The Technics SU-C04, as its written right on the front panel, was part of Technics Micro Series which were available from 1979 to 1982 (I think). There was a matching tuner, the ST-C04, and mine also has the RS-MO4A cassette deck. I have the trio stacked ontop of my computer hutch with a pair of mini polk speakers. I\'ll get the manual when I can figure out how to.
I have this same 2 Items ST-Co4 & SU-C04 there going up for sale i have not yet decided where to place the ad but there great working order.