@willmacc, I don't have this amp. I have a Primaluna Dialogue HP integrated and have tried the Tung Sol 7581A reissue. I highly recommend them. I've rolled KT150s, KT88s, EL34s and the 7581as. The Tung Sol 7581a is my favorite. I like the 150s, 88s, and 34s too--each for their own qualities. But my all around choice is the 7581a.
Tube Rolling with the Line Magnetic 518 IA
I recently took delivery of the fine Line Magnetic 518 IA. This is an excellent integrated except it comes with basic inexpensive tubes. I'm lloking to hear from those who have done any tube rolling with this amp and what combination turned out to be the most musical sounding. Also interested in how many hours it took to break in this amplifier.