A very well regarded British amp this OA21S is in excellent working order. This has the optional MM phono card installed. We found this amp remarkable considering its size. We were unfamiliar with the brand, but noticed the top notch build quality as soon as we opened it up. All caps are in good condition, and the unit has been cleaned and tested and is functioning as it should. Cosmetically the Faceplate is in good shape with some blemishes. The top came to us with the finish spotty and dull , but overall the unit presents itself very well. The markings on top for power, inputs and volume were long gone, so we printed some labels which can be easily removed if desired.
In doing some research, we found that these amps have a following and the S version had some upgrades from the earlier versions including an Alps Volume control and an upgraded Source switch.
The amp will be packed with great care using several inches of polyethylene foam on all sides of the unit.