- B5 is a portable vacuum tube headphone amplifier with built-in battery. You can bring it everywhere.
- Differences between Little Bear B4 and B5: B5 is thinner and uses 5899 tubes; B5 can drive 16~100Ω headphones while B4 can drive 16~200Ω; The microphone effect of B5 is more severe than B4; the OP AMP of B5 can’t be replaced while B4 can; B5 is more durable
- For satefy reason, the device can’t work while charging. Charging time: 2~2.5h; Working time: 6~8 h; The indicator will turn to green when charging process is finished.
Package Includes:
1 * B5 main amplifier
1 * 3.5 to 3.5 cable
2 * bands
1 * charger
Performance Parameters:
Frequency response range：0-100K-0.1dB
Gold-plated input/output socket
PT2308 OP chip
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: 5~8 hours
Output power：80mW
SNR：99dB
Suggest load impedance ：16-100Ω
Size：115*60*13 mm (L*W*D)
Reference data for 6418:
(A type Amplified state):
Heater voltage:1.25V Heater current:10mA
Anode Voltage: 60 Cathode resistor: 220 Ω
power amplification factor:20
Anode essential resistance:4000Ω
Transconductance:5000um/s Anode circuit:8.5mA
Grid voltage:-9V
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