Hi Tom----I just passed the 400 hour make on my 3205. Love it! switched from the stock EH EL34 to Sovtek 6550 for a little more puch and dynamics, but the most musical combo seems to be with Cryo'd JJ Tesla (blue glass) EL34's, they have a very "present in the room" sound. Tried some KT88's (Shuguang) but they make better room heaters than music presenters----sorta dull. Maybe not broken in enuf????