Little Bear B4 Audio Amplifier HiFi Portable Vacuum Valve Tube Headphone AMP Silver

  • 1 - 49 Pieces
  • 50 - 99 Pieces
  • >=100 Pieces
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Quick Details
Brand Name:
Model Number:
Car Amplifier
2 (2.0)
Place of Origin:
Guangdong, China
Frequency response range:
Lithium batteries
Charging time:
2-2.5 hours to charging full the battery
Working time:
4-4.5 hours
Output power:
Suggest load impedance:
115*69*23 mm
Product Name:
Audio Amplifier
Supply Ability
Supply Ability:
5000 Piece/Pieces per Week Little Bear B4 Audio Amplifier HiFi Portable Vacuum Valve Tube H
Packaging & Delivery
Packaging Details
Little Bear B4 Audio Amplifier HiFi Portable Vacuum Valve Tube Headphone AMP Silver
Lead Time :

Little Bear B4 Audio Amplifier HiFi Portable Vacuum Valve Tube Headphone AMP Silver

Product Description

B4 is a tube headphone amplifier, the sound feels warmer than transistor products. it has built-in battery protection circuit. It powers off after is is fully charged automatically, the charger LED turn to GREEN. Can realize the use of human intelligence. Else. When you charging the battery. This B4 amplifier can’t turn ON until you pull out charger interface.  because we design it work like that, just make battery safe.

Direction for use:
- Ipod/Cellphone/MP3 :connect to B4 INPUT socket by 3.5 to 3.5 audio cable.
- Switch & volume control share the same knob:Please rotate the VOL Knob to the left,then plug in your Headset/earplugs to HEADPHONE socket.
- Turn on your media player, and tune VOL knob from left to right till the volume issuitable.
- Turn off: When you do not want to listen, please take off the headphone,turn down the volune till the machine is powered off.

Notice: when you using B4 with your cellphone,if you fell some “zhi~zhi “ noise into your headphone. That’s usually the cellphone effect it. Sometimes, it’s cellphone WIFI,or 4G signal effect the tube. Then the noise into the sound. That’s normal. Because all tube with some microphone effect case. Solve way is . just move your cellphone as far as possible from the B4.

Performance parameters:
- Frequency response range :0-100K-0.1dB
- Gold-plated input/output socket
- NE5532 OP chip (you can upgrade it to a other better brand OP chip. Like BB  or Muse)
- Original nichicon electrolytic capacitor
- TOP HiFi Original DALE resistors.
- Precision rings resistance.
- Battery: Lithium batteries, voltage:12V, 1000mA
- Charging time: 2-2.5 hours to charging full the battery
- Working time :4-4.5 hours
- Output power :450mW
- SNR :99dB
- Suggest load impedance :16-400Ω
- Size:115*69*23 mm1(Length XWidth X Depth)(The measurement doesn't include the knob size.)
- Reference data for 5899 :
- (A type Amplified state) :
- Heater voltage:6.3V                        Heater current:300mA
- Anode Voltage: 100V                    Cathode resistor: 220 Ω
- power amplification factor:20
- Anode essential resistance:4000Ohm
- Transconductance:5000um/s       Anode circuit:8.5mA
- Grid voltage:-9V

Package Contents:
- 1 x Headphone Amplifier
- 1 x Connection cable
- 2 x Bandages

Packaging & Shipping

 Package: Normally we use the standard exporting packaging. We also can according to clients' request .

 Shipping : 

1. By Couriers: DHL, UPS, FEDEX, TNT are the main courier  we are co-operating at present.

2. By Air: Delivery from the Shanghai airport to customers’ destination city air port.

3. By Sea: Delivery from the Shanghai sea port .


Company Information
TZT has been speciliazing in Business & Industry,Hobbies & Toys,CNC Products and Health care supplies for over 5 years.We committed to enhance customer satisfaction by continually improving the process with a vision of expertise in the field. 
Aiming to provide high quanlity products and great service for buyer,we are strict on product quanlity control and offer instant communication service.Welcome to contact us!

Our Advantages:
-  Free-shipping all over the world.
-  Source only the best consumer goods and ensure the highest quality.
-  Streamline the buying and payment process, and make it as easy as possible.
-  Help the customers all over the world discover products and manufacturers in China.
-  The Shortest order processed time and speed delivery

Q1. Can I have a sample order?

A: Yes, we welcome sample order to test and check quality.


Q2. What about the lead time?

A: Samples arrived often need 3-5 days.


Q3. Do you have any MOQ (minimum order quality)limit?

A: Low MOQ, 1pc for sample checking is available.


Q4. How do you ship the goods and how long does it take to arrive?

A: We often ship by DHL, UPS, FedEx or TNT. It usually takes 3-5 days to arrive. Airline and sea shipping is also optional.


Q5. How to proceed an order?

A: Initially, let us know your requirements or application. Besides, We quote according to your requirements or our suggestions. Thirdly, customers confirms the samples and places deposit for formal order. Finally, We arrange the production.


Q6. Is it acceptable to print my logo on the product?

A: Yes. Please inform us formally before our product and confirm the design firstly based on our sample.


Q7: Do you offer guarantee for the products?

A: Yes, we offer one-year warranty for our products.


Q8: How to deal with the flaw?

A: Our products are produced in strict quality control system and the percent of pass is often maintained over 99.8%



Contact us

Please do not hesitate to contact me if you need any further information

Whatsapp/Tel:+8619902906050/ +8613316877875

Wechat: +8619902906050/17722596836


Address:Room 303 Building 2 Youpin Cultural and Creative Park, Zhangkeng Minzhi Street, Longhua District 
China (Mainland)

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