Simaudio 740P Preamplifier - Manual (Page 6)

740P Dual-Mono Preamplifier
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6
Introduction
Thank you for selecting the MOON 740P Dual-
Mono preamplifier as a part of your music/cinema
system. This preamplifier has been designed to offer
state-of-the-art high-end performance in an elegant
package, while retaining all the sonic hallmarks on
which Simaudio has made its reputation. We have
spared no effort to ensure that it is amongst the
finest two-channel preamplifier available. We have
been building high-performance audio equipment for
over 30 years, and the know-how gained through
our cumulative experience is an important reason
why MOON preamplifiers are so musically
satisfying.
Your new preamplifier is a true dual-mono design,
whereby each channel operates completely
independent of the other. The performance of your
740P will continue to improve during the first 400
hours of listening. This is the result of a “break-in”
period required for the numerous high quality
electronic parts used throughout this preamplifier.
Before setting up your new MOON 740P, we
encourage you to please read this manual
thoroughly to properly acquaint yourself with its
features. We hope you enjoy listening to the
MOON 740P dual-mono preamplifier as much as
the pride we have taken in creating this fine audio
product. We understand the power and emotion of
music and build our products with the goal of
faithfully capturing these elusive qualities.
The information contained in this manual is subject
to change without notice. The most current version
of this manual is available on our official website at
www.simaudio.com
Your MOON 740P dual-mono preamplifier incorporates many significant design features to achieve its “world-
class” level of performance. This is an abbreviated list of the more important features:
An oversized dual-mono power supply using 2
toroidal transformers in conjunction with 5 stages of DC
voltage regulation and extensive choke filtering.
4 stages of our newly developed M-LoVo MOON low
voltage DC regulation circuit; a highly sophisticated
circuit made up of a clever combination of IC’s and
discrete parts that is virtually free of noise, yielding an
exceptionally fast, precise, and stable DC voltage. The
result is a power supply with a virtually unmeasureable
noise floor.
SimLink controller port allows for 2-way communications
between other compatible MOON Evolution Series
components.
M-eVOL2 volume control circuit using MDAC’s (operating
in a current steering R-2R configuration) which alter the
audio signal’s amplitude and yield no sonic degradation of
the signal regardless of the selected volume setting.
530 individual volume steps in 1dB and 0.1dB
increments.
M-Lock circuit for “user selectable” maximum volume
setting lock-out for each line input.
Power supply voltage regulation includes i 2 DCf
(Independent Inductive DC Filtering); 1 inductor for each
and every IC in the audio circuit’s signal path – 24 stages
in all.
Full unsolicited RS-232 bidirectional feedback.
Gain offset for each line input with a ±10dB range.
Each line input is fully configurable to be “home theater
ready”, where the volume control of the 740P is
bypassed.
Four-layer PCB tracings; The advantages include better
ground and power supply circuit layouts resulting in a
much shorter signal path and dramatically improved
signal-to-noise ratio.
Optional external power supply.
Ultra rigid chassis construction to minimize the effects
of external vibrations.