Muse Audio Service

Muse Audio Service Vintage Audio Repair, Restoration and Sales,
Custom Stereo Design / Modification

Sansui AU-D9 Integrated Amplifier - Restored - $895The Sansui AU-D9 is a highly regarded vintage stereo integrated ampli...
05/29/2026

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 recei...
05/29/2026

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.

McIntosh MC75 Monoblock Pair and MX-110Z Preamplifier - RestoredSold As Full Set Only (Both MC75s and MX-110Z) - $11,995...
05/28/2026

McIntosh MC75 Monoblock Pair and MX-110Z Preamplifier - Restored

Sold As Full Set Only (Both MC75s and MX-110Z) - $11,995

Pairing the McIntosh MC75 monoblock amplifiers with the MX110z tuner-preamplifier is an iconic, highly sought-after vintage vacuum tube setup. Originally cross-marketed in the 1960s, this duo delivers the classic "McIntosh midrange magic" and warmth, while driving most vintage and modern speakers with remarkable authority.

Component Overview:

McIntosh MC75: A pair of 75-watt vacuum tube monoblock amplifiers. Renowned for their robust transformers and excellent low-frequency control.

McIntosh MX110z: A legendary vacuum tube stereo preamplifier combined with an FM multiplex tuner. The "z" designation indicates the later revision of the MX110, which features upgraded glass panel lettering and improved reliability over the earliest units.

Strengths of the Pair

All-Tube Phono Stage: The MX110z features a highly regarded dual-phono stage (for Moving Magnet cartridges) that complements the warm tube sound of the MC75s.

Synergy: Since they were designed in the same era, the MX110z’s preamp output perfectly matches the input impedance and sensitivity requirements of the MC75s.

Aesthetics: The striking black and gold anodized faceplates, paired with the glowing tubes make this setup a visual centerpiece.

Marantz 2238 Receiver - Restored - $1695 The Marantz 2238 is a classic, highly collectible 38-watt per channel vintage s...
05/23/2026

Marantz 2238 Receiver - Restored - $1695

The Marantz 2238 is a classic, highly collectible 38-watt per channel vintage stereophonic receiver manufactured by Marantz between 1977 and 1979. Renowned for its distinctive "Marantz house sound"—characterized by a warm, smooth midrange and punchy low end—this solid-state receiver remains a favorite among vinyl and vintage audio enthusiasts.

Key Specifications & Features
Power Output: 38 watts continuous RMS per channel into 8 ohms, though reviewers note its direct-coupled design behaves more robustly like a 60-watt unit.

Acoustic Design: Features a Direct Coupled design which delivers an excellent low-frequency response, superior damping, and wide power bandwidth.

Built-in Inputs: Equipped with a premium Phono preamp stage for turntables, AM/FM radio tuner with the signature Marantz gyro-touch tuning wheel, and auxiliary/tape loops for external inputs.

Total Harmonic Distortion (THD): Exceptionally low distortion at 0.08%, contributing to its clear, fatiguing-free musical playback over long listening hours.

JVC JL-B31 Direct Drive Turntable With New Ortofon Red Cartridge - Restored - $695The JVC JL-B31 (also known as the Vict...
05/23/2026

JVC JL-B31 Direct Drive Turntable With New Ortofon Red Cartridge - Restored - $695

The JVC JL-B31 (also known as the Victor JL-B31 in Japan) is a vintage, 2-speed direct-drive turntable released around 1975. Highly regarded for its heavy build, classic wood-grain plinth, and excellent performance, it is a prized collector's piece today.

Specifications & Features
Drive Type: Direct Drive (brushless DC servo motor)
Speeds: 33.3 and 45 RPM
Platter: 30cm die-cast aluminum
Wow and Flutter: 0.05% WRMS
Tonearm: S-shaped, static-balance type
Headshell: Standard JIS 4-pin (allows for easy cartridge upgrade

Technics SP-25 Broadcast Turntable With SH-15B3 Base and Audio-Technica AT-1503 Tonearm. - Restored - $1495 The Technics...
05/22/2026

Technics SP-25 Broadcast Turntable With SH-15B3 Base and Audio-Technica AT-1503 Tonearm. - Restored - $1495

The Technics SP-25 is a legendary, professional-grade, direct-drive turntable motor unit introduced by Matsush*ta (Panasonic) around 1979. Designed primarily for broadcast studios, radio stations, and high-end audiophiles, it was sold as a standalone "phono motor" unit. This configuration required users to supply their own plinth (base) and tonearm.

Key Technical Specifications
Drive Method: Quartz-locked direct drive.
Speeds: 33-1/3 and 45 RPM.
Pitch Control: Total quartz-locked variable adjustment
Braking System: Electronic brake system for rapid stops.
Construction: Precision, heavy-duty, non-resonance die-cast aluminum platter and chassis

The Technics SH-15B3 is a heavy duty, high-quality turntable base released by Technics in 1981. It was specifically engineered to house standalone direct-drive motor units like the Technics SP-15 and Technics SP-25.

Key Features
Acoustically Dead Material: Built using a heavy composite rubber material that minimizes external feedback and dampens resonance.

Matte Black Aesthetic: Features a completely black, utilitarian finish.

Isolation Mechanics: Features four individually spring-loaded feet designed to suppress ambient room vibrations.

Modular Tonearm Board: Accommodates customizable armboards, allowing users to mount premium tonearms such as the Technics EPA-100 or various Audio-Technica models.

Acrylic Dust Cover: Shipped originally with a clear, detachable acrylic cover isolated via the rubber base.

Companion Hardware
Because the SH-15B3 is strictly a base, it is almost always found on the market paired with specific legacy components:

Tonearms: Frequently paired with broadcast or audiophile arms.

The Audio-Technica AT-1503 is a highly regarded, vintage static-balance universal tonearm originally introduced in 1964. Built primarily for professional broadcast and heavy-duty studio applications, it is closely related to the professional ATP-12T arm. It is celebrated by audiophiles for its massive build quality, structural rigidity, and superb tracking capability with low-compliance cartridges

Marantz 2216 Receiver, Near Mint - Restored - $1195The Marantz 2216 is a highly sought-after vintage stereophonic receiv...
05/21/2026

Marantz 2216 Receiver, Near Mint - Restored - $1195

The Marantz 2216 is a highly sought-after vintage stereophonic receiver produced from 1977 to 1980. It is celebrated for delivering the iconic Marantz warm, analog sound and timeless silver-face aesthetic.

Key Specifications
Power Output: 16 watts per channel into
8Ω (stereo)
Frequency Response:
20Hz to 20kHz
Total Harmonic Distortion: 0.5%
Tuning Range: FM, MW (AM)
Features: Gyro-touch tuning, Phono input, two tape ins/outs, Aux input, Loudness on/off, and high filter
Differences: 2216 vs. 2216B
Marantz later released an updated 2216B model. While the specifications remained largely the same, the B-model featured several cosmetic and layout changes:
Dial Face: The original 2216 has a dark dial face, whereas the 2216B has a silver/white dial face.
Controls: The balance control on the 2216 is a slider, while the 2216B uses a k**b. Speaker selection on the 2216 is a k**b, which became a push-button on the 2216B

NAD 6100 Casette Deck - Restored, Near Mint, With Box - $495 The NAD 6100 is a vintage, high-performance two-head stereo...
05/21/2026

NAD 6100 Casette Deck - Restored, Near Mint, With Box - $495

The NAD 6100 is a vintage, high-performance two-head stereo cassette deck originally released around 1990 as part of NAD's premium Monitor Series. It is widely regarded by vintage audio collectors on community platforms like Tapeheads.net as the "two-head brother" to the flagship three-head NAD 6300. It combined the brand's classic minimalist industrial design with high-fidelity audio engineering meant to rival more expensive decks.

Key Technical Specifications
Configuration: 2-Head design featuring a high-quality permalloy playback/recording head and a ferrite erase head.
Noise Reduction: Equipped with Dolby B and Dolby C systems.
Dynamic Equalization: Features NAD's proprietary DYN-EQ dynamic equalizer system, which optimizes high-frequency headroom during recording.
Tape Compatibility: Full support for Normal (Type I), CrO2/Chrome (Type II), and Metal (Type IV) cassette formulations.
Aesthetics: Signature dark gray chassis accented with a green power button, yellow play button, and red record button.

Audio Performance & Character
True to the philosophy of the NAD Monitor Series, the 6100 delivers a highly neutral, warm, and natural soundstage. Enthusiasts frequently praise it for delivering exceptionally deep bass and great phase stability. While it lacks a third head for real-time monitoring while recording, its high-quality electronics make it one of the top-performing two-head decks of its era

Bose 901 Mid Century Modern Speakers, With Original Metal Stands and Series 901 Active Equalizer - Restored - $595
05/21/2026

Bose 901 Mid Century Modern Speakers, With Original Metal Stands and Series 901 Active Equalizer - Restored - $595

Pioneer XL-A700S - Direct Drive Full-Automatic Turntable - With New Ortofon Blue Cartridge - Restored - $1495The Pioneer...
05/21/2026

Pioneer XL-A700S - Direct Drive Full-Automatic Turntable - With New Ortofon Blue Cartridge - Restored - $1495

The Pioneer XL-A700S is a premium, vintage direct-drive turntable released in 1979 during the "Golden Era" of Japanese high-fidelity audio manufacturing. It is highly regarded by collectors for its exceptional build quality, sleek aesthetic, and precise engineering.

Quick Facts:
Drive System: Direct drive.

Motor Type:
Quartz PLL DC servo Hall motor.
Speed Options: 33.3 RPM and 45 RPM.

Market Variant:
The XL-A700 series is the Japanese domestic market (JDM) equivalent of the widely popular Pioneer PL-570 sold in Western markets.

Key Technical & Design Features:
Advanced Quartz PLL Motor
The turntable utilizes a high-torque Quartz PLL (Phase Locked Loop) DC servo Hall motor. This technology continuously monitors and adjusts rotation speed to virtually eliminate wow and flutter, providing exceptionally stable playback speeds.

Industrial Design & Aesthetics:
Unlike the wood-grain finishes seen on many of its contemporaries (like the standard PL-570), the "S" suffix often denotes a distinct finish style, including clean lines and a retro-modern appearance. It features built-in speed monitoring systems, precise control switches, and a premium tonearm lift mechanism.

Tone Arm and Hardware:
The unit is equipped with a highly sensitive S-shaped tonearm designed to maximize trackability and minimize distortion. Replacement parts like replica tonearm guide lift bars and custom acrylic aftermarket dust covers are still actively produced by third-party specialists like IntoVinyl to keep these legacy units operational

Nikko Alpha 220 DC Power Amplifier - Restored - $495Nikko Beta 30 Preamplifier - Restored - $295 Pair - $695The Nikko Al...
05/20/2026

Nikko Alpha 220 DC Power Amplifier - Restored - $495
Nikko Beta 30 Preamplifier - Restored - $295
Pair - $695

The Nikko Alpha 220 power amplifier and Beta 30 preamplifier are a classic, highly capable vintage pairing. This setup combines a robust 130-watt-per-channel amplifier with a versatile control unit.

Key Specifications:

Nikko Alpha 220 Power Amp: Delivers roughly
130WPC into 8Ω, boasting low distortion and plenty of headroom to drive most vintage or modern speakers.

Nikko Beta 30 Preamp: Features a highly regarded built-in phono stage, extensive tone controls, and various tape/aux inputs.

Pairing Considerations:

System Synergy: While they were factory-matched companions, audiophile consensus suggests the Alpha 220 is the stronger component. Upgrading the Beta 30's components to modern audio-grade parts can drastically improve the system's performance.

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5040 Jackson Road Suite 3
Ann Arbor, MI
48103

Opening Hours

Tuesday 11am - 6pm
Wednesday 11am - 6pm
Thursday 11am - 6pm
Friday 11am - 7pm
Saturday 11am - 5pm

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+17345455775

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