Little Bear B4-X Transportable Twin-Mono Vacuum Tube Headphone Amplifier; Mini Balanced Audio Headphone Amp B4 Improve Model

Worth: $109.99
(as of Jul 09,2022 07:19:08 UTC – Particulars)

Parameters:
Tube: USA RAYTHEON JAN5899 ×2
Op amp: NE5532*2 (will be upgraded )
Lithium Battery: 12V, 1000mA
Charging time: 2-2.5 hours
Working time: 4-4.5 hours
Output energy: 450mW
SNR: 105dB
Recommend load impedance: 16-300Ω
Output: 2.5 balanced Jack*1, 3.5mm Jack *1
Dimension (L*W*D): 115*69*23 mm / 4.5*2.7*0.9 in (with out knobs)

Packing Record:
1× headphone amplifier
1× energy provide
1× 3.5mm audio cable
2× band

Discover:
When utilizing B4-X along with your cellphone, for those who heard some “zhi ~ zhi” noise in your headphone. In all probability it’s the inteference out of your cellphone such like WIFI or 4G sign, which intefers the tube and trigger noise. That is regular. As a result of there are microphone impact with all tubes. To keep away from it, please preserve your cellphone distant from B4-X.

Q&A:
Q: Tried totally different supply and headphones, however the precise channel nonetheless has static.
A: Perhaps the tube has a poor contact after lengthy transport course of, open the chasis and modify the screw close to the tube whereas listening (for those who can not discover it, contact us and we offers you a photograph with marks that will help you). Perhaps the tube is damaged, you should buy a 5899 tube in native retailers. And we are going to refund you the fee.
Q: It broke simply now 4 loud pops and it is would not work now.
A: Primarily as a result of the battery is run out of energy. Please cost it. If no assist, please contact us.
Q: The Amp has plenty of digital suggestions/interference when a cellphone is close by. It creates popping within the headphones.
A: Vacuum tubes are simple to be interfered by units that may switch siganl like cellphones, routers. Please preserve the amp away from them.
Q: It can’t be charged, one thing is free contained in the charger.
A: Perhaps the charger is damaged. Contact us to get a brand new one please.

② B4-X adopts 2 teams of unbiased energy provide(+12V and -12V) for two op amps, much less mutual results and may drive 300Ω headphones. ③ The circuit adopts twin op amp parallel output, with greater output energy. ④ B4-X has 3.5mm and a pair of.5mm 2 sorts of output interface, appropriate for many of balanced and customary headphones.
Mini dimension and distinctive design: built-in tube makes you have got a tube amplifier which will be held by one hand, handy to hold and may take pleasure in HiFi music in every single place. Full, delicate and comfortable sound: hotter than transistors, unbiased op amp and energy provide inhance the SNR and diploma of separation, much less interaction and better sound high quality.
With built-in battery safety circuit: battery lets your listening feast with out time limitation. It may possibly’t be turned on throughout charging and can energy off mechanically after totally charged, and charger LED will flip to inexperienced.
Excessive-end making materials and craft: utilizing gold-plated socket, authentic nichicon electrolytic capacitor, authentic DALE resistors and precision ring resistance. Immediate and courteous customer support.