Residual "Buzz" on my P3-24, TT-PSU (???)

Posted by Time_Stands_Still (A) on June 26, 2012 at 13:32:10

Ok, when I hook up my P3-24 and its supplied TT-PSU. I get a bit of residual buzz. I rewired the arm ground and the arm is 100% correct in wire, continuity and such. The P3-24 is connected through my Cambridge Audio 640p phono preamp and it's grounded to the preamp's ground post.

With my stereo switched to the input used to play LP's and volume turned up quite loud I only get a bit of the 640p's phono preamp hiss/noise. As typical as I always have with it and unobtrusive. Ok, now I go and turn on the TT-PSU and I get "buzz". The TT-PSU is properly connected, the wall wart power supply is connected to a good quality power strip, though it makes no difference even if I plug it directly into the wall outlet. The wires on it are clean, and visually undamaged. I decided to cut about 3ft of 18 gauge signal wire and ground it to one of the TT-PSU's back panel screws. I in turn connected it to the 640p ground terminal. The "Buzz" is greatly reduced say oh by 90%. It's hardly noticeable at low volumes but grows a bit more at higher volumes and if one listens for it, IT'S STILL THERE!

So now if I disconnect this ground wire I attached to a back screw of the TT-PSU the "Buzz" grows louder again. If I then physically hold the tip of the stripped ground wire in one hand and the I touch the top of the TT-PSU or even if I just touch one of the back screws the "Buzz" is oh 99.9% gone. But if I reconnect the ground wire and as such no longer touch the wire and TT-PSU cover the "Buzz" is louder again back to the say oh maybe 90% level not the 99.9% gone level. WHAT GIVES!?!

Why does the "Buzz" virtually goes completely away if I am a conduit between the tip of the ground wire and the top panel or even touching the screw in back of the TT-PSU?

It also make no difference if I choose other grounds, ie: my Onkyo receiver's ground post or even the screw on the wall outlet's decorator plate.

Any thoughts or advice?

Thanks in advance.

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Topic - Residual "Buzz" on my P3-24, TT-PSU (???) - Time_Stands_Still 13:32:10 06/26/12 (6)

RE: Residual "Buzz" on my P3-24, TT-PSU (???) - markinuk 14:37:55 06/26/12 (2)

RE: Residual "Buzz" on my P3-24, TT-PSU (???) - Time_Stands_Still 15:48:08 06/26/12 (1)

RE: Residual "Buzz" on my P3-24, TT-PSU (???) - markinuk 02:46:58 06/27/12 (0)

RE: Residual "Buzz" on my P3-24, TT-PSU (???) - fullheadofnothing 14:00:04 06/26/12 (2)

RE: Residual "Buzz" on my P3-24, TT-PSU (???) - Time_Stands_Still 14:14:48 06/26/12 (1)

RE: Residual "Buzz" on my P3-24, TT-PSU (???) - fullheadofnothing 14:28:33 06/26/12 (0)

Residual "Buzz" on my P3-24, TT-PSU (???)

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