Ayon Audio Orthos XS Monoblock Amplifier

Ayon Audio Orthos XS Tube Monoblock Amplifier 

We are proud to introduce our latest third-generation KT88 mono power amplifier, the Orthos XS. The Orthos XS monoblocks provide true balanced or single-ended operation combined with the ability to deliver 250 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 KT88 power amplifier in the world.

The Orthos XS is also available with KT150 power tubes!

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.

Manufacturer’s website AYON Audio

Please find reviews below



Ayon Orthos XS Specifications:

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 )

~ 1200mV

S/N ratio at full power

98 dB





Dimensions (WxDxH) cm

35x61x25 cm


50 kg


Weight27 kg