Absolutely, CURRENT DELIVERY. To quote from Mark Levinson's 2001 Playlist, "A common misconception is that amplifiers actually make a small signal larger. In reality, they convert the power from an AC outlet into several successively larger, but painstakingly accurate, copies of the input signal." So, it is impossible to get accurate sound using dirty power. Almost all my recent upgrades have been concerned with current delivery. Dedicated circuit, power conditioner and power cords - all make a significant difference.
What is your best kept secret in mid-fi?
We all come across some enlightening revelations as we strive for what this sonic nirvanah promises, and think to us, I wish I had known this t h e n (especially before we spent umpteen thousands on ?). If you have keys to good sounds for all to enjoy (affordable), it's satisfying to share them, and is educational to the readers.