Teac AE-200

Part of Teac's first forays into non-tape products - none too successful, like the few which followed throughout the 1970s.

Center of this small woody box is a differential circuit powered by a ±40V dual power supply - powerful and modern, almost avant-garde.
Another avant-garde-ish feature was to be awaited a couple of decades to reappear on many late 1980 "ultra" components and d/a converters : phase reversal ! Here done independently for the left and right with two rockers, too.

Also in was a balance check. Apply a parallel signal to both L and R inputs : if no sound comes out of the speakers, it means there is no circuit imbalance between the two sides of the differential circuit.

Small-size notwithstanding, the AE-200 also has a thermo-breaker circuit with a (back) reset button and a concentric L/R input level control and, and, and, 2x 50W of clean, modern, solid-state sound.
All this within a woody enclosure and "beautiful eurasian wood front panel".

Very similar to the Sansui BA-60, same features, same functions, same power output, same weight, so probably made by one for the other or by SOC or NDS which were then frequent Sansui (and Victor) factories.