Product: HiFi Stereo Bluetooth 5.0 Vacuum Tube Amplifier MM Phono Amp for Turntables 320W
Brand: Douk Audio
Introduction 
 Douk Audio X1 tube power amplifier is the fully upgrading version in all aspects, using GE5654 vacuum tube to impove the sound quality, TDA7498E amp IC that can max output 160W+160W to drive all home speakers, integrating the function of phono preamp and amplifier to support MM phono turntables input, and adding a low frequency output that can connect active subwoofer to build 2.1 channel audio system.
 
 Mature Circuit & HiFi Components:
 Double PCB design, perfectly integrated the MM phono circuit. Reasonable and concise layout, less wiring and less noise.
 Adopting QCC3008 Bluetooth chip, with strong compatibility and supports APTX and APTX-LL lossless transmission. 
 NE5532 op amp responsible for pre-amplification and tone control, with excellent dynamic, rich details and wide sound field. 
 Customized whole aluminum alloy case with good heat dissipation, and use Simens capacitors, NEC relay, red loop inductance, pure copper gold-plated terminas etc.
 
 Parameters
 Audio input: Bluetooth 5.0 / stereo L/R RCA / MM Phono & Turntables
 Audio output: banana speaker jacks / Low frequency output (connect active subwoofer)
 Bluetooth chip: QCC3008 (support APTX / APTX-LL)
 Amp IC: TDA7498E
 Op amp: NE5532
 Max output power: 160W+160W(4Ω load)
 Speaker impedance: 4-8Ω
 Frequency response: 20Hz-20KHz(±3dB)
 SNR: >90dB
 THD: 0.5%
 Input sensitivity: 0.775V
 Treble and Bass range: ±6dB
 Working voltage: DC 19V-35V
 Dimensions(W*D*H): 115*166*60mm / 4.53*6.54*2.36in
 Package dimensions(W*D*H): 320*280*80mm / 12.60*11.02*3.15in
 Net weight: 782g / 1.72lb
 Package weight: 1400g / 3.09lb
 
 Packing List
 1*X1 Amplifier
 2*GE 5654 Vacuum Tube
 1*32V/5A Power Supply
 1*Bluetooth Antenna
 1*User Manual 

Bluetooth 5.0 & Stereo RCA & MM Phono inputs: can be used as tube amp or MM phono amp, and input signal can be losslessly switched via input selection, perfectly compatible with most audio device such as phone, computer, TV, CD player, DAC, MM record player and so on.
GE5654 vacuum tube & HiFi Sound: filter out the digital sound of common audio sources to get warm and sweet, delicate and mellow sound, much softer and more listenable, full in mid, powerful in low and clear in high frequency. No need to change or upgrade other vacuum tubes.
Super large output power & low frequency output: adopting TDA7498E amp IC whose max output power can reach 160W+160W(4Ω), and equipped with 32V/5A power supply, easily to drive most home passive speakers. And adding subwoofer output, convenient to connect active subwoofer and build 2.1 audio system.
Perfect Design & Powerful function: with tone control, easy to get more smooth and delicate sound by adjusting treble and bass knob, and bypass function is added to enjoy original sound. Vacuum tube circuit can be also bypassed, easy to compare the difference digital sound and tube sound, adding much fun and higher playability.
Exquisite Appearance & Proper Size: metal black case and vacuum tube with blue and orange decorating light looks fashionable and attractive, designed input switch / tube and tone pass & bypass switch, very convenient to use and suitable for stereo home and desktop audio system.

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