Oliver Powerflex P500

Hello, anyone know of a good resource for this amp? I have all the wiring diagrams. It wasnt in working order when I found it. I've been rocking it for about three months now and I love it. But looking for info and what its worth leave me guessing. Thanks!

 

Seriously... No one owns or has one of these that can help me out. Or maybe I should ask a more detailed question. My speaker and or tubes overdrive/clip really easily I'm debating on adding a 210 and replacing the vintage speaker with something new. I'm not sure if that will fix my problem. Also, the tubes the head uses are hard and almost impossible to find. If I retube it I'm not sure if I'll have the same problem. Or if adding an ext cab and new will just be a waste of my time.