Leave the player turned on 24/7. When the day comes you realize it sounds just the same now every day, its burned in. "Manufacturer says" can mean anything. Especially since it wasn’t even the manufacturer who said this. No one who manufactures tubes ever talks to anyone. Its the people who sell them talk to people. Key distinction.
Also you probably know this but the reason you are so happy with your system is its so well tweaked out with SR and PPT. If you still have some TC a thin coat on the tube pins and around the base of the tube will do wonders. Just be sure as always to keep the thin coat around the base from running all the way to the pins and creating a short. I’m assuming you pretty much used up all your TC coating caps and transformers and outlets? How much if any do you have left?
Also you probably know this but the reason you are so happy with your system is its so well tweaked out with SR and PPT. If you still have some TC a thin coat on the tube pins and around the base of the tube will do wonders. Just be sure as always to keep the thin coat around the base from running all the way to the pins and creating a short. I’m assuming you pretty much used up all your TC coating caps and transformers and outlets? How much if any do you have left?