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iBasso PB5 Osprey: Headphone amplifier using Korg Nutube 6P1 tubes

iBasso PB5 Osprey iBasso PB5 Osprey
iBasso PB5 Osprey

The iBasso PB5 Osprey is a new portable headphone amplifier powered by miniature Japanese Nutube 6P1 tubes from Korg.

iBasso PB5 Osprey

TWO NUTUBE 6P1 TUBE TUBE
Manufactured by KORG and Noritake, the 6th Generation Nutube operates exactly like conventional triode vacuum tubes and produces the same characteristic rich overtones that are loved in triode tubes. Voltage amplification is achieved using Nutube, resulting in an exciting and distinctive vacuum tube sound while maintaining exceptional linearity.

CLEAN POWER SOURCE
The PB5 uses six batteries to create a reliable power system. Nutubes are powered by 2 batteries and the remaining 4 batteries provide power to the secondary amplifier. With an efficient and clean power supply, you get immersive and crystal clear sound.

24-POSITION, 4-SECTION STAGE ATTENUATOR
Extremely miniature 24-position, 4-section step attenuator. Optimal analog volume control allows you to demonstrate the distinct analog characteristics of our vacuum tube amplifier. Channel imbalance is in the range of less than +/-0.1 dB.

iBasso PB5 Osprey

Characteristics of iBasso PB5 Osprey:

  • Output Voltage: 9Vrms (4.4mm BAL) | 4.5Vmrs (3.5mm SE)
  • Output Power: 1700mW+1700mW @ 32Ω
  • Output Impedance: 0.25Ω (4.4mm BAL) | 0Ω (3.5mm SE)
  • Frequency response 20 Hz-40 kHz +0.5 dB/-2 dB
  • Recommended headphone impedance: 8~600Ω
  • Input port: 4.4mm TRRRS BAL
  • Output Port: 4.4mm TRRRS BAL | 3.5 mm TRRS SE
  • Gain: +11.5 dB (High Gain) | +2 dB (Low Gain)
  • Size: 139mm x 82mm x 28mm
  • Weight: 352 g

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