For anyone considering it:
The EL34 conversion was most likely done at the behest of a guitar player. Depending on how well it was done, it could either make the amp a neat play on the Sunn 200S sound, but more likely, it now sounds like ass, and not in a good way. The other "mods" do not speak well for it either. Figure another $2-300 to get it healthy if you buy it.