AUDIOPHONICS MOS-120 Amplifier Class A/B 2x120W / 4 Ohm Black

AUDIOPHONICS Amplifier Class AB LM3886 2x120W / 8 Ohm

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4.8 / 5

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Shipping date: 04-10-2022.

Orders placed before 11AM (GMT+1) will generally be shipped the same day (working day).

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MOS-120 discrete integrated amplifier

Amplifier 2x120W @ 4 Ohm / Volume Control / MOSFET IRFP240 & IRFP9240

Amplifier power mosfet

This integrated amplifier is inspired by PASS circuits and operates two high power MOSFET IRFP240 / IRFP9240. Its power stage offers massive power and detailed sound reproduction. Low frequencies are deep and emphasize the soundstage. Ideal for bringing thick and precise sound to a large room.

Ab class amplifier transistor

Discrete input stage transistors

The design of the input stage involves only discrete components. The signal goes symmetrically through a structure based on pairs of complementary transistors.

It is designed from paired transistors and arranged in a symmetrical structure. The models used are A42 and A92 transistors, capable of withstanding high voltages before distorting the sound.

This configuration limits any bias current before the power stage Class AB, which significantly limit the distortion.

Three integrated levels of protection

The device is equipped with an OMRON relay (switch delay) which ensures effective protection against unwanted noise (crunches and thumps) during power on and power off.

There is also a UPC1237 protection (protection amplifying stage & loudspeakers on each channel with overload detection) / a DC protection and a rectifier bridge at very low resistance.

OMRON amplifier protection
Class AB linear amplifier alim

Linear power supply

To match the specifications of the input stages and amplifier, this amplifier has a linear regulated power supply with a very effective design. This will directly affect the overall sound precision of the amplifier.

This power supply is operating with a diode bridge 50A (Japan Sanken) selected for its very low internal resistance.

50V capacitors 10000uF complement the power stage.

Toroidal transformer

The power stage operates through a 300VA toroidal transformer with impressive size.

The latter is maintained on the casing by an anti-vibration stabilizer seal.

In order to prevent electromagnetic interference and noise that may affect the signal quality, the transformer is insulated from the rest of the circuit by the internal radiator.

Slightly noticeable noise from the toroidal transformer.

Cheap power amplifier toroidal transformer
Amp MOSFET, transistors, power

Power amplifier stage

The AB class power amplifying stage uses complementary transistors C5171 and A1930.

All elements of the power stage arevented and  mounted on a large radiator to dissipate heat efficiently and to gain power without degrading the sound / prematurely wear the equipment.

Parts supplied
Amplifier 2x120Wx1
TypeIntegrated amplifier
Volume ControlYes
Source selectorNot
Power2x 120W 4ohm
Frequency response10Hz - 40kHz
OutputsSpeaker cable socket
Power supply220V AC 50Hz
Dimensions190 x 70 x 311 mm
Weight5.3 kg
Power cableNot inclued
Data sheet
OutputSpeaker terminal
Channel2 (Stereo)
ClassClass A / AB
Amplifier chipC5171
Amplifier chipA1930
Power (W)120.0

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Average votes
4.8 / 5
27 reviews
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Date :
Improved version
It would be nice to be able to buy an improved version of this amp with better components so that I don't have to solder and throw away the replacement parts myself.
This review has been posted for AUDIOPHONICS MOS-120 Amplifier Class A/B 2x120W / 4 Ohm Black
Note :
Date :
Full-bodied sound
Honestly I wasn't expecting big performances, I was more intrigued by the peculiar circuitry of this little amplifier.

The workmanship is pleasant and substantial, and with the exception of a few sharp edges the quality of the materials is above all suspicion.

Like any amplifier of this type, the sound is full-bodied and well extended, with good dynamics and adequate damping which makes it not very sensitive to the types of speakers to which it is connected.

Very detailed in the mid-high range, with a great soundstage reconstruction and a bass that could appear to some as too controlled, it is excellent for those like me who prefer the classic jazz of C. Mingus, it gives great breath to the vocal pieces of D. Krall, and also gives Fripp's "pizzicati" that warmth and dimension that I usually find with SET and SEP amps.

As per description, the hum of the transformer becomes audible after an hour of listening but is very subdued, all in all in tune with the construction type.
Nothing to say about the silence of the circuit, however.
The amplifier is very quiet, even if you put your ear to the tweeter you can't hear any noises.

Definitely an EXCELLENT starting point for those who know and want to customize it, it represents a great investment for the asking price, and satisfaction is guaranteed.

My compliments go to the Audiophonics team for the quality of the transport box which is absolutely - flawless -.

The amplifier is enclosed in a solid polyurethane foam shell wrapped in expanded cardboard fillings, all enclosed in an external box whose solidity is guaranteed "courier proof"!

Thanks to the Team also for the speed in managing my order.
Have a good listening!
This review has been posted for AUDIOPHONICS MOS-120 Amplifier Class A/B 2x120W / 4 Ohm Black
Note :
Date :
pas ce que j'attendais
Tout d'abord... j'admets être un peu maniaque.
Je voulais remplacer mon ampli 70's par un ampli plus simple (pas de réglage aigu/grave/balance qui à mon sens n'ont rien à faire dans un ampli).
Le côté positif, le schéma électronique est TRES bien... c'est pour cela que je l'ai acheté.
Malheureusement le son n'arrive pas à la cheville de mon vieil ampli (HK505).
Je pense que les condensateurs ne suivent pas. J'aurais pu tout dé-souder et remplacer par des condos haut de gamme (MKT / Électrolytes) pour multiplier la qualité du son par 10... mais bon.
Le jour où il y aura une version 2.0 de cet ampli avec des condos haut de gamme je serai prêt à payer 100 Euro de plus avec grand plaisir.
This review has been posted for AUDIOPHONICS MOS-120 Amplifier Class A/B 2x120W / 4 Ohm Black
Note :
Date :
This little amplifier was an audiophile surprise for me. To say it in advance: it can definitely compete with amplifiers from the 1000€ league.
The first thing I noticed about the sound was the authority of the bass. It seemed as if my speakers were now supported by a very controlled subwoofer. Effortlessly and without strain, the MOS-120 controls the cones. This indicates a good damping factor. This sovereignty continues into the midband, which is wonderfully detailed and wide. The result is a spaciousness that I have never experienced with my speakers before. The high frequency range is accentuated and airy, giving the treble that typical audiophile melting. You can hear that this amplifier has a superior audio bandwidth.
The MOS-120 is a very good example of what makes a good analogue amplifier. It is puristic, but focuses on exactly what an amplifier must be able to do. I am considering ordering a second MOS-120 to use them channel separated. Unfortunately, my loudspeakers don't have a bi-wiring option and the MOS-120 can't be bridged, but this setup might give me even better channel separation.
This review has been posted for AUDIOPHONICS MOS-120 Amplifier Class A/B 2x120W / 4 Ohm Black
Note :
Date :
Bought to use with Denon 3700h avr as pre-out driver for front speakers. At first I experienced a ground loop between this and my htpc which was solved by using a cheap Amazon EU/UK power strip and a 2 pin EU power cable..then all good. I found the Denon to be very bright especially with music, this little beauty changed all that. A wonderful addition to the Denon AVR setup which drastically improved music but also (rather surprisingly to me) movie performance. The additional warmth and detail for both music and movies was very surprising. Anybody thinking of buying this kit, I highly recommend it especially if you are looking to use with a brighter home cinema amp like the Denon. This is my first adventure with pre-amping and I blindly took the leap of faith after reading the positive reviews here...hence my adding to them. Cheers.
This review has been posted for AUDIOPHONICS MOS-120 Amplifier Class A/B 2x120W / 4 Ohm Black

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