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Quad PA-One+ Valve Headphone Amplifier


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Found it cheaper? Click here. SKU: QuadPA1
Ex VAT: £1,165.83

A top quality valve amplifier from Quad, replacing the original PA-one, the plus is designed to make the most of high-end headphones 

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Condition: Brand new in original retail packaging

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Warranty length 2 Years
Brand Quad HiFi
Product Award HiFi World 5 Globes

Tech Specs

- Input Impedance: 50kΩ
- Output Power: 500mW(@ 32Ω )
- Output Impedance: 32Ω~300Ω
- Input Sensitivity: 300mV
- Freq Response: 20~20k Hz (0/-0.5dB)
- Distortion: 0.5% at 1kHz
- Channel Balance: ±0.5dB
- S/N Ratio: 90dB
- Vacuum Tubes: 2x 6SL7, 2x 6SN7
- Digital Sampling: 44.1-192kHz
- USB Sampling: 384kHz, DSD256
- In: 3-pin bal, RCA, USB, Coax, Opt
- Out: Stnd/4-pin bal headphone, RCA
- Dimensions (WDH): 180 x 260 x 170mm
- Net Weight: 6.5kg

Product Description

Quad PA-One+ Valve Headphone Amplifier is a truly flexible and user-friendly model that has been produced to seamlessly cater to all headphone devotees, driving premium hi-fi headphones and delivering the exceptional sound quality Quad amplifier owners have long enjoyed... not through speakers but through your headphones.

What’s New?

Quad PA-One+ Valve Headphone Amplifier features a re-engineered board for a greater output power of 500mW into 32ohms, broader frequency response and vastly enhanced signal to noise ratio. The inclusion of an improved ESS Sabre 9018 K2M DAC enables PCM playback up to 384kHz and DSD256. The internal QUAD valve circuitry is also redesigned for more efficient performance.

Premium Valves

Quad PA-One+ uses carefully selected dual 6SL7 and dual 6SN7 amplification valves to deliver the latest technology in perfect harmony with traditional Hi-Fi.

Different Formats

Designed to help high-end headphones reach their full potential through radically improved amplification, the effortless and effective PA-One+ supports a remarkably wide selection of digital and analogue sources so you can enjoy music without needing to worry about decoding different formats.


PA-One Plus offers a range of analogue inputs for maximum versatility including gold plated RCA input, 6.3mm headphone jack, 4-pin XLR balanced headphone input, 3-pin XLR balanced input and gold plated RCA pre-out (for use as a Pre-amp). Digital connections are also catered for via USB input with PCM playback up to 384kHz and DSD256 and gold plated coaxial and optical inputs.

Press Reviews

  • 'HiFi World 5 Globes... Easily the best headphone amp out there' (Hi-Fi World magazine, August 2015 for the PA-One)

  • 'Much like any good valve amplifier, the PA-One brings the dynamism of the valve sound. as well as its smoothness, to headphone listening. With my Fidelio X1s synergy was almost perfect: their low sensitivity was of no consequence at all. With my classic rock test track of the Eagles careering through 'Somebody' (ripped from CD to 24/96) the PA-One kicked them hard, putting muscle behind Schmit's strenuous bass line that seemed faster than I can usually hear it...swapping over to Oppo PM-1 planar magnetic headphones showed the PA-One is relatively unaffected by headphone balance. The Oppos usually sound quite warm up top but the PA-One imposed its own will and dynamism, lessening this quality' (Hi-Fi World magazine, August 2015)

  • 'If you really value headphone listening then the PA-One is a must-have. It suits all headphones and really kicks them into life. With superb dynamics and easy-on-the-ear smoothness...this unit is easily the best headphone amp out there, providing you don't want to carry it around in your back pocket!' (Hi-Fi World magazine, August 2015)

  • ''Verdict: One of the best sounding headphone amplifiers available, a wide range of inputs offering unrestricted hi-res PCM playback' (Hi-Fi World magazine, August 2015)

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