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Harman Kardon Citation 16 Power Amplifier
• Product Overview – The Harman Kardon Citation 16 Power Amplifier, released in 1976, is a solid-state Class AB design delivering high-current performance, wide bandwidth, and the authoritative control that defined Harman Kardon’s classic Citation series.
• High-Current Performance – Designed by Matti Otala, this amplifier is renowned for its low TIM distortion, fast transient response, and effortless dynamic swing, making it especially capable with demanding loudspeaker loads.
• Build & Sonic Character – The Harman Kardon Citation 16 Power Amplifier features a dual-mono layout with oversized power supply, producing a neutral, powerful, and tightly controlled sound that remains respected among vintage audiophiles.
• Specifications – Rated at approximately 150 watts per channel into 8 ohms and stable into 4 ohms, with wide frequency response and very low distortion for its era, emphasizing clean, unstrained power delivery.
• Dimensions – Measures approximately 445 mm (W) × 178 mm (H) × 406 mm (D), occupying a full-width chassis with substantial depth to accommodate its large transformer and heat dissipation requirements.
• Weight – Weighs roughly 27 kg, reflecting the heavy-duty power transformer, robust output stage, and solid steel chassis construction typical of high-end amplifiers from the Citation lineage.
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Krell KAV-300I Integrated Amplifier
• Product Overview – The Krell KAV-300I Integrated Amplifier was released in 1999 as a solid-state Class A/AB design, combining preamplifier and high-current power amplification for authoritative control and classic Krell drive.
• Amplification Performance – Delivering exceptional grip and dynamics, the amplifier provides effortless current delivery, wide bandwidth, and low noise, making it ideal for demanding loudspeakers and high-resolution analogue or digital sources.
• Build & Sonic Character – The Krell KAV-300I Integrated Amplifier features Krell’s robust power supply architecture, discrete circuitry, and minimalist signal path, resulting in tight bass, transparent midrange, and extended, controlled high frequencies.
• Specifications – Rated at approximately 150 W per channel into 8 ohms and 300 W into 4 ohms, with high-current output stages, wide frequency response, and stable operation into low-impedance speaker loads.
• Dimensions – Measures approximately 432 mm (W) × 178 mm (H) × 457 mm (D), requiring a sturdy, well-ventilated rack to accommodate its substantial chassis depth and heat dissipation.
• Weight – Weighs roughly 31 kg, reflecting its oversized transformer, large capacitor bank, and heavy aluminum chassis designed for mechanical stability and long-term electrical performance.
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SOULNOTE A-3 Reference Integrated Amplifier
• Overview – SOULNOTE A-3 Reference Integrated Amplifier, released in 2021, is a solid-state Class AB integrated design without DAC or phono, engineered for ultimate signal purity and unrestricted current delivery.
• Circuit Philosophy – Built around SoulNote’s zero-feedback, non-parallel architecture, the amplifier prioritises instantaneous current response, wide bandwidth, and natural harmonic flow, appealing strongly to purist audiophiles.
• Sonic Character – SOULNOTE A-3 Reference Integrated Amplifier delivers exceptional dynamic contrast, dense tonal colour, and expansive soundstage depth, excelling with difficult loudspeaker loads and revealing high-resolution source components.
• Specifications – Rated at approximately 120 W per channel into 8 ohms and 240 W into 4 ohms, with ultra-high current capability, wide frequency response, and discrete output devices optimised for low impedance control.
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Krell KSA200S Amplifier
• Product Overview – The Krell KSA200S Amplifier, released in 1995, is a solid-state pure Class A stereo power amplifier delivering legendary current capability, extreme control, and the authoritative sonic signature Krell is known for.
• Amplification Topology – Designed with massive power supplies and fully balanced circuitry, the KSA200S operates in continuous Class A, providing unwavering drive, low distortion, and exceptional loudspeaker control even under demanding loads.
• Sonic Performance – Krell KSA200S Amplifier delivers explosive dynamics, deep controlled bass, and a neutral tonal balance, excelling with difficult speakers and large-scale orchestral or rock recordings at realistic listening levels.
• Specifications – Rated at 200 watts per channel into 8 ohms, doubling into 4 ohms, with stable operation into 2 ohms, ultra-high current output, and extremely low output impedance for maximum damping factor.
• Dimensions – Chassis measures approximately 438 mm (W) × 197 mm (H) × 546 mm (D), reflecting the substantial heatsinking and transformer size required for sustained Class A operation.
• Weight – Weighs approximately 72 kg, with the extreme mass attributed to oversized transformers, extensive heatsinks, and heavy internal construction designed for thermal stability and long-term reliability.
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Naim NAC 332 Preamplifier
• Product Overview – The Naim NAC 332 Preamplifier, released as part of Naim’s 300 Series New Classic range, is a high-resolution analogue preamp with discrete Class A input stages and advanced volume control for superb musical clarity.
• Design & Connectivity – Featuring balanced XLR, RCA, DIN inputs, configurable input buttons, and headphone output, the NAC 332 offers effortless system integration and flexible routing with premium control and responsiveness.
• Sound Character – The NAC 332 delivers natural dynamics, engaging rhythm, and refined tonal balance, preserving micro-details and broad soundstage depth that unlock the full potential of connected power amplifiers.
• Specifications – Nominal frequency response extends beyond 3Hz-40kHz, distortion as low as 0.003% (1kHz), low noise floor, precision fixed-resistor volume control and bi-directional ZigBee remote control.
• Dimensions – Approximately 432 mm (W) × 91.5 mm (H) × 317.5 mm (D), with sleek anodised aluminium chassis engineered for rigidity, vibration suppression, and elegant integration into a reference system.
• Weight – Weighs roughly 11 kg (24.25 lbs), reflecting its robust construction, quality components, and substantial internal power supply for stable performance and long-term durability.
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Aavik I-880 Integrated Amplifier
• Overview – Aavik I-880 Integrated Amplifier, released in 2021, is a high-power solid-state Class D integrated amplifier featuring advanced DAC and phono capabilities, engineered for extreme resolution and low-noise performance.
• Sound Performance – Designed for absolute transparency, the amplifier delivers explosive dynamics, ultra-low noise floor, and exceptional control, presenting music with speed, scale, and natural tonal balance across complex passages.
• Design Philosophy – Built using Aavik’s resonance-control technologies and minimalist signal paths, the Aavik I-880 Integrated Amplifier emphasizes mechanical grounding and vibration reduction to preserve microdetail and spatial accuracy.
• Specifications – Rated at approximately 300 watts per channel into 8 ohms and 600 watts into 4 ohms, offering extremely high damping factor, wide bandwidth, and stable operation with demanding loudspeaker loads.
• Dimensions – Chassis measures approximately 442 mm (W) × 147 mm (H) × 460 mm (D), providing a substantial yet refined footprint suitable for high-end audio racks.
• Weight – The amplifier weighs approximately 42 kg, reflecting its massive power supply, resonance-controlled enclosure, and premium internal construction for thermal stability and sonic consistency.
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Naim NAP 350 Monoblock
• Product Overview – Naim NAP 350 Monoblock Power Amplifiers, released in 2023, are solid-state Class D reference monoblocks using Naim’s Statement-derived technology, delivering immense power, speed, and control for flagship loudspeaker systems.
• Advanced Amplification Design – Each monoblock employs Naim’s proprietary Class D topology with ultra-fast switching, low noise floor, and optimised grounding, ensuring exceptional timing accuracy, dynamic headroom, and musical coherence.
• Sound Performance – The Naim NAP 350 Monoblock Power Amplifiers provide explosive dynamics, iron-fisted bass control, and expansive soundstage scale, while preserving Naim’s trademark rhythmic drive and natural tonal balance.
• Specifications – Rated at 175 W into 8 ohms and 345 W into 4 ohms per monoblock, stable into low-impedance loads, with wide bandwidth response and advanced thermal management for sustained high-level performance.
• Dimensions – Each chassis measures approximately 432 mm (W) × 91 mm (H) × 317 mm (D), matching Naim’s New Classic series proportions for seamless integration within reference-level Naim systems.
• Weight – Each monoblock weighs approximately 14.4 kg, reflecting substantial internal power regulation, mechanical isolation, and rigid enclosure construction essential for electrical stability and vibration control.
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Jadis I-50 Tube Integrated Amplifier
• Product Overview – Jadis I-50 Tube Integrated Amplifier released in 2018, is a pure Class A, vacuum-tube integrated amplifier featuring line-level and optional phono capability, delivering classic French tube musicality with modern reliability.
• Circuit & Build Quality – Handcrafted in France, the amplifier employs point-to-point wiring, oversized transformers, and premium passive components, ensuring low noise, long-term stability, and the unmistakable Jadis tonal richness.
• Sound Performance –Jadis I-50 Tube Integrated Amplifier is known for its lush midrange, fluid dynamics, and expansive soundstage, the Jadis I-50 Tube Integrated Amplifier excels with vocals and acoustic music while maintaining control and drive with efficient loudspeakers.
• Specifications – Delivers approximately 50 W per channel in pure Class A using KT150 output tubes, with 4 and 8 ohm taps, wide bandwidth response, and robust power supply for consistent tube operation.
• Dimensions – Approximate chassis dimensions are 485 mm (W) × 245 mm (H) × 380 mm (D), housed in a polished stainless-steel frame that combines mechanical rigidity with distinctive visual presence.
• Weight – Weighs approximately 35 kg, reflecting massive transformers, heavy-gauge chassis construction, and substantial tube complement essential for Class A thermal and electrical stability.
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Mark Levinson No.53 Reference Monoblock
• Product Overview – Mark Levinson No.53 Reference Monoblock, released in 2009, is a solid-state Class D reference amplifier using proprietary PWM switching architecture, delivering extreme power, efficiency, and absolute control over demanding loudspeakers.
• Reference Engineering – Designed as a no-compromise statement, the amplifier employs separate digital control, analog audio, and power sections, ensuring ultra-low noise, massive current delivery, and exceptional stability under real-world loads.
• Sound Performance – Renowned for its effortless dynamics, expansive soundstage, and iron-fisted bass control, the Mark Levinson No.53 Reference Monoblock combines transparency with authority rarely achieved in high-power amplification.
• Specifications – Rated at 500 W into 8 ohms, 1000 W into 4 ohms, with stable operation into 2 ohms, ultra-wide bandwidth, low distortion, and advanced thermal and protection monitoring systems.
• Dimensions – Each chassis measures approximately 483 mm (W) × 241 mm (H) × 610 mm (D), featuring substantial heatsinking and an industrial-grade enclosure engineered for long-term reference operation.
• Weight – Each monoblock weighs approximately 61 kg, reflecting its massive power supply, high-density construction, and mechanical rigidity essential for vibration control and electrical stability.
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SoulNote A-1 Ver. 2 Integrated Amplifier
• Product Overview – SoulNote A-1 Ver. 2 Integrated Amplifier, released in 2022, is a solid-state Class AB integrated amplifier using Soulnote’s zero-feedback philosophy, delivering exceptional speed, transparency, and natural musical flow.
• Circuit Architecture – Designed with fully discrete, non-NFB circuitry and simplified signal paths, the amplifier prioritises phase accuracy, micro-dynamic resolution, and tonal purity, appealing to listeners seeking uncoloured, high-resolution playback.
• Sound Performance – The SoulNote A-1 Ver. 2 Integrated Amplifier offers agile bass control, vivid midrange articulation, and extended treble clarity, pairing effortlessly with revealing loudspeakers and high-quality digital or analog sources.
• Specifications – Output power is approximately 80 W per channel into 8 ohms and 160 W into 4 ohms, featuring wide bandwidth, high current delivery, and a robust linear power supply.
• Dimensions – Approximate chassis dimensions are 454 mm (W) × 179 mm (H) × 407 mm (D), housed in a resonance-controlled aluminium enclosure optimised for electrical stability and thermal management.
• Weight – The unit weighs approximately 24 kg, reflecting its substantial transformer, high-capacity power supply components, and rigid mechanical construction designed to minimise vibration and noise.
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Classe CP50 Preamp and CA150 Power Amplifier
• Reference Heritage – Classe CP50 Preamp and CA150 Power Amplifier, released in the late 1990s, combine solid state Class A/AB design with refined Canadian engineering, delivering authoritative control, tonal neutrality, and long-term musical satisfaction.
• Preamplifier Performance – The CP50 preamplifier is renowned for its low-noise architecture, discrete circuitry, and transparent gain stages, offering excellent channel separation and a natural, unforced presentation across analog sources.
• Power Amplifier Authority – The CA150 stereo power amplifier provides high-current solid state Class AB operation, maintaining composure into difficult speaker loads while preserving midrange clarity, dynamic headroom, and tight, controlled bass response.
• Specifications – Power output is rated at approximately 150 watts per channel into 8 ohms, doubling into 4 ohms, with wide bandwidth, high damping factor, and stable operation into demanding loudspeakers.
• Dimensions – Classe CP50 Preamp and CA150 Power Amplifier. CP50 measures approximately 483 mm (W) × 76 mm (H) × 330 mm (D), while CA150 measures roughly 483 mm (W) × 178 mm (H) × 406 mm (D), suitable for standard hi-fi racks.
• Weight – CP50 weighs about 8 kg, while the CA150 weighs approximately 29 kg, reflecting substantial power supply design, heavy transformers, and rigid chassis construction for vibration control and thermal stability.
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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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BAT Rex2 Amplifier
Compelling 6-Bullet Sales-Focused Description – BAT Rex2 Amplifier
• Overview – BAT Rex2 Amplifier, released in 2010, is a Class A tube amplifier featuring fully balanced circuitry, high-current output.
• Circuit Design – Built on Balanced Audio Technology’s zero-global-feedback, fully balanced topology, the design prioritizes signal purity, low noise, and exceptional channel separation across complex musical material.
• Sonic Character – BAT Rex2 Amplifier delivers commanding bass authority, expansive soundstage depth, and lifelike dynamic swings, maintaining composure with difficult speaker loads and high listening levels.
• Specifications – Rated at approximately 250 watts per channel into 8 ohms and 500 watts into 4 ohms, using MOSFET outputs, dual-mono power supplies, balanced inputs, and optional internal DAC or phono modules.
• Dimensions – Approximately 444 mm (W) × 235 mm (H) × 508 mm (D), housed in a resonance-controlled chassis engineered for thermal stability and long-term high-power operation.
• Weight – Approximately 49 kg, reflecting massive transformers, extensive power storage, and heavy-duty internal construction essential for sustained high-current performance.
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Krell FPB MC250 Monoblock
• Overview – Krell FPB MC250 Monoblock, released in 2001, is a solid-state Class A/AB monaural power amplifier designed to deliver immense current capability, extreme control, and reference-level dynamics for demanding loudspeakers.
• Amplifier Topology – Built on Krell’s Full Power Balanced architecture, it operates in high-bias Class A before transitioning to Class AB, ensuring low distortion, fast transient response, and consistent performance across complex loads.
• System Authority – The Krell FPB MC250 Monoblock excels at driving low-impedance and difficult speakers, producing authoritative bass grip, wide dynamic headroom, and effortless scale without compression at realistic listening levels.
• Specifications – Rated at 250 watts into 8 ohms, doubling to 500 watts into 4 ohms and higher into lower impedances, featuring extremely high damping factor, wide bandwidth, and fully balanced discrete circuitry.
• Dimensions – Approx. 438 mm (W) × 305 mm (H) × 533 mm (D), housed in a massive aluminium chassis with extensive heatsinking and internal isolation for thermal stability and vibration control.
• Weight – Approximately 68 kg per monoblock, reflecting enormous transformers, capacitor banks, and Krell’s uncompromising mechanical construction required for sustained high-current operation.
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Naim NAC-N272
• Overview – Naim NAC-N272, released in 2015, is a network streaming preamplifier that combines a high-quality preamp, DAC, and streamer in one, offering broad format support and classic Naim analogue refinement.
• Streaming & Connectivity – Built-in UPnP streaming, Spotify Connect, TIDAL, Bluetooth (aptX), USB, and multiroom compatibility give versatile access to digital sources while maintaining superior signal integrity.
• Analogue Strength – The analogue volume control and preamp section reflect Naim’s heritage, delivering musical fluidity and coherence whether feeding power amps directly or paired with external DACs and sources.
• Specifications – Supports 24-bit/192 kHz and DSD64 streaming, balanced DIN and RCA inputs, six digital inputs, Class A headphone output, variable/fixed outputs, and optional power supply upgrades for enhanced performance.
• Dimensions – Naim NAC-N272 is approx. 432 mm (W) × 87 mm (H) × 314 mm (D), designed in Naim’s classic aluminium chassis for robust build quality and easy rack integration.
• Weight – Roughly 12.5 kg, reflecting solid internal construction, quality power supply, and mechanical damping typical of Salisbury-built Naim components.
• Product Review – https://www.whathifi.com/naim/nac-n-272/review
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Luxman M-900u Ultimate
• Overview – Luxman M-900u Ultimate, released in 2013, is a solid-state Class AB stereo power amplifier engineered for extreme current delivery, tonal neutrality, and absolute control over demanding loudspeaker loads.
• Amplifier Architecture – Designed with Luxman’s ODNF 4.0 feedback circuitry, it delivers exceptional speed, ultra-low distortion, and natural musical flow while preserving dynamic contrast and micro-detail across complex recordings.
• System Authority – Luxman M-900u Ultimate excels in large-scale systems, providing effortless drive, deep bass grip, and expansive soundstaging, making it ideal for reference loudspeakers with challenging impedance characteristics.
• Specifications – Rated at 300 watts per channel into 8 ohms and 600 watts into 4 ohms, featuring high damping factor, wide bandwidth response, and fully discrete circuitry for uncompromised signal integrity.
• Dimensions – Approx. 467 mm (W) × 226 mm (H) × 485 mm (D), housed in a substantial chassis with thick aluminium panels and optimized internal layout for thermal stability and vibration control.
• Weight – Approximately 48 kg, reflecting massive transformers, large capacitor banks, and Luxman’s uncompromising mechanical construction required for sustained high-power performance.
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FM Acoustics 245 Pre Amp and F10B Power Amp
• Overview – FM Acoustics 245 Pre Amp and F10B Power Amp, released circa 1995, form a reference-grade solid-state amplification system focused on extreme linearity, ultra-low noise, and uncompromising signal purity.
• Preamplifier Design – The FM Acoustics 245 preamplifier is engineered for absolute transparency, offering exceptional channel separation, precision volume control, and vanishingly low distortion for the most revealing analog and digital sources.
• Power Amplification – Designed for stability and control, the pairing delivers effortless dynamics, tight bass authority, and a neutral tonal balance, allowing loudspeakers to perform without coloration or compression at any listening level.
• Specifications – F10B delivers approximately 250 watts per channel into 8 ohms, doubling into lower impedances, with extremely low THD, wide bandwidth, high damping factor, and fully discrete, DC-coupled circuit topology.
• Dimensions – FM Acoustics 245 Pre Amp and F10B Power Amp: Preamp approx. 445 mm (W) × 140 mm (H) × 430 mm (D); power amplifier approx. 445 mm (W) × 260 mm (H) × 520 mm (D), designed for professional-grade rack integration.
• Weight – Preamp approximately 20 kg; power amplifier approximately 75 kg, reflecting massive power supplies, extensive shielding, and precision-machined chassis construction essential to FM Acoustics’ reference performance standards.
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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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Airtight ATM4 Tube Amplifier
• Product Overview – Airtight ATM4 Tube Amplifier, released in 1998, is a solidly engineered Class AB push-pull tube power amplifier using EL34 output valves, renowned for musical coherence, tonal purity, and long-term reliability.
• Circuit Topology – Hand-wired point-to-point construction with high-quality output transformers and conservative operating parameters ensures low distortion, excellent bandwidth, and stable performance across a wide range of loudspeaker loads.
• Sonic Performance – Airtight ATM4 Tube Amplifier delivers a harmonically rich midrange, controlled bass authority, and smooth extended treble, excelling in realism, spatial depth, and long, fatigue-free listening sessions.
• Specifications – Stereo power output approximately 36 watts per channel into 8 ohms, EL34 output tubes, 4/8 ohm taps, wide bandwidth response, and high-quality valve rectification supporting dynamic musical transients.
• Dimensions – Approx. 360 mm (W) × 220 mm (H) × 310 mm (D), featuring a compact yet robust chassis layout optimized for heat dissipation and mechanical stability.
• Weight – Approximately 21 kg, reflecting heavy-duty transformers, thick chassis materials, and conservative mechanical design essential for stable tube operation and long-term sonic consistency.
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MBL N15 Monoblock
• Product Overview – MBL N15 Monoblock, released in 2019, is a solid-state Class AB monaural power amplifier delivering high-current authority, extreme stability, and effortless control for reference-grade loudspeaker systems.
• Amplification Architecture – Fully balanced signal topology with oversized power supplies ensures low noise, exceptional channel separation, and unwavering performance under demanding loads, reflecting MBL’s Noble Line engineering philosophy.
• Sonic Performance – MBL N15 Monoblock delivers immense dynamic headroom, deep bass grip, and expansive soundstage reproduction, maintaining tonal neutrality and composure even at high listening levels.
• Specifications – Rated at approximately 200 W into 8 ohms and 400 W into 4 ohms, with high-current output stages optimized for difficult speaker impedances and wide bandwidth signal handling.
• Dimensions – Each chassis measures approximately 480 mm (W) × 170 mm (H) × 480 mm (D), designed to integrate seamlessly into high-end audio racks while supporting robust internal power architecture.
• Weight – Each monoblock weighs approximately 33 kg, reflecting heavy-duty transformers, extensive heatsinking, and rigid construction essential for long-term thermal stability and sonic consistency.
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Quad 303 Power Amplifier and Quad 33 Preamplifier
Iconic Stereo Amplifier System – The Quad 303 and Quad 33 form a legendary solid-state power amplifier and control unit pairing. The Quad 303 is a classic, reliable power amplifier designed to deliver the famous Quad sound with authority and precision.
The Renowned “Quad Sound” – Experience the unique, fatigue-free musicality that made this system famous. Characterized by its exceptional clarity, natural tonal balance, and effortless delivery, it provides a listening experience that is both engaging and timeless.
Fully Serviced and Authentic – This matched pair has been professionally serviced to original factory specifications, ensuring optimal performance and reliability. You receive the authentic, iconic experience as intended by Quad’s pioneering engineers.
Versatile Control Unit – The Quad 33 preamplifier features comprehensive inputs, including a high-quality moving magnet phono stage for your turntable. Its flexible filtering and tone controls allow you to tailor the sound perfectly to your room and taste.
Classic Compact Dimensions – The Quad 303 power amplifier measures a compact 267mm wide, 133mm high, and 206mm deep. The matching Quad 33 control unit shares a similar elegant, minimalist footprint designed for a refined hi-fi rack setup.
Substantial Build Quality – The robustly built Quad 303 amplifier weighs 8.2 kg (18.1 lbs), reflecting its high-quality internal components and chassis. The Quad 33 control unit adds a further 3.4 kg (7.5 lbs), denoting its solid construction.
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