Are you serious? They look like $300 amps.
Apparently the simplicity is deliberate
Tsuda-san's design philosophy is closely aligned with Albert Einstein's often quoted dictum to make things as simple as possible, but not simpler. More to the point is Einstein's corollary: "Any fool can make things bigger, more complex, and more violent. It takes a touch of genius - and a lot of courage - to move in the opposite direction." In audio design terms, this means a minimalist approach and perfectionist emphasis on parts quality and circuit layout. A short signal path is an explicit design goal.
http://www.enjoythemusic.com/superioraudio/equipment/1207/silicone_arts_zl_120_cf_080.htm