This is the Bose Spatial Control Receiver which doesn't seem to have a model number on it but I believe it is considered model 551. It puts out 100 watts per channel and has a built in EQ for the Bose 901 series IV speakers. Bose Spatial Control Receiver. Stereo AMFM Receiver (1979) (1 review) Specifications. This service manual doesn't cover the early model with the tone controls. The most noticeable difference is the preamp board.
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