I got this head YEARS ago with hopes of learning more about tube amps from my old shop partner, the lovely and talented Adam White at Chrome Dome Audio here in Cincinnati. We opened it up once to clean all the crap out of it (it had all the trapping of a mouse taking up residence inside of it for a winter). Other than that we never got any further with the diagnosis. As I'm up to my @$$ in guitars I have no time, energy, or patience to work on a tube amp. I'm parting ways with it as is. My loss is your gain! I don't know what's wrong with this thing. It may be easy, it may be hard, but I still don't care. It currently has no tubes, but I have a few old tubes that may or may not work, but I'll toss them in anyway. *I in no way assume any responsibility for what you decided to do with this amp* All that being said $175 + actual shipping from 45014 will get this monster to you.