QUAD  PA - ONE   Headphone Amplifier


The QUAD PA-One is a highly versatile, user-friendly headphone and pre amplifier. It combines classic quad valve topology with a modern selection of digital inputs and outputs for low and high impedance headphones too. With classic QUAD styling and a life-like sound quality, the PA-One is perfect for enjoying music personally via your laptop as well as being an integral pre-amp in a larger hi-fi system too.

Get The Best Out Of Your Headphones
...The Quad PA-One, however, is dedicated to achieving the best possible sound quality of any set of headphones connected to it. 

A whole host of connections, both analogue and digital driven by hi-fi amplifier valves bring an exciting detail to your music.

With a nod to Peter Walker’s styling and topology of his original valve amplification and superior quality from aesthetics to audio make a truly exquisite amplifier. The sound is full of life, yet without the unwanted colouration many would expect from such amplifiers. The genuine heritage of Quad has been preserved with all the features to enjoy modern audio mediums.

Classic Meets Contemporary

Quad engineers have relied on valve technology for our trademark sound. Referencing the high standards set by the Quad II, valve amplifier as a benchmark, we’re sure you can enjoy a level of audio fidelity which we have consistently delivered since 1936, this time packaged into a personal hi-fi experience.

Carefully selected hi-fi amplification valves; 2× 6SL7, 2 × 6SN7, 1 × EZ81, allow the PA-One to deliver the latest technology in perfect harmony with traditional hi-fi.

True to tradition, the front panel is dominated by a large volume and balance control, while input select and impedance mode controls are in keeping with the rest of our product range for a perfect match.

The valves and electronics are housed in a Lancaster Grey steel chassis which is compact enough for a stand-alone space-saving setup, while it can also be an integral part of a high-end, large scale system.

Connect With Your Music
An amazingly wide variety of digital and analogue sources are on hand. Balanced, RCA, Coaxial, Optical and USB, makes it easy to listen to music without ever having to ponder on decoding different formats. Simple and effective. Additionally, low impedance and high impedance modes enable connection to a plethora of modern, popular headphones.


With the increased popularity of computers as source, the PA-One USB DAC allows you to enjoy listening to digital music sources from a computer or laptop (Windows or Mac) via USB connection. The PA-One is USB 1.1 and 2.0 compliant and supports sampling frequencies ranging from 35kHz to 192kHz, a real treat for any hi-fi enthusiast.


With dedicated gold plated RCA outputs, the PA-One is a pre-amp in its own right and can be integrated into part of a larger hi-fi system, too.


Input Impedance                      50k Ω
Output Power                          500mW at 32 Ω
Output Impedance                   32 Ω - 300 Ω
Impedance Modes                   High / Low
Input Sensitivity                       300mV (500mW at 32 Ω)
Frequency Response                15Hz - 30Hz (+0.5dB, 0.5dB)
Distortion                               0.5% at 1kHz
Channel Balance                    +0.5% at 1 kHz
S/N Ration (ref. 500mW)       105dB (IHF-A)
Inputs                                    2 x Balanced XLR, RCA Phono, Coaxial, Optical & USB
Outputs                                 2 x 6.3mm Jack headphone socket, RCA Phono
Digital Resolution                   44.1kHz, 48kHz, 88.2kHz, 96kHz, 176kHz, 192kHz
Valves                                   2 x 6SL7, 2 x 6SN7, 1 x EZ81
Size (W x D x H)                   180mm x 284.5mm x 163.5mm
Net Weight                           7.5kg

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AUDION FONOS    Silver Night 300B SET Integrated Headphone Amp and Media Center

Audion spent the more than 7 years developing an SET Headphone amp that would be worthy of the Audion name. Trust us, we begged them to jump on the bandwagon and slot in a headphone jack. The refused year after year while quietly building and discarding input and output transformers. Until, finally, they created a SET Headphone amp sounds and works like an Audion Stereo SET with major differences over the competition. It's a remarkable unit.

Firstly, and most importantly, it uses different taps on the output transformers to select any of the 5 impedances. The majority of all headphone amps accomplish this by way of inexpensive resistor networks. Easy to manufacture, not so great for sonics.

Of course, Audion winds their own transformers and is very picky on sonics. The output transformer use M6 laminates which are wired with extremely fine wire to get the number of turns needed for each impedance setting. Only the very most expensive headphone amps and ones costing multiples of Audion's price even consider this process. Also, with this amp you can run 2 sets of headphones at a time (as long as they are the same impedance).


Have different HP amps for your various headphones due to getting one impedance output? No more with the Audion. This replaces all of them because one simple turn of the Impedance selector makes it a new dedicated headphone amp. Truly amazing for its price. --- TA

This is a new breed for Audion. Perhaps one of the finest headphone amps on the planet and certainly one of a rare few that is an SET. The transformer has 5 output impedances: 8, 32 150 300 and 600 ohm of which the 8 ohm tap outputs about 4 watts (can be easily changed to 7 Watts however, Audion found that was too much for sensitive headphones, but it is easily done by the factory if you desire).

There is an optional balanced XLR input/output board which can be fitted as well for XLR requirements and for speaker outputs. All XLR and Headphone 6.3mm sockets are Neutrik.

Audion Silver Night Anniversary amplifiers are all hand built. The Silver Night Stereo range can reproduce subtleties and nuances in music that cannot be found in other amps of this price.  Auto biased and have very conservative watt ratings which is equal to almost twice their rating if tested by competitors methods.

Audion Silver Night Anniversary 300B amplifier is hand built and hard wired (Air Wired©). Audion avoids the use of Chinese components where possible. This triode based stereo amp uses no (zero) feedback in the design.

The new 300B Headphone Integrated Amplifier can be customized for just about any headphone. Driving them to potentials you never though they could achieve.

Audion Silver Night range of amplifiers are the best known of the Audion products, and the ones that have won most awards, notably amp of the year in Japan 2010. The SN 300B hard wired was the amp originally reviewed by Sam Tellig that put Audion’s name onto the map.

The 300B gives a superior  sonic performance from a well know tube. As the Audion brand name is so well known this is based on their most popular selling amp in their line-up. The one that wins hearts and minds.The headphone version of the Audion Silver Night Anniversary is now 6th Generation product, originally being sold in 1987. It was rated "Amp of the year in Japan" and has rave customer and professional reviews.


Components of the Audion HPA:


  • Transformers and chokes are design and handmade by Audion: Mains, chokes and output transformers.

  • As stated, separate windings on the output transformers for each impedance settings.

  • Superior quality parts sourced from Europe or the US. Even the capacitors are made to Audion’s exacting specifications.

  • Chassis’ are finished in-house which includes powder coating and electroplating to ensure quality.

  • Special voicing of Audion amplifiers requires every part be meticulously designed to meet their standards.

  • Every component is hand built usually point to point. Once burned in they listen again in case they are not satisfied before releasing each unit.


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QAUD PA-ONE Headphone Amplifier
Audion Silver Night 300 Headphone Amplifier
Audion Silver Night 300 Headphone Amplifier
Audion Silver Night 300 Headphone Amplifier
Quad PA-ONE Headphone Amplifier with QUAD ERA-1 Headphones
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Enigmacoustics Athena 1 - Silver.jpg


ENIGMACOUSTICS    ATHENA 1  Headphone Amplifier

The Athena A1 is an audiophile’s dream. From its three dimensional soundstage to its ability to faithfully articulate voices and instruments, to separate and fix them in space, the Athena A1 is an engaging and musical headphone amplifier. Designed by a virtuoso engineering team, it is the first headphone amplifier from ENIGMAcoustics. It is also represents the culmination of an exhaustive design effort, hundreds of hours of listening, miles of response curves, and carefully selected parts.


Chosen for their sonic purity and low noise, ECC82/12AU7 triode vacuum tubes, driven in pure Class-A mode, provide the foundation for Athena A1’s single-ended front end. A full-wave 6CA4 vacuum tube rectifier is then employed, followed by an LC smoothing filter. While the Class-A MOS/BJT hybrid output stage is extremely solid and robust, it is a great complement to the single-ended triode front end; and together they render music that flourishes with all the harmonic hues of live music. The output stage exhibits extremely low output impedance, which ensures compatibility with low impedance headphones; and its high output voltage swing also allows Athena A1 to effortlessly drive high impedance headphones as well.


This innovative and bewitchingly musical vacuum tube headphone amplifier may well have re-written the book on SET (Single-Ended Triode) design. Elegantly presented, the Athena A1 features a strikingly attractive visual design, glass exterior, and state of the art construction.


Input impedance                                                      10k Ohms

Maximum output Voltage                                           9Vrms

Total power consumption                                           20W

Compatible headphone impedance range                   16–600 Ohms

Circuit configuration                                                  Pure Class-A single-ended triode gain stage with tube rectifier and LC filter

Frequency response                                                  10–200 kHz     (-1dB at 10 Hz, -1.5 dB at 200 kHz)

THD                                                                        Less than 0.07%.      Almost entirely low order.

Dimensions                                                              W 117mm x H 185mm x D 134mm

Net weight                                                               3.5 kg



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Enigmacoustics Combo Offer



HPA [Tube]





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