gunners01
I have the Line Magnetic 518IA integrated , the power tubes in mine are 845s versus your amp's KT120s. I left in the stock 845 but changed the 6L6s to NOS GE, the tube rectifier to NOS RCA and the 12ax7s to NOS Tung Sol 5751s. The NOS tubes took the sound of the amp to a more satisfying level. For me, I found the lower gain of the 5751s more pleasing in the 518IA. Others have noted some NOS recommendations for 6sn7s, if you want to try new production I'd suggest either Sophia Electric 6sn7s or Black Treasure CV181s; I have used both in my Modwright LS100 preamp and found them quite good sounding. Per jetter's post it would be worthwhile to you click the link and read Brent Jessee's assessment of the different individual tube types and their respective variants. So while I disagree with millercarbon's assessment of tube impact, I will agree with him that a quality power condition and cord, and isolation feet and so also benefit my equipment. I haven't gone the fuse route so I can't comment on that one way or the other.
I have the Line Magnetic 518IA integrated , the power tubes in mine are 845s versus your amp's KT120s. I left in the stock 845 but changed the 6L6s to NOS GE, the tube rectifier to NOS RCA and the 12ax7s to NOS Tung Sol 5751s. The NOS tubes took the sound of the amp to a more satisfying level. For me, I found the lower gain of the 5751s more pleasing in the 518IA. Others have noted some NOS recommendations for 6sn7s, if you want to try new production I'd suggest either Sophia Electric 6sn7s or Black Treasure CV181s; I have used both in my Modwright LS100 preamp and found them quite good sounding. Per jetter's post it would be worthwhile to you click the link and read Brent Jessee's assessment of the different individual tube types and their respective variants. So while I disagree with millercarbon's assessment of tube impact, I will agree with him that a quality power condition and cord, and isolation feet and so also benefit my equipment. I haven't gone the fuse route so I can't comment on that one way or the other.