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Little bear B5 Mini Portable Dual Vacuum Tube Headphone Amplifier Audio HiFi Amp

B5 is a mini tube headphone amplifier. the sound feels warmer than transistor products. it adopts built-in battery protection circuit. It will be powered off automatically after fully charged ,and the charge LED turns to green.
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We do not suggest charging the battery and operating the amplifier at the same time. it's bad for battery and there will be loud noise. 

For 6418 tube,there will be some microphone effect. so when you hit or knock the B5 metal shell. You will get some "wing~~~~~~" noise. and that noise will disappeare about after 5 seconds. that's normal. 

Package included: 
  • 1x B5 main amplifier
  • 1x 3.5 to 3.5 cable. for connect your cellphone to B5 amplifier
  • 2x bandages
  • 1x charger
Performance parameters:
  • Frequency response range:0-100K-0.1dB
  • Gold-plated input/output socket
  • PT2308 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: 5~8 hours
  • Output power:80mW
  • SNR:99dB
  • Suggest load impedance :16-100Ω
  • Size:115*60*13 mm(Length XWidth X Depth)
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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