An unusual offering from Sony, basic controls, low profile, and MOSFET output devices. These are really a very nice amplifier, probably not in their ES line as they are low powered and relatively simple, no tone controls, and a light cabinet. I believe they sold for a low price when new. However these sound better than than much pricier amps including a host of other Sony's! A typical warm Mosfet sound with great bass control and clear detailed mid-range and treble. This example needed a new output stage on one channel but there were few other components needed changing. The phono stage is quite decent also despite being made later into the CD era, not an afterthought but a real addition that can be used. Top quality components are used throughout.