indication that something in your installation is not kosher. I presume that it is on digital domain and people frequently forget that digital and analog have different loops to ground. Do not forget your computer, monitor and network switches.  It is very easy to connect just analog and to see if you have the noise.  Then add one element a time with lifted ground. It is not really hard to find the problem.

You need to understand that your claim to PP company will not be warranted, all that they can do it confirm that they did not lift ground from input and output. There is absolutely nothing in such unit as PP is that might be responsible for hum in your system. If I was PP owner I would discard your complain it might not be expected for my company to debug the ground loop on the fields. I am not in the business to advocate PP but in this specific case I think you ask them to much. If you completely at lost with this then I do not mind to help you with it. I am assuring with 99.999% certainty that there is a solution and the solution is outside the PP.

Rgs,
Romy The Cat

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