HiFi Stereo Bluetooth 5.0 Preamplifier Vacuum Tube Preamp Mini USB DAC Adapter

Description

arious audio input: can be connect to PC directly as a high-grade USB external sound card, and can be wired to CD player, lossless audio source， and can wirelessly connect to smart phone by Bluetooth, very convenient.
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HiFi Stereo Bluetooth 5.0 Preamplifier Vacuum Tube Preamp Mini USB DAC Adapter
Item description
Notice:
1.The vacuum tube needs 5-7 seconds to warm up.
2.Choose audio input by hand. Clockwise rotation to switch different kinds of input signal, the order is Bluetooth→USB-PC→AUX
Features
Various audio input: can be connect to PC directly as a high-grade USB external sound card, and can be wired to CD player, lossless audio source， and can wirelessly connect to smart phone by Bluetooth, very convenient.
Excellent sound quality: using classic 6N3 tube, warm and charming tone, very balanced, clear and delicate sound, dynamically
With Treble and Bass Function: users can adjust freely according to different parameters of their own speaker device to achieve ideal HiFi sound quality.
High-end Material:
Bluetooth 5.0 module
using QCC3003 chip supporting A2DP, AVRCP, HFP, AAC, 12S and so on. 16M SPI FLASH storage chip, lossless decoding transmission with farther distance, more stable speed.
Bluetooth decoding
using the latest US ES9023, Hyperstream architecture and time-domain jitter cancellation technology enable jitter-free recording quality with a dynamic range of 112 decibels.
USB sound card
using BB PCM2704, the sound quality output is warm and the sound field is open.
Parameters
Audio Input: USB-PC / 3.5mm Stereo / Wireless Bluetooth 5.0
Audio Output: RCA
Power Supply: DC 12V (adapter is equipped and global universal)
Bluetooth Chip: QCC3003+ES9023
USB Chip: US BB PCM2704
PCM2704 Parameters
Distortion: THD + N: 0.006% (RL > 10kΩ)
Distortion: THD + N: 0.025% (RL = 32Ω)
SNR: 99 decibels
Dynamic range: 99 dB
Support sampling rate: 16Bit 32k, 44.1k, 48k
Dimensions: 138*116*32mm
Packing List
1* HiFi Preamp
1* Power Supply
2* 6N3 Tube
1* Bluetooth Antenna
1* USB Cable
Common reasons for background noise
:
1. Audio cables are with poor quality.
2. Audio source. If the source itself has noise, the pre-amplifier will amplify its noise.
3. The tube is not plugged into the base correctly.
Payment
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About us
Contact us
Payment
Safe and secure payment by PayPal.
Delivery details
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).
Return Policy
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
.
Feedback is very important to us just like our lives, please DO contact us before you leave a neutral
or negative
feedback, we will provide better solutions until you are satisfied.
About us
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.
Contact us
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-Friday
09:00 AM - 18:00 AM
New York(US)
Sunday to Thursday
08:00 PM - 05:00 AM
London(UK)
Monday-Friday
01:00 AM - 10:00 AM
Paris(FR)
Monday-Friday
02:00 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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