AIYIMA ES9038 Decoder DAC CSR8675 Bluetooth APTX HD LDAC Stereo Headphone Amplifier 24Bit 96KHz Input USB Coaxial RCA AUX Output
123.47 96.31 $
ID: 24487
Quantity
Little Bear B4-X Balance Portable Dual-Tube valve cellphone headphone amplifier amp
0.0 ( votes)
Price:
US $
183.06
/ piece
- Little Bear B4-X Dual-Mono Balanced Tube Headphone Amplifier
The difference between B4 and B4-X
1. B4-X is a dual-mono balanced version. Its left and right channel are amplified by independent components, and power supply, tubes, and op amp are all independent and symmetric. So the degree of sound separation is higher than B4.
2. B4-X adopts 2 groups of independent power supply(+12V and -12V) for 2 op amps, less mutual effects and can drive 300Ω headphones.
3. The circuit adopts dual op amp parallel output, with higher output power.
4. B4-X has 3.5mm and 2.5mm 2 kinds of output interface, suitable for most of balanced and standard headphones.FeaturesMini size and unique design: built-in tube makes you have a tube amplifier which can be held by one hand, convenient to carry and can enjoy HiFi music everywhere.With built-in battery protection circuit: battery lets your listening feast without time limitation. It can't be turned on during charging and will power off automatically after fully charged, and charger LED will turn to green.Full, delicate and soft sound: warmer than transistors, independent op amp and power supply inhance the SNR and degree of separation, less interplay and higher sound quality.High-end making material and craft: using gold-plated socket, original nichicon electrolytic capacitor, original DALE resistors and precision ring resistance.Parameters- Tube: USA RAYTHEON JAN5899 ×2
- Op amp: NE5532*2 (can be upgraded )
- Lithium Battery: 12V, 1000mA
- Charging time: 2-2.5 hours
- Working time: 4-4.5 hours
- Output power: 450mW
- SNR: 105dB
- Suggest load impedance: 16-300Ω
- Output: 2.5 balanced Jack*1, 3.5mm Jack *1
- Size: 115 * 69 * 23 mm (L*W*D) (does not include the knob)
Packing List- 1× headphone amplifier
- 1× power supply
- 1× 3.5mm audio cable
- 2× band
Notice: when using B4-X with your cellphone, if you heard some "zhi ~ zhi" noise in your headphone. Probably it is the inteference from your cellphone such like WIFI or 4G signal, which intefers the tube and cause noise. That's normal. Because there are microphone effect with all tubes. To avoid it, please keep your cellphone far away from B4-X.Q&AQ: Tried different source and headphones, but the right channel still has static.A: Maybe the tube has a poor contact after long shipping process, open the chasis and adjust the screw near the tube while listening (if you cannot find it, contact us and we will give you a photo with marks to help you). Maybe the tube is broken, you can buy a 5899 tube in local shops. And we will refund you the cost.Q: It broke just now four loud pops and it's doesn't work now.A: Mainly because the battery is run out of power. Please charge it. If no help, please contact us.Q: The Amp has a lot of electronic feedback/interference when a cellphone is nearby. It creates popping in the headphones.A: Vacuum tubes are easy to be interfered by devices that can transfer siganl like cellphones, routers. Please keep the amp away from them.Q: It cannot be charged, something is loose inside the charger.A: Maybe the charger is broken. Contact us to get a new one please.
- Dimensions (WxHxD): 120*70*20mm
- Body Material: Aluminum
- WIFI: No
- Bluetooth: No
- DSD (Direct Stream Digital): No
- Operational Amplifier Chips Model: 5532
- Channels: 2.0
- Package: NO
- Output Power: 200mW*2
- Model Number: B4-X
- Type: Mini Amplifier
- Recommended Headphone Maximum Impedance: 151-200 Ohm
- Built-in Battery: Yes
- Output Type: LINE OUT (AUDIO OUT)
- Input Type: LINE IN (AUDIO IN)
- Brand Name: ONE Little Bear
- TUBE: 5899
- Input Type: 3.5 JACK
- Output Type: 3.5 JACK,2.5 Balance Jack
SHIPPING AND DELIVERY
We are proud to offer international shipping services that currently operate in over 200 countries and islands world wide. Nothing means more to us than bringing our customers great value and service. We will continue to grow to meet the needs of all our customers, delivering a service beyond all expectation anywhere in the world.
How do you ship packages?
Packages from our warehouse in China will be shipped by ePacket or EMS depending on the weight and size of the product. Packages shipped from our US warehouse are shipped through USPS.
Do you ship worldwide?
Yes. We provide free shipping to over 200 countries around the world. However, there are some location we are unable to ship to. If you happen to be located in one of those countries we will contact you.
What about customs?
We are not responsible for any custom fees once the items have shipped. By purchasing our products, you consent that one or more packages may be shipped to you and may get custom fees when they arrive to your country.
How long does shipping take?
Shipping time varies by location. These are our estimates:
| Location | *Estimated Shipping Time |
|---|---|
| United States | 10-30 Business days |
| Canada, Europe | 10-30 Business days |
| Australia, New Zealand | 10-30 Business days |
| Central & South America | 15-30 Business days |
Do you provide tracking information?
Yes, you will receive an email once your order ships that contains your tracking information.
My tracking says “no information available at the moment”.
For some shipping companies, it takes 2-5 business days for the tracking information to update on the system.
Will my items be sent in one package?
For logistical reasons, items in the same purchase will sometimes be sent in separate packages, even if you've specified combined shipping.
If you have any other questions, please contact us and we will do our best to help you out.
REFUNDS & RETURNS POLICY
Order cancellation
All orders can be cancelled until they are shipped. If your order has been paid and you need to make a change or cancel an order, you must contact us within 12 hours. Once the packaging and shipping process has started, it can no longer be cancelled.
Refunds
Your satisfaction is our #1 priority. Therefore, if you’d like a refund you can request one no matter the reason.
If you did not receive the product within the guaranteed time(60 days not including 2-5 day processing) you can request a refund or a reshipment.
If you received the wrong item you can request a refund or a reshipment.
If you do not want the product you’ve receive you may request a refund but you must return the item at your expense and the item must be unused.
- Your order did not arrive due to factors within your control (i.e. providing the wrong shipping address)
- Your order did not arrive due to exceptional circumstances outside the control of CNTRONIC Consumer Electronics Retailer (i.e. not cleared by customs, delayed by a natural disaster).
- Other exceptional circumstances outside the control of cntronic.com
*You can submit refund requests within 15 days after the guaranteed period for delivery (60 days) has expired. You can do it by sending a message on Contact Us page
If you are approved for a refund, then your refund will be processed, and a credit will automatically be applied to your credit card or original method of payment, within 14 days.
Exchanges
If for any reason you would like to exchange your product, perhaps for a different size in clothing. You must contact us first and we will guide you through the steps.
Please do not send your purchase back to us unless we authorise you to do so.
LARGE ORDER DEALS
Thank you for your interest doing business with us!
If you would like to get a discounted price for your large purchase orders, fill in the required blanks along with your email address, the product Item ID # and/or the link of the item that you want to order, item quantity (minimum of 30 pieces), shipping country and payment method is required. We will contact you with a discounted price as soon as we receive your inquiry.
