2. amps-preamps
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Transformers humimg........again

Yes I'm starting a new transformer hum thread. I read through most of the others, but did not find the info I was after, sorry.
Let's start. I have a dedicated 20A line for my audio gear. Gear consists of a BPT 3.5 Signature ac isolator, Jolida JD9 II phono pre, Naim 5i-2 int. amp., two REL T-5 subs, and a Clearaudio Concept TT. Now the important part, ALL components that utilize a transformer (BPT, Naim, REL's) all have transformer hum. And yes, it is transformer hum, NOT sound from the speakers. I had a buddy, who's an electrician, over last night, and we tore everything apart from the main box to the outlet, no results. Tried many other outlets in the house, with and without the BPT unit. No difference, all transformers still humming, whether alone or not. Unfortunately, my power is fed to my house from overhead lines, but so be it. I can't change that unless I move.
Question to answer, "what can I do to stop the transformers from humming?" The hum is not overwhelming, fairly subtle actually, but nonetheless, it is something I would like to eliminate.
Can anyone offer experienced or educated replies?

Thanks :)
128x128shawnlh
pbnaudio's avatar
pbnaudio
1,613 posts
 
You can install a balanced power transformer outside by your electrical panel to feed the 20A dedicated line. Although not to code (JEA48 can fill you in on the details ) it will cure the problem.

For more details on balanced power look up Bryson's Tourous products and Equitech they offer sub panels with balanced power transformers.

Good listening

Peter
geoffkait's avatar
geoffkait
23,365 posts
 
You can minimize the effects of transformer hum by isolating the transformer from the chassis and from the circuit boards. Remove or loosen the bolt(s) holding the transformer to the chassis and place 1/8" cork under the transformers. That should help.
jwlaff
39 posts
 
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