Little Bear B4 Portable Vacuum & Valve Tube Headphone Amplifier HiFi for Phone

Performance parameters: 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 ...

Little Bear B4 Portable Vacuum&Valve Tube Headphone Amplifier Stereo Hi-Fi Amp built-in battery

Performance parameters: 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 ...