Marantz 2245 Instruction Handbook Manual page 18

selectively
to
the desired source.
TAPE SIGNALS
With the
exception
o{ tape input, all
high
leve
inputs are {ed directly
to
the s€lector switch.
Tape
input is routed through the front
panel
dubbing lN
jack
to
a
section
of the TAPE MONIToR
switch.
The dubbinq
lN
jack is
a three conductor
stereo
jack which
has
two built_in switches, one
for
each
channel. Normally, these switches
are
closed,
a!lowing the tape input
signals
from the TAPE lN
jack on the
rear panel
to
be fed
to
the
TAPE
IMONITOR switch. When
a plug
is inserted
in
the
dubbing
lN
jack,
the
switches
are
opened,
disconnectinq
the TAPE lN jacks and ällowing the
signal
from
the
dubbing IN jack
to
reach
the TAPE
IMONITOR
switch. Thus
only
one tape recorder at
a time
can feed playback
signals
inlo the
l\,4odel
2245.
TAPE IV]ONITOR SWITCH
When rhe TAPE MONITOR pushswitch
is in
the
"out"
position tape input
signals
from the
TAPE
lN
jacks
on the rear panel
or dubbinq lN
jack
on
the
front
panel
are
fed
to the selector switch.
When
the TAPE MONITOR is
depressed,
the
output of
the
selector
switch
is
disconnected
lrom
the
balance
control
and
the tape
input
signais
from the
TAPE
lN or
dubbing
lN
jacks feed
the
balance
control
directlV.
0dB
PHONO SIGNALS
Phono siqnals
of
up
to
100 millivolts can
be
handled
without overloading
The RIAA
equal
ization nelwork provides precise equalization and
sets
the voltage gain
of
the phono prearnplifier to
4OdB
(at 1,000H2). Thls
R
IAA reprodLtcing charac
rerisric, IoqerhFr
will
I\e
recordinq
chaldcler'slic,
is shown
in
FigurelO. Notice
that the net
resuit
after playback
is
a
flat
response.
MONO
FUNCT IONS
When
the
N4ONO
pushswitch
is in the "in"
position, the
lwo
channels are
connected together
through mixinq
resistors.
ln addition, the lefl
and
right channel tape input
signals are
connected
10
qether throLrgh
a
similar resistor
network
This
facility
allows
all
inputs
to
be converted
to
the
monophon;c
mode.
CONTROL CIRCUITS
The control circuits portion
of
the
l\,'lodel 2245
consists
of the
balance,
volume,
bass,
mid, treble,
Hi
FILTER; and LOW FILTEB controls.
All
controls
affect
the left
and riqht
channels
simultaneouslv.
The
bass.
mid
and
treble conlrols
have clutched sectlons
which allow
individual
adjustment
of
tonal
balance
for
each
channel Wilh
the
controls set
for flat
response
and
volume
Fiqurel
0. Phono
Equalization
Characteristics
J
J
l
2AHz
100H2
lKHz
10K
Hz