Sell FX-AUDIO TUBE-03 MKII 6K4 HiFi Vacuum Tube Preamp Bluetooth 5.0 Stereo Receiver Home Desktop Audio P best price

【Tube Headphone Amp】Adopts 6K4 vacuum tube design,can simulate natural sound,that is soft and delicate, dynamic and pleasing;And adopts BUF buffer headphone amp circuit,OP amp IC OPA1656IDR,can drive regular headphone and effectively reduce the distortion and noise of the headphone, increase the signal-to-noise ratio,improve the dynamic and sound quality of the sound system. 【Bass&Treble Control】Manually rotate the potentiometer knob on the front panel to adjust bass and treble volume, lowering the volume to the left and increasing the volume to the right. 【MCU Intelligent Control】Adopts MCU intelligent control and soft power on/off design,can switch input channel and reduce switching loss and noise, the effect is better than the automatic switch equipment. 【Professional-Level Components】Adopts advanced profession-level electronic components,such as 6K4 tube,IC QCC3008,decoder IC ESS9023,OP IC 0PA1656IDR and JRC4556 high current output chip,as well as relay, coupled audio capacitance;PCB board adopts black immersion gold craft and the equipment shell is made of metal oxidation wire drawing process,with stable signal, high temperature resistance, long service life and other characteristics. As BT Tube Headphone Amplifier: 3.5mm headphone amplifier interface is compatible with ordinary 3.5mm headset. Components uses JRC4556 high power output chip and buffer headphone amp circuit. Headphone Power Output: 30mW@16R, 50mW@32R, 70mW@68R, 70mW@150R. With DAC Function (ESS9023 DAC Chip): Built-in ESS9023 decoding chip, supports 24Bit sample rate, which integrates a 2Vrms output driver op amp, and has low power consumption. 6K4 Tubes: 6K4 tubes can be replaced by 6J1, 6J4, 6AK5,GW5654 tubes for different listening experience. OP amp 0PA1656IDR can also be replaced by AD827 or MUSE02. Low Noise Design: Power supply circuit is separated from other components. With shielded function, interference and noise will be minimized and sound quality will greatly improved. LED Indicator: The LED indicator in front panel show the input. Red LED for RCA input, and blue for BT input. Short press SELECT button can change the signal input. Signal switching uses relay switch which is better than analog power switch. Specification: Chipset: QCC3008+ESS9023+GE5654+OPA1656IDR +JRC4556 Frequency Response: (±3dB)20Hz-22KHz Input: BT 5.0, APTX, RCA Output: RCA, 3.5mm Headphone Amplifier SNR: 100dB THD: 0.001% Line Output Impedance: Up to 600R Headphone Output Impedance: 16-150R Line Input Impedance: 600R-20K Headphone Power Output: 30mW@16R, 50mW@32R, 70mW@68R, 70mW@150R Sensitivity: 0.775Vrms RCA RMS Level: 2Vrms Bass/Treble Gain: ±8dB Power Supply: 12V 1A Color: Black/Silver(optional) Unit Weight: 0.4kg Package Weight: 0.695kg Unit Size:3.85 x 5.82 x 1.3 in Package Size: 10.23 x 7.87 x 2.63 in Package List: 1 * Preamplifier 1 * Power Cable（US/EU/UK） 1 * Amplifier 2 * Bulb 1 * User Manual