Overview The Sansui AU-D7 is a 1980 integrated amplifier from the company's technically ambitious AU-D series. It combines Sansui's Diamond Differential circuit, a direct-coupled power section, MM and MC phono capability, extensive tone controls, and an LED peak-power display in a compact black-faced design. Why This Model Matters By 1980, Sansui was moving beyond the warm-toned, heavy silver-face amplifiers most associated with its 1970s catalog. The AU-D7 reflects that shift toward faster circuits, lower measured distortion, and a more modern visual identity. Sansui promoted its Diamond Differential design for its ability to supply drive current quickly and reduce transient intermodulation distortion, while the company's “Linear A” approach aimed to reduce switching and crossover artifacts without the heat and inefficiency of full Class A operation. Power specifications vary by market literature. Japanese documentation rates the AU-D7 at 65 watts per channel into 8 ohms, while export service literature lists 80 watts per channel. Either way, it was a capable mid-to-upper-line integrated amplifier rather than a lightweight budget model. Its phono section is especially notable, with selectable moving-magnet and moving-coil inputs at a time when MC compatibility was still far from universal. Highlights Released in 1980 Diamond Differential amplifier circuitry Linear A bias-control design MM and MC phono inputs Four-band tone control and source-direct flexibility LED digital peak-power display Who It’s For The AU-D7 suits a vinyl-focused listener who wants sophisticated early-1980s Sansui engineering in a manageable footprint. It is also an interesting choice for collectors tracing Sansui's evolution from classic 1970s receivers toward the faster, lower-distortion amplifier designs of the next decade.
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