I just recently purchased the Rogue Cronus with magnum upgrade (total cost $2200)- it is a very well built and wonderfully musical sounding amp - hadn't heard it before ordering, and for me glad that I got it. The upgraded amp comes with NOS 12au7 & 12ax7s and EH KT90s , though you can still use EL34s. Upgrade pushes max wpc from 55 to 90. I am using it with Tyler Acoustic Linbrook System 2s
