Transformer hum caused by Devialets?

[Greg]

I use Plixir balanced isolation transformers for the power conditioning of my Devialet 1000 Pro. The isolation transformers don't hum. I've not tried the isolation transformers with a 220 or 440 Pro.

However, I have an LG OLED TV, which *will* cause the isolation transfomer to hum if I connect the TV to the output of the isolation transformer. So my TV is connected via a regular power conditioner.

Transformer humming is usually caused by a DC offset it the AC supply.

You might want to try the ifi DC Blocker to see if it helps your case - although it doesn't fit directly into the IEC power port of my Devialet 1000 units.

https://ifi-audio.com/products/dc-blocker/

Good reply. I’ve had exactly the same in the past. A DC Blocker sorted it. A transformer will not pass on DC but it will hum. DC offset can be readily measured on the mains with a basic multimeter.