Muse Audio Service

Sansui AU-D9 Integrated Amplifier - Restored - $895

The Sansui AU-D9 is a highly regarded vintage stereo integrated amplifier produced by Sansui in Japan between 1981 and 1983. It represents a pivotal era where Sansui combined their legendary 1970s audio engineering with ultra-low distortion circuit designs of the early 1980s.

Known as a "sleeper" choice in the audiophile community, it offers massive power and performance at a fraction of the cost of Sansui's earlier Professional series.

Key Technical Specifications

Audiophiles value the AU-D9 for its exceptionally clean presentation, driven by its impressive damping factor and direct-coupled circuit design:

Power Output: 95 watts per channel into 8Ω (stereo)

Total Harmonic Distortion (THD): An ultra-low 0.005%

Damping Factor: 150 (excellent for tightly controlling larger speaker drivers)

Frequency Response: 10Hz to 20kHzSignal to Noise Ratio: 110dB (line), 90dB (MM), 74dB (MC)

Dimensions & Weight: 445 x 163 x 403 mm | 13.7 kg (approx. 30 lbs)

Notable Features: Super Feedforward Circuit: This model introduced advanced circuit designs optimized to systematically eliminate distortion before it reaches the outputs.

Premium Phono Stage: Features an outstanding integrated phono preamp supporting both Moving Magnet (MM) and Moving Coil (MC) cartridges, making it perfect for vinyl enthusiasts.

Unique Heat-Pipe Cooling: To save weight while maintaining extreme cooling efficiency, Sansui utilized a specialized fluid-filled heat pipe mechanism rather than massive aluminum block heatsinks.

Aesthetic Design: Features a distinct black brushed-aluminum faceplate, iconic early-'80s block fonts, and is often housed in a beautiful faux-rosewood wood veneer case

Kenwood KR-7600 Receiver - Restored - $1295

The Kenwood KR-7600 is a classic, highly regarded vintage AM/FM stereo receiver produced between 1976 and 1978 during the golden era of solid-state high-fidelity audio. It is known for its robust build quality, excellent aesthetics, and warm, punchy sound profile.

The KR-7600 sits comfortably in the upper tier of Kenwood's classic lineup, offering plenty of power to drive most standard speakers.

Power Output: 70 to 80 watts per channel into 8 ohms (stereo). It frequently measures even higher (~87 watts) on modern technician test benches.

Frequency Response: 20 Hz to 50 kHz.

Total Harmonic Distortion (THD): 0.5%.

Damping Factor: 45.

Speaker Connectivity: Supports up to three pairs of speakers (A, B, C).

Weight: Heavy build, weighing in at roughly 17.3 kg (38 lbs).

Key Features & Performance: The "Warm" Sound: Audiophiles and vintage collectors frequently note that the KR-7600 offers a warm, musical sound with a strong, punchy low-end.

Extensive I/O: It includes multiple source options: 2 Phono inputs for turntables, an Aux input, and 2 Tape loops. It can also be split to be used strictly as a pre-amplifier.

Aesthetics: Features a distinct, glowing 1970s silver-face display with dual signal meters.