Sansui AU 9900 (1973-1976)

Specifications

Feature	Specification
Year of Production	1973-1976
Power Specifications	60W per channel (8Ω), 70W per channel (4Ω), stereo
Impedance	4-16Ω
Sensitivity	Unknown
Key Features	Dual power supply, DC amplifier design, FET differential input stage, Sansui's X-Balanced circuit, phono equalizer with MC/MM compatibility, tone controls, loudness switch, dual power meters

Historical Significance

When Sansui unleashed the AU 9900 in 1973, they weren’t just building an amplifier—they were declaring a philosophy. As the crown jewel of their golden era, this integrated beast fused Japanese precision with audacious engineering, pioneering a fully DC-coupled signal path that banished coupling capacitors entirely. The result? A sonic purity that set a new benchmark for solid-state design, making the AU 9900 a legend among purists and a defining statement of 1970s audio innovation.

Sound Signature

The AU 9900 sounds neutral. It doesn't color the sound. It has sharp detail, easy dynamics, tight and articulate bass, and a wide, stable soundstage. Even by today's standards its clarity and control hold up, and it has a reputation as one of the most accurate amplifiers of its time.

Maintenance and Restoration Tips

After fifty years, these amps need some attention. The electrolytic capacitors, especially in the dual power supply, are long past their prime and should be replaced. DC offset drift is common and has to be adjusted after the recap. Pots and switches often get noisy from disuse and need cleaning or replacement. The dual power meters use bulbs that burn out, and LED retrofits are a popular fix. The AU 9900 is built like a tank, and a proper restoration should give it decades more service.

Collectibility and Market Value

Market Value: $800-$1,500 depending on condition and restoration status
Collectibility Rating: 9/10

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