new amplifier Nobsound Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier Balanced BLK pre amp Audio Amplifier Boards

new amplifier Nobsound Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier Balanced BLK pre amp Audio Amplifier Boards

Name: new amplifier Nobsound Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier Balanced BLK pre amp
Brand: MMO Dropship
SKU: 32956249162
Price: 149.99 VND
Availability: InStock
Rating: 4.9 (92 reviews)

Code: TD-32956249162 45 orders

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Description
Shipping & Returns

Brand Name:	Nobsound
Maximum Power Per Channel:	NO POWER
Origin:	CN(Origin)
Package:	Yes
Channels:	2 (2.0)
Certification:	CE
Type:	Tube Headphone Amplifier

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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.

Features

Mini 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&A

Q: 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.

s-l1600 s-l1600 (3) s-l1600 (4) s-l1600 (6) s-l1600 (8)

new amplifier Nobsound Little Bear B4-X Portable Dual-Mono Vacuum Tube Headphone Amplifier Balanced BLK pre amp

DELIVERY ESTIMATE

We processes orders between Monday and Friday. Orders will be processed within 5 business days of ordering and shipped the next day after the processing day. Please note that we don't ship on weekends.

We deliver your orders in 15-20 working days (free shipping), International orders delivery is subjected to the policy of third party courier service, and differs from country to country basis.

Due to the Covid-19 pandemic, you may experience delivery delays but we are committed to getting your order to you as soon as possible.

Note: Please ensure all delivery information is correct. If there is incorrect and/or missing information, we may be required to contact you to update the delivery information, which may cause delays in delivering your order. Delays may also occur as a result of customs clearance.

RETURN POLICY

At MMO-Dropship we strive to make our customers 100% satisfied with the product they’ve purchased from us. If you are experiencing any shipping or products issues, and you’re feeling frustrated, then please send us an email and our team will assist you right away.

We have a 7-day return policy, which means you have 7 days after receiving your item to request a return.

To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.

To start a return, you can contact us at [email protected]. If your return is accepted, we’ll send you a return shipping label, as well as instructions on how and where to send your package. Items sent back to us without first requesting a return will not be accepted.

You can always contact us for any return question at [email protected].

DAMAGED ITEM AND LOW QUALITY

For the fastest resolution, please include a photograph demonstrating the poor quality or the damaged area of the item. The most optimal pictures are on a flat surface, with the tag and error clearly displayed.

We will use this information to help you with your order, and eliminate errors in future.

REFUND POLICY

If you feel the product that you’ve purchased does not show the requirements that you initially had in mind, then you do have the option to request a refund.

Here are the circumstances in which refunds will be granted:

You can get a refund if:

You aren't happy with your order: You’ve purchased your MMO-Dropship products in the last 7 days and want to return them, we will process full refund as soon as possible when we receive the items from you

The product you’ve purchased is completely non-functional
You did not receive your product within 60 business days or 90 business days (South America) of purchase

Please note that refunds can take 3-5 business days to return in your account.

You can always contact us for any return question at [email protected].