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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 :)
shawnlh

Showing 1 response by georgehifi

georgehifi's avatar
georgehifi
10,312 posts
 
atmasphere
What is your line voltage? It should not exceed 125V for more than a second. If its high that could explain the problem.
+1 for checking this.

Canada is supposed to be 120v.
In Australia we’re supposed to be 230v mine measured quite constantly around 250v, incandescent light globes would last a couple of months, yes my transformers were a little noisy with a screwdriver to the ear test, but the worst is your paying more for your power, when using unregulated appliances, fridges, aircon, heaters,lighting, poweramps, microwaves ect ect.
I complained very hard, and eventually they put the whole street on a different tap on the pole transformer down the road. Now I have correct 230- 235v no more globes blowing, and my usage is down. And I swear my system sounds better, even after I re-biased my amps, back to what they were with the 250v.

Cheers George
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