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Ayon Sigma

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Ayon Audio “The Bugatti of Audio”

The Absolute Sound Magazine Award


Ayon Sigma DAC – Vacuum Tube DAC – Volume Control

Finest, award winning, Vacuum Tube DAC – at ANY Price!

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Product Description

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Ayon Sigma DAC – Vacuum Tube DAC – Volume Control

Manufactured in Austria, based on the Ayon Stealth DAC platform, the Sigma is an excellent performer. The Sigma is a reference quality DAC, Pre-amplifier.

We hate to sound like a broken record, but the Ayon gear qualifies by the following statement: Ayon Audio has really outdone themselves again! Every time a new model is released, which is about every 4 to 5 years, we think to ourselves – will the new model be even better.

I have to confess we do that here at USA Tube Audio and I can confirm that every time Ayon Audio introduces a new model, we are stunned that Ayon can yet squeeze out a superior performance over their Legacy model being replaced.

Ayon has done it again. The Sigma vacuum tube DAC will amaze and stun you. The soundstage is so realistic to the live event, the Sigma is so good, that your speakers will disappear during playback. Wall to wall three dimensional performance!

The Sigma can do it all – computer playback DSD professional audio use. 1x 6H30 dual triodes per channel. The 6H30’s are so liquid, you will find yourself fully captivated and engaged.

The Sigma will prove to be an intricate component, a must have machine in your system.

Features & Design

The Ayon Sigma vacuum tube DAC is a world class DAC and 100% analog Preamplifier
Pure Class A triode vacuum tube operation, RCA and XLR balanced

Signal Path
Ayon believes in the shortest signal paths. Advanced circuit design – Pure Class A operation!

  • Monitored sequenced soft start – extended tube life
  • Warm up function
  • Zero negative feedback
  • Ultra short signal path
  • Simplest direct circuit path
  • Low output impedance
  • No solid state devices – analog tube output
  • Minimal discrete wiring
  • No followers or buffers
  • Premium quality parts throughout
  • Fully hand assembled superb craftsmanship
  • Independent analog output stage – left and right channel
  • Analog inputs RCA & XLR Balanced
  • All digital inputs included
  • Internal hardware PCM upsampler for CD sources to 24/192K (can be disabled)
  • Native 192kHz PCM and DSDx128 conversion
  • Ultra-low jitter internal clock generator
  • USB input 24/192 asynchronous  and DSD – Volume control

HD Power Supply
HD power supplies have enhanced AC line noise conditioning. Separate power transformer windings provide a pure power source serving the Quad 4x 6H30 output stage.

Electrolytic capacitors with huge electrical storage capacity.

  • R-Core Low noise power transformer – digital & analog
  • 2x 6H30 output stage
  • HD power supply provides a high speed energy
  • Independent, isolated power supplies for each stage of amplification
  • Monitored DC filament – soft start extending tube life to 8k hours
  • AC power line conditioner.
  • 6 independent voltage regulators

Premium Components
Hand selected premium components

  • Premium High speed audiophile coupling capacitors
  • Premium quality tube sockets – gold pins
  • Premium capacitors MKP 2%
  • Premium quality  RCA & XLR connectors
  • Gold PCB

Exquisite Construction
Aircraft grade aluminum chassis. Elegant brushed aluminum. Anti resonance, non magnetic chassis. Hand assembled superb level of craftsmanship.

  • Panel engraving
  • Aluminum feet – resonance absorbing
  • Chassis finish: black


Digital/Analog ConverterAyon Sigma
Conversion32 bit, PCM up to 192k, 64xDSD, 128xDSD
DAC configuration8 mono DACs to 2- stereo outs
Tube complement – Analog output6H30
Dynamic range> 128dB
Output level @1 kHz / Rms0-10V
Output impedance  Single-Ended-RCA~ 300 Ohms
Output impedance  Balanced-XLR~ 300 Ohms
Digital input1 x S/PDIF, 1 x AES/EBU, 1 x Toslink,
1 x BNC, 1 x USB, 1 x I2S, 1 x DoP,
3 x BNC for DSD
Analog inputs & outputsRCA & XLR
S/N ratio> 120 dB
Frequency response 20Hz – 20kHz  +/- 0.2dB
Total harmonic distortion @ 1kHz< 0.002%
Remote controlYes
Dimension (WxDxH) cm18.89 x 14.17 x 4.33 inches
Weight39 lbs
 Specifications subject to change without notice


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Digital/Analog Converter

Ayon Sigma Vacuum Tube DAC with Volume Control


32 bit, PCM up to 192k, 64xDSD, 128xDSD

DAC configuration

8 mono DACs to 2- stereo outs

Tube complement – Analog output


Dynamic range

> 128dB 

Output level @1 kHz / Rms


Output impedance  Single-Ended-RCA

~ 300 Ohms

Output impedance  Balanced-XLR

~ 300 Ohms

Digital input

1 x S/PDIF, 1 x AES/EBU, 1 x Toslink, 
1 x BNC, 1 x USB, 1 x I2S, 1 x DoP, 
3 x BNC for DSD

Analog output


S/N ratio

> 120 dB

Frequency response

 20Hz – 20kHz  +/- 0.2dB

Total harmonic distortion @ 1kHz

< 0.002%

Remote control


Dimension (WxDxH)

18.89 x 14.17 x 4.33 inches


39 lbs

 Specifications subject to change without notice