Funny, I took my new PRRI in to get new tubes and biased by a local tech who is also a very opinionated amp builder. HE does amazing work and he's worked on another PCB amp of mine, and have no complaints. When I went to pick it up he looked at me, shook his head and said something along the lines of, "You now, I checked out the circuit in your Princeton Reverb Reissue, and it a real Princeton. It's full of cheap, junk Chinese parts and assembled in Mexico. But with decent tubes and a better speaker you can get to around 70% of what an original sounds like...maybe!" I told him I get it, and would like an original, or one of his custom builds, but just don't have the coin to spend on one. I didn't push it any further because he can get pretty hot under the collar pretty easily and I just wanted to get my amp and go home and play!