Arg dont tempt me although it might be the EL84 on the 20W but I wouldn't describe the sound as muddy. I will roll with it a few weeks and may put my hands in it once I am done with my currents build projects.On my JCA100HDM, the SLO mod basically cleared up the gain. It is less mushy and muddy, and it has more clarity and pick attack. It is like the cross of a JCM800 and a Recto.