Ming Da is one of the most famous Chinese hi-fi brands and its range of valve amplifiers now includes a wide choice of models. The MC368-BSE seen here uses KT90 output valves, a recently developed beam tetrode which, in this application, gives a claimed 70W/channel when used in ultralinear mode (a lower power triode mode is also available). The circuit uses fixed bias but as this is only adjustable using unlabelled internal controls the task is best left to a dealer; the two meters just show the output voltage at the 8ohm loudspeaker sockets.
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