MUZISHARE X20pro 2A3 Push 211 Hi-End Integrated Amplifier Power AMP Balanced

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A single-ended Class A vacuum tube amplifier featuring a 2A3 driving a 211 is indeed a hot topic within audiophile circles; This design retains the mellow tone of the 2A3 while achieving higher power output through the 211, making it particularly suitable for music lovers who pursue high fidelity and wide dynamic range. Tonal advantages: The direct-heated triode characteristics of the 2A3 bring a delicate and sweet sound, while the addition of the 211 provides a wider dynamic range and stronger driving force, resulting in an overall tone that combines mellowness and power.
Circuit Design:The amplifier employs a fully direct-heated triode architecture in a cascaded single-ended Class A configuration: 310 (Preamplifier) ​​→ 2A3 (Voltage Amplification) → Transformer (Coupling) → 211 (Power Output).
It boasts high linearity, low distortion, and a pristine tonal purity; the high-frequency extension is delicate and refined, imbued with a palpable sense of "air." The low frequencies exhibit impressive depth and elasticity—possessing distinct definition and "shape" without ever becoming boomy or overwhelming.

Product Features:
*The entire machine is handmade and uses a mortise and tenon joint welding method.
* Features wide-bandwidth EI-type output transformers, crafted using Z11 iron cores and a specialized winding technique to ensure high-fidelity audio reproduction.
* Equipped with an A-grade iron core toroidal power transformer boasting a substantial power capacity of 1750W.
* When operating in integrated amplifier mode, voltage amplification is handled by a 6SN7 tube utilizing a cathode-follower configuration. One output path feeds the power amplification stage, while a separate "pre-out" path is provided to facilitate easy integration with a subwoofer amplifier—effectively offering a dedicated preamplifier output function.
* Features a "Pure Power Amplifier" mode (bypassing the preamp section), which faithfully replicates the classic Western Electric WE91 circuit. This mode employs a 310A tube for voltage amplification, a 2A3 tube to drive the inter-stage transformer, and a 211 tube for the final power amplification output, offering output impedance options of 4Ω, 8Ω, and 16Ω.
* Connectivity includes two sets of RCA inputs, one dedicated "Pure Power Amplifier" input, one set of RCA pre-outputs, and one set of balanced (XLR) inputs.
* Features a specialized delayed filament power supply circuit for the 310A tubes, ensuring enhanced safety and longevity for the filaments.
* Offers selectable "Large Loop" and "Small Loop" feedback modes: the Large Loop (MAX mode) delivers a sound signature that is rich, smooth, and pure; the Small Loop (MIN mode) creates an expansive, vivid, and lively soundstage.
* Employs Sprague axial electrolytic capacitors for decoupling, while Mundorf M-Cap, Solen PB-MKP-FC, and custom-made "Meixing" audiophile-grade capacitors are utilized for coupling. Power supply filtering relies primarily on military-grade LSTL, Nichicon, and Sanyo electrolytic capacitors—working in conjunction with a choke coil—to provide ultra-low ripple and substantial energy reserves. Also features a specialized Permalloy-core balanced input transformer.
* Includes externally accessible potentiometers for adjusting the bias current of the power tubes, alongside a VU meter that can be toggled to display either the tube current or the output signal level.
* Equipped with a high-end, motorized ALPS potentiometer from Japan for volume control.
* Features a built-in power-on delay function for high-voltage activation and muting (approximately 30 seconds) to protect the circuitry and tubes.


Technical parameter：
Technical Specifications:
Rated Output Power: 20W + 20W
Harmonic Distortion: 1% (at 1 kHz)
Overall Frequency Response: 15 Hz – 35 kHz (-1.5 dB)
Signal-to-Noise Ratio (SNR): 90 dB
Left/Right Output Balance: 1 dB
Output Impedance: 4Ω, 8Ω, 16Ω
Input Impedance: 100 kΩ
Power Consumption: 330 W
Weight: 60 kg
Input Sensitivity: (Integrated Mode): 0.25 V (RCA); 0.28 V (BAL)
(Pure Power Amp Mode): 1.5 V
Vacuum Tubes Used: 6SN7 x 2, 310A x 2, 2A3 x 2, 211 x 2
Power Supply Voltage: ~115 V / 230 V ±5% (50 Hz)
Operating Conditions: Temperature: 0°C – 40°C; Humidity: 20% – 80%
Storage Conditions: Temperature: -20°C – 70°C; Humidity: 20% – 90%