A couple or so weeks ago I bought a 3kVA balanced mains transformer to power all my Hi Fi.
It has significantly improved the sound, but this is the technical forum, so let's press on !!
Two queries, please.
Firstly. The transformer has a slight hum. I'm assuming it's the primary, as it hums even when there is nothing on the secondary. The transformer is a (huge !) toroidal. The hum goes up and down in volume at different times of the day, although there is no pattern.
What causes the hum, and why does it vary?
Secondly. The transformer puts out a balanced supply. 120 volts on both the live and the neutral. Do the transformers in the various bits of the Hi Fi then also put out a balanced supply? Or do they unbalance it?