Vacuum tube amplifiers are known for delivering detailed and transparent sound, that's never too harsh. And the British hi-fi company Quad has been working with tubes since 1940. So they knew the right chords to strike when they created the PA-One headphone amp. They use the term "valves" across the pond, but the beautiful glowing glass and familiar sonic characteristics are universal.


Just don't think this amp is only about the warm feeling of nostalgia. The PA-One is ready to work with modern music sources — there are digital and analog inputs, along with a high-resolution digital-to-analog converter. And it will make the latest and greatest high-end headphones really sing. 

Quad PA-One

SKU: 0261
  • Product highlights:

    • compact, high-performance headphone amp with vacuum tubes
      • pairs well with the Quad ERA-1 planar magnetic headphones
    • combines classic tube amp sound with modern digital features
      • tubes provide dynamic, consistently smooth sound
    • high-resolution 24-bit/192kHz digital-to-analog converter
    • five amplification vacuum tubes:
      • 2 x 6SL7
      • 2 x 6SN7
      • 1 X EZ81
    • high-output power amplifier: 500mW at 32 ohms



    • digital audio inputs: 1 USB (Type B), 1 optical (S/PDIF), and 1 coaxial (S/PDIF)
      • USB driver required for Windows® users; available here
    • stereo unbalanced RCA audio input
    • 1 pair balanced 4-pin XLR line-level inputs



    • 2 full-size 1/4" headphone jacks
    • 1 pair stereo RCA outputs for connection to a compatible audio component


    General Info and Specs:

    • detachable AC power cord
    • signal to noise ratio: 105dB
    • output impedance: 32-300 ohms
    • frequency response: 20-40,000 Hz (0.5dB)
    • 7-1/8"W x 6-1/2"H x 11-1/4"D
    • weight: 16.5 lbs.

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