The Nemesis series amps were different from the World Tour series of amps in that they had an entirely FET solid state pre-amp as well as amplifier and one semi-parametric EQ control along with the standard bass, mid, and treble shelving controls. Most of the Eden WT series used a hybrid pre-amp with both tube and solid-state components and a solid-state amplifier. There were three completely solid-state WT amps (WT330, WT390, and WT405) that used a "Golden Ear" chip to get the warmth found in the hybrid World Tours. The Nemesis did not have that chip.