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Hum with Humbuster III
Topic Rating: +2 Topic Rating: +2 (2 votes) 
February 11, 2018
11:03 am
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Newbie
Forum Posts: 3
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February 11, 2018
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Hi.

My stereo consists of Atoll preamp and amplifier.

When amplifier working without any inputs – there is no hum. When preamp is connected – there is mechanical hum in amp and preamp+some low noise only in the right speaker. Both of them connected with Humbuster III and Powergrip.

Can anyone tell me – what is wrong and what I can do ?

Thank you for help :)

February 12, 2018
12:18 pm
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PS Expert
Forum Posts: 118
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March 25, 2016
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+2

Hi Igor,

 

Thanks for reaching out to us and sorry to hear that you are having this issue.

Our best recommendation would be for you to follow this tutorial to see if you can source the hum:

 

http://www.psaudio.com/ps_how/…..d-fix-hum/

 

If you cannot solve the issue then please reach out to us at service@psaudio.com and we’ll be happy to assist.

Thanks,

 

– Jeremy

February 12, 2018
1:35 pm
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Forum Posts: 3
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February 11, 2018
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Thank you, Jeremy.

Followed the tutorial of three steps and there were answers NO to step 1 and 2. and YES to step 3.
I have no TV connected, so need to use some ground isolator, but it is not suitable for using with power cables in my country. And the price is very high – about 100 euros with delivery…when I already spend much money for Humbuster and Powergrip to avoid the hum. Well…think I must simple accept that noise.

Anyway – Humbuster is a good at least for making sound definitely better :)

February 12, 2018
1:50 pm
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New York City

Community Leader
Forum Posts: 2603
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April 30, 2012
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Sorry to hear you can’t get rid of the hum Igor.  I know how annoying they can be.

Anyway, a belated welcome to the forum!

Direct Stream DAC, BHK Preamp, BHK 250 amp, P10, NPC, Linn LP12, Wilson Audio Sophia 3 speakers, PSA AC-12 power cables, Belden ICONOCLAST TPC speaker cables and balanced interconnects

February 12, 2018
1:57 pm
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PS Expert
Forum Posts: 118
Member Since:
March 25, 2016
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Hi Igor,

 

A yes to Step 3 means that you very likely have a ground hum.

“If steps 1 and 2 were “no”, but removing all inputs eliminates the hum, it is likely you have what is called a ground loop.”

 

Although it is not recommended you can try lifting the ground pin to one of your items like the Preamplifier as a test.

If the hum completely stops then clearly there is a difference in ground potential between your two items.

The tutorial recommends trying the Humex ground line filter:

 

https://www.amazon.com/Ebtech-Hum-Voltage-Filter/dp/B0002E4YI8/ref=sr_1_1?ie=UTF8&qid=1473031920&sr=8-1&keywords=AC+ground+lift

 

If you continue to have this issue then please reach out to us directly at service@psaudio.com and we’ll be happy to assist directly.

Thanks in advance,

 

– Jeremy

February 12, 2018
2:19 pm
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Forum Posts: 3
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February 11, 2018
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Thank you stevem2 and Jeremy :)