Hey Facten,
Sorry for the delay. If the capacitors discharge then he the op will need enough time for everything to charge up and level off. This may not be for 100% tube amp. That might only need a day. I have tested a lot of power cords and components. I mean a lot. I do not want to get into an audio war. I just wanted the op to have a totally fair a/b test. You can usually tell right away if you test with the right tracks that you know well and have a good ear. I doubled my outlets from two receptacles to four receptacles and plugged everything but my sources into them. All sources went into the “conditioner” I use Puritan 156 with the Puritan Ultra XX power cord. Nordost is killer stuff but I would spend a lot more than I wanted to. I also have the Puritan GroundMaster system with two 8’ copper coated rods outside my listening room.