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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
18


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