Ayon AURIS II “Reference” preamp

Since its market launch in 2014 the Auris has gained an excellent reputation worldwide and it is one of the rare tube preamps capable of transferring its fabulous tonal characteristics to the best advantage to the rest of the installation or respectively co-impress it. All this caused us to further consequently fine-tune it in the background to make this preamp even more exceptional and put it to the utmost in every detail. We have reworked the output stage, the power supply, the phono stage (new phono re-design) ant the quality of the components has been readjusted on the decisive points, 

The low Output Impedance purist parallel Single-ended 6H30 circuit topology is using zero dB negative feedback. The Line Gain is customer Switchable, 0dB or +6dB. Therefore, the Auris II preamplifier is also very flexible in combination with any type of main amplifier. Of course, we have retained and even intensified the modular and upgradeable concept. Options unbalanced or fully balanced, Signature version and Phono MM/MC-H, MC option for all varieties. All existing Auris I version preamps can be retrofitted to the newest version II.

This “Reference” preamp represents the highest standard of preamp based on 6H30 design achievement. Excellence in engineering, a special tube rectified power supply and superior premium components provides a special magic to the reproduction of music. The performance of the new Auris II is outstanding, very musical and neutral, transparent and vivid in its presentation. There is a huge space of the recording environment reproduced with uncanny realism. It offers a holographic soundstage previously unavailable at this price class. 

Pictures

 

 

Features & Design

Full-featured class A single-ended & true balanced triode vacuum tube stereo preamplifier    


Vacuum Tubes

We believe that the simplest circuits work best together with the shortest signal path. 

The shorter the signal path is, the less possibility of sonic degradation from various sources, including the wire itself. Even on the circuit boards, the copper traces are kept to a very minimum length. The completely redesigned circuit board provides a more straightforward and direct approach to the signal paths.


Signal Path

We believe that the simplest circuits work best together with the shortest signal path. 

The shorter the signal path is, the less possibility of sonic degradation from various sources, including the wire itself. Even on the circuit boards, the copper traces are kept to a very minimum length. The completely redesigned circuit board provides a more straightforward and direct approach to the signal paths.

  • Very short signal path
  • Simplest direct circuit path for purest musical sound and high reliability
  • Low output impedance to drive any tube or solid-state power amp
  • High current and low impedance design that operates tubes in the best areas their curves
  • Minimal discrete wiring for optimum signal propagation
  • High quality parts throughout
  • Selector switch engages relays located near RCA jacks to switch all inputs


Tube - Power Supply

The power supplies have been further refined with new components and enhanced AC line noise filtration. Low noise power transformer, chokes and filters provide total isolation between the input and output stages which makes this a pure power source. 

We also use electrolytic capacitors with much larger storage capacity to make up for the loss in filtering when using resistors in lieu of inductors.

  • Tube rectified power supply
  • Superior noise reduction
  • Low noise –insulated power transformers
  • Power transformers are excellent damped and RFI/EMI ultra-shielded
  • Innovative power supply provides a high-speed energy delivery on transients
  • Dual choke filtered power supply for 6H30 tubes
  • Separate and isolated power supplies over each stage of amplification
  • Regulated DC filament supplies with soft-start power up for extended tube life
  • AC power line filter to avoid noise and hash from entering into the unit.
  • High capacitance energy storage.


Dual Grounding System

The modification of the grounding topology leads to increased rejection of noise from the power supply and other areas. The dual grounding topology used in all of our amplifiers is quite unique to the whole hi-end tube amplification industry. Such extensive topology provides for quieter backdrop for which the music can unfold in its entirety. 

It further establishes the quick and controlled bass response and the full-bodied expression of the high frequency. The ground leg of the signal has not been neglected and given meticulous attention in its implementation. The importance of proper grounding cannot be over emphasized.

  • Central one-point star earth grounding
  • Dual grounding system


Components

The type of parts used therefore must have a synergistic relationship to the circuit they are placed in. It is this relationship of which type of part to use where, that ranks our products apart from the mass.


Mechanical and Electrical Construction

The high-grade aluminium chassis impart a richer, more lustrous tonality with a cleaner background and less hash and grain. All brushed anodized anti-vibration resonance and 

non-magnetic chassis is fully hand assembled to insure the highest level of craftsmanship.

  • High selected, best quality passive components used in all applications
  • High speed & high-quality audiophile grade coupling capacitors
  • Special tube sockets with beryllium- copper spring pins
  • High quality – RCA input jack
  • Neutrik / Swiss - XLR connectors
  • Special isolated - internal wiring
  • Gold-plated industrial grade PCB
  • High quality Input selector
  • High quality Balanced Volume control
  • Quadrable electrically-controlled analog volume control
  • Improved heat ventilation chassis
  • 2 chrome knobs, custom-made for Ayon
  • The aluminium feet are resonance absorbing types
  • IR metal remote commander
  • Chassis finish: Black

Optional Phono Board

The optional Phono Amplifier contains the best possible Parts available on the Market today. It has a Gain of 45 dB for MM or MC-H Cartridges and 65 dB Gain for low Output MC Cartridges. The Input Load is fixed 47 K for MM-MCH. Remote selectable Load 100 Ohm, 470 Ohm and 1 K for MC.

Specifications

Tube Preamplifier

Ayon Auris II

Class of Operation

Pure Class A, Triode

Tube Complement: Line

6H30

Maximum Output (at 1 kHz )

~ 20V rms

S/N ratio

> 98 dB

Input Impedance

100 KOhm

Output Impedance

~ 300 Ohm

Frequency Response / Line

 5Hz - 125kHz / -3dB  

Harmonic Distortion (at 1V ) Line

 < 0.01%

Input

4 x Line-RCA, 1 x Phono MM or MC-H, MC, (1 x HT-RCA), 2 x Line-XLR

Output

2x RCA, 1x XLR , 1x Tape out

Line Output Gain

Switchable 0dB or +6dB

Max. Phono Gain MM/MC-H / Line Output

45dB or 51dB

Max. Gain Phono MC / Line Output

65dB or 71dB

Input Impedance Phono MM/MC-H

47 KOhm

Input Impedance Phono MC

100 Ohm, 470 Ohm, 1 KOhm

Input Capacitance

100pF

RIAA Frequency Response

<0.2dB / 25Hz-20 kHz

Rumble Filter

10 Hz / -6dB

Dimensions (WxDxH) cm

50x43x11 cm

Weight

19 kg