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HiFi Bluetooth 5.0 Vacuum Tube Preamp Stereo Receiver Headphone Amp USB Player

Item description

Features
  • Multiple audio inputs: with Bluetooth/RCA/U-disk inputs, can be perfectly compatible with iPod, Phone, MP3, TV, CD players, laptop, desktop computer or other streaming media players etc., satisfy most requirements of common home audio system use.
  • Multiple functions:
Can be used as a tube preamp, can soft and warm the sound and greatly improve the sound quality when connected between audio source and amplifier or active speaker.
 
Can be used as a headphone amplifier, convenient to listen to lossless music alone or at night. The RCA and 3.5mm headphone jack can output at the same time to meet more needs.
 
Can be used as a digital player with U-disk inputs, supporting MP3 and other lossless format such as APE, FLAC, WAV, WMA. No need for any driver, plug and play, convenient to enjoy fun even on the road or outdoors.
  • HiFi clear sound with tone control and reasonable circuit layout: adopting vacuum tubes design to filter out the digital sounds of common sound sources, making the sound warm and sweet, full and mellow, much softer and more listenable. And using NE5532 op amp for tone control, treble and bass can be adjusted separately, easy to adjust more delicate sounds of different styles.
  • Proper size and exquisite appearance, black aluminum case make it more fashionable and powerful. With power/input mode indicators to clearly show the working status in real time, very suitable for home and desktop audio system use.
Warm tips:
 
1. A9 is a tube preamp which needs to work with amplifiers or active speakers, cannot drive passive speakers or used with turntables directly. And the previous / next song function is invalid in U-disk input mode.
 
2. The USB interface only supports U-disk, not support PC-USB. And the RCA and 3.5mm headphone jack can output at the same time.
Parameters
  • Audio input: Bluetooth / U-disk / Stereo RCA
  • Audio output: stereo RCA / 3.5mm headphone jack
  • Bluetooth version: 5.0
  • U-disk supported formats: MP3 / WMA / APE / FLAC / WAV etc.
  • U-disk max capacity: 32G
  • Frequency response: 20Hz-20KHz(±3dB)
  • SNR: ≥110dB (input RCA)
  • THD: 0.05%
  • Input sensitivity: 0.775V
  • Output level (RCA): 1.4Vrms
  • Treble & bass gain: ±6dB
  • Max headphone output power: 100mW(32Ω)
  • Matched headphone impedance: 16-300Ω
  • Dimensions(W*D*H): 140*130*31mm / 5.51*5.12*1.22in
  • Package dimensions(W*D*H): 320mm*220*80mm / 12.60*8.66*3.15in
  • Net weight: 420g / 0.93lb
  • Package weight: 700g / 1.54lb
Packing List
  • 1 x A9 Preamp
  • 2 x 6K4 Tube
  • 1 x 12V Power Adaptor
  • 1 x Bluetooth Antenna
Safe and secure payment by PayPal.
Please leave VALID TELEPHONE NUMBER which is necessary and very important.
 
Customs Clearance
We are NOT responsible for any customs duties fee.
We are NOT responsible for any import tax or customs delay.
 
Most item will be shipped within 2 working days. For package less than 2KG, we use Airmail (10-25 days to most countries) and for package over than 2KG we use Expedited Service such as DHL, UPS and FEDEX (5-8 days to most countries). 

Free Return Within 30 Days

We provide  return within 30 days for all items you bought on eBay, full refund and return shipping will be provided.

1-year warranty is provided for all items(Excluding: 1. Man-made damage or misuse. 2. Audio accessories and consumables such as vacuum tubes).

If you are satisfied with our products and service please leave a 5-star StarStarStarStarStar. Positive feedback rating Feedback is very important to us just like our lives, please DO contact us before you leave a neutral Neutral feedback rating or negative Negative feedback rating feedback, we will provide better solutions until you are satisfied.

 

 

 

Douk Audio / Nobsound Studio was founded in 2013 in Shenzhen CHINA, we own several brands including Douk Audio / Nobsound / Little Bear etc.
 
As a professional audio company, we are dedicated to design and produce the best products at the lowest prices to make HiFi affordable.
 
We will spare no efforts to bring great products and service for customers and extremely to improve our customers’ listening experience.
Please don't hesitate to contact us if you have any questions or comments about our items. And our working time is from Monday to Friday between 9:00 am to 06:00 pm(Beijing Time), which means we can keep on-line at:
 
 Working time

Beijing(CN)Monday-Friday09:00 AM - 18:00 AM
New York(US)
Sunday to Thursday08:00 PM - 05:00 AM
London(UK)Monday-Friday01:00 AM - 10:00 AM
Paris(FR)Monday-Friday02:00 AM - 11:00 AM
 
During holiday, please allow us to response you early next week. Please don't leave any negative / neutral feedback or make dispute/claim on our non-working time, thank you for your understanding and cooperation.
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