Sansui AU 519 (1978-1980)

Specifications

Feature	Specification
Year of Production	1978-1980
Power Specifications	90W per channel into 8Ω (stereo), 110W per channel into 4Ω
Impedance	4-16Ω
Sensitivity	150mV (line), 2.5mV (MM phono)
Key Features	Dual power supply (separate transformers for each channel), DC amplification, Sansui's Diamond Differential circuit, direct-coupled OCL output, tone defeat switch, loudness control, pre-out/main-in jacks

Historical Significance

Part of Sansui's highly regarded 'X-Balanced' series, representing their transition to DC-coupled designs and advanced engineering. Known for exceptional build quality and innovative power supply design that reduces crosstalk between channels.

Sound Signature

Clean, detailed, and neutral with excellent transient response. Tight bass control, transparent midrange, and extended highs. Less colored than earlier Sansui models but still musical.

Maintenance and Restoration Tips

DC offset adjustment required (trimmer pots on driver boards), aging electrolytic capacitors (particularly in power supply), noisy switches and potentiometers, thermal drift in early production units

Collectibility and Market Value

Market Value: $400-$800 depending on condition and restoration status
Collectibility Rating: 8/10

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