Magenta ACRH-2.6 Instructions Manual - page 6
Congratulation!
The ACRH-2.6 is an integrated and complete stereo
amplification and preamplification system. It offers the
features of a high-end unit designed in a user-friendly,
convenient, easy to use system. Its tube-based
preamplifier offers outstanding detail in sound and scope.
This, along with its semiconductor output stage, creates a
musically dazzling performance.
It is well known that a good preamplifier is the heart of a
sound system. With this in mind, Margules Audio fronted
challenge of developing a hybrid integrated amplifier
combining an extraordinary tube preamplifier with
excellent solid state amplifier.
The new ACRH-2.6 includes a fully discrete mm basic
phono stage that will allow you to enjoy your vinyl.
DESCRIPTION
Preamplifier
The preamp section of the unit is based on two dual
triodes (12AU7) per side that acts as coupling circuit from
the signal source to the power amplifier. The circuit is
based on the knowledge and experience gained in the
development of the acclaimed Margules SF220 line
stage.
This topology allows the frequency response to be further
wider than the audio bandwidth, maintaining the fase and
amplitude constant with a very low distortion together with
an extremely fast transient response.
The totally discrete phono stage is a high end
performance device with a RIAA curve EQ and enough
gain for a moving magnet, the input Z is 47kohms.
High Voltage Power supply
The Bias power supply of the preamplifier is fully
regulated. Good regulation reduces the loss of signal
integrity.
The filament supply is also regulated and has active
damping control to avoid noise and microphonics.
Remote operation
The remote control is unusually versatile. Besides the
input selection, volume, power on and off, you will also be
capable of switching the AC power of any associated
equipment having load up to 15 amps (1800 watts).
Additionally switching control can be accomplished by
means of the RS232 connection or with an external web
server (optional).
All switching is made by mechanical high quality relays
avoiding the audio signal to go through semiconductor
device, thus ensuring maximum signal purity.
Amplifier Section
The totally discrete semiconductor amplifier has direct
coupling topology, designed so that the entire inter-stage
is direct, avoiding capacitors, resulting in a faster
transient and lower distortion.
The output stage bias is designed with a proprietary
circuit optimizer that affects the operating point of the
semiconductor, solving the typical overheating found in