HardVacuumDemo is a vacuum tube AU universal binary plugin. It features very smooth overdrive, warmth for asymmetrical clipping, and an Aura control unavailable anywhere else.
The Drive control gives you the basic tube saturation. Warmth doctors how that saturation is applied—and Aura is something a little special. It takes the angle of the waveform and alters it, to produce tubelike characteristics beyond what just working on individual samples will do. Aura was the best way I could describe the result.
Hard Vacuum is $50.