This is the THD+N vs power for a Quicksilver 60W amp, 12AX7 -> 12bh7 -> KT88's. I'm always happy to see something that is better than advertised. It makes right at 70W at 1% THD. The other amp was the same. These are fairly new amps, I put new coupling caps in today for the owner.
I can only hope the KT88 monoblocks I build look anything like this!