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GEN
ERA
L D
ESCRIPTION
Your
Marantz Model
4270
is a high-quality Stereo
2 + Quadradial 4 Receiver developed
by
Marantz,
a name famous
for
quality
in
the
audio com-
ponent industry. The Model
4270
incorporates
Marantz' exclusive
Vari-Matrix
circuit
which
sim-
ulates 4-channel sound
from
normal 2-channel
stereo programs, and is capable
of
reproducing
4-channel sound
from
any matrix-encoded source.
The
4270
will
also reproduce any discrete 4-
channel program as well as regular stereo and
monaural programs. An optional plug-in decoder
adapts the
4270
for
any specific
matrix
system
such as Columbia's SQ.
The FM
tuner
section employs an FET
for
the
RF amp and
Mixer
stage.
The IF
tuning
circuit
employs ceramic filters
of
wide
bandwidth
and
high selectivity
to
provide high sensitivity and
unparalleled interference-free operation. The
4270
incorporates a switchable 2-channel
DOLBY
system
to
reduce noise, inherent in recording
music
from
records, tape, FM broadcasts and
TV.
The FM
multiplex
circuitry
includes a phase locked
loop
Stereo-Monaural
Automatic
switching
circuit,
stereo
indicator
circuit
and a
buffer
amplifier
to
obtain
output
at
low
impedance.
Low
pass
filters
for
19KHz
and
38KHz
rejection are incorporated.
Moreover,
the
Model
4270
unit
has a
muting
cir-
cuit
that
permits pleasant FM broadcast reception
by completely eliminating inter-station inter-
ference which is usually generated at
the
time
of
selecting FM stations.
FORE
WO
RD
To obtain
opt
imum
performance and
enjoyment
from
the Model 4270, please study these instruc-
tions carefully.
Follow
the step-by-step instruc-
tions
to
obtain
maximum
performance.
The manual is divided
into
two
parts. The
first
covers installation and operation in simple, non-
technical language. The second describes the
Model 4270 in more detail
with
technical specifi-
cations and
functional
explanations.
For
quick
identification
of
the controls and
connections, references are printed in bold face
type.
AFT
ER
UNPAC
KI
NG
It
is advisable
to
save
all original packing material
to
prevent damage shouId you wish
to
transport
or ship the Receiver (refer
to
Figure 15
for
pack-
ing instructions).
Please
inspect
your
Model
4270
carefully
for
any signs
of
damage in transit.
It
has undergone stringent
quality
control
inspec-
tion
and tests
prior
to
packing, and
left
the
factory
in perfect operating
condition
.
If
the
unit
is damaged,
notify
the carrier
without
delay.
Only
the consignee may
institute
a claim
with
the carrier
for
damage during shipment. How-
ever, the Marantz Company
will
co-operate
fully
in such an event. Save
the
damaged carton as
evidence
for
inspection by the carrier.
5


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