chartz
If it’s broke fix it!
Things should be brought down to black or white when it's THAT clear cut, as is the case with mains. And no there's nothing you could say that would make me believe it made a difference in your system. If you produced 100 "witnesses" I would put it down to mass hysteria and nothing more!
True and entirely agreed on.
But the buzzing noise of big toroidals just annoys me. That said, properly made - or not dropped! - transformers don't buzz at all.
So I opted for a DC blocker to reduce that noise for ONE amp. Cheaper than replacing the toroidal, isn't it?
As far as leads and power blocks are concerned, Lidl and € 2 kettle leads it is. Let's be rational about this.