Little Bear B4 B4-X
Little Bear B4 Dual Tube HiFi Audiophile Portable Headphone Amplifier
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
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
Suggest load impedance :16-200Ω
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:4000Ω
Transconductance:5000um/s Anode circuit:8.5mA
B4 headphone amplifier
Charger (work volrage:110~240V, output voltage 12.6V, Dc socket: 3.5/1.35)
2 x straps
3.5 to 3.5 audio cable
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.
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
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)
B4-X Headphone amplifier
3.5mm audio cable
Due to the impact of the COVID-19 pandemic, global international shipping will delays. The delay at our Hong Kong post office is very serious, so we have changed to other fastest or most efficient international shipping. Now the normal estimated delivery time may be delayed by about 1-2 weeks. In some countries where is higher free-tax rate, we will provide free courier service as much as possible.
All listed items will be shipped though Registered Airmail with tracking number if there is no extra shipping method option listed or shipping description in the product page.
Economy shipping: Will be shipped without tracking number.
Registered Airmail : Will be shipped via such as Hong Kong post , Deutsche Post , Netherlands Post , Singapore Post, you can leave us a message if you have any requirement about the shipping method .
It will be shipped via Hong Kong Post by default, Europe countries can choose to be shipped via Deutsche Post or Netherlands Post, it is also FREE, pls leave us a message if needed.
Express service: Will be shipped via DHL/EMS/UPS/FedEx