I have the R version running a pair of merlin TSM-M's at 86db and they are right at the minimum of where I'd like to be in triode. I'm not a volume freak so it works perfect for me. The non R version has 30% less power and it would not work as well for my set-up. I switched to UL for the extra power but find the Triode too sweet a sound to pass up. I second Dhaymond, this is a great amp.
