New Transformer on the Pole

So, I got home yesterday and my wife told me that the power was out for a few hours while the town electrical department replaced the transformer on the pole across the street. I looked outside the window and saw the new transformer--much different (nicer, more modern) looking that the old one that I've been looking at for years. You know what I'm wondering......

So, last night I got a chance to fire up the rig and do some listening and I have to tell you that I heard some noticeable improvement in the sound. The background was "blacker" and there was a bit more purity and dimensionality. Am I just imagining this or could a "transformer upgrade" really deliver sonic gains?