Hi
i have a 596 going into 551 and 555. Recently bought some powercords from Russ Andrews expecting to send them back under his 30 day home trial.
I don't understand how or why they work but bass goes a lot deeper with more attack and the sound generally sounds less smeary. so for my system changing the mains cable worked and i am now thinking aout his mains silencer or purifier.

sun sand and suffering