Description
Margules U280-SC 30th Anniversary Limited Edition Tube Preamplifier
ZERO NEGATIVE FEEDBACK
The U-280 SC 30th Anniversary LTD avoids the use of negative feedback, a common practice that results in a loss of details and sound richness.
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.
TRIODE / ULTRA-LINEAR OPERATION
The output stage valves can be configured through the simple operation of a switch (triodes/pentodes), changing the transfer function, optimizing efficiency and tonal characteristics.
SHUNT REGULATED POWER SUPPLY
The power supply for the small-signal stages is independent and of the SHUNT type. By not having a control loop circuit, avoids 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.
ZERO NEGATIVE FEEDBACK
On the other hand, the U-280 SC 30th Anniversary LTD avoids the use of negative feedback, a common practice that results in a loss of details and sound richness.
BACK ELECTROMOTIVE FORCE SENSOR
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 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.
NEURO-ACOUSTIC ALIGNMENT (ANA®)
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.
SPECIFICATIONS
Power at 4 – 8 Ohms:
Triode Stereo: 25 watts per channel
Ultralinear Stereo: 50 watts per channel
Triode Mono: 55 watts
Ultralinear Mono: 100 watts
Frequency Response:
-3dB 20Hz – 40KHz
Total Harmonic Distortion (THD):
>0.08%
Supply voltage:
120 VAC
Electrical consumption (Max.):
585 Watts
Dimensions:
Height: 22 cm
Width: 45 cm
Depth: 35 cm
Weight: 30.5 kg
Vacuum Tubes:
4 x KT88 (6550, KT90, KT120, KT150)
4 x 12AU7
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