The Sunn brand has been known for their stalwart, heavy-duty high wattage amplifiers, and the Solos is no exception. The term "solid state" gets thrown around like a dirty word in this day and age, but vintage SS circuitry can perform remarkably tube-like, and provide a quality that is unique in the realm of amplification.
This example is all original, down to the Sunn-labeled Eminence speakers.