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SOLITAIRE

ELEKTRONIKK - Forsterkere, CD spillere, DACer mm... / / METAXAS & SINS
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[ Nye METAXAS: METAXAS & SINS ]

Info
SOLITAIRE - enda et spektakulært design fra Kostas Metaxas

The Solitaire is a straight 150WRMS Stereo Power Amplifier or can be offered like the IKARUS as a higher powered [150WRMS]
Stereo Integrated Amplifier.
It best embodies the sculptural design and “lack-of-sound” philosophy of Metaxas & Sins.
After over 35 years of work in the fi eld of High End Audio, from the design and manufacturing of entire playback systems to the recording
of over 300 acoustic concerts to gain further musical insights, the last thing that artist-designer Kostas Metaxas wanted to produce
was “another box with transistors on a heatsink”.
Kostas was dreaming of the most spectacular architecture, design and sculpture he had experienced and wanted to bring that
emotional intensity, daring and seductive beauty to an audio amplifier.

As a recording engineer, Metaxas also wanted to “voice it” for extremely realistic recording playback, to be able to reproduce all
the nuance and emotion of a musical performance.
His new SOLITAIRE is the result. Machined from a solid block of either aircraft aluminium, copper or titanium, it’s totally bespoke and the modular electronics make it future-proof. Even the circuit boards can be CNC machined from 1mm solid silver coated clear polystyrene.
From the sensual, organic and striking casework [inspired by the stunning work in Sports cars of the 1950’s/60’s of Ercole Spada, as
well as the architecture of Hadid, Gehry and Calatrava] to absolutely every part of the amplifi er including the circuit, topology, layout and
casework has been developed by Kostas Metaxas. It is the logical evolution of his groundbreaking design concepts pioneered in the
early 1980’s.
Then, it true “Bugatti fashion”, each and every amplifier is assembled by the master or his sins — either Andreas or Alessandros Metaxas.
The individually 5-axis CNC’d “sculptural” enclosure presents a very heavy, solid, inert, non-resonant structure to RFI shield and
ultimately protect the delicate electronic signals, driving the noise floor to ultra-ultra-low levels, revealing a wealth of detail that has
never been heard before.

1. INPUT STAGE:
The fully complementary, dual differential, cascaded input stage is linearised to ensure least distortion over the large voltage swings to the amplifier input from the preceeding preamplifier. A very gradual (6dB/octave) Bessel filter is incorporated at the input to eliminate the needless reproduction of Radio Frequencies.
The second voltage gain stage uses considerable local feedback to ensure that large voltage swings from the input stage are accommodated with the least possible distortion.
An overall negative feedback of only 11dB is required to stabilise the
complete D.C. operating point and reduce distortion at full power to below 0.01% T.H.D. which is primarily composed of second
harmonics. A D.C. servo is built around an integrated circuit to monitor the output voltage and ensure absolute D.C. stability.

2. OUTPUT STAGE:
Our triple Darlington output stage uses the fastest power transistors we could source, but sadly no longer available since the factory in
Japan was destroyed by a Tsunami. Fortunately, we purchased large stocks of these devices 30 years ago.
Our printed circuit design borrows techniques from RF and UHF groundplane technology to maximise the speed of current delivery,
especially at high frequencies.

3. POWER SUPPLY INPUT & OUTPUT STAGE:
The input voltage gain stage of the SOLITAIRE is isolated via the high-current output stage via a two stage’capacity-multiplier’ circuit which uses the beta of the transistors to multiply the filtering effect of the capacitor used. The simplicity of this circuit eliminates an output bypassing capacitors which would otherwise reduce the apparent speed and degrade the sound quality of this amplifier.

4. PROTECTION CIRCUITS: To eliminate the sonic colourations imposed by sophisticated current limiting protection circuits, the
SOLITAIRE uses only the short M205 fuse types to protect the high current stages. Apart from the fuses, a four pole relay is in series with the solid silver binding posts. If over 0.6VDC is sensed at the amplifier output, the relay is activated until the condition is rectified.

Specifications
FREQUENCYRESPONSE : DC - 5.0MHz (-3dB)
POWER OUTPUT: 150WRMS per channel into 8 Ohms
with no more than 0.05% T.H.D.
DAMPING FACTOR : Greater than 500 wide band
SLEW RATE : Greater than 1000V/us small and large signal
T.H.D. : Less than 0.05% 20Hz-20KHz
I.M.D. (S.M.P.T.E.) : Less than 0.05%
SIGNAL/NOISE : -117DBV unweighed input shorted
SENSITIVITY: 0.5VRMS in for 150WRMS out (28dB)
INPUT IMPEDANCE : 100kOhms in parallel with 11pF

What the critics said in the past...
Listener A “There is not much else to say except that the SOLITAIRE leaves far behind our best references”.
Listener B “ Let’s get straight to the point; MAS electronics are more than surprising, they are a real discovery, a rare fi nd. Rarely have we heard on transistor units such liquidity, such an ease of reproduction where voices once again fi nd melody and softness’
Jean Hirage/Patrick Vercher LA NOUVELLE REVUE DU SON, France.

“ The Solitaire is yet another solid state amplifier that I liked from the first time I heard
it in my system. It passed very musical and unharsh sounds through to the speakers.
Its sound is characterised by exquisite spatial presentations, solid dynamics, great
transparency and a tonality that is a little soft sounding in the high frequencies. This amp is lyrical and quick sounding.
A Bascom H. King thumbs up for this one!”
Bascom King, AUDIO USA


“ This amplifier, once it stops pouting and stamping its feet, has definition, transparency, clarity and solidity which will charm the pants o anyone who regards imaging and detail retrieval as paramount”.
Ken Kessler, HI FI NEWS &RECORD REVIEW, England.

“ The Solitaire is more impurtable, more steady, more precise and subsonically more tremendous than any SUMO power station of mulitple power output. Furthermore, the Solitaire isn’t picky at all with speaker principles. A complex dynamic 4 way speaker like Infinity Kappa 8, it brings the amp to top performance as do the extremely di cult electrostatic speakers of Putz or the old Martin Logan CLS. The real astonishment is met, however if one connects against all odds, the Metaxas power amp with the brilliant 300DM loudspeaker like the Energy Point 1E. Then the
Canadian shoe box sounds immediately like a noble speaker of ten times the price, surprises with bass extension, midrange resolution, transparency and easiness of treble ... “
Ulrich Michalik HI FI EXCLUSIV, Germany.




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