Marantz AM/FM stereo receiver model 2230B. From the early 1970s. Rated at 30 watts per channel. This model has more features then the 2230. Features, Dolby FM, one phono input, two tape in/output, one auxiliary input, stereo mono switch, loudness on/off, muting, both tuning and signal meters, and separate bass, treble and mid controls. Classic stereo receiver.