Orthos XS

We are proud to introduce our latest third-generation KT150 mono power amplifier, the Orthos XS. The Orthos XS monoblocks provide true balanced or single-ended operation combined with the ability to deliver 300 watts per channel.

All the gain stages and power stage have been re-designed and optimized as well to provide for the shortest signal path and the most direct signal flow. The result is a significant advance in sonic performance, wider and deeper holographic soundstage with more fine details and greatly improved powerful bass punch, dynamics and outstanding life-like performance free of compression effects or dynamic limitations. One of the absolutely best sounding KT150 power amplifier in the world.



Full-featured true balanced vacuum tube mono power amplifier Switchable between pentode and triode mode Ideal also for more difficult loudspeaker loads.

Vacuum Tubes

The choice of signal and power tubes have a significant influence on the sound and hence on the inspiration and joy of listening. This is not only the decision between good and bad tubes but finally the interaction of the different types of tubes and their combination that are used in the various Ayon amplifiers.

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.

●  Logical sequenced soft-start power up for extended tube life
●  Power tube and electronic protection circuit system
●  0dB negative feedback  (of any kind )
●  Ultra short signal path
●  Simplest direct circuit path for purest musical sound and high reliability
●  No solid state devices in the signal path
●  High current and low impedance design that operates tubes in the best areas their curves
●  Minimal discrete wiring for optimum signal propagation
●  No followers or buffers in the signal path
●  High quality parts throughout

Power Supply

The power supplies have been further refined with new components and enhanced AC line noise filtration. Separate power transformers, 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.

●  2 separate low noise –insulated power transformers
●  Power transformers are encased, excellent damped and RFI/EMI shielded
●  Innovative power supply provides a high speed energy delivery on transients
●  Dual choke filtered power supply for power tubes
●  Choke for pre and driver stage
●  Separate and isolated power supplies over each stage of amplification
●  Separate high current filament-regulators for pre and driver tubes
●  Regulated DC filament supplies with soft start
●  AC power line filter to avoid noise and hash from entering into the unit.
●  High capacitance energy storage.                       
●  Current in-rush limiting
●  Auto sequencing - Power on cycle completes in 1 minute

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.

●  Ground switch
●  Central one-point star earth grounding
●  Dual grounding system (switchable)

Output Transformer

The super-wide bandwidth output transformer’s major strength is that it can deliver the current in the bass, while at the same time maintaining the speed in the high frequencies, dramatically improving the square wave response of the amplifier. The effect is a much more natural and relaxed sound with much better clarity, resolution and fluidity.

●  Super-wide bandwidth high performance output transformer
●  High efficiency with low insertion loss for optimal current and voltage transfer
●  Multiple tight layering and coupling for extended frequency response
●  Output transformers are sealed with an anti-resonance compound material


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.

●  Selected, premium quality passive components used in all applications
●  High speed  & high quality audiophile grade coupling capacitors
●  Special tube sockets with beryllium - copper spring pins, custom made by Ayon
●  WBT NextGen – binding posts
●  High quality – RCA input jack
●  Neutrik/Swiss - XLR chassis connectors
●  Special isolated - internal wiring
●  Silver-cupper matrix - internal signal cable
●  Gold-plated industrial grade PCB

Mechanical Construction

The high grade aluminum 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’s are fully hand assembled to insure the highest level of craftsmanship.

●  Improved heat ventilation chassis
●  The aluminium feet are resonance absorbing types
●  Backlit “ayon” logo
●  All front & rear panel descriptions are engraved
●  Ground switch
●  Bias analog-instrument with mV scale
●  Chassis finish: black / chrome



Ayon Orthos XS

Class of Operation

Triode* or Pentode mode, Class-A*

Tube Complement 


Load Impedance

4 & 8 Ohms



Output Power /Pentode mode KT150

1 x 300W

Output Power /Triode mode KT150

1 x 180W

Frequency Response

15 Hz - 50 kHz

Input Impedance at 1 kHz

47 KΩ

Input sensitivity ( full power )


S/N ratio at full power

98 dB





Dimensions (WxDxH) cm

35x61x25 cm


50 kg

Specifications subject to change without notice