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Isotek Sigma Power Conditioner
• Overview – The Isotek Sigma Power Conditioner, released in 2015, is a solid-state mains conditioning component engineered to dramatically reduce electrical noise while maintaining unrestricted current delivery for high-performance audio systems.
• Power Architecture – Built around IsoTek’s advanced delta-filtering topology, the Isotek Sigma Power Conditioner isolates connected components, eliminating differential and common-mode noise while preventing cross-contamination between digital sources and high-current amplifiers.
• Sonic Performance – By lowering the system noise floor, the Isotek Sigma Power Conditioner improves bass articulation, dynamic contrast, image stability, and low-level resolution, especially noticeable in revealing reference-grade analogue and digital systems.
• Specifications – Rated for high-current audio use, featuring multiple individually filtered outlets, star-earthed grounding, internal copper bus bars, RFI/EMI suppression, and surge protection without dynamic compression or current limiting.
• Dimensions – Measures approximately 445 mm (W) × 150 mm (H) × 350 mm (D), designed for standard hi-fi racks while allowing sufficient ventilation and cable clearance for complex multi-component installations.
• Weight – Weighs roughly 15 kg, reflecting substantial internal filtering networks, shielding, and mechanical damping that contribute to stable, resonance-free operation and long-term electrical reliability.
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Isotek Evo3 Power Conditioner
• Product Overview – The Isotek Evo3 Power Conditioner (2016) is a solid-state mains conditioning solution designed to reduce electrical noise, improve current delivery, and enhance overall system clarity in high-resolution hi-fi setups.
• Filtering Topology – Employing IsoTek’s multi-stage delta filter network, the Isotek Evo3 Power Conditioner effectively removes both common-mode and differential-mode noise while preventing cross-contamination between connected audio components.
• Sonic Improvements – Users typically experience lower noise floor, improved micro-detail, tighter bass control, and greater soundstage depth, especially when used with sensitive digital sources and analogue front-end components.
• Specifications – Features high-current audio outlets, internal copper bus bars, star-earthed grounding, RFI/EMI suppression, and surge protection, all engineered to avoid current compression and preserve amplifier dynamics.
• Dimensions – Measures approximately 445 mm wide × 90 mm high × 305 mm deep, sized to integrate easily into standard hi-fi racks or equipment shelves without compromising ventilation or cable management.
• Weight – Weighs roughly 8 kg, reflecting robust internal filtering components, shielding, and mechanical construction designed to ensure stability, durability, and long-term performance consistency.
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Sumiko Rainier MM Cartridge
Product Overview – The Sumiko Rainier MM Cartridge (2018) is an entry-level moving-magnet design focused on musical balance, forgiving playback, and reliable performance, making it ideal for both new vinyl listeners and budget-conscious analogue systems.
• Stylus & Generator Design – Fitted with a bonded elliptical stylus and Sumiko’s carefully tuned generator, the Sumiko Rainier MM Cartridge delivers stable tracking, reduced surface noise, and consistent groove contact across a wide range of record conditions.
• Sonic Character – Voiced for warmth and smoothness, this cartridge emphasizes an easygoing tonal balance with rounded bass, relaxed treble, and cohesive midrange presentation suitable for long listening sessions.
• Specifications – Moving-magnet output approximately 5.0 mV, recommended load 47 kΩ, channel separation around 22 dB, frequency response roughly 15 Hz–25 kHz, optimized for lightweight to medium-mass tonearms.
• Dimensions – Standard half-inch mount cartridge body with compact Oyster-series proportions, ensuring straightforward alignment and compatibility with most headshells and tonearms used on entry-level and midrange turntables.
• Weight – Approximately 6.5 g, allowing easy balancing on most tonearms while maintaining stable tracking and consistent stylus pressure during playback.
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Sumiko Moonstone MM Cartridge
• Product Overview – The Sumiko Moonstone MM Cartridge (2018) is a high-performance moving-magnet design engineered for musical warmth, refined detail, and easy system matching with standard 47 kΩ phono inputs.
• Stylus & Generator Design – Utilizing a nude elliptical stylus and carefully tuned generator, the Sumiko Moonstone MM Cartridge delivers excellent groove contact, reduced distortion, and smooth tracking across demanding inner-groove passages.
• Sonic Character – Known for its natural midrange, controlled bass weight, and non-fatiguing treble, this cartridge emphasizes musical flow and tonal coherence over exaggerated detail or analytical presentation.
• Specifications – Moving-magnet output approximately 3.0 mV, recommended load 47 kΩ, channel separation around 30 dB, frequency response roughly 12 Hz–30 kHz, optimized for medium-mass tonearms.
• Dimensions – Standard half-inch mount cartridge body with compact proportions typical of Sumiko Oyster-series designs, allowing straightforward alignment and compatibility with a wide range of headshells and tonearms.
• Weight – Approximately 6.5 g, providing stable tracking performance while maintaining compatibility with most counterweight ranges and ensuring consistent stylus contact across varying record conditions.
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Sumiko Pearl MM Cartridge
• Product Overview – The Sumiko Pearl MM Cartridge is a classic moving-magnet phono cartridge known for smooth, musical analogue playback, delivering balanced highs, defined mids, and rhythmic clarity that elevates everyday vinyl listening.
• Design & Engineering – Featuring a precision 0.3 × 0.7 mil elliptical stylus and high-purity copper coils, the Pearl’s generator and compliance are optimized for wide frequency response, detail retrieval, and stereo imaging.
• Analogue Character – With its evenly balanced tonal presentation and broad 12 Hz‒30 kHz response, the cartridge offers engaging bass, articulate midrange, and a forgiving high end for long listening sessions.
• Specifications – Moving Magnet design with ~4.0 mV output at 1 kHz, load impedance ~47 kΩ, compliance ~12×10⁻⁶ cm/dyn, and recommended tracking force ~2.0 g — ideal for most MM phono stages.
• Dimensions – Compact body measuring approx. 11.6 × 20.26 × 27.24 mm with bagged mounting and removable stylus, enabling easy setup on standard tonearms.
• Weight – Weighs about 6.0 g, balancing low mass for stability with sufficient tracking capability for sonic nuance and compatible tracking on a broad range of turntables.
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Sumiko Oyster MM Cartridge
• Product Overview – Sumiko Oyster MM Cartridge, a classic moving-magnet phono cartridge, offers a smooth, musical analogue presentation ideal for beginners or vinyl upgraders seeking superior performance over stock cartridges.
• Design & Performance – The Sumiko Oyster MM Cartridge features a bonded spherical stylus and rugged alloy cantilever, delivering engaging midrange, gentle high-frequency extension, and improved groove detail over entry-level designs.
• Analogue Character – The cartridge’s balanced tonal signature produces natural warmth and layered sound, making the Oyster especially enjoyable for everyday listening across diverse music genres.
• Specifications – Moving Magnet design with ~5.0 mV output, 30 Hz–20 kHz frequency response, recommended tracking force ~2.3 g, compliance ~12×10⁻⁶ cm/dyn, and 47 kΩ load impedance for broad MM compatibility.
• Dimensions – Compact and lightweight at approximately 18.2 mm × 18 mm × 30.5 mm, the Sumiko Oyster MM Cartridge suits most tonearms with standard half-inch mount and maintains rigid structural integrity.
• Weight – Weighing about 5.3 g, the cartridge’s low mass aids stable tracking and broad tonearm compatibility while remaining easy to align and adjust on a wide range of turntables.
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Sumiko Blue Point No. 3 Low MC Cartridge
• Product Overview – The Sumiko Blue Point No. 3 Low MC Cartridge is a premium low-output moving-coil phono cartridge designed for refined analogue playback, offering enhanced detail, tonal richness, and excellent tracking for serious vinyl enthusiasts.
• Stylus & Generator Design – Featuring an advanced line-contact stylus and precision generator assembly, the Blue Point No. 3 Low MC Cartridge delivers superior groove contact, low distortion, and improved retrieval of microdetail from complex vinyl passages.
• Analogue Character – This cartridge is known for its balanced tonal signature, controlled bass extension, articulate midrange, and smooth treble, making it well suited to high-quality tonearms and robust phono stages.
• Specifications – Low MC output around ~0.3–0.5 mV, recommended load impedance typically between 100–200 ohms, compliance optimised for medium-mass tonearms, and wide frequency response for accurate music reproduction.
• Dimensions – Compact body measuring approximately typical MC cartridge footprint (~12 mm × 18 mm × 30 mm), engineered for easy alignment and secure mounting on standard ½-inch tonearm headshells without compromise.
• Weight – Weighs roughly 7 g, offering a low-mass yet stable tracking platform that supports accurate groove following and consistent channel balance across a range of record pressings.
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Audio Research LS7 Pre Amp
• Overview – Audio Research LS7 Pre Amp, released in 1996, is a tube line-stage preamplifier using Class A operation, designed for purist analog systems requiring transparency, musical flow, and classic Audio Research voicing.
• Circuit Design – Employs a minimalist single-ended tube topology with premium passive components, prioritizing low noise, wide bandwidth, and tonal accuracy while preserving harmonic richness and dynamic contrast.
• Sonic Performance – Audio Research LS7 Pre Amp delivers open midrange realism, expansive imaging, and natural transient decay, excelling with acoustic recordings and high-resolution analog sources.
• Specifications – Utilizes four 6922 dual-triode tubes, offers 12 dB gain, 600-ohm output impedance, five line-level inputs, tape loop, and a frequency response extending well beyond the audible band.
• Dimensions – Approximately 483 mm (W) × 140 mm (H) × 330 mm (D), featuring the classic Audio Research brushed aluminum faceplate and robust steel chassis construction.
• Weight – Approximately 8.6 kg, reflecting quality transformers, tube complement, and solid internal layout designed for longevity and stable thermal operation.
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Audio Research VSI60 with KT120 Tubes
• Overview – Audio Research VSI60, released in 2013, is a Class AB tube integrated amplifier using KT120 output tubes, combining preamplification and power amplification to deliver refined tube musicality with modern drive capability.
• Amplifier Topology – Designed with a fully balanced tube signal path, it delivers exceptional transparency, wide dynamic range, and authoritative bass control, bridging classic Audio Research voicing with contemporary loudspeaker compatibility.
• System Integration – Audio Research VSI60 with KT120 Tubes offers multiple line-level inputs and balanced XLR connectivity, making it a flexible centerpiece for high-end analog and digital systems seeking coherence, scale, and tonal accuracy.
• Specifications – Rated at 50 watts per channel into 8 ohms, employs four KT120 output tubes, 6H30 driver tubes, fully balanced circuitry, wide bandwidth response, and high-current power supply for stable load handling.
• Dimensions – Approx. 483 mm (W) × 197 mm (H) × 394 mm (D), featuring Audio Research’s contemporary industrial design with effective ventilation and compatibility with standard hi-fi equipment racks.
• Weight – Approximately 23 kg, reflecting substantial transformers, robust chassis construction, and premium internal components essential for reliable thermal management and consistent high-performance tube operation.
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Audio Research CL60 Tube Power Amplifier
• Overview – Audio Research CL60 Tube Power Amplifier, released in 1998, is a pure Class AB tube power amplifier using vacuum-tube output stages, delivering refined harmonic richness, excellent control, and the signature Audio Research balance between power and musicality.
• Tube Power Design – Designed for demanding audiophile systems, it offers authoritative bass grip and expansive soundstaging, while preserving midrange liquidity and treble openness that tube enthusiasts value in reference two-channel setups.
• System Synergy – The Audio Research CL60 Tube Power Amplifier integrates seamlessly with both tube and solid-state preamplifiers, excelling with revealing loudspeakers and providing stable performance across varied impedance loads and musical genres.
• Specifications – Rated at 60 watts per channel into 8 ohms, uses 6550 output tubes, fully balanced topology, high-current power supply, wide bandwidth response, and substantial output transformers for low distortion and dynamic headroom.
• Dimensions – Approx. 483 mm (W) × 267 mm (H) × 432 mm (D), featuring Audio Research’s classic chassis design with ample ventilation for reliable tube operation and compatibility with standard hi-fi racks.
• Weight – Approximately 29 kg, reflecting heavy transformers, rugged internal construction, and extensive shielding essential for stable thermal performance and long-term reliability in high-power tube amplification.
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Audio Research LS16 Tube Preamp
• Overview – Audio Research LS16 Tube Preamp, released in 1999, is a fully balanced solid-state and tube hybrid line-stage preamplifier using vacuum-tube gain stages to deliver classic Audio Research neutrality with musical warmth and dynamic authority.
• Circuit Design – Built around a dual-triode tube topology with balanced architecture, it offers exceptional transparency, wide bandwidth, and low noise, making it ideal for revealing power amplifiers and high-resolution source components.
• System Matching – The Audio Research LS16 Tube Preamp excels in resolving micro-detail and soundstage depth while maintaining tonal balance, pairing especially well with both tube and solid-state power amplifiers in reference-level systems.
• Specifications – Utilises four 6922 dual-triode tubes, fully balanced outputs, multiple single-ended and XLR inputs, low output impedance, and high voltage regulation for stable operation and consistent sonic performance.
• Dimensions – Approx. 483 mm (W) × 133 mm (H) × 356 mm (D), housed in Audio Research’s classic brushed-aluminium chassis designed for proper ventilation and rack-friendly installation.
• Weight – Approximately 10 kg, reflecting a robust internal power supply, shielded circuitry, and solid mechanical construction that supports long-term reliability and low microphonic behaviour.
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Unison Research Triode 20
• Overview – Unison Research Triode 20, released in 2003, is a pure Class A, tube-based integrated amplifier using triode operation, delivering low-power purity with exceptional tonal richness and harmonic realism.
• Triode Amplification – Designed around triode-connected output tubes, it prioritises linearity and natural timbre, producing an intimate, fluid presentation that excels with high-efficiency loudspeakers and acoustic music reproduction.
• Italian Craftsmanship – The Unison Research Triode 20 features hand-built construction, point-to-point wiring, and a solid wooden chassis, combining traditional valve engineering with distinctive Italian aesthetic refinement and long-term reliability.
• Specifications – Rated at approximately 20 watts per channel into 8 ohms, employs triode-configured EL34 output valves, tube rectification, minimalist circuit topology, and short signal paths to preserve signal purity and dynamic coherence.
• Dimensions – Approx. 420 mm (W) × 200 mm (H) × 360 mm (D), with a compact yet substantial chassis designed to accommodate tube ventilation while fitting comfortably on standard hi-fi equipment racks.
• Weight – Approximately 25 kg, reflecting heavy transformers, solid hardwood enclosure, and robust internal components essential for stable Class A tube operation and mechanical resonance control.
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Audio Research CL60
• Audio Research CL60 Overview – The Audio Research CL60, released in the early 1990s, is a Class AB push-pull tube power amplifier using 6550 output tubes, delivering the brand’s signature clarity, control, and musical refinement.
• Refined Tube Architecture – Employing four 6550 output tubes and 6FQ7/6922 driver stages, the CL60 offers excellent harmonic balance, open midrange presence, and extended treble, ideal for detailed yet natural high-end listening.
• Dynamic and Controlled Power – The Audio Research CL60 provides approximately 60W per channel with strong current delivery, enabling it to drive a wide range of speakers while maintaining superb transient speed and low noise performance.
• Classic ARC Build Quality – Featuring robust transformers, solid chassis construction, and meticulously designed circuitry, the CL60 exemplifies Audio Research reliability, long-term tube stability, and consistent high-fidelity performance.
• Dimensions – Approx. 480 mm (W) × 135 mm (H) × 430 mm (D), offering a substantial chassis size that accommodates generous power supply architecture and proper ventilation for tube operation.
• Weight – Around 22–24 kg, reflecting its heavy power transformer and durable steel frame, contributing to enhanced mechanical damping and stable sonic performance.
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Spendor D7
• Spendor D7 Overview – The Spendor D7, launched in 2014, is a refined British floorstander featuring Spendor’s Linear Flow Port and advanced driver technology, delivering exceptional clarity, speed, and natural musical expression across all genres.
• Advanced Driver Technology – Featuring a LPZ (Linear Pressure Zone) tweeter and EP77 polymer mid/bass cones, the Spendor D7 achieves superb coherence, extended treble, and a neutral tonal balance with outstanding resolution.
• Dynamic and Controlled Sound – The Spendor D7 provides excellent transient accuracy, deep yet controlled bass, and impressive imaging, making it suitable for both small and large rooms seeking high-performance musical realism.
• Elegant British Craftsmanship – Precision-built cabinets with real-wood veneers, internal bracing, and the Linear Flow Port system minimise coloration and deliver consistent performance even when placed close to room boundaries.
• Dimensions – Approx. 980 mm (H) × 192 mm (W) × 333 mm (D), giving the D7 a slim, modern aesthetic that fits elegantly into a wide range of listening environments.
• Weight – Around 21 kg per speaker, providing cabinet rigidity and stability for improved bass control and lower distortion.
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Audio Research LS3B Preamplifier and D120 Stereo Amplifier
• System Overview – The Audio Research LS3B Preamplifier and D120 Stereo Amplifier, released in the early 1990s, form a solid-state Class AB pairing known for exceptional transparency, dynamic authority, and the classic Audio Research house sound with precise tonal balance.
• High-Resolution Line Stage – The LS3B uses a fully balanced, low-noise circuit with wide bandwidth and premium discrete components, delivering excellent detail retrieval, stable imaging, and superior channel separation for accurate two-channel reproduction.
• Powerful Class AB Amplification – The Audio Research D120 Stereo Amplifier provides 120W per channel of clean, controlled Class AB power with high-current capability, enabling confident drive of demanding loudspeakers while maintaining composure and refinement.
• Exceptional System Synergy – Together, the Audio Research LS3B Preamplifier and D120 Stereo Amplifier offer fast transients, low distortion, and highly coherent musical flow, making the combination ideal for revealing loudspeaker systems in dedicated listening rooms.
• Dimensions – LS3B: approx. 480 mm (W) × 130 mm (H) × 330 mm (D). D120: approx. 480 mm (W) × 180 mm (H) × 430 mm (D). Designed to fit standard Audio Research rack spacing.
• Weight – LS3B: approx. 7 kg. D120: approx. 27 kg. The amplifier’s heavy transformer and robust chassis provide excellent mechanical damping for stable long-term performance.
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Audio Research LS16 MK2
• Preamplifier Overview – The Audio Research LS16 MK2, released in 2002, is a high-performance tube line-stage preamplifier using 6H30 valves, offering superior transparency, dynamic refinement, and tonal purity for resolving two-channel systems.
• 6H30 Tube Line Stage – The Audio Research LS16 MK2 employs the highly regarded 6H30 “super tube,” delivering wide bandwidth, low noise, and excellent microdynamic expression, ensuring effortless musical flow and holographic soundstaging.
• Precision Circuit Engineering – With dual-mono architecture, premium components, and optimized signal paths, the LS16 MK2 achieves exceptionally low distortion and high channel separation, resulting in improved clarity and natural tonal accuracy.
• Versatile System Integration – The Audio Research LS16 MK2 provides multiple single-ended and balanced outputs, allowing flexible pairing with tube or solid-state amplifiers while maintaining stable output impedance and consistent sonic performance.
• Dimensions – Approx. 480 mm (W) × 140 mm (H) × 330 mm (D). Standard Audio Research chassis format integrates easily into full-size hi-fi racks.
• Weight – Approx. 7.7 kg, featuring a rigid chassis design that reduces vibration and supports the stability and longevity of the sensitive tube circuitry.
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Audio Research LS15
Tube Line-Stage Refinement – The Audio Research LS15 is a high-performance tube line-stage preamplifier using Class A circuitry, delivering exceptional musicality, holographic imaging, and smooth, natural tonal balance for serious audiophile systems.
• Premium Tube Gain Stages – Equipped with 6922/6DJ8 tubes, the Audio Research LS15 offers low noise, excellent linearity, and superb microdynamic expression, producing a transparent yet harmonically rich sonic presentation.
• High-Current Output Design – The LS15 provides strong drive capability and wide bandwidth, ensuring superb system matching with solid-state or tube power amplifiers while maintaining stability, clarity, and dynamic control.
• ARC Engineering Precision – Advanced power regulation, discrete circuitry, and fully balanced topology contribute to the LS15’s low distortion, excellent channel separation, and refined musical performance across all genres.
• Dimensions – Approx. 480 mm (W) × 330 mm (D) × 140 mm (H). Classic ARC chassis design ensures proper ventilation and secure rack integration.
• Weight – Around 8.5 kg, providing a rigid, low-resonance enclosure that enhances tube stability and reduces microphonic noise for cleaner signal reproduction.
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Audio Research I/50
• Integrated Tube Design – The Audio Research I/50 is a Class A/B tube integrated amplifier featuring optional DAC and phono modules, offering refined musicality, smooth harmonic texture, and exceptional versatility for modern audiophile systems.
• Tube Performance Transparency – With 6550WE power tubes and 6922 input stages, the Audio Research I/50 delivers excellent linearity, low distortion, and a rich tonal balance that enhances microdetail, depth, and dynamic expression.
• Upgradeable Architecture – The I/50 provides modular expansion for digital and analogue inputs, allowing Audio Research I/50 owners to tailor system functionality while preserving ARC’s signature sonic refinement and long-term reliability.
• Precision Build Quality – Handcrafted in Minnesota, the I/50 features stabilized power regulation, quiet cooling, and intuitive capacitive controls, ensuring consistent performance, operational stability, and superior tube lifespan.
• Dimensions – Approx. 419 mm (W) × 337 mm (D) × 196 mm (H), with a compact footprint optimized for rack placement while maintaining proper airflow for tube cooling.
• Weight – Around 18 kg, offering solid mechanical stability that reduces vibration, enhances tube performance, and contributes to the amplifier’s exceptionally low noise floor.
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Audio Research is an American high-end audio brand widely associated with advancing valve-based amplification through modern engineering. Combining traditional tube principles with contemporary circuit design, the brand focuses on scale, transparency, and dynamic realism without sacrificing tonal integrity.
Audio Research components are designed with serviceability and longevity in mind, which is why pre-owned Audio Research equipment continues to hold strong appeal. Well-maintained pre-owned units often remain competitive with current designs, particularly in systems built around musical realism and dynamic expression.
Across Singapore, Malaysia, and Southeast Asia, Audio Research is respected among audiophiles seeking reference-grade valve electronics. On SoundTribeAsia, Audio Research equipment — new and pre-owned — is offered by verified dealers, providing trusted access through a curated regional marketplace.