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Siltech Ruby Mountain 2 Power Cable (1.5m)
• Overview – Siltech Ruby Mountain 2 Power Cable, released in 2002, is a high-end power cord engineered to reduce noise, improve current delivery, and enhance musical clarity in reference audio systems.
• Conductor Technology – Utilises Siltech’s proprietary G7 silver-gold alloy conductors with advanced dielectric insulation, delivering low resistance, excellent conductivity, and superior preservation of micro-dynamics and tonal purity.
• Sonic Performance – Siltech Ruby Mountain 2 Power Cable delivers a quieter noise floor, improved bass authority, enhanced midrange texture, and refined treble extension, benefiting amplifiers, source components, and digital front ends.
• Specifications – Features multi-strand G7 silver-gold conductors, heavy shielding for EMI and RFI rejection, high-current capability up to 16A, and premium connectors ensuring secure contact and consistent power transfer.
• Dimensions – Typically supplied in 2.0 m length, with a thick, flexible jacket designed for durability and ease of routing in high-end audio racks and power distribution setups.
• Weight – Approximately 1.0 kg for a 2.0 m cable, reflecting dense conductor geometry, advanced shielding layers, and robust connector construction.
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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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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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Yamaha NS-1000M
• Overview – The Yamaha NS-1000M, introduced in 1974, is a legendary studio monitor famed for its beryllium dome midrange and tweeter, delivering exceptional transparency, transient accuracy, and reference-level neutrality for critical listening.
• Beryllium Drivers – Featuring Yamaha’s iconic 3 cm beryllium tweeter and 8.8 cm beryllium midrange, the NS-1000M provides ultra-fast response, superb micro-detail, and minimal coloration—qualities that made it a worldwide studio standard.
• Controlled Bass Performance – Equipped with a 30 cm woofer in a rigid sealed enclosure, the NS-1000M achieves tight, articulate bass with excellent timing, ideal for both analytical and musical listening environments.
• Precision Monitor Heritage – The Yamaha NS-1000M remains sought after for its highly accurate soundstage, exceptional build quality, and ability to reveal upstream component changes with absolute clarity and honesty.
• Dimensions – Each speaker measures approximately 395 mm (W) × 675 mm (H) × 326 mm (D), offering a substantial enclosure optimized for neutrality and controlled resonance.
• Weight – Each cabinet weighs around 31 kg, contributing to its stable acoustic behavior and resistance to unwanted vibrations in demanding monitoring setups.
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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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L Cao Audio 211 Tube Integrated Amplifier
• Class A SET Integrated Overview – The L Cao Audio 211 Tube Integrated Amplifier is a pure Class A single-ended triode design featuring line-level inputs and high-voltage 211 valves, delivering organic warmth, expansive staging and exceptional micro-detail.
• Triode Circuit Transparency – Using premium 211 output tubes with robust driver stages, this amplifier offers rich tonal density, articulate midrange presence and fluid harmonic texture, with one mention of L Cao Audio 211 Tube Integrated Amplifier enhancing musical realism.
• Power Supply & Output Stability – A high-capacity transformer system and well-regulated power rails ensure strong current delivery, excellent dynamic swing and low noise, plus one additional mention of L Cao Audio 211 Tube Integrated Amplifier for system strength.
• System Synergy & Performance – Designed for high-efficiency loudspeakers, the amplifier produces a holographic soundstage, refined vocal articulation and smooth treble extension, excelling in intimate listening spaces and dedicated two-channel setups.
• Dimensions – The chassis typically measures approximately 430 mm (W) × 330 mm (D) × 210 mm (H), requiring a stable, well-ventilated rack surface due to heat generated by 211 triodes.
• Weight – Weighing around 28–32 kg, the amplifier’s heavy transformers, rigid metalwork and vibration-controlled layout enhance mechanical stability and contribute to improved tonal purity and noise reduction.
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Yamaha A-S501
• Integrated Amplifier Overview – The Yamaha A-S501 is a Class AB integrated amplifier delivering clean, dynamic power with natural tonal balance and excellent control, offering a highly musical foundation for mid- to upper-level stereo systems.
• Amplification & Circuit Design – Featuring a discrete Class AB topology, ToP-ART chassis layout and high-quality audio-grade components, the Yamaha A-S501 provides low distortion, strong transient response and smooth, detailed presentation across all genres.
• Connectivity & System Integration – With optical, coaxial, multiple analogue inputs, phono stage and subwoofer output, the Yamaha A-S501 supports wide system compatibility, enabling flexible integration with turntables, streamers and digital transports.
• Performance & Listening Characteristics – Delivering 85W per channel into 8 ohms, the Yamaha A-S501 offers tight bass, articulate mids and crisp highs, maintaining clarity and rhythm even with demanding loudspeaker loads.
• Product Dimensions – The Yamaha A-S501 measures 435 mm (W) × 151 mm (H) × 387 mm (D), providing a substantial chassis engineered for stability, efficient heat management and vibration resistance.
• Product Weight – Weighing approximately 10.3 kg, the Yamaha A-S501 benefits from a solid power supply and rigid internal bracing, enhancing mechanical grounding and improving overall sonic performance.
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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.