I found it hard to believe - when I was preparing the materials for the test that you read, I searched for Fezz Audio amplifiers that I conducted. It turned out that they were only two devices, models Silver Luna and Titania . And it seemed to me that I knew the sound inside out, I have it in my head and ears. And I have, I know very well how Fezz Audio amplifiers play, because I have traveled all workshops last year, during which half of the listening sessions were carried out with the Titania model
α Lupi
Already during the mentioned conversation, Maciek told me that he would like Lupi to appeal to young music lovers, music fans, crazy guests, for whom the electron tube is an important symbol. In addition to the low price, it had to be as versatile as possible, and the presence of a headphone output is one of the most important functionalities of modern sound sources, both DACs and amplifiers. I thought then that it was a great idea, how natural. However, it proved impossible to implement. For the amplifier to be made at a level that people at Fezz Audio could accept to sound good, its price would have to be higher than expected. Maciek regretfully, but still had to put the project back on the shelf, opting for a classic integrated amplifier. And he was right. As the exhibition in Korea showed and the first orders resulting from it, the amplifier was accepted as it was. Even then it was called α Lupi (alpha). The way out of the situation was to complement it, an amplifier designed only for headphones, the Ω Lupi (omega) model.
The genesis of this model is associated with the research that was carried out on the prototype of the original Lupi, with a headphone output. It turned out that this particular system, these specific tubes cooperating with toroidal output transformers are ideal for powering the headphones. So the idea was dusted off and in this way the amplifier that was the hero of this test was created. From the outside, both amplifiers - Alpha and Omega - are almost identical. These are simple, sophisticated forms in burgundy and black, with aluminum inclusions of manipulators and logo and white typography. The front is varnished to a high gloss, and the other walls are powder-coated. The part covering the transformers is black.
The device has two knobs - changes in volume and output impedance, so you can adjust it to your headphones. There are three positions to choose from: "Low", "Mid" and "High". The system is based on push-pull topology, but there are only four lamps - why? Maciek reached because the very popular, and thus inexpensive, cool PCL86 lamp. These are two lamps in one bulb - a triode and a pentode, and this model was used in television sets. Its ECL86 version, i.e. with a lower filament voltage, was in turn found in the amplifiers of Polish Fonika and Unitra. Suffice it to say that I made my first tube amplifier by pulling and extending the ends from a turntable with the Stereo 240 amplifier, and I built the preamplifier on the ECC83 tube, using a simple system found in the book An Audio Approach To Audio Frequency Amplifier Design , published by The General Electric co Ltd. of England from 1957.
In the Fezz Audio amplifier, the gain path is shorter, because one of the triodes in PCL86 is used to reverse the phase, and the other is a control lamp - the potentiometer is in front of the system. Let us add that the lamps used here were produced in the Polish factory Polamp. It is a pity that the Russians and Czechs were able to use the machines and skills of people and their lamps are known today all over the world, and Polish have gone down in history ... But such life - it's great that someone reminded them and in such an interesting amplifier.
MACIEJ LACHOWSKI Owner, designer
That is why, right after the exhibition, we started work from the beginning. Of this prototype, only reconstruction remains. Everything inside has been rebuilt from scratch. As you well know, the heart of every tube amplifier is not only tubes but above all transformers and we spent the most time on their construction. But it's probably obvious - Toroidy.pl are a strong player on the audio transformer market and we have unique experience with various types of constructions. Omega Lupi is a one-of-a-kind amplifier. Most headphone tube amplifiers are OTL constructions - i.e. without output transformers. And I wanted the headphones to be treated as a speaker set in our design, because what else, if not good speakers, are headphones?
The only way to achieve this is to match their impedance by transformers - i.e. just like in an integrated stereo tube amplifier. Therefore, we have designed windings in transformers to optimally match headphones with low (up to 32 Ω), medium (up to 300 Ω) and high (up to 600 Ω) impedance. Thanks to this procedure, we have achieved optimal working conditions of the headphone transducers, and thus negligibly low distortion and great dynamics while maintaining the tube character of the sound. Omega Lupi is a very efficient current amplifier. During the construction works, we tested about 30 pairs of headphones - starting from the simplest dynamic ones, through studio studios up to several hundred meters, and ending with planar Audeze models. In no case did the "pair" run out. At this point, the question is: why PCL86 lamps? One of the reasons is historical - it is on them that we built our first tube amplifier called Laura (still as Toroidy.pl), which captivated many listeners.
The second reason is personal - I value this lamp very much. Considering its price, availability, sound and origin (POLAMP Nakło) we couldn't deny ourselves the pleasure of constructing an amplifier using just the "bubble" PCL86. This is an outstanding engineering construction, very technologically advanced (two lamps in one glass) triode-pentode. It's a pity that at the moment nobody produces them. Fortunately, due to the wide availability of NOS lamps (they were very popular TV lamps after all) they are easy to buy at very low prices. Fezz Audio is based on the NOS of the Polish company Polamp, which are still available on the market and I believe that one day they will come back as new lamps. I would like to draw attention to the restrictive selection of lamps and exceptional attention to assembly. It is about extremely demanding sound aspects - after all, according to the design assumptions, this is an over-ear speaker system. So we put the ear in the column and there must be absolute silence, black background, zero brum, no hum - just silence.The Fezz Audio Ω Lupi amplifier was tested in the "High Fidelity" reference system and was compared to the Ayon Audio HA-3 amplifier. The signal was sent to him from the Ayon Audio CD-35 HF SACD player with the Acoustic Revive RCA-1.0 Absolute-FM and Crystal Cable Absolute Dream interconnects. It was powered by the Acoustic Revive Power Reference Triple-C cable.
The listening session was conducted primarily with HiFiMAN HE-1000 V2 planar headphones (nominal impedance: 35 Ω | efficiency: 93 dB), in the "Mid" position of the output impedance switch. What's interesting, because the nominal impedance of this model would suggest switching to the "Low" position. So it's worth trying out all three positions each time and choosing the best one yourself. Additional listening was performed with planar HiFiMAN HE-6 headphones (impedance: 38 Ω | efficiency: 89 dB) and dynamic Sennheiser HD800 (impedance: 300 Ω | efficiency: 102 dB) and Beyerdynamic DT-990 Pro (impedance: 600 Ω | efficiency : 97 dB). The sound of any audio product, and therefore also of this amplifier, can be assessed from two points of view - as a representative of a specific price category and in absolute categories.
Fezz Audio Omega Lupi sweeps in both. It is a device that looks and plays like amplifiers for 5000-6000 PLN and more. Although it is not an ideal amplifier, it does not even claim this role, it has everything you need to become the basis of any, really any system based on headphones. Its sound is modeled - modeled so that it is deep and saturated and that the bass is an important part of the creation, not just the low frequency erzatz, as is usually the case with headphone amplifiers. Modeling goes in the direction of smoothing the top and shifting the focus, focusing our attention on the low center. It gives something that we call "groov" or "walking bass".
As I said, the sound of Omega Lupi is incredibly "wide", it has momentum. It could therefore be assumed that the message would be distanced. But it is not. It is direct, and this directness results from the outstanding speed at which the sound is reproduced and from its density, which is delivered to us immediately, does not split at the seams. Compared to the most expensive headphone amplifiers that I know and have, the Polish device is less resolved and does not go deep into the sound of the instruments, like - for example HA-3 Ayon Audio. It builds sound rather on the axis and this is where the momentum window I was talking about opens, while Ayon and Octave V16 Single Ended also open the space on the sides. Or maybe it is different, maybe it is so that Fezz Audio showed more precisely the differences in this respect between different realizations? Can be also this way. But the impression remains just that the Fezz Audio amplifier sounds with a stronger, more emphatic center of the stage.
Summary
Ω Lupi sounds sensational. It plays with low sound, saturated colors and panache. Boosts the bass and shapes it, without ultimate control at the bottom. This does not bother you too much - and even if you do not compare it with something significantly more expensive, about three or four times. The resolution is very good, really fantastic and only single-ended constructions on good tubes go even further. But for this money? Just a burgundy sensation that deserves a mention:
BURGUND Fingerprint :)
Outside The Lupi Ω amplifier looks like a classic integrated amplifier. It is a flat main body with electronics inside and lamps on the top and a higher screen at the back hiding the output transformers. Transformers are manufactured by the company toroidy.pl, from which Fezz Audio is derived. Constructors can therefore design them exactly for the given construction. The power transformer and the choke are also made on their own - both on the toroidal core. On the front panel we have two silver knobs - volume and output impedance changes. The power switch is on the back, which is not quite comfortable. The lamps used in this project are PCL86 triodes - pentodes resembling popular EL84 pentodes from the outside. They work in a push-pull system in the AB class. The screen behind them has a beveled front, which makes it look lighter than usual. The part with lamps can be covered with a protective mesh, with which - it's rare - Ω Lupi looks as nice as without it.Technical data (according to manufacturer)
System type: push-pull, class AB1
Bias setting method: automatic
Output power: 2 x 250 mW
Load impedance: 32-600 Ω
THD distortion: <0.3%
Frequency range: 20 Hz-120 kHz (-3 dB)
Consumption power: 90 W
Fuse: 3.15 A
Dimensions (W x H x D): 340 x 355 x 150 mm
Weight: 9.5 kg
Πληροφοριες και τιμες εδω :
https://www.chameleonracks.gr/Fezz%20audio%20amplifiers/Fezz-Audio---Omega-Lupi-en