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In Reply to: RE: Now this is obsession. LOL posted by Michael Samra on August 22, 2016 at 17:52:39
Using an isolation transformer is a proven way to reduce line noise. Before large UPS systems were economical, many broadcast and technical centers had a separate isolation transformer for the technical power distribution to keep it somewhat isolated from other building loads.But these guys still have all their audio gear in parallel with their refrigerator and the plethora of switch mode power supplies in today's households. Putting in a dedicated pole transformer does nothing to isolate other loads within the house. And we know that it's those EMI sources that do the most damage. The inductance of the line wires does help filter out distant noise sources.
Classic case of the audiophile having no knowledge of electrical engineering.
They would be far better served in buying a simple 2kva isolation transformer.
Edits: 08/24/16Follow Ups:
preamp. I sold it to a guy in town. As it was not as good as my other preamps but otherwise working perfectly. Anyway about a week later he calls me complaining about a weird noise that was coming and going. So, i take it back and try to track down the source of the noise. So while it was on and hooked up i get no noise so i started to prod the caps and resistors and one of the caps started like an oscillation noise. So i replace it and retest, no noise, good to go back to the guy. Return it and few days later he calls back, he wants his money back because the noise is still there. so, i go back to his house and check out his place. And in one corner of the living room he has a massive rack of what i believe was computer routers or internet servers, i mean from floor to ceiling and 3 across. I explained to him that it is all the computers that he has in the room that is causing the noise. And he needed to get an isolation transformer or one of those audio power banks to clean up the AC noise. He did that and it helped but the preamp was especially susceptible. dak
"He did that and it helped but the preamp was especially susceptible."
An isolation transformer won't stop the air borne stuff.
An am radio, tuned off channel, will show how much RF noise comes out of some of this stuff with switch mode power supplies.
Tre'
Have Fun and Enjoy the Music
"Still Working the Problem"
:-)!
Warmest
Tim Bailey
Skeptical Measurer & Audio Scrounger
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