I own m-120s and added a used 99 about 9 months ago. I wasn't particularly fond of the 99 at first. Mark at Rogue recommended changing the Penta Labs 6sn7s for the NOS Russians. That did it. Much better, I then moved to the 120's, I added Electro Harmonix 6550's and my next addition is a set of Mullard cv4004 (12ax7)'s . It go a bit better. The best tweak so far has been the replacement of the stock power cords to Virtual Dynamics power3's. Whoa !
