I owned 2 rogue components, a RP-5 preamp and a Cronus Magnum with KT120 tubes.. I always felt the Cronus Magnum amp with 4 KT120 tubes sounded a little bit grainy. I did a lot of tube rolling and nothing could get rid of that. So I wonder if the Rogue 180 will have the same type of sound. The RP-5 tube preamp was an excellent sounding preamp once I changed out the cheap JJ tubes for a pair of Mullard NOS tubes. I would have kept it but a very expensive McIntosh preamp came into my view and had to have it.
If you are buying new, Uncle Kevvy will charge you only the difference on the KT150 tubes from the stock EL34 tubes which will not give you the bass slam and power of the KT150's, but may sound a bit sweeter in the midrange. There was a pair of those Prima Luna Monoblocks with the 150 tubes for sale here a couple of weeks ago at a good price. Not sure if they sold. The search feature really sucks now.
If you are buying new, Uncle Kevvy will charge you only the difference on the KT150 tubes from the stock EL34 tubes which will not give you the bass slam and power of the KT150's, but may sound a bit sweeter in the midrange. There was a pair of those Prima Luna Monoblocks with the 150 tubes for sale here a couple of weeks ago at a good price. Not sure if they sold. The search feature really sucks now.