No issue so far. I ordered mine without tubes and put my own selection of tubes on it, including the robust Russian version of el84This was too tempting, so I ordered one. Should be here any day. Have you had any reliability issues? I got the schematic from the vendor, and it shows that the screen grid is at 270v while the plate is at 260v. I don't know too much about this, but I thought that would lead to premature tube death.