MUZISHARE X20Pro 2A3 Push 211 High-end tube Amplifier Class A Audiophile tube Amplifier

The entire unit is handcrafted using point-to-point welding. It employs a Z11 iron core and a wide-range E1 output transformer with a special winding process to ensure high-quality sound reproduction; it also features an A-grade iron core and a high-power 1750W toroidal power transformer. When operating in combined mode, voltage amplification is achieved through a 6SN7 amplifier, using a cathode output method. One output supplies power to the power amplifier, while the other serves as a preset preamp output for easy use with a subwoofer amplifier, effectively providing preamp output functionality.

For pure power amplifier functionality, a replica of the Western Electric WE91 circuit is used, employing a 310A tube for voltage amplification, which then drives a transformer via a 2A3 tube, resulting in power amplification output from a 211 tube. Output impedance is 40, 80, and 16Ω. It features two sets of RCA inputs: one pure power input and one preamp RCA output, as well as a balanced input. A specially designed 310A tube lamp is also included. The filament delay power supply method better ensures the safety of the 310A filament; it features a special large-loop and small-loop feedback working mode; the large loop (MAX mode) produces a rich and pure sound, while the small loop (MIN mode) produces an open and lively soundstage;

It uses Speyer axial electrolytic capacitors for decoupling, and Mondoff M-cap, Soren PB-MKP-FC, and Meishi custom audiophile capacitors for coupling; the power supply filtering mainly uses military-grade LSTL, Nichicon, and Sanyo electrolytic capacitors with choke coils to provide low ripple and a large reservoir of power reserves; it features a specially designed permalloy balanced input transformer; an external power tube current adjustment potentiometer with selectable current display and output level VU meter; it uses a high-end Japanese ALPS motor potentiometer; and it has a high-voltage delay and mute delay function (approximately 30 seconds) for power-on;

Technical Specifications:
Rated Output Power: 20W + 20W;
Harmonic Distortion: 1% (1kHz)
Frequency Response: 15Hz-35kHz (-1.5dB)
Signal-to-Noise Ratio: Approximately 90dB
Output Balance: 1dB
Output Impedance: 4Ω, 8Ω, 16Ω
Input Impedance: 100KΩ
Power Consumption: 330W
Weight: 50Kg
Input Sensitivity: (Integrated): 0.25V (RCA) 0.28V (BAL) (Pure Power Amplifier): 1.5V
Vacuum Tubes Used: 6SN7x2, 310Ax2, 2A3x2, 211x2
Overall Dimensions (WxDxH): 470x430x290 (mm)
Power Supply Voltage: ~115V/230V 5% (50Hz) Operating conditions: Temperature: 0°C~40°C; Humidity: 20%~80%; Storage conditions: Temperature: -20°C~70°C; Humidity: 20%~90%.