Popular Post blue2 Posted December 30, 2020 Popular Post Share Posted December 30, 2020 3 hours ago, Gavin1977 said: Just to be clear there is no hum through my speakers. This is a quiet DAC, just that the noise floor isn’t as low as my T+A. All of my equipment is attached through a filtered mains block. I’m not sure an isolation transformer would resolve the issue, main reason that the hum from the physical unit itself isn’t present when first powered. A bit of Googling may help: 1 A cheaply designed transformer with unduly high magnetic field levels 2 DC on the mains, which has a vastly disproportionate effect in moving the magnetic circuit asymmetrically towards saturation 3 Unduly high mains voltage 4 Transformer designed for 60Hz being used on 50Hz 5 Transformer inadequately (or barely adequately) rated for the load 6 Transformer badly assembled with insufficient glue https://forums.audioholics.com/forums/threads/getting-rid-of-transformer-hum.3879/ Currawong and Gavin1977 1 1 🎸🎶🏔️🐺 Link to comment
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