Some advice for new buyers - Give it time.
The first 50-80 hours left me somewhat underwhelmed, I'll admit, but everything is opening up. Seemingly all at once, but that is usually how these things go.
I was on the couch with my eyes closed listening to a vinyl copy of Sufjan Stevens' Illinois, and all at once, I was just 'there', all of the flaws that had troubled me were just gone, leaving spatial, detailed, but 'sweet' music.
I have some tube replacements on the way - Amperex Bugle Boys 6dj8, and Tung Sol 5998. I'll post reviews when they arrive. I also needed to purchase double the quantity I need (for both tubes), so my others may be for sale, if anyone is interested