Well you could say it is a preamp and amp in one. Actually becoming very popular.
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As stated previously by Brutusab, it is in fact an amp and per-amp in a single box. Also, there are integrated that are tube and SS. These are usually referred to as "hybrids". These usually have a MOSFET output and tube input stage. Sonic Frontiers Anthem, Copland CSA28, and Unison are some that come to mind.