Tomic601- that‘s awesome!
I get ARC select tubes from Upscale Audio. They sound good. I have been changing the 6550WE at about 1500 hours and the 6H30pi tubes at 3200 hours. I notice a nice uptick in the sound at that point. Using a Ref 5SE and Ref 2SE Phono. I stocked up on tubes in 2020. I noticed today tube prices are double what I paid 4 years ago- and I need to restock again soon.
Got my first ARC preamp in 1988, a used SP-6b that I then had modified with upgraded components. Used it for 14 years. Got an SP-15 that I used for 18 years. I sent it in for refurbishment by ARC in 2004. And now the Ref 5SE/Ref 2 SE phono. Good stuff. Love having a remote control now that I am old and decrepit.