OPERATING INSTRUCTIONS
AM/FM STEREO TUNER AMPLIFIER
SANSUI 350
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SANSUI ELECTRIC COMPANY LIMITED
In selecting the Sansui 350 AM/FM Multiplex Stereo Tuner
Amplifier, you have made a wise choice, one that will offer you
years of quality stereo enjoyment.
Like all Sansui products, the 350 combines the finest in internal
engineering, performance and design. It has been precision built,
tested and re-tested to perform flawlessly within the limits of its
specifications,
This manual has been prepared to help you keep the 350 in per-
fect operating conditions. It explains all of the 350’s unique fea-
tures, installation and playing procedures, as well as some basic
maintenance requirements.
Please read the contents of this manual carefully before operating
the receiver. You will then be better prepared to hear the 350
perform up to its full capabilities.
CONTENTS
SWITCHES AND CONTROLS cc ccnnn 3, 4, 5, 6
OPERATIONS
SPEAKER CONNECTIONS/RECORD PLAYING ........ 7,8
RADIO RECEPTIONS «toe r 9,10
TAPE PLAYBACK/TAPE RECORDING ................ 11,12
MAINTENANCE -......... ear 13, 14, 15, 16
SPECIFICATIONS/CHARACTERISTICS.................. 17,18
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SWITCHES AND CONTROLS
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Power Switch
When this button 1s pushed in, power 1s applied
to the amplifier. To shut the power off, push the
button again.
Headphones Jack —=
To monitor a tape or to enjoy private listening
through a headset without disturbing others, plug
into the HEADPHONES jack. Dynamic stereo
headphones are recommended for use.
-
Bass Control
Boosts or cuts low-end response according to per-
sonal taste, speaker response, and listening con-
ditions. With the control in the mid-position, the
bass tones will sound exactly as recorded or
broadcast. To emphasize the bass, turn it clock-
wise. To decrease the intensity of the bass tones,
turn it counterclockwise.
wa Speaker Selector Switch
A —Use this position to select one set of speakers
connected to the SYSTEM A outputs on the rear
panel.
A + B— Use this position to play all speakers con-
nected to both SYSTEM A and B outputs.
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Loudness Switch
Provides the correct amount of bass and treble
boost required to compensate tor an apparent loss
of bass and treble at low listening levels.
Les MPX Noise Canceler
Eliminates noise in multiplex programs broadcast
by weak or distant stations.
— Tuning Knob
Turn this knob to select FM or AM stations ot
your choice.
Mode Switch
STEREO: Use this position for all stereophonic
programs.
MONO: Use this position for all monophonic pro-
grams. The MODE switch in the MONO position
connects either right or left, or both right and left
programs, to speakers of both channels.
Tape Monitor Switch
The Tape Monitor switch enables you to compare
a recorded tape with the original program. When
this switch 1s turned down, the tape being record-
ed is heard from the speakers. Monitoring 1s
possible with 3-head tape recorders only.
When you play back through the amplifier, the
TAPE MONITOR switch should be in the down
position. In all other cases, make sure the switch
is OFF.
SWITCHES AND CONTROLS
Dial Scales —
These scales are illuminated whenever the pow-
er 1s switched on. The upper scale is for FM sta-
tions and the lower for AM. To select a de-
sired station, turn the Tuning knob which is
located to the right of the dial.
FM Stereo Indicator —=
Automatically lights up when a stereo program
is received. During mono reception, it remains
unlit.
Tuning Meter —
This meter aids in pinpointing a station. When
the needle moves as for to the right as possible,
the station is correctly tuned.
Treble Control
Boosts or cuts the high-end response in the same
way the Bass control handles the low-end re-
sponse.
Volume Control -
Adjusts the overall sound level of both channels.
As the control is turned clockwise, the volume 1s
increased.
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Balance Control ——
This control is used to adjust for equal sound
from both left and right channels, to compensate
for slight imperfections in program materials,
variations in speaker output, and the vagaries of
room acoustics. Turning it clockwise accents the
right channel by reducing the left channel output.
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Speaker Fuse Alarm
Lights up when the Quick Acting Fuses 1s blown
to protect the power transistors from damage
caused by shorts or overloads.
> Selector Switch
PHONO—Selects a record player connected to
the Phono inputs on the rear panel.
FM AUTO—Use this position for FM stereo/
mono programs.
AM—Use this position for AM programs.
AUX—Selects the output of a component con-
nected to the Aux inputs on the rear panel.
OPERATIONS
—— SPEAKER CONNECTION
—— RECORD PLAYING
Connecting Speakers
To connect a stereo speaker system:
1. Connect the (+) terminal of the speaker on your
left (as viewed from the front of the amplifier) to
the terminal marked (+) LEFT SYSTEM A on
the back panel of the amplifier.
2. Conncct the (—) or common terminal of the
left speaker to the terminal marked (—) LEFT
SYSTEM A.
3. Connect the (+) terminal of the right speaker
to the terminal marked (+) RIGHT SYSTEM A.
4. Connect the (—) or common terminal of the
right speaker to the terminal marked (—) RIGHT
SYSTEM A.
When you intend to connect two sets of stereo
speaker systems to this amplifier, be sure to use
speakers having impedance of 8 ohms or more.
If you are using only one speaker, connect the
speaker leads to either right or left channel termi-
nals of SYSTEM A or B.
IMPORTANT: The speakers of both right and left
channels must push the sound waves out together.
This is called phasing. If all (+) and (—) connec-
tions have not been properly made, one channel will
push while the other pulls, causing sound cancella-
tion at some frequencies or in some listening posi-
tion. To correct, reverse the phase (+ and —) of
either speaker system, left or right.
After connection, check to see that wires are not
shorted between the terminals. If shorted, the fuse
may blow out and the amplifier may be damaged.
Connecting Record Rlayers
The following procedures are recommended for use
with a record player or turntable utilizing a mag-
netic cartridge:
1. Connect the left channel output of the stereo
turntable to the LEFT PHONO input jack on the
rear of the amplifier.
2. Connect the right channel output of the turn-
table to the RIGHT PHONO input jack.
3. If a monophonic player or turntable is used, it
may be connected to either RIGHT or LEFT
PHONO input jack.
NOTE: There are two categories of pick-ups, one
using a crystal element and the other using a mag-
netic circuit. From a standpoint of tone quality, a
2 to 10 mV magnetic cartridge is recommended for
use with this amplifier. If a record player with a
crystal cartridge is used, connect the output of the
player to the AUX jacks on the rear of the ampli-
fier.
To Listen to Records
1. Set the Selector switch to the Phono position.
2. Set the Mode switch to either Stereo or Mono,
depending on the type of record player used.
3. Switch on the record player and adjust its speed
of rotation (RPM) to the record to be played
(334, 45 etc.)
4. After placing the needle on the record, adjust
the Balance control for equal sound from both right
and left channels.
5. Use other controls and switches according to
your taste and listening conditions.
NOTE: When playing monophonic records on a
stereo record player, follow the same procedures as
for stereo records for best results. To balance the
sound from both channels, play a monophonic re-
cord the same as a stereo record and adjust the Bal-
ance control so that the sound is heard from a point
midway between the right and left speakers.
SPEAKER TERMINALS
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OPERATIONS
— RADIO RECEPTION
Antenna Connections
AM Ferrite Bar Antenna (Fig. 2)
This highly sensitive antenna, located on the rear
panel, is usually adequate for AM reception. To
use, pull it down and away from the back of the
tuner until it comes to a stop halfway between the
top and the bottom of the amplifier.
This antenna will perform satisfactorily except in
ferroconcrete buildings and in areas remote from
the broadcasting stations. If the antenna is inade-
quate for clear AM reception, the installation of an
outdoor AM antenna is required.
AM Outdoor Antenna (Fig. 1)
To connect an AM outdoor antenna:
1. Connect the flexible PVC wire (supplied) to the
terminal screw marked AM-A on the back panel of
the amplifier and install it slightly away from your
house.
2. Connect grounding wire to the terminal screw
marked GND located in the extreme lower right
hand corner of the back panel.
3. For reasons of safety, be sure to use a lightning
arrester.
FM Antenna (Figs. 3 & 4)
In urban or strong signal areas, the dipole antenna
(supplied) should be connected to the terminals
marked FM 3002. Open it in the form of a“T” and
rotate it until best reception is obtained before fix-
ing it to a wall.
If the amplifier is used in a thick-walled building or
in a fringe area where signals are too weak for ade-
quate FM reception, install an outdoor antenna de-
signed exclusively for FM reception. In this case,
FM antennas of 3000 balanced type and 750
unbalanced type are generally used. Connect either
antenna to the matching antenna terminals.
NOTE: Optimum FM sensitivity cannot be ob-
tained simply by lengthening the antenna. The
proper height and direction of the antenna deter-
mines the best reception.
To Listen to Monophonic
FM Programs
1. Set the Selector switch to the FM Auto position.
2. Keep the Mode switch in either Mono or Stereo
position.
3. Turn the Tuning knob to select the desired sta-
tion. Once selected, adjust it so that the needle of
the tuning indicator moves as far to the right as
possible.
4, Set the Volume control, Bass control, Treble
control and Loudness switch to their proper posi-
tions according to your taste and listening condi-
tions.
To Listen to FM-MPX Stereo
Programs
1. Set the Selector switch to the FM Auto position.
2. Set the Mode switch to Stereo.
3. Select the desired FM stereo station with the
Tuning knob and pinpoint the station with the tun-
ing indicator. If the dial pointer crosses a station
broadcasting MPX stereo, the FM Stereo indicator
above the tuning meter will light up.
4. Adjust the Balance control for equal sound from
both right and left channels.
5. Set the Volume control, Bass control, Treble
control, Loudness switch and MPX Noise Canceler
to their proper positions according to personal taste
and listening conditions.
To Listen to AM Programs
1. Set the Selector switch to the AM position.
2. Keep the Mode switch in either Mono or Stereo
position.
3. Select the desired AM station with the Tuning 4. Use all other controls and switches according to
knob and pinpoint the station with the tuning in- your taste and listening conditions.
dicator.
AM ANTENNA CONNECTION AM FERRITE ANTENNA
FOR DISTANT
RECEPTION PULL ANTENNA BAR DOWN
AWAY FROM THE BACK
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OPERATIONS
—— TAPE PLAYBACK
—— TAPE RECORDING
Connecting a Tape Recorder or
Deck
Tape recorders can be connected to record from,
and playback through, the amplifier. A tape deck
without a playback pre-amplifier can be connected
to play back through the set. Tape monitoring is
possible only with a tape recorder having a sepa-
rate playback pre-amplifier as well as separate re-
cording and playback heads.
DIN Plug Tape Recorder
If your tape recorder has a DIN (German Industrial
Standard) 5-pin plug, plug into the TAPE RE-
CORDER socket on the real panel of the amplifier.
Pin-Jack Tape Recorder
To Record—Connect the recording inputs of a
stereo tape recorder to the TAPE REC terminals
of both channels. If a monophonic tape recorder
is used, connect its input to either left or right chan-
nel TAPE REC terminal.
To Play Back—Connect the playback outputs of a
stereo tape recorder to the TAPE MON terminals
of both channels. If a monophonic tape recorder is
used, connect its output to either left or right chan-
nel TAPE MON terminal.
Monitoring
To monitor a tape while using a 3-head tape re-
corder, follow the same procedures as in the proced-
ing sections. Be sure to set the Tape Monitor switch
to the On position.
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To Record on Tapes
1. Set the Selector switch to the program source to
be recorded.
2. Set the Mode switch to the desired position
(Stereo or Mono).
3. Operate the tape recorder for recording.
4, Use other controls and switches as required.
To Listen to Tapes
1. Turn the Tape Monitor switch on.
2. Set the Mode switch to Stereo or Mono, depend-
ing on the type of recorder used.
J. Set the tape recorder for playback.
4. Use other controls and switches as required.
To Monitor Tapes
1. Turn the Tape Monitor switch on.
2. Set the Mode switch to Stereo or Mono, depend.
ing on the type of tape to be monitored.
3. Set the tape recorder for recording and monitor-
ing.
4. Use other controls and switches as required.
NOTES:
1. Recorded tapes cannot be controlled by the con-
trols and switches on the front panel of the ampli-
fier. They control sound from the speakers only.
2. For best results, record directly through the
amplifier, rather than through microphones placed
in front of the speakers.
3. When not in use, the Tape Monitor switch must
be in the Off position.
4, To connect a tape deck without a playback pre-
amplifier, be sure to use an equalizer.
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MAINTENANCE
Proper Connection of Leadwires
Leadwires should be connected properly to ensure
optimum performance. If wires are loose or touch-
ing other parts, the amplifier may produce noise and
eventually break down. Be sure to read the manu-
facturer’s instructions for your tape recorder or
phonograph before making any connections.
Connecting Wire
Be sure to use adequately thick shielded wire when
connecting a tape recorder, tape deck, phonograph
or other components to the 350. The use of an
ordinary twin lead wire may cause hum or noise.
Don’t use shielded wire longer than 7 feet(2 meters).
The use of a longer wire leads to greater attenua-
tion at high frequencies.
SOLDERING THE LEAD TO THE PIN-PLUG
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SHIELDED WIRE
COMPLETED
How to Eliminate Radio Noise
AM Reception
AM reception noise can often be eliminated by
changing the position of the antenna. If you are
located tar from the broadcasting station, or in the
mountains, a thick-walled building or a block of
such buildings, radio waves will not be received well,
resulting in unstable reception and increased noise.
If reception is poor, connect vinyl wire (supplied)
to the AM antenna terminal and position it for best
reception. If this does not reduce noise or improve
sensitivity, erect an antenna outside the building
and away from the wall. In high intensity signal
areas, turn the AM Distant-Local antenna switch to
the LOC position. This switch 1s located behind the
AM ferrite bar antenna on the back panel of the
350. Some noises are peculiar to a certain broad-
casting frequency or a certain time of day. These
result from the nature of AM signals. In some cases
the noise can be eliminated by grounding the ampli-
fier or reversing the power cord plug-receptacle
connections.
NOTE: If the antenna terminal marked A is touch-
ed with a finger, hum may be heard. This is a
natural phenomenon; the unit is not faulty.
FM Reception
Noise during FM reception can be generally attrib-
uted to either insufficient antenna input or interfer-
ence from other electrical appliances.
Antenna input is insufficient when the antenna 1s
not installed properly or when the station is far away.
Extend and fix the attached antenna so that noise
1s minimized and the antenna input is at maximum.
For better results, install an exclusive FM antenna
in a position to receive signals most effectively.
If you use a TV. antenna for the TV. set and the
FM unit with a divider, make sure that television
reception is not affected. To prevent noise, avoid
using a long antenna wire.
FM reception is affected considerably by the trans-
mitting conditions of certain stations; usually their
power and antenna efficiency. You may receive one
station quite well and another poorly.
Noise Common to FM and AM
In an area with many ferroconcrete buildings, noise
may occur at a particular time of day. This noise is
easily distinguished from that described above. To
eliminate such noise, attach a noise arrester to the
interfering electrical appliance or to the power
source of the 350. When you are listening to a
FM-MPX program, you may notice a noise not
heard with monophonic FM broadcasts. In some
cases, you can also eliminate the noise by setting
the Treble control to a “flat” or lower position.
Where to Place
Transistors are extremely susceptible to heat, so
the 350 should not be placed where it is exposed
directly to the sun, high temperatures, or in an air-
tight box. Nothing should be placed on the ampli-
fier.
Local-Distant Antenna Switch
This adjusts the tuner to the strength of FM waves
and should be set to DIST if you live in an area
where FM signals are weak.
If you live near broadcasting stations and there is
danger of interference from other stations, set the
switch to LOC.
Grounding
Connect one end of vinyl or enamel wire to the ter-
minal screw marked G on the rear of the amplifier;
attach a copper plate to the other end and bury it
underground. If an AM outdoor antenna is install-
ed, grounding is necessary. Connect the ground-
ing wire to the terminal screw marked GND, and
hum noise will be eliminated.
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FM MPX Separation
If the channel separation during FM-MPX stereo
reception is inadequate or excessive, turn the screw
marked MPX SEPARATION for natural propor-
tions. Never adjust it without reason.
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MPX /
SEPARATION
— 14 —
MAINTENANCE
Speaker Fuse Alarm
If shorts occur at speaker terminals or input circuits
are overloaded, the Quick Acting Fuses on the rear
panel will blow to prevent the expensive silicon
transistors from being damaged and the Speaker
Fuse alarm on the front will glow red to indicate
the occurrence of the trouble. At the same time,
the sound from speakers will be distorted and re-
duced in volume. In this case, immediately remove
the power cord from the wall outlet and eliminate
the source of trouble that caused them to blow.
Then, check for the blown fuse or fuses, and replace
them with new 1.5-ampere quick-acting fuses (sup-
plied). Never attempt to use other fuses than speci-
fied. Such fuses, if used, may damage the transis-
tors.
Note that the Speaker Fuse alarm lights under the
conditions described above, only if there is an input
signal and the volume control is turned to a suffi-
ciently high level.
SPEAKER FUSES
QUICK ACTING FUSES 1.5A
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AC Outlet
The 350 is provided with a 150VA power outlet
on its rear panel. It can be used as an AC power
source for other components such as a turntable,
but care should be taken not to use it for any com-
ponent that exceeds its 150VA power capacity.
Power Fuse
If the unit does not work due to a blown fuse, re-
move the power plug from the wall outlet and re-
place the fuse. Before replacing, find and eliminate
the source of trouble.
Use a glass-tubed 2-ampere fuse. Never attempt
to use a piece of wire or a fuse with a different capa-
City.
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MAX 150VA
— 15 —
Hum and Howling
If, when using a tape record or record player, un-
pleasant humming or howling is heard, it is usually
a result of the following.
The record player is placed on or near the speaker
box causing sound waves to be transmitted from
the speaker to the player (howling). To prevent
this, place the record player away from the speaker
box or put a thick cushion between the two com-
ponents.
A low buzzing sound will also be produced if ade-
quately thick shielded wire is not used for connee-
tions, or if connections have not been properly
made. Be sure that the shielded wire is properly
soldered to the pin-plug and that the motor and
pickup arm of the record player are properly
grounded.
Voltage Selector Plug
The 350 can be operated at four different voltages:
100, 117, 220 and 240V. The voltage selector plug.
Is adjusted to your area prior to shipment. To
change, pull the plug out, move the arrow head to
the proper voltage in your area, and re-insert the
plug firmly.
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220V— —100V
DIN Connector
The Tape Recorder receptacle on the rear panel
accepts a DIN (German Industrial Standard) 5-pin
plug of a tape recorder. Since the single plug is
used for both recording and playback, the tape re-
corder connection is largely simplified.
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TAPE RECORDER
Phasing
The right and left speakers must be properly phased
so that the two channels push the sound waves out
together. If one pushes while the other pulls, there
1s sound cancellation will occur at some frequencies
or in some listening locations. Incorrect phasing is
caused by improper speaker connections and 1s by
a loss of bass when a monophonic record is listened
to on a stereo player at a point halfway between the
two speaker systems. If incorrect, reverse either the
(+) or (—) speaker connection.
— 16 —
SPECIFICATIONS
CHARACTERISTICS
AUDIO SECTION
POWER OUTPUT:
MUSIC POWER (IHF): 46W at 8 ohms
40W at 4 ohms
CONTINUOUS POWER (each chan.):
18W/18W at 8 ohms
16W/16W at 4 ohms
HARMONIC DISTORTION: less than 1.0% at rated
output
INTERMODULATION DISTORTION (60Hz: 7,000Hz=
4:1, SMPTE): less than 1.0%
POWER BANDWIDTH (IHF): from 30 to 20,000Hz at
8 ohms
FREQUENCY RESPONSE (at normal listening level):
POWER AMPLIFIER SECTION:
from 20 to 30,000Hz + 1.5dB
AUX: from 25 to 30,000Hz + 1.5dB
CHANNEL SEPARATION (at 1,000Hz, rated output):
PHONO: better than 40dB
AUX: better than 45dB
HUM AND NOISE (IHF):
PHONO: better than 60dB
AUX: better than 65dB
INPUT SENSITIVITY (for rated output at 1,000Hz):
PHONO: 2.2 mV
AUX: 150 mV
TAPE MONITOR (PIN jack): 150 mV
TAPE RECORDER (DIN jack): 150 mV
RECORDING OUTPUT:
TAPE REC (PIN jack): 180 mV
TAPE REC (DIN jack): 30 mv
OUTPUT IMPEDANCE: from 4 to 16 ohms
DAMPING FACTOR: 34 at 8 ohms
EQUALIZER:
PHONO: RIAA, NF type
CONTROLS AND SWITCHES:
BASS CONTROL: + 10dB at 50Hz
TREBLE CONTROL: + 10dB at 10,000Hz
LOUDNESS CONTROL: +8dB at 50Hz, +3dB at
10,000Hz (volume control at
— 30dB)
SELECTOR SWITCH: 1) PHONO 2) FM AUTO
3) AM 4) AUX
SPEAKER SWITCH: system A / system A+B
OTHER SPECIAL FEATURES:
Direct Tape Monitor, DIN Connector for Tape Recorder,
Loudness Control Switch, HEAD PHONE Jack, Speaker
Fuse Alarm.
TUNER SECTION
FM:
FREQUENCY RANGE: from 88 to 108MHz
SENSITIVITY: 2.51V (20dB quieting)
ЗиУ (IHF)
HARMONIC DISTORTION: less than 1%
SIGNAL TO NOISE RATIO: better than 50dB
SELECTIVITY: better than 45dB
IMAGE FREQUENCY REJECTION: better than 40dB
IF REJECTION: better than 45dB
FM STEREO SEPARATION: better than 30dB
SPURIOUS RESPONSE REJECTION: better than 50d&
SPURIOUS RADIATION: less than 34dB
AM:
FREQUENCY RANGE: from 535 to 1,605kHz
SENSITIVITY (IHF): 254V at 1MHZ
IMAGE FREQUENCY REJECTION:
better than 40dB at 1,000kHz
IF REJECTION: better than 45dB at 1,000kHz
SELECTIVITY: better than 20dB
OTHER SPECIAL FEATURES:
Tuning Meter, Fly-wheel Tuning, FM Stereo Auto,
FM Stereo Indicator, 300 ohms balanced and 75 ohms
unbalanced Antenna Terminal for FM, FM Local /Distant
Switch. AM Ferrite Bar Antenna.
SEMICONDUCTORS
TRANSISTOR AND FET: 31
DIODE: 21
VARISTOR: 2
THERMISTOR: 1
— 17 —
POWER REQUIREMENTS
POWER VOLTAGE: 100, 117, 220 and 240V. 50 or
60Hz
POWER CONSUMPTION: 40VA (zero signal)
70VA (max. signal)
DIMENSIONS (Without knobs, rubber stands and
bar antenna):
WIDTH: 15%”
HEIGHT: AU
DEPTH: 131g”
WEIGHT: 19.4 lbs.
* All rights reserve specifications subject to change without notice.
POWER OUTPUT HARMONIG DISTORTION |
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Sansui
SANSUI ELECTRIC COMPANY LIMITED
Head Office; 14-1, 2.chome, lzumi, Suginami-ku, Tokyo, Japan. TEL. 323-1111
Printed in Japan (49020M5)
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