Audio Analogue(오디오아날로그) Maestro Anniversary 인티앰프
www.kingsound.co.kr
이태리
생산, 500W*2ch, 2옴, AIRTECH, 31 Kg
Maestro Anniversary was born in AIRTECH's laboratories following to the
experience gained with the development of Puccini Anniversary. The basic scheme
is very similar, but with one important difference: the amplification chain is
fully balanced from the input to the power stage which becomes unbalanced to
connect to the speakers. This took to a doubling of amplifier stages and
attenuation. Also in the Maestro Anniversary all stages are without global
feedback. The feedback is not even used on preamp stage(as in Puccini). The
output power was increased to 150W on 8Ω with the consequent adjustment of all
the driver and power stages that now use four pairs of transistors per channel.
The basic configuration remains inverted cascode that is comparable to a single
gain stage followed by the output buffer. The stability of the working point is
maintained through a DC Servo that begins to work only at frequencies below a
few tenths of Hertz (then totally out of the audio band). Thanks to a so refined
circuitry, along with the selection of components of the highest level (military
standard resistors, polypropylene audiograde capacitors custom made for AIRTECH,
internal wiring with 7N OCC copper and pure copper output connectors) helped to
create an amplifier that has the honor of being the heir of the glorious Maestro
Integrated and therefore fully joins the Anniversary line celebrating at the
same time, the first 20 years of Audio Analogue, but also 15 years by the
introduction of AUDIO ANALOGUE's first product to bear the Maestro name. The new
Maestro Anniversary is a unique amplifier, its remarkable power that always
doubles with decreasing impedance and its extraordinary driving skills, are
accompanied by a unique musicality and refinement not common for so “muscular”
amps. Unfortunately it is not easy to express in words all its peculiarities and
therefore we invite you to listen to it as soon as possible and can only confirm
that now more than ever MUSICA MAESTRO!!!
The amplifier is fully thought of as composed of three separate elements. 1.
Power. It 'made with a 600VA transformer for each channel. The rectifier bridge
is realized with discrete diodes ultrafast 50A each. The filtering capacity is
16800μF by branch so the amplifier has a total filter of 67200μF. At the
switching on, the inrush current is limited by resistors variable with the
temperatures that after the powering are excluded from the signal path. 2.
Amplifier. There are two amplifiers (right channel and left channel) totally
separated each another both as ground, as power supply stages connections. They
have no common link. Even the digital commands for the control of volume chip
are optically isolated. It's real a dual mono configuration. The copper
footprints of the PCB have a double thickness compared to the standard to ensure
the passage of large currents involved. The routing of the PCB has long been
studied to optimize the signal paths and maintain the symmetry of the stages. 3.
Preamplifier. Just like the power amp circuits also preamplifiers are dual mono.
Immediately behind the input connectors there are relays for the channels
switching followed by a discrete components buffer, to isolate the amplifier
from the source. The maximum acceptable input voltage is approximately of 6VRMS.
The buffers, both balanced as for the inputs as for the outputs, ranging for
driving in class A the four(for each channel) volume chips. The latter, as in
the case of the Puccini are simply strings of resistors without any operational
inside them. This choice was made to not have any kind of global feedback within
the Maestro. After the volume control stage we have the real preamp that
amplifies up to about 12dB. The three elements described above are physically
housed on three separate boards so it's like having a power supply, a
preamplifier and a separate power amp.
