Sansui AU 777D (1967-1969)

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

Name: Sansui AU 777D
Brand: Sansui

Specifications

Feature	Specification
Year of Production	1967-1969
Power Specifications	32W per channel (8Ω, both channels driven)
Impedance	4-16Ω
Sensitivity	Unknown
Key Features	Dual power supply, direct-coupled output stage, Sansui's Diamond Differential circuit, separate power transformers for left/right channels, phono stage with MM/MC capability, tone controls with defeat switch

Historical Significance

First amplifier to use Sansui's Diamond Differential circuit, considered a milestone in solid-state amplifier design, helped establish Sansui's reputation for high-quality audio equipment during the transition from tube to solid-state era

Sound Signature

Warm, detailed, musical sound with excellent midrange clarity, smooth highs, and tight bass response, often described as having tube-like qualities despite being solid-state

Maintenance and Restoration Tips

Aging electrolytic capacitors, noisy or scratchy potentiometers and switches, occasional transistor failure in driver stages, bulb replacement for indicators, may require deoxit cleaning of controls