iBasso PB5 Osprey front quarter over white background
iBasso PB5 Osprey front left quarter over white background
iBasso PB5 Osprey top quarter over white background
iBasso PB5 Osprey front quarter over dark background
iBasso PB5 Osprey rear quarter highlighting power switch and USB port
iBasso PB5 Osprey front quarter with connected DX320 Max over dark background

iBasso PB5 OSPREY | Balanced Portable Tube Amp

Sale price$1,499.00


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Experience the Magic of Tube Amps in Your Pocket with iBasso PB5 OSPREY

  • Powered by Dual Nutube 6P1 vacuum tubes
  • Uses an advanced power supply with 6 (!!!) batteries to provide consistency electrical separation between components
  • 24 Position, 4 Section Stepped Attenuator offers true analog volume control with unrivaled channel balance
  • Cutting edge components and construction

iBasso PB5 with DX320 Max stacked and attached with stock cable

Dual Nutube 6P1 Vacuum Tubes

Manufactured by KORG and Noritake, the 6th Gen Nutube operates exactly as a conventional triode vacuum tube and creates the same characteristic rich overtones that are sought after in triode tubes. At the same time, Nutube achieves substantial power savings, miniaturization, and quality improvements when compared with many conventional vacuum tubes. Voltage amplification is achieved with the Nutube, which results in a captivating and distinctive vacuum tube sound, all while maintaining exceptional linearity.

dual Nutubes closeup removed from PB5

Efficient Pure Power Supply

The PB5 utilizes six batteries to establish a robust power supply system. The Nutubes are powered by 2 batteries while the other 4 batteries function as the power supply for the secondary amplifier. With an efficient and pure power supply, you will experience immersive and crystal-clear sound.

24 Position, 4 Section Stepped Attenuator

Extremely diminutive 24 position, 4 section stepped attenuator. Optimal analog volume control enhances the ability to showcase the distinct analog characteristics of our vacuum tube amplifier. Channel imbalance is within a range of less than +/-0.1dB. When adjusting the volume, the noise floor is simultaneously attenuated.

iBasso PB5 with exterior removed revealing attenuator components

2-Step Suspension & Cathode Input

The two-step suspension absorbs vibration mechanically and minimizes microphonic effect. The cathode input reduces the impedance, resulting in reduced signal interference from external sources.

Cutting Edge Components for Ultimate Analog Sound

  • 24 position 4 section stepped attenuator with a channel tolerance of less than +/-0.1dB.
  • Texas Instruments classic OPAMP OPA827, known for its exceptional performance and rich analog characteristics.
  • Low VCEsat (BISS) dual transistors with a high output current of up to 2 amps.
  • iBasso custom film capacitors contribute to the natural analog magic.

iBasso PB5 Osprey with case


  • 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 20Hz-40kHz +0.5dB/-2dB
  • Recommended Headphone Impedance: 8~600Ω
  • Input Port: 4.4mm TRRRS BAL
  • Output Port: 4.4mm TRRRS BAL | 3.5mm TRRS SE
  • Gain: +11.5dB (High Gain) | +2dB (Low Gain)
  • Size: 5.4" x 3.2" x 1.1" (139mm x 82mm x 28mm)
  • Weight: 12.4 oz (352g)

In the Box 

  • Protective case
  • (x2) 4.4mm interconnect cables

iBasso PB5 Osprey in the box

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