Zenith Allegro Operating Manual & Warranty
INDEX
SETTING
UP FOR
OPERATION
TUNER/AMPLIFIER
CONTROLS
AND TUNING
REAR PANEL
CONNECTIONS
RECORD CHANGER ....
MAINTENANCE
TAPE PLAYER/RECORDER
MAINTENANCE
SPECIFICATIONS
HOW TO
USE ACCESSORIES
1
3
5-6
6-9
9-11
11-16
16-17
18-19
20
^\
NOTE:
The model
and serial
numbers of
your Zenith
Stereo
are located
on
the
back
of the cabinet.
For your
convenience
and
protection, please
record
these
numbers
in the
spaces provided
below
and
retain this booklet
for
future
reference.
Mode
Serial
No.N>>
SETTING
UP
FOR
OPERATION
Your
new
Zenith
Stereophonic
System
will
play two
channel
stereophonic
programs
and
any
conventional
monaural
program
material.
Following
are
a few
preliminary
instructions
to
ready
your
system for
operation.
Remove all
packing
materials.
Turn
the
base plate
mounting
bolts
on record
changer
(See Fig.
4)
clockwise
until
they
are
even
with the
base plate.
Remove
the
cardboard
strips from
either side
of record
changer,
if present.
Connect
the
AC line cord
into
a household
electrical
outlet (llO
to 125
Volts,
60
Hz AC).
The
unit is
now ready
for
operation.
Before
operating,
we
suggest
you first
glance
through
the
Operating
Guide to
obtain
a general
idea
of the
pur-
pose of the
various
controls
and
main
features.
However,
after
you have
become
familiar
with the
basic controls
please
be certain
you are
obtaining
the
full
benefit of
all
the
capabilities
engineered
into
your new
Zenith
Stereophonic
System, by
carefully
rereading
the
complete
Operating
Guide.
WARNINGS
PREVENT
FIRE
OR
SHOCK HAZARD.DO
NOT EXPOSE
THIS
APPLIANCE TO RAIN
OR
MOISTURE.
STEREO
INDICATOR
FM
MUTE
SWITCH
LOW
FILTER
SWITCH
HI
FILTER.
SWITCH
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STEREO
PHONO
TAPE
AUX.
i
BALANCE BASS
*
TREBLE
*
*
LOUDNESS
FUNCTION
•*
*
BALANCE
BASS
TREBLE
LOUDNESS
FUNCTION
CONTROL
CONTROL
CONTROL
CONTROL SELECTOR
TUNING
METER
TUNING
; :
FM-AFC
SWITCH
POWER
SWITCH
I
-
TUNER/
AMPLIFIER
SECTION-
CONTROLS AND
TUNING
(Fig.l)
ON/OFF
POWER
Switch
-
Move right
to turn
set on.
Move left
to turn
set off. (The
main unit
also will
turn
on
when the
Record
Changer
Mode
Selector
is
in the
START position
even
if the
main unit's
ON/OFF
POWER
Switch is in
the OFF
position.
However,
for playing
all functions
except
PHONO,
keep the
Record
Changer Mode
Selector in
the
STOP
position.)
FUNCTION
Selector
-
Move
(up or down) to
select
program
source.
In the
AM,
FM or FM
STEREO positions,
only
the tuner
(radio)
will operate.
In the TAPE
position
the built-in
tape unit
will be
connected for
playing
tapes.
Move to
the AUX
position
if
you want to play
external
accessories
(tape
decks, etc.).
In
PHONO, the
Record
Changer is
connected
for
playing
records.
The positions
of the
FUNCTION
Selector
(AM,
FM, FM
Stereo,
etc.) are individually
illuminated
as the
FUNCTION
Selector is moved.
They show
which function
is in
use and serve
as a
pilot
light.
Tone
Controls
-
This unit is
equipped
with special
boost/ cut
tone
controls.
BASS Control slides
up and
down
to
vary
in-
tensity
of the lower tones.
Slide towards
HI
to boost
(in-
crease)
bass; towards
LO
to cut
(decrease).
TREBLE
Control
slides
up and down
to
vary intensity
of higher tones.
Slide
towards
HI to
boost brilliance;
towards
LO to
cut. Response
of
both channels
of your
system is controlled
simultaneously
by these
controls.
LOUDNESS
Control
-
This unit
uses a
compensated
Volume
Control known
as
a LOUDNESS
Control.
It
automatically
boosts
high
and low
frequencies
for better quality
listen-
ing
at
low sound levels.
Both channels
are
adjusted
simultaneously.
BALANCE
Control
-
Controls the amount
of
sound output
from
left and right
speakers. To
balance
sound, set the unit
for AM or
FM
Monaural
operation;
adjust LOUDNESS
as
desired;
then slide
BALANCE
control
up or down
until the
sound
appears
to
come from
a
point midway
between
the
two
speakers.
Move towards
R for
more
sound
from
righthand
speaker;
towards L
for more
sound
from
left
speaker.
TUNING,
AM
Band
-
Set the
FUNCTION
Selector to
AM.
Rotate
the TUNING
Knob
slowly
until
the station that
you
desire
is tuned
in. Proper
tuning
is indicated
by greatest
movement
of pointer
to the
right on Tuning
Meter.
(See
"Tuning
Meter.")
Readjust
the Tone
and LOUDNESS
Controls
to your taste.
TUNING,
FM Band
-
Move
FUNCTION
Selector to FM
or FM
STEREO.
Move AFC
Switch
to
"Off" to attain
sharper tuning.
Rotate
the Tuning
Knob
slowly
until the
desired
station is
located.
A hissing
sound
may be noted
between
stations.
This
is normal
and will
disappear
as the station
is tuned in
(unless
station is
very weak),
Proper
tuning
is indicated
by
clearest
noise-free
sound and
proper reading
of Tuning
Meter.
(See
"Tuning
Meter"
and "FM MUTE"
Sections.)
Now
set AFC Switch
to
"On" to lock-in
station.
When
the
desired FM station
is a weak station,
adjacent
in
frequency
to a strong station,
the
AFC may pull
the tuning
into
the
stronger
station.
Under these
conditions,
leave
the
AFC switched
OFF.
Radio Dial
Scale
-
AM
Band
-
The AM scale is
calibrated
from
55
to
160. A
station
listed
as operating on
600
kHz, for
example,
will
be found
at
60 on the
dial
scale. A
station
listed at
1400 kHz
will be found at
140.
FM
Band
-
The
FM
dial
scale is
calibrated
from 88 to 108
MHz.
TUNING Meter
-
Shows proper tuning
on
AM
and
FM,
In
AM
operation,
proper tuning
is
shown
by greatest pointer
movement to
the
right. (Stronger
stations
produce
further
pointer movement.)
When
operating on FM,
you
are
properly
tuned
when the
pointer is
centered between
maximum
left and
right swings for the
station
you are tuning.
FM STEREO
Indicator Light
-
When
the FUNCTION Selector
is
set
to
FM
STEREO and
you tune to a stereo
FM broadcast,
the FM
STEREO
Light
will illuminate, indicating
the
tuner is
receiving
a stereophonic
program.
If
you
tune to
a
monaural FM
broadcast,
the FM
STEREO Light
will not
illuminate,
since the
tuner
is receiving
a monaural
program.
The Stereo
Indicator Light
will operate
only in the
FM STEREO
position
(NOT
in
the
FM position),
AFC
SWITCH
-
Automatic
Frequency
Control (Switch
located
on
front
panel)
keeps the receiver
on
the exact
station
frequency
when tuned
to
an FM
station.
See
,%
l UNING
-FM BAND" for details.
HI FILTER - Reduces
high
audio
frequencies
for
decreasing
the
noise
ordinarily
heard
with
"scratchy"
or
noisy
records
or
tapes
and
on
weak FM
stations.
LO
FILTER
-
Reduces
low
frequency
noise.
FM
MUTE
-
Cuts out
the
'hiss"
or noise
usually
heard
on the
FM
band
when tuning
between
stations.
Very
weak FM
stations
with
a high
noise
level
may
be
blanked
out
by
the
FM
MUTE
feature. If
the
station
you want
to
hear
is very
weak, simply
leave
the
FM
MUTE
Switch in the
OFF
position.
See
"TUNING-FM
Band"
for more FM
tuning
tips.
SPEAKER
JACKS
AND
SELECTOR
SWITCH
EXTENSION
SPEAKER
JACKS (Fig.
2A)
-
If your
room
will ac-
commodate
additional
speakers,
or if
you decide to
place
extension
speakers
in another
room,
Zenith
extension
speakers
Models
JIOOO,
J2000, or J3000
(8
ohm im-
pedance)
may
be
purchased
from
your dealer.
These
speakers
are
connected to the
Jacks
marked
EXT.
SPKR.
on the
back
of the stereo
cabinet.
HEADPHONE
JACK
(Fig.
2B)
-
Located
on inside
back
of
cabinet.
Plug in
headphones
here
for
private
listening.
See
section
on Speaker
Selector
Switch
for
details.
SPEAKER
SELECTOR
SWITCH
(Fig.
2B)
-
This
switch
located on
inside
back
of cabinet
controls
operation
of the built-in
speakers
and any
external
speakers
connected
to
your unit.
It
also
controls
headphone
operation.
o
EXT.
SPKR
O
L
O
Figure 2A
'../,.
=
In the
INT Position.
Place
the
switch
in the INT
position
for
stereo
sound through
the
built-in
speakers
of your stereo
cabinet. If
you have
connected
external
speakers
to
your
cabinet
they
wilt not
be operative
in this
mode.
If head-
phones are plugged
into
the
headphone
jack,
you will
receive
full
sound in your
headphones,
but no sound
through the
built in
or
external
speakers.
In
the
ALL Position.
Place
the switch
in
the
ALL
position
for
stereo
sound
through
the
built-in speakers
of
your
stereo
system,
and
from
any external
speakers
you may
have
con-
nected
to
the
cabinet. This is
ideal for
the
enjoyment
of
stereo
sound
in
more
than one room
at
a time.
If head-
phones
are plugged
info
the
headphone
jack,
you
will
HEADPHONE
SPEAKERS
o
INT ALL EXT
Figure 28
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receive
full
sound in
your
headphones
but no
sound
through
the
built-in
speakers
of your
stereo
cabinet
or external
speakers.
In the
EXT
Position.
Place the switch
in the EXT
position
for
stereo
sound
from
any external
speakers
you have
con-
nected to
your
stereo
cabinet.
The built-in
speakers in
your
cabinet
however,
will
not be operative
in this
mode. This
allows
for
enjoying
stereo
sound in
a room
other than
the
one
in which your
stereo cabinet
is kept.
If
headphones
are
plugged into
the headphone
jack,
you
will
receive
full sound
in your headphones,
full
sound from
the
external speakers
and
no sound from
the built-in
speakers
of the
stereo
cabinet.
AUXILiAR
JACKS
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ACCESSORY
JACKS AND
FM
ANTENNAS
AUX
INPUT,
TAPE INPUT
and TAPE
OUTPUT
JACKS
(Fig. 3)-
These jacks
allow you to
connect additional
accessories
to
expand
your
stereo system's
capabilities,
For
directions,
see
"HOW
TO
USE ACCESSORIES
WITH
YOUR ZENITH
STEREO
SYSTEM"
on
page 20.
FM
ANTENNA
Terminals
-
The
built-in
FM
Antenna
is
designed
for
FM reception
in
locations
where
fairly
strong
signals
are
received
from the
transmitting
station.
In
locations
where
reception
with the
built-in
antenna
is
marred
by noise
or
distortion
due
to weak
signals,
it
is im-
portant
that
an
external
FM antenna
be used.
Also,
in areas
of marginal
reception,
a better
antenna
may
be
needed
for
stereophonic
FM reception
than
for
conventional
FM. ANTENNA
CONNECTION
monophonic
FM. Zenith
Model
973-241A or
973-242
is recom-
mended.
To connect
the
lead-in from
the
external
FM antenna
to the
receiver,
first disconnect
the
built-in
antenna.
Connect
the
external
300 ohm antenna
lead-in
to the
FM ANTENNA
Ter-
minals.
RECORD
CHANGER
OPERATION
AUTOMATIC
RECORD
CHANGER
OPERATION
For
playing several
records
in
sequence (Fig.
4).
Be
sure
any tape
used
to secure the
Tone Arm is
removed and
the
Base
Plate
Mounting
Bolts
are
turned fully
clockwise
before
placing
the
changer
in
operation.
1. Move
the
main
unit's FUNCTION
Selector to
PHONO.
The
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