UOTANG MK9200 HiFi Preamplifier High-End Audiophile Pure Class A Fully Balanced Preamp for Home Use

Features:
UOTANG Preamplifier, Brilliant Sound Into Ears
* Magnificent power, boundless transparency
* A Hi-end preamplifier ideal for audiophiles with all functions included

UOTANG Hi-end Fully Balanced Class A Preamplifier MK9200
* Pure Preamplifier
* Independent Fully Balanced System
* Independent Single-Ended System
* 4 Groups of Class A Amplification with Full Balance
* Full Symmetrical Rhombus Differential Circuit
* Pure DC Circuit Preamplifier
* DC Voltage Stabilizing and Filtering Power Supply System
* Treble & Bass Adjustable, Bypass Mode Available
* Balance Adjustment, Left & Right Channel Balance Control
* Pure Class A Fully Balanced Preamplifier
* 80W Large Transformer, Precisely Made with Imported Grade A Silicon Steel Core
* High-Speed Rectifier Diodes, 12 Pieces in 3 Groups
* Electronic Filter Circuit, Dual Filtering
* Full Aluminum Dual-Control Remote Controller, Input & Volume Control
* Intelligent Control System, CPU Central Processing Chip
* 6 Pieces of Japan Special Imported Audio Capacitors for ELNA

Superior Energy Efficiency and Stable Performance
* Brand-new circuit design adopted
* Full balance is only the starting point of MK9200
* With premium energy efficiency configuration and elaborate circuit design, MK9200 serves as your ideal preamplifier
* Dual Independent System Pure Preamplifier: Independent Fully Balanced System/Independent Single-Ended System
* Equipped with a 4-group full balance system for dual channels, featuring independent symmetrical positive and negative bridge arm amplification
* It adopts imported Hi-end exclusive audio power transistors C4793/A1837 for medium-power amplification to implement full balance amplification, with the circuit frequency response covering 3HZ~150KHZ. The advanced and powerful independent single-ended amplification system delivers better consistency of output volume
* It carries UOTANG's full symmetrical high-speed rhombus pure DC amplification circuit
* Capacitor isolation between signal sources and power amplifiers is eliminated to form a pure DC amplification circuit
* Adjustable treble and bass allow you to manipulate subtle sound details as you wish
* Bypass output skips treble and bass adjustment to output original sound with authentic tone
* Balance adjustment enables left and right channel balancing according to the acoustic field environment requirements

Complete DC Voltage Stabilizing and Filtering Power Supply System
* Power Transformer: 80W imported Grade A toroidal core transformer with pure copper windings and epoxy encapsulation
* Rectifier Circuit: 12 rectifier diodes that convert alternating current to direct current via high-speed rectification
* Filter Circuit: 6 Japan Hi-End audio capacitors for ELNA for energy storage and signal filtering
* Voltage Regulating Circuit: Excellent absorption of power supply ripples to improve tonal purity. On the basis of the above four core power supply modules, the MK9200 adds a secondary electronic filter circuit composed of 6 Black Diamond capacitors and 2 Japanese audio transistors. It delivers transparent, crisp sound as clear as crystal mountain spring water.
* All signal paths of the MK9200 from input to output operate in pure Class A mode, delivering warm, smooth and rich tone that remains comfortable even during long listening sessions. It is built with a CPU central processing chip to handle overall arithmetic, control and coordination for the whole unit.
* MK9200 Inputs: 3 groups of fully balanced inputs/3 groups of RCA single-ended inputs
* MK9200 Outputs: 1 group of fully balanced output/1 group of RCA single-ended output

Premium Components
* Pure copper gold-plated terminals, solid alloy shock-absorbing foot pads
* 10 Japanese relays, Japan precision motor potentiometers for ALPS
* 5-color ring low-noise metal film resistors, Black Diamond capacitors, CBB capacitors for Philips 
* Fiberglass epoxy circuit boards, full aluminum alloy remote controllers and more
* Unified sensory matching appearance design across all UOTANG brand products
* MK9200 adheres to the core essence of preamplifiers, focusing on circuit design and energy efficiency configuration. MK9200 delivers outstanding audio performance and boundless transparent sound experience. Thus, it stands as an outstanding representative integrating technology and quality within UOTANG's full product lineup

Let Every Trace of Musical Note Carry Natural Highlight
* Fulfill your sonic expectations for a high-end preamplifier
* This high-end audiophile-grade MK9200 fully balanced preamplifier adopts the unified coordinated visual design of the UOTANG brand system for its appearance, featuring a black and gold color scheme that balances technological texture and premium quality. It also shares a matching design with the MK9600 pure power amplifier, inheriting UOTANG's design philosophy customized for home audio systems. The MK9200 is a fully balanced pure Class A DC amplification preamplifier.
* The entire MK9200 unit is developed centered on the core function and mission of a preamplifier. As many audiophiles know, preamplifiers shape sound while power amplifiers deliver output power. The core duty of a preamplifier is processing and amplifying weak signals. If this core task is not executed properly, any tiny flaw in the signal will be amplified again by the power amplifier, resulting in more noticeable audio distortion.
* Therefore, crafting the MK9200 preamplifier demands both a macroscopic design vision and meticulous fine-tuning capabilities. What constitutes the macro perspective and fine details? In our view, the MK9200’s circuit system and power supply system form the macroscopic framework, while a full set of coordinated subsystems and each individual performance execution point built upon this framework are the fine details.
* Take the MK9200’s circuit system as an example: we integrate three core circuit architectures—fully symmetrical amplification circuit, rhombus differential circuit and pure DC circuit—to develop a complete preamplifier equipped with both an independent fully balanced system and an independent single-ended system.
* For the MK9200’s power supply system, we combine four power coordination modules including power transformer, rectifier circuit, filter circuit and voltage stabilizing circuit to build a full DC voltage stabilizing and filtering power supply system.
* Whether you plan to upgrade your existing preamplifier or purchase your first preamplifier with one-stop premium performance, the MK9200 is fully competent for this role. Below we will introduce every detailed feature of the MK9200 preamplifier in depth.
* We will avoid obscure professional jargon as much as possible, adopting straightforward and plain language to help users fully understand the MK9200, without overusing descriptive audio adjectives to artificially guide subjective listening impressions.
* Modest yet capable, it relies on premium energy efficiency configuration and elaborate handcrafted circuits to meet the performance standards you expect from an ideal preamplifier.

Independent Fully Balanced System with Independent Single-Ended System
* Pure preamplifier with dual independent systems
* MK9200 Independent Fully Balanced System: Full balanced amplification delivers a wider soundstage than ordinary unbalanced circuits, creating the immersive listening experience of a concert hall or opera house. The positive, negative and ground lines of the left and right channels are fully separated and isolated, so the two channels operate independently without mutual interference. Each sound source can be distinguished clearly for superior stereo imaging. Each channel of the full balanced circuit uses nearly twice the components of standard unbalanced designs, granting higher resolution and richer audio details.
* MK9200 Independent Single-Ended System: The independent single-ended amplification paired with pure Class A circuit design features excellent transient response. It counteracts odd-order harmonic distortion while enriching even-order harmonics, endowing the MK9200 with warm, soft and rich tone that remains comfortable for extended listening sessions.

Top-Tier Masterpiece
* Dual independent operating systems: dedicated fully balanced circuit and dedicated pure single-ended circuit
* Rhombus differential circuits and fully symmetrical amplification deliver powerful performance and boundless transparent sound
* Complete DC voltage stabilizing and filtering power supply system that maximizes power efficiency
* Treble & bass adjustment, bypass mode and channel balance control let you freely tailor audio timbre as desired

The Ideal Fully Balanced Preamplifier for Audiophiles
* 4-group full balance system for dual channels
* Four sets of fully balanced and symmetrical amplification circuits implement independent positive and negative bridge arm amplification output for each channel. This achieves ultra-low CMRR (Common-Mode Rejection Ratio) and outstanding audio performance.
* Imported premium Hi-end audio medium-power transistors C4793/A1837 are adopted for full balanced amplification, lifting the MK9200's signal-to-noise ratio and slew rate. All four amplification circuits feature fully symmetrical discrete components with precise matching to eliminate subtle distortion.
* Full Balance: 2 amplification groups per channel, 4 amplification circuits across both channels
* Unbalanced: 1 amplification group per channel, 2 amplification circuits across both channels

Fully Independent Single-Ended Amplification System
* The fully independent single-ended amplification circuit system is completely separated from the fully balanced system. The two systems run independently without mutual interference, delivering more consistent output volume between balanced and single-ended modes with matched loudness. It eliminates cumbersome post-adjustments caused by volume shifts when switching between single-ended and balanced outputs.
* The dual independent systems operate with zero cross-interference. The left and right channels adopt full symmetrical discrete components with precise matching, bringing high output level, wide dynamic range and precise soundstage positioning.

Fully Symmetrical Rhombus Differential Circuit
Powerful Performance, Boundless Audio Transparency
* The tonal signature of UOTANG MK9200 pure preamplifier is determined by its circuit architecture. Premium components can fine-tune tonal details yet cannot alter the core sound character. UOTANG's symmetrical high-speed rhombus pure DC amplification circuit features full symmetry and no negative feedback capacitors to ground. It achieves high slew rate, wide frequency response, clean signal and low crossover distortion, delivering pure, natural, warm and transparent sound.
* Fully Symmetrical Amplification Circuit: The full signal chain — input, voltage amplification, driver stage and output — adopts complementary full symmetry. It maximizes the advantages of dedicated Hi-end audio transistors, enabling complementary strengths for improved circuit stability and output fidelity. The core challenge of fully symmetrical amplification circuits lies in ultra-strict component matching requirements. This unit uses fully discrete components with precise one-to-one pairing.
* MK9200 Rhombus Differential Circuit:  It combines two sets of PNP and NPN differential circuits to operate symmetrically via a four-transistor cross configuration. When receiving transient input signals, the MK9200 supports high output current to prevent waveform clipping from current saturation and boost slew rate, so it can sufficiently drive downstream power amplifiers. This circuit also suppresses transient intermodulation distortion, optimizes current driving performance, delivers superior analytical power and high fidelity, and noticeably upgrades both static and dynamic performance of the power amplifier.

Pure DC Circuit Preamplifier
* The pure DC circuit of MK9200 eliminates capacitive isolation between signal sources and power amplifiers to implement full pure DC amplification. It mitigates the negative impact of capacitors on frequency response range. No audio coupling capacitors exist within the audio channel, reducing signal distortion caused by capacitors. This design endows MK9200 with an expansive, powerful frequency response and a wide, open dynamic soundstage.

Pure Preamplifier with Treble & Bass Adjustment Functions
* The MK9200 features powerful treble/bass tuning and signal bypass functions. It adopts an independent tone control circuit equipped with Japan potentiometers for ALPS to deliver precise, fine-grained treble and bass adjustments. A dedicated bypass switch skips the entire tone control circuit to fully restore the authentic on-site sound of original recordings. The master volume knob also utilizes a motorized potentiometer for ALPS for subtle tuning, ensuring balanced output between left and right channels.
* A dedicated CPU central processing chip delivers precise signal management, lowering synchronization errors and boosting audio channel separation. It enables full customization of subtle audio details to match your preference.  This function can optimize unwanted reflected sound generated in rooms without professional acoustic treatment.
* Based on real listening environments, it rationally redistributes the energy of high, mid and low frequency bands.

Calibrate Your Exclusive Acoustic Space
Pure Preamplifier with Channel Balance Adjustment
* The MK9200 integrates a practical left-right channel balance adjustment function. Many listening rooms fail to achieve symmetrical acoustic conditions or symmetrical speaker placement on the left and right sides. When your listening position sits at the central axis, the left-right balance adjustment feature of MK9200 becomes essential. Based on your actual speaker layout, MK9200 helps you calibrate balanced left and right acoustic output for a more uniform overall soundstage. Tailored to real-world listening environments, it provides a secondary rational redistribution of audio energy for balanced left and right channel performance.

Full Set DC Voltage Stabilizing & Filtering Power Supply System
* The power supply system of MK9200 consists of one 80W power transformer, three groups of high-speed rectifier diodes and six 10,000μF ultra-large filter capacitors, forming a huge energy reservoir for stable electric current flow. It safeguards high-fidelity audio output starting from the power source, paired with high-performance voltage stabilizing circuits. This complete DC voltage stabilizing and filtering power supply system integrates four core circuit modules: power transformer, rectifier circuit, filter circuit and voltage stabilizing circuit.
* Power Transformer: Converts AC mains voltage into suitable alternating voltage.
* Rectifier Circuit: Transforms alternating voltage into pulsating DC voltage.
* Filter Circuit: Converts pulsating DC voltage into smooth DC voltage.
* Voltage Stabilizing Circuit: Minimizes interference from mains voltage fluctuations and load changes to maintain steady output voltage.

80W Imported Toroidal Core Transformer
* Custom toroidal transformer built with imported Grade A core, pure copper winding, epoxy resin encapsulation and shielding cover. Adopting imported Grade A toroidal core manufactured by grain-oriented winding plus heat treatment impregnation, it features low magnetic leakage, low temperature rise, minor power loss, high efficiency and low vibration noise. It delivers warm, delicate and steady audio performance with explosive dynamic response, which cannot be matched by ordinary transformers.

12 Rectifier Diodes
* Three groups of high-speed rectifier diodes with 4 pieces per group, 12 pieces in total.
* High-speed rectification rapidly supplies sufficient DC voltage to filter capacitors. The three groups of rectifier diodes act not only as the power source of MK9200, but also reduce voltage ripple for steadier, cleaner sound reproduction.

Purify & Filter, Deliver Pure Delicate Audio
Japan Matrix Reservoir-Grade Capacitors for ELNA
* Imported high-speed large capacitors dedicated to Hi-end audio equipment.
* 60,000μF matrix reservoir-grade capacitor array delivers superior filtering performance. 
* It supplies abundant power and professional filtering design for MK9200; low internal resistance accelerates filtering efficiency. High frequencies become more transparent with wide extension, low frequencies sound solid and powerful, delivering tremendous dynamic range.

Voltage Stabilizing Circuit
* Constant voltage source circuits secure stable operating voltage, keeping the whole unit running in optimal condition. It uses Zener diodes as voltage reference, FET constant current circuits and medium-power transistors for saturated output.
* Features high voltage regulation precision, fast response speed and excellent absorption of power supply ripples.
* The constant current source also sets proper static operating current for MK9200 rhombus differential amplification circuit, greatly enhancing common-mode negative feedback effect. It enables the circuit to suppress common-mode signals more effectively. The constant current source and differential amplification circuit work perfectly as a matched pair.

MK9200 Second-Layer Filter Circuit
* Based on the core DC voltage stabilizing and filtering power supply system, an elaborate secondary electronic filter circuit is equipped. This circuit consists of 6 Black Diamond KY capacitors and 2 Japanese audio transistors, serving as the second-stage filter of MK9200 and forming a dual-layer filtering architecture across multiple subsystems. It makes the sound of MK9200 transparent and crisp, as clear as crystal-clear mountain spring water.

Fully Balanced Pure Class A Amplification Preamplifier
* All signal paths of MK9200 from input to output operate under pure Class A mode. It eliminates switching distortion and crossover distortion, expanding the dynamic range.
This circuit cancels odd-order harmonic distortion while enriching even-order harmonics, delivering powerful resolving power and rich tonal smoothness. The MK9200 generates warm, soft and lush tone that remains comfortable even during extended listening sessions.

Beauty Lies in the Fusion of Art and Technology
* Modern tech aesthetics brought to life, adopting UOTANG brand signature black & gold color scheme.
* Brand-new design language equipped with tempered glass decorative panels and full aluminum alloy chassis.
* Full-aluminum IR Remote Control: Mechanical aesthetics with matte texture.

Pure Copper Gold-Plated Connector Terminals
* MK9200 Input: 3 sets of fully balanced inputs/3 sets of RCA single-ended inputs
* MK9200 Output: 1 set of fully balanced output/1 set of RCA single-ended outputs
* Exquisitely crafted terminals feature smooth rounded surfaces for tighter connection contact and more stable signal transmission.

More Details:
Intelligent Control System With Collaborative Computing Microprocessor Chip
* It serves as the core control system of the whole unit. A CPU central processing chip manages the arithmetic, control and coordination operations of all functional modules.

Japan Relays Independently Deployed for Each Audio Channel
* 10 relays form a protective barrier for audio input signals, with one relay assigned to each channel. This guarantees safe signal input and complete isolation between the left and right audio channels.

Fiberglass Epoxy Printed Circuit Board Boosts Resolution of Tiny Audio Signals
* It resists oxidation and reduces solder joint resistance, which effectively enhances the analytical performance for faint audio signals and preserves premium sound quality and signal fidelity.

Precision Motorized Potentiometer for ALPS Delivers Ultra-Precise Clock Frequency Signals
* This precision trim potentiometer imported from Japan optimizes matching consistency between the two channels, minimizes sonic distortion and maintains high signal fidelity. All audio adjustment functions support remote control operation.

Solid Pure Aluminum Alloy Feet
* High-grade vibration-isolation foot pads. These solid aluminum vibration-damping feet are precisely CNC machined, fitted with replaceable rubber sealing rings for superior vibration suppression.

Abundant Audiophile-Grade Electronic Components
* Reliable performance at every circuit node. It adopts 1/4W 5-band precision low-noise metal film resistors, paired with premium capacitors including capacitors for ELNA, Black Diamond capacitors and CBB film capacitors for Philips.

Full Aluminum Alloy Infrared Remote Controller with Heavy-duty exquisite matte texture
* All functions including signal input switching and volume adjustment can be operated remotely, delivering effortless and convenient user experience.

Full Aluminum Chassis for the Whole Unit
* Solid vibration suppression with premium raw materials. The MK9200 features an all-aluminum chassis with a 1cm thick front panel and a 0.5cm thick top cover, creating an extremely stable, weighty chassis structure.

UOTANG Preamplifier, Brilliant Sound Floods Your Ears
* Powerful comprehensive performance, boundless transparent audio
* It covers every premium trait audiophiles seek in an ideal preamplifier.

Rear Panel:
* 3 Groups of RCA Single-Ended Inputs
* 3 Groups of Fully Balanced Inputs
* 1 Group of RCA Single-Ended Outputs
* 1 Group of Fully Balanced Outputs
* Main Unit Power Input Port

Specifications:
* Overall Dimensions: Width 430mm x Depth 330mm x Height 108mm (excluding machine feet)
* Frequency Response: 20Hz~20kHz (+0/-0.1dB)/3Hz~150kHz (+0/-3dB)
* Full-Band Distortion: 0.002%
* Input Sensitivity: 250mV/40K (Balanced)|250mV/20K (RCA)
* Rated Input/Output Level: 2V (Audio Signal)/2V/50Ω (Audio Signal)
* Maximum Output Level: 12V (Audio Signal)
* Signal-to-Noise Ratio: 110dB
* Minimum Load Impedance: 600Ω
* Power Supply: AC 220V, 50/60Hz
* Net Weight: 7.5KG
* Recommended Matching Devices: MT909 Standalone Decoder, MT905 CD Player, MK9600 Pure Power Amplifier

Usage Notes:
1. The MK9200 must be paired with a power amplifier to drive speakers; it cannot connect to speakers directly.
2. When utilizing full balanced output, your downstream power amplifier must support balanced input.

Packing List:
* 1 x Set of Preamplifier

Packaging Details:
* Package weight: 9.2kg