ALIENO 250 LTD
The first tube amplifier utilizing two 300Bs generating 250 Watts per channel.
is an OTL-OCL
(Output Transformer Less & Output Capacitor Less),
, pure Class A
a hybrid tube/transistor amplifier.
This innovative LTD "Loudspeaker Tube Direct" technology allows the use of
for amplification circuitry,
with transistors used exclusively
for power supply and protection circuits.
ALIENO is on permanent demonstration in Ravenna, at the certified listening room
Musica & Video of Maurizio Vecchi: www.musicandvideo.it
Our exclusive LTD
technology in ALIENO
was inspired by two primary factors in our study of tube amplifiers.
is the historical benefit of utilizing an OTL configuration over other traditional approaches.
Eliminating the output transformer from the signal path is extremely important.
It is in fact the most important component in the signal path where sound transparency is concerned.
In its absence, the true sound of tubes can be expressed in all their fullness.
In addition, some of the flaws generally attributed to tubes, such as slowness, lack of impact,
poor low frequency control, to a large extent are not caused by the tubes themselves,
but the output transformer.
Going through any output transformer, the signal undergoes two important transformations:
from an electrical signal it is converted into a magnetic field and subsequently
re-converted into an electrical signal.
After this double conversion, a degradation of the purity and immediacy of the sound is inevitable.
: Single Ended triode circuitry is renowned for its magical musicality, and notorious for
its lack of power. The ideal amplifier for purity and clarity should combine the positive qualities of
single-ended outputs with the elimination of an output transformer.
It should also have sufficient output power to drive any reasonable load.
These desires were our motivation for inventing the innovative circuitry of the LTD
Output power comes from the power tube, while supplies to the load, both voltage and current,
where the current is supported by our unique semiconductor power supply process.
With 250 Watts per channel and generous amounts of current, ALIENO
ensures authoritative control
of speakers in any dynamic range, precisely tracking complex impedance load demands even of
the most difficult to drive loudspeakers, allowing the full freedom to choose their typology.
technology differs profoundly from traditional circuits defined as ‘hybrid´,
which in addition to the output tubes, also include the use of transistors.
In a hybrid system, after voltage amplification by the tubes stages, the signal is then delivered
to the solid-state section for current amplification.
Two points must be underscored:
1) In hybrid designs, the tube is tasked with increasing the signal voltage only, but not its current;
this generates a partial, but important, loss of the tube signature on the sound.
This precious purity and tonal structure are the desirable aspects of single-ended sound
which must not be lost.
The "magic" of tube sound is thus only partially expressed in hybrid designs,
since only the voltage modulation supplied to the loudspeaker has those tubes qualities,
while the current supply adds the signature typical of transistors.
2) Moreover if we consider, that although quantitatively inadequate to the direct driving of a speaker,
the current supplied from a tube (not modified by the transformer´s interposition) is at its core
excellent for speed, impact and modulation, we put all our energy into preserving 100% of these virtues
and delivering them unchanged to the speaker connectors.
In addition to its sonic excellence, ALIENO
pays attention to technical performance too, both for
interfacing with the most difficult speakers, and in relation to its intrinsic stability and practicality of use.
With a damping factor that exceeds one hundred, and a managed output current of
approximately 200 Amperes, we have created an output power structure
enviable even for a transistor amplifier, let alone a single ended tube output stage.
All this with NO negative feedback.
Stability and user practicality of ALIENO
are assured through no required manual Bias regulation,
thanks to electronic circuit management of the KT150 tubes.
All parameters are constantly optimized over the entire operating life of the tubes.
In addition to the security and consistency of a system which is always perfectly fine-tuned
regardless of electrical grid conditions and power tube aging,
the control circuits allow "Tube Rolling" without worrying about Bias regulation.
Another significant advantage is found in the extended longevity of 300B power tubes,
which being little stressed, will last well beyond their typically rated five thousand hours.
300B dissipation is about 20W, half of the maximum expected by tube manufacturers.
Balances between various sections of the circuit are intrinsically managed and ensured through
active circuitry and precise passive components selected for their sonic purity.
No trimmers to adjust and no negative feedback, which is totally absent,
just the purity of the original tube sound.
Alieno 250 LTD specifications
: Vacuum Tube Stereo Power Amplifier, Pure Class A, Single Ended OTL-OCL
(Output Transformer Less & Output Capacitor Less), with proprietary LTD technology.
The acronym means: "Loudspeaker Tube Direct".
Tubes are used exclusively
for amplification circuitry
and solid state exclusively
for the power supply section.
No hybridization of tube and solid state technology.
Transistors are utilized for power regulation, stabilization, and safety circuitry ONLY.
No hybrid tube/transistor sound !
- Power Output: @ 3 Ohms - 250 Wrms continuous per channel.
- Distortion: typically 0,1%, max 0,5% from 20 to 20.000 Hz.
- Frequency Response: ± 0,5dB from 5 to 100.000 Hz.
- Internal bandwidth: > 1 MHz
- Gain: 22dB.
- Input sensitivity: 2,5 Vrms.
- Input impedance: 100 K ohms (irrelevant capacity).
- Input connectors: Rca and XLR.
- Optimal Load Impedance: 2 8 Ohm.
- Signal to Noise Ratio: > 100 dB.
- Damping Factor: > 100.
- Overall Negative Feedback: totally absent Negative Feedback.
- Slew Rate: > 300 Volts/microseconds.
- Output Current: > 100 Amps peak per channel.
- Tubes required per channel: one ECC82, pre-ampli and driver tube.
one KT150, stabilizer tube.
one 300B, output power tube.
- Tubes management: Constant optimization of all tube operating parameters,
including bias, over-voltage and over-current protection,
along with real-time output impedance management.
Auto adjustment of balance differences between each tube in the circuit.
Imprecisely matched tubes or individual tube lifecycle issues are wholly compensated by regulation circuits.
- Protection features: Thermal threshold independent for each channel.
One AC main fuse and five fuses on each power supply sector.
Protection for wrong connection between power supply unit and amplifier unit.
Double timer for a gradual loading of the charge on AC power grid.
Each protection has its independent warning led, including the fuses.
On/Off "thump" eliminated by delay relay transient protection.
Infallible loudspeaker protection circuitry.
- Dimensions (including cables plugs on rear panels):
Amplifier unit, cm. 45 x 50 x 28; inches 17,7" x 19,7" x 11" (W x D x H).
Power supply unit, cm. 45 x 60 x 27; inches 17,7" x 23,6" x 10,6" (W x D x H).
- Weight: 100 Kg net 220,4 lb.
ALIENO is distributed by Acustica Applicata Italy
The European premiere of the new prestigious Avalon SAGA took place on 23rd and 24th March 2018, at the certified room Musica and Video of Maurizio Vecchi in Ravenna, where they are now available for permanent listening.
Given the great appreciation and enthusiasm that animated both the expert directors and reviewers of HiFi magazines on the 23rd dedicated to them, and the audience of audiophiles present on Saturday 24, Acustica Applicata invites all the audiophiles who could not participate at the event, to reserve an appointment for a listening session to the following contacts:
Musica e Video di Maurizio Vecchi; firstname.lastname@example.org
, Phone: 0544 419138
Acustica Applicata; email@example.com
, Phone: 0583 730322
With the following links you can read the first reports of journalists present on the event, followed by those in the paper magazines: Fedeltà del Suono, AudiophileSound, Suono and Audio Gallery.
We remind you that for years the Music and Video show room has been certified by Acustica Applicata for the excellence of the acoustic treatment, a condition that allows the listener to evaluate the quality of the system in objective conditions, without the unwanted and heavy alterations in the time domain and frequency domain, typical of listening rooms with out-of-control acoustics. In this room of Acustica Applicata shows that even in a domestic environment, it is possible to 100% reveal and appreciate the quality of the reproduction system, especially when it comes to very high performance
like the one installed by Musica and Video.
At Musica and Video show room in Ravenna, Acustica Applicata
"Recognize Itself" and certifies that the listening quality is at the absolute top
of the stereo reproduction.
The in depth knowledge of the reality of the Italian and International market acquired by Acustica Applicata in over 25 years of activity, also allows us to testify that the commercial realities available to the public where you can see and listen a reproduction system and musical media at the maximum quality levels and rarity as by Musica and Video in Ravenna, is an extremely hard-to-find thing, even in countries where high fidelity has made and continues the Hi-End story. For Italian audiophiles, a "local" privilege envied by many fans all over the world.
For any audiophile, a listening session at the certified Musica and Video room, is an experience that is also very satisfying, even instructive, because regardless of the investment required, it makes the "State of the Art" of stereo reproduction accessible to the visitor, indicating however the correct way to build it and make it possible, avoiding to disperse resources in less essential aspects for the final result.
A listening session of the new Avalon Saga at Music and Video in Ravenna is a "Reference" .... for anyone owns an independent spirit, of mind and of soul, who wants to have very new and advanced listening experience,
in our opinion, diversely stimulating.
DaaD Mark II:
The remarkable Acustica Applicata classic renews itself.
Introduced in the year 2000, DaaDs are reborn in their new Mark II release with a redesigned internal construction for improved performance.
Throughout their sixteen years, thousands of DaaDs have been installed in the finest sounding rooms around the world. They are still the most versatile and efficient device for modern acoustic treatment in high fidelity listening environments where superlative system performance is demanded.
Aesthetically DaaD Mark II’s are identical to the original series; the important structural improvements are inside each DaaD Mark II model. The only visual difference is the new gold label, replacing the previous silver, and bearing the name Mark II on our classic oval.
After extensive in-depth research, we have replaced and reconfigured the original internal layers of acoustic material with innovative modern fibers. These materials are an exclusive progressive structure, the result of years of study into the microscopic infrastructure of synthetic fibers. Broad band absorption is even smoother than before, with an overall 20% increase in the efficiency of each DaaD II.
Increased efficiency means fewer devices are needed to achieve the same result while increasing the effectiveness of each DaaD II in its respective position within the room set up. This translates into lower average cost of each acoustic installation, while also achieving a more powerful result.
Our new internal materials are totally no-toxic, do not emit micro-particles into the air even after many years of use, and do not gradually yellow when exposed to direct sunlight. This insures both the long term functioning of our unique absorption/diffusion technology and the retention of each device’s cosmetic beauty.
With our new series of DaaD Mark II models, in addition to the tunable variable resonators Polifemo and Volcano, Acustica Applicata reinforces its supremacy as the most sophisticated and evolved range of products for acoustic treatment, specifically developed for high resolution playback in the home and recording studio.