Jump to content

50-60Hz hum in my system

jason str

Recommended Posts

  • 2 months later...
On 11/7/2016 at 11:31 AM, babadono said:

Jensen Transformer website: http://www.jensen-transformers.com/ is an invaluable resource for understanding, troubleshooting and eliminating ground loops in audio and video systems. To look at their App. notes you have to create an account (big deal). Most of their app. notes are too big file size to cut and paste here.

I have spoken with the President of the company several times and the cool thing is he only wants to sell you a transformer if you absolutely cannot fix your problem any other way.

 Also their app notes explain balanced and unbalanced interfaces and how to interconnect them properly.


On 11/18/2016 at 10:43 AM, babadono said:

Dummy plugs!  Dummy plugs! See Jensen Transformer website mentioned above. There IS a scientific way to figure this out. If you disconnect your TV cable feed does the hum go away completely? If so you may need video isolator as opposed to anything in the audio path.



Listen to this man.  It seems that everyone is glossing over these posts.  If you want a simple, accurate, science based method for eliminating hum get the dummy plugs and diagnostic chart.  IT WORKS!  Anything else is guesswork.

Link to comment
Share on other sites

Yes if you have a hum in your system and it is unbalanced equipment you may not have a ground loop at all. You may be experiencing another type of problem called "common impedance coupling" or CIC as cecaa850 was with his tube preamp to tube power amp connection. CIC occurs when the power ground and signal ground currents travel through the same conductor as they do in unbalanced equipment. Most of the time the pieces of gear play nicely with each other and there is no hum or a barely perceivable (acceptable) level of hum. But occasionally CIC causes the 60Hz power ground current to get added to the desired signal and the amplifier amplifies it. And there it is HUM.

  • Thanks 1
Link to comment
Share on other sites

  • 2 weeks later...
  • 1 month later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...