This one-of-a-kind high-end integrated amplifier was handcrafted with materials and components of the highest quality, observing the strictest production processes and looking after the smallest detail.


Due to its manufacturing philosophy, the I-240 integrated amplifier merges design with functionality, offering versatility, convenience and, most of all, a realistic sound with an appropriate frequency response, low distortion and precise harmonic reproduction.


In the same way, this amplifier will allow you to enjoy a captivating, engaging and natural sound since its conceptualization and development are built on the implementation of our Neuro-Acoustic Alignment technology (ANA®) based on the way the human brain perceives sound, prioritizing harmonic structure over fundamental tone.


The I-240 is a tube integrated amplification and preamplification system (based on the legendary U280 ASB, which is a reference in the audio world) that recreates realistic and dynamic scenarios thanks to the fusion between the application of cutting-edge technology and the tonal benefits of the tubes: the formula of Casa Margules’ characteristic sound.



This amplifier incorporates our exclusive Active Servo Bias (patent pending), which guarantees an optimal operation since it does not require any polarization adjustment, always operating at pure Class-A to ensure a detailed sound scenario.

By continuously adjusting the polarization based on the signal, this circuit radically extends the useful life of the output tubes and allows them an ideal operation, which in addition optimizes energy consumption by avoiding overheating.



The output tubes are configured to operate in ultra-linear mode in order to improve the efficiency in amplification.



The power supplies for the small-signal stages are independent and of the SHUNT type.

By not having a control loop circuit, they avoid the induction of harmonics, guaranteeing the integrity of the audio signal.

Another advantage of the SHUNT power supplies lies in the carefully designed circuit to protect them from the common and uncommon defects of the tubes, which makes them practically indestructible.



On the other hand, the I-240 avoids the use of negative feedback, a common practice that results in a loss of details and sound richness.



In order to improve the damping factor without recurring to negative feedback, Margules Audio has developed the Back Electromotive Force Sensor system or BEFS, which changes the output impedance of the amplifier per the load requirement.

The optimal impedance of the equipment ranges between 4 and 8 Ohms, which is already pre-set. Hence, the BEFS together with the Active Servo Bias allow the amplifier to drive with excellent dynamics and controlled bass the difficult loads in low-efficiency or low-sensitivity speakers.



As to connectivity, the I-240 comes with three different line inputs and an attenuation or high precision volume control, which allow the use of the equipment with several sources.



The ANA® technology (Neuro-Acoustic Alignment) is one of Margules’ technological innovations developed from a fundamental principle: the human brain perceives sound by prioritizing the harmonic structure above fundamental tone; that is, it focuses on how humans perceive sound and not on how we measure it.

This technological advance originates from the engaging sound theory and is based on the way in which our brain decodes the information from the sound waves through the ears: when sounds are closer, they keep us focused due to the relation between perception and sound, the distance at which we perceive them and their intelligibility, whereas distant sounds, even when intelligible, do not catch our attention and are easily ignored.

Our ANA® technology is designed to achieve a realistic sound, with a wide frequency response, low distortion and precise harmonic reproduction, optimizing to the utmost the relationship between the source and the receiver, so that you can enjoy your music in a way you have never experienced before.





Power at 8 Ohms:

25 watts per channel


Response in frequency:

-3dB 10Hz – 40KHz


Total Harmonic Distortion (THD):

0.15% at 1 Watt 0.7% at Full Power


Bandwidth (full power):

30 – 30,000 Hz


Supply voltage:

120 VAC


Electrical consumption:

Stand-by mode:  145 Watts


Maximum consumption:

350 Watts



Height: 19 cm

Width: 40 cm

Depth: 38 cm


Vacuum Tubes:

4 x EL34 (6L6, KT66, KT77, 6CA7)

4 x 12AU7


* Specifications are subject to change without notice.



Like all the Margules products, the I-240 integrated amplifier comes with a five-year limited warranty on parts and labor excluding the tubes, which are covered by a three-month warranty.


Terms and Conditions


The warranty does not cover any damage, wear or malfunctioning caused by lack of compliance with the operation specifications included with this equipment, or any of those resulting from:


  • Accidents, natural disasters or events that happens due to natural causes.
  • Misuse, abuse of or negligence regarding the equipment.
  • Fault in the initial set-up and installation, incorrect maintenance, and/or inadequate cleaning of the product.
  • Repairs, modifications, or renovations performed by people or companies not expressly authorized by Margules Audio.
  • Damage during shipping, transport, packaging, or manipulation of the equipment. In this case, all damage claims must be submitted to the carrier company.
  • Any other cause not attributable to a manufacturing defect of the product.


The warranty covers exclusively the expense corresponding to labor and the material necessary to the repair or, give the case, the substitution of the equipment (at the discretion of Margules Audio), and thus it does not extend to:


  • Accessories, including but not limited to: batteries, cables, mounting hardware, brackets, furniture, cleaning accessories, antennas or dismountable feeding cables.
  • Shipping costs in case the owner needs to return the unit to Margules Audio for the purpose of service or repair of a possible defect.


The warranty shall be void if:


  • The serial number of the equipment has been altered, modified, or deleted.
  • The product has been purchased from a person or company that is not an authorized distributor of Margules Audio.


This warranty extends to products directly purchased from Margules Audio or an authorized distributor.


In case of doubt regarding the scope of the warranty or if you need technical support, call the numbers you will find on our website www.margules.com.