or to
monitor
the tape on a three-head recorder
during recording, place the
MONITOR
(TAPE/
SOURCE) pushswitch in the
"TAPE"
(in) posi-
tion.
During recording, the MODE Switch should be
in the DISCRETE,
VARI-MATRIX
or SO DE-
CODER positions. This applies the source signal
unchanged, directly
to
the tape outputs. '
To record a discrete 4-channel source on a 2-
channel recorder,
put
the MODE Switch in the
2 CH position.
Leave
the TAPE/SOURCE
button
in the SOURCE (out) position while recording.
This
will
feed the sum
of
the
left-front
and left-
rear inputs
to
the
left-front
TAPE
MONITOR
OUT jack, and the sum
of
the
right-front
and
right-rear inputs
to
the
right-front
TAPE MONI-
TOR
OUT
jack.
To record any type
of
source on a monaural
recorder,
put
the MODE Switch in
the
MONO
position.
Leave
the TAPE/SOURCE
button
in
the SOURCE (out) position while recording.
MAIN
AND
REMOTE SPKR SWITCHES
These switches select the loudspeaker terminals
to which audio power is fed. The
MAIN
and
REMOTE groups
of
loudspeakers may be operat-
ed separately or simultaneously. With both
speaker switches in the
"out"
position, all loud-
speakers
are disconnected. The signal at the
FRONT and REAR PHONES jacks is
not
affected
by the
MAIN
and REMOTE SPKR Switches.
NOTE: When using hoth
MAIN
and REMOTE
speakers
simultaneously, the combined
impedance
of
all the speakers should
not
be
less
than 4 Ohms.
POWER SWITCH
This pushswitch turns the Power on or
off.
When
the POWER Switch is
"in",
the dial lamp illumi-
nates. Be sure
to
turn
the POWER pushswitch
off
before plugging or unplugging the power cord.
FRONT
AND
REAR
PHONES
JACKS
These jacks accept a standard 3-conductor phone
plug employed
with
standard stereo or 4-channel
headphones. When using 2-channel headphones,
insert the plug
into
the
FRONT
PHONES jack.
When using 4-channel headphones, insert the
front
plug
into
the
FRONT
PHONES jack and
the rear plug
into
the
REAR
PHONES jack.
Either high- or low-impedance headphones may
be used.
LOUDNESS
When listening at
low
levels, set this switch
"in"
.
The LOUDNESS Switch boosts
bass
and treble
tones to compensate
for
the human ear's lack
of
response to those frequencies at
low
volume
levels.
HI
FILTER
SWITCH
With this pushswitch set
"in",
the High Fre-
quency Filter
suppresses
high frequency noise,
such
as
"scratch"
from
worn phonograph records
and tape "hiss". The
filter
will
also slightly
reduce high frequencies in the program material.
When the program does
not
have high frequency
noise, the HI
FILTER
pushswitch should be
"out"
.
TUNING
METER
The Model 4270 is equipped
with
two
meters,
a SIGNAL-STRENGTH Meter and anFM
TUNING
Meter. The SIGNAL-STRENGTH Meter indicates
the signal-strength
of
any AM or FM broadcast.
The FM
TUNING
Meter operates on
FIVI
only
and
indicates correct station tuning. The
SIGNAL-
STRENGTH Meter acts
as
a Dolby Calibration
Meter when the
DOLBY
Switch is in any position
other than
"OFF".
TUNING
AM:
For
optimum
AM
reception, tune to the
desired station. Then, rock the
TUNING
knob
slightly back and
forth
until
the maximum
reading is obtained on the SIGNAL-STRENGTH
Meter. The FM
TUNING
Meter is
not
used
for
AM.
FM: Set
the
SELECTOR Switch to
"FM"
and
tune to the desired station. Then, slowly rock
the
TUNING
knob back and
forth
until
the FM
TUNING
Meter points to the center scale posi-
tion.
,.--
- - -
--
LEFT CHANNEL
COM MON
L..-.----RIGH
T
CHAN
NEL
Figure
10. Stereophone
Plug
9
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