The anodes were slightly pitted and covered with a thick layer of rust; about 3/16ths of an inch.
I wish I had weighed the tubes before I started, it would be nice to know how much weight they have lost.
Inside the tubes were piles of loose rust, at least a quarter inch, which I washed out with a pressure washer.
With everything cleaned up, I wired it all up again and and commenced cooking them. They're far cleaner than when I started but from my experience, the electrolysis process really requires multiple soakings to get to the bottom of the really deep pits.