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#1
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Electrical Noise, Thoughts?
I recently started hearing the hum coming from my preamp, DAC and streamer/server.
My system sits on a dedicated 20 amp circuit installed on a low use panel. I tore down the system with power and interconnect to see if it’s related to a ground loop, no such luck. Also, pulled the Furutech outlet being paranoid, no issue properly hooked up and tight. I came from a PS Audio P10, and changed to the Nordost QRT distribution system, as it did not limit my system. There is no cable TV, and the dimmers are on a separate circuit and tested by power off, no issue. Recently the electric company upgraded the meter and I just got off the phone with them, they indicated there has been a small amount of customers reporting issues of all sorts but in small numbers. The upgrade took less than 10 minutes to change the meter from analog to digital. Across the street is a full remodel and the transformer is on the same pole were power goes into their home, not sure if something happened there. Of course this is driving me crazy! Any thoughts on the meter or the home across the street? |
#2
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Are you sure that the hum is plaguing all sources? Have you checked to see if perhaps it is only the preamp, or only the DAC, that is the source of the hum?
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Primary sources: VPI TNT III/SDS turntable, SME-V arm; Bryston BDP-3 digital player; Bryston BDA-3 DAC; McIntosh MVP-881 disc player; McIntosh MR-80 tuner. Preamplifier Audio Research Ref 5SE; Audio Research Ref Phono 2SE; Moon 430 HA. Amplifiers Conrad Johnson Premier 1B; Audio Research D-300; Bryston 4B. Speakers Infinity IRS Beta. Recorders Tandberg TD20A; Crown SX-822; Nakamichi 670ZX; Alesis Masterlink ML-9600. Power Tice Power Block/Titan (x2); McIntosh MPC1500; API Ultra II-20; multiple 20A derated dedicated lines. |
#3
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Try putting the P10 back in your system to see if the hum goes away.
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#4
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When I installed the PS Audio Noise harvesters.. It was clear the dimmer in the bedroom, on a separate circuit and all that, still was causing the Noise Harvesters to blink a lot.
Now if the dimmer is off, and the hum is the same.. it will not be the dimmer. Often hum is a DC offset problem. And since you got a new meter.. it may be the problem. I do not know of there is a way to remove DC? I am pretty sure DC cannot get through the PS Audio regenerator |
#5
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Thanks for the response, and here are comments to your input:
Cleeds - hum is across the board, broke it all down, power cable and interconnect. Higgens - P10 has long been sold. Beet Farmer - Agree on comments about dimmers, and DC offset, P10 has long been sold |
#6
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If it’s DC on the line, you might consider a PS Audio Humpbuster III.
https://www.psaudio.com/wp-content/u...II_-Manual.pdf I’m sure Ivan can hook you up. |
#7
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__________________
Dan STUDIO - McIntosh C1000C/P, MC2301 (2), MR88, Aurender N10, Esoteric K-01X, Shunyata Sigma spdif digital cable, Sonos Connect, PurePower 2000, Stillpoints, Furutech Flux 50, Michell Gyro SE, Michell HR Power Supply, SME 309, Ortofon Cadenza Black, Wireworld, Sonus faber Amati Anniversario LIVING ROOM - McIntosh C2300, MC75 (2), MR85, Magnum Dynalab 205, Simaudio MOON Neo 260D-T, Schiit Audio Yggdrasil, Aurender N100H, Shunyata Sigma USB cable, Micro Seiki DD40, Ortofon Cadenza Blue, Nakamichi BX-300, Sony 60ES DAT, PS Audio P10, Furutech Flux 50, Sonos Connect, Stillpoints, Wireworld, Kimber, PMC EB1i, JL Audio f113 VINTAGE - McIntosh MA230, Tandberg 3011A tuner, Olive 04HD, Sony DTC-59ES DAT, McIntosh 4300V, JBL 4312A Last edited by jdandy; 12-18-2018 at 05:16 PM. |
#8
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Thank you for the recommendation, and yes Ivan is a go to source. |
#9
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Dan, thanks for spelling this out, I talked to an electrician friend today and he recommended much of what you indicated plus wants to put a second grounding rod to the sub panel. Puget Power is coming by tomorrow at 0800 to look at their new digital meter recently installed which I’m hoping is the problem, one way or another this problem has to go bye-bye. |
#10
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Good luck to you and please report back to us on the outcome. Last edited by cleeds; 12-19-2018 at 10:33 AM. |
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