Never heard or sold one of his tube amps. Did sell his early PL 400 and PL 700 amps. They were capable of playing very LOUDly, but most of them failed for various reasons. Typically, the owner would crank them up "all of a sudden" and that would cause them to fail. Other times, the source would send a "spike" (not a technical term!) to the amp and whatever protection circuits it had would not function correctly and it would fail. My customers loved them when they worked, but much like Crown amps back in the day (solid state ones), they tended to fail rather regularly.
I heard that some live bands used the PL 700’s on stage, but I don’t personally know of any. I would have cautioned them to have some in reserve...
Cheers!