HIFI 300B Pushes 845 Single Ended Class A Tube Amplifier HI-END Split Amplifier 24WX2 8Ohm 110V/220V

Specification parameters

Overall dimensions: width 43cm, height 36cm (including foot pad), depth 42cm (including wiring terminal)

Dimensions of the main unit of the amplifier: width 43cm, height 25cm (including foot pads), depth 42cm (including terminal block)

High-voltage power supply dimensions: width 43cm, height 11cm (including foot pads), depth 40cm

Rated output power: 24W+24W (RMS 8Ω)

Harmonic distortion: 1% (1kHz)

Frequency response: 15Hz~30kHz (-1.5dB)

Input sensitivity: 180mV

Input impedance: 100KΩ

Output impedance: 0Ω, 4Ω, 8Ω, 16Ω

Signal-to-noise ratio: 92dB

Power consumption: 140W (main unit of the amplifier) 235W (high-voltage power supply)

Vacuum tubes: 12AX7*2/6SN7*2/300B*2/845*2/5U4G*1

Power supply voltage: ~220V±5% (50Hz)

Net weight: Total weight 54kg (main unit 34kg, high-voltage power supply 20kg)

PHONO (Phono amplifier) Specifications

Harmonic distortion: 0.08% (1kHz)

Frequency response: RIAA; bandwidth: 0.25dB from 20Hz to 20KHz

Input sensitivity: MM: 6mV, MC: 0.5mV

Input impedance: MC: approximately 100Ω; MM: approximately 50KΩ

Signal-to-noise ratio: MC: 78dB MM: 85dB

Gain: MM: 50dB, MC: 72dB

The MK9700 has made multiple enhancements to the traditional tube amplifier architecture, breaking through traditional limitations,

The MK9700 is a power amplification system designed to meet multi-band requirements. It is equipped with customized 300B and 845 vacuum tubes, as well as Russian 12AX7EH and 6SN7EH vacuum tubes. Together with the MK9700's unique independent "power plant" split-type standalone power base station, it forms a large tube amplifier consisting of five major power systems and three core components. The MK9700 incorporates multiple core architectural technologies and top-tier components, including a high-voltage/low-voltage filament separation power supply system, an energy reserve transformer system, energy reserve matrix capacitors, pure power CLC filtering, 8-channel independent voltage regulation, Hi-End-level output transformers, American MIT and German MUNDORF series capacitors, and various built-in protection circuits and power-on timing. It is fully compatible with multiple audio sources and supports a wide range of interfaces

Dual-mode music switching, Power Amplifier/integration amplifier dual mode, RCA Class A Amplifier

Purple copper RCA female socket, nickel-plated carbon fiber terminal studs, ceramic tube socket, automotive paint baking... MK9700 is equipped with multiple technical systems, innovating and upgrading transistor control capabilities, successfully breaking through the limitations of traditional tube amplifiers.

MK9700 split vacuum tube power amplifier

The MK9700 extends the advantages of electronic tube power amplification in the vocal frequency range to the full frequency range, retaining the characteristics of electronic tubes while incorporating the control power of transistors. This allows for precise and emotional reproduction of various styles of sound across the full frequency range. Equipped with Hi-End technology and acoustic heart-level components, the MK9700 is a power amplification system that meets the listening needs of multiple frequency ranges.

Directly heated triode

300B: gentle and soft, 845: domineering

The MK9700 is equipped with a combination of 300B and 845 electronic tubes, which combines high linear amplification and strong power output characteristics, producing a rich and smooth tone with robust dynamics. Coupled with the MK9700's unique independent "power plant" split-type high-voltage power supply system, the low/high voltage separation provides strong energy support and high linearity for pure reproduction.

Strong control. Beyond transistor power amplifier

The majestic momentum compensates for the low-frequency deficiency of electronic tube power amplifiers

The MK9700 utilizes technological innovation to achieve a powerful blend of strength and delicacy. It adopts a split power supply design, featuring three power transformers and 14 capacitor matrices. Its reserve power far exceeds that of ordinary tube amplifiers, and its transient response is as fast as that of solid-state amplifiers, addressing energy shortcomings. The low-leakage transformer overcomes low-frequency looseness, and high-linearity amplification balances distortion and speed. Ultimately, the MK9700 achieves the fusion of the sound characteristics of tube amplifiers and the control capabilities of solid-state amplifiers. Whether it's challenging the overwhelming scenes of large-scale symphonies or mastering the complex rhythms of electronic music, it enables the speakers to vividly display their performance, refreshing the concept of the driving limit of electronic tube amplifiers.

Independent power plant split power source base station

Develop five major power systems

The split power supply base station serves as the energy hub of the MK9700. The MK9700 is equipped with three power transformers for overall power supply: two toroidal transformers provide high-voltage power to the electron tubes, and a separate high-power EI transformer supplies low-voltage filament power to the electron tubes. These components, coupled with a large-capacity matrix capacitor, store energy and filter signals for the entire system. The split high-voltage power supply offers three distinct advantages: ample reserve power, swift dynamic response, and pure, uncontaminated power through separate high and low voltage supplies,

Let the heavenly combination of 300B driving 845 fully unleash its potential, addressing the issue of insufficient dynamic range in traditional tube amplifiers. Whether it's delicate human voices or explosive symphony music, it can handle it all with ease, meeting the transient response requirements of the entire system.

Dual-channel isolated power supply architecture

Enhanced power supply standard for tube amplifier

The MK9700 utilizes a split-type independent high-voltage power supply base station for its high-voltage power supply, which is physically isolated from the low-voltage (filament) power supply of the main unit, thus avoiding high-voltage ripple crosstalk pollution. This design addresses the electromagnetic interference and component coupling issues inherent in traditional common-power modes. The separation of high-voltage power supply (anode high voltage) and low-voltage (filament) power supply (cathode heating) signifies a leap in power supply performance from traditional to Hi-End levels. It significantly enhances sound purity, dynamic performance, and equipment stability. The MK9700 redefines the paradigm of electronic tube power supply, elevating the power supply standard.

MK9700 five major power systems

Energy storage transformer system

High power, high rigidity, and wide frequency response inject powerful energy into the sound

The MK9700 power base station is equipped with two Class A iron core high-power toroidal transformers, wound with high temperature-resistant polyesterimide enameled wire, achieving a total peak power of over 1000W. The main unit is equipped with an EI type filament transformer, providing stable power supply with zero fluctuation, eliminating AC hum modulation. During playback, details are clear and distinguishable, with no noise in soft passages. Three power supplies, with high and low voltage separation, form a reserve power core engine, providing sufficient reserve power, precise energy release, and wideband clean transmission. This allows the 300B to drive the 845 sound system, delivering powerful dynamics and control, with a strong energy reserve power capable of handling various complex music scenarios.

MK9700 five major power systems

Pure power CLC filter system

Three-stage filtering refreshes the purity of the power supply, allowing every note to resonate in your ears

The MK9700 utilizes CLC filtering technology, akin to equipping sound with a purity filter. The golden combination of choke coil and capacitor matrix transforms mains electricity into pure current. Through multi-stage filtering and low internal resistance design, the CLC system not only provides pure power supply for electronic tubes but also brings out every detail of the sound. Whether you are a classical music enthusiast seeking supreme purity or a rock and symphony player loving dynamic impact, the MK9700's CLC filtering system for pure power supply allows you to hear previously unnoticed musical details.

Imported custom-made electronic tube

HiEnd coupling capacitor

HiEnd output transformer

Three core components craft MK9700 with Hi-End sound quality, whether it's the unique charm of tube amplifiers or Hi-End resolution and dynamics. Imported from Russia + customized tubes endow MK9700 with warm harmonics, Hi-End European and American coupling capacitors deliver precise details and style expression, and Japanese EI-type output transformers provide wideband drive, creating a Hi-End output large transformer.

Three core components of MK9700

Russian-made + customized electronic tube

The MK9700 is equipped with a 12AX7EH imported from Russia as an independent pre-amplifier circuit, and a customized 5U4G rectifier tube for electronic tube rectification, producing a bright and transparent sound. The MK9700 utilizes a Russian 6SN7EH vacuum tube for voltage amplification, followed by a customized 300B electronic tube driving an 845 electronic tube for pure Class A power amplification.

Both American MIT capacitors and German MUNDORF capacitors are heavyweight capacitor brands in the HiFi and Hi-end industries, holding an unshakable recognition status. MIT is known as the "dynamic scalpel", with high-frequency transparency akin to a laser and low-frequency power akin to thunder. MUNDORF is known as the "tone philosopher", with a warm mid-frequency and an expansive soundstage. MIT capacitors bring music closer to the precision of machinery, while MUNDORF capacitors make the machinery more in tune with the soul of music. Together, they form the yin and yang of the MK9700, achieving a balance between power and beauty.

Hi-end output transformer

Each MK9700 features one output transformer per channel, with a total of two wide-frequency response EI-type output transformers. These transformers are wound with high-temperature resistant 180-degree QZY polyesterimide enameled wire, enhancing low-frequency bounce and control, and enriching imaging capabilities. This allows the MK9700's power reserve, as well as the front-end advantages of electronic tubes and components, to be fully utilized, truly enabling the MK9700 to break through output bottlenecks.

Gentle and nourishing like a spring, dynamic and steadfast like a rock

Dynamic/soft dual tone, switching between two musical moods

Mode 1: Dynamic mode → Sound engine of energy burst

The sound exhibits high density and strong dynamics, with a powerful driving force. The ultra-low frequency energy surpasses that of a Solid-State Amplifier, and the dynamics are like a wild horse breaking free,

Mode 2: Soft mode → Delicate and nuanced

The sound is as relaxed as the warm afternoon sun, as delicate and soft as a fine brushwork sketch. It is pleasant to listen to and has a strong appeal. The details of the soft tones are as clear and distinguishable as whispers

The dynamic mode unleashes the power potential of the tube amplifier, while the soft mode returns to the soul of analog. Whether it's enjoying the delicacy of jazz music alone late at night or the shock of electronic music on weekends, the MK9700 covers all music style performance scenarios.

Dual-function large full-screen sound pressure meter

The monitoring work status is clear at a glance

Fixed bias voltage adjustment with precise adjustment

The MK9700 is equipped with a high-precision dual-function VU meter (audio level meter) for monitoring working status and BIAS voltage adjustment, making it easier and more intuitive to monitor the working status of electronic tubes and perform fixed BIAS voltage adjustment

Easily monitor and adjust the working state through external independent BIASADJ adjustment

The MK9700 header features a full-screen design, offering both a large-screen sensory experience and detailed interactivity

With the design featuring a black background and warm white backlighting, it exudes a sense of high-quality elegance without being flashy.

Power Amplifier/Integrated Amplifier dual mode

MK9700 can be used as a pure power amplifier, featuring dual modes that balance convenience and advanced functionality

Power Amplifier mode:

Directly connect to the standalone pre-amplifier through the Prein interface, and both the vacuum tube pre-amplifier and solid-state pre-amplifier can be connected

The 2000mV high-sensitivity input is compatible with 99% of the pre-amplification devices on the market

Merge mode:

Directly connect to audio source devices through dual lotus input, balanced input, and vinyl record player input, with a 420mV sensitivity input for plug-and-play.

Fully compatible interface design

Adapt to multiple audio sources

The MK9700 is equipped with three major interfaces: vinyl record player input, dual lotus, and balanced input

From analog audio sources to digital devices, from home audio systems to professional systems

The fully compatible design enables universal use of one device, allowing each music carrier to perform at a high level

Vinyl record player input:

The PHONO interface is specifically designed for vinyl record players to simulate audio sources and reproduce the warm and mellow quality of LPs. Its dedicated MM/MC input impedance is strictly set at 51kΩ

Adapt to the output characteristics of moving coil cartridges to avoid load distortion

Fully preserve the groove details and analog charm of vinyl record players

Double lotus input:

CD and AUX dual-RCA inputs, compatible with 99% of household audio sources

Supports common devices such as CD players, decoders, and streaming media players

With an input sensitivity of 420mV, there's no need for complicated setup; just plug it in and enjoy music

Fully balanced XLR input:

The balanced input interface adopts an XLR three-pin design

Transmit positive and negative differential signals, effectively filtering electromagnetic interference during transmission

Reliable process combining large signal pavilion and small signal PBC, integrating both rigidity and flexibility

The MK9700 utilizes a combination of large-signal and high-current soldering techniques with small-signal circuit boards, precisely designed for different signal characteristics. It strikes a balance between stability, anti-interference, and signal purity, ensuring long-term reliable operation and high-fidelity sound quality. Large-signal soldering involves the power amplification stage, power rectification and filtering, and other high-current paths, ensuring stable transmission of high current

Small signal PCB soldering: Small signal paths such as the pre-amplification, inverter circuit, and control module are implemented using PCBs, optimizing the paths to avoid electromagnetic interference from high-current lines to small signals.

Built in multiple protection circuits and startup timing

60 second startup delay protection:

Protective measures such as filament preheating, slow current loading, and output protection

Soft start protection function:

To avoid power on circuit impact during cold/hot conditions and protect the safety of electronic tubes and equipment

BMI power electronic tube protection function:

Real time monitoring of the working status of the 845 electronic tube, protecting the machine from damage to the power supply and output transformer in case of abnormal situations.