The Rogue Hydra is a 100Wpc amplifier that combines a tube input with a class-D output section (using only the module's MOSFET output, bypassing the rest), with about 2dB of negative feedback. If Rogue is lucky, then this will appeal to both audiophiles that are tube fans and those that are fans of modern digital technology. If they're not lucky, then tube fans will reject it because it includes the evil of digital, and digital fans will reject it because it includes technology that they regard as obsolete. Ultimately, it's the sound that mattersand, according to Rogue's Mark O'Brien, it's an effective combination of the tube sound with the power of solid-state.