Kenwood KA-990 User manual

:
NEW HIGH SPEED STEREO ‘
INTEGRATED
AMPLIFIER
INSTRUCTION MANUAL
KENWOOD
PRINTED IN JAPAN B50-4534-00 (U,M,UE,H,X) (T)
ON/384 D12345/454
ARMA

Before applying power
i 7
Important!
U.S.A. and Canada All other countries
Units shipped to the U.S.A. and Canada are Units shipped to countries other than the U.S.A.
designed for operation on 120 volts AC only. and Canada are equipped with an AC voltage
These units are not equipped with AC voltage selector switch on the rear panel.
selector switch and the discussion of such a
Refer to the following paragraph for the proper
switch that follows should be disregarded. setting of this switch.
Lg ek
AC voltage selection
This unit operates on 120 volts, 220 volts or
240 volts AC. The AC voltage selector switch on the
rear panel is set to the voltage that prevails in the area
For United Kingdom
The mains plug must be removed from the wall socket
prior to any internal examination.
to which the unit is shipped. Before connecting the Important
power cord to your AC outlet, make sure that the set- The wires in this mains lead are coloured in accordance
ting position of this switch matches your line voltage. If with the following code:
not, it must be set to your voltage in accordance with BUG taint. tubs ioraires Radaeedecnesa, Neutral
the following direction. BROWN sxescsaart ocdeeaapnsatas canadien ts Live
Note:
Our warranty does not cover damage caused by excessive line
The wires in this mains lead must be connected to the
voltage due to improper setting of the AC voltage selector switch.
terminals in the plug as follows:
Wire Colour Plug Terminal Marking
BG acess sone ian va ondpaseshaeane: N or Black
Stopper plate Lever Screw TOWN tends snincncan SAwa ss awk td nantly L or Red
AC120 A prmcmics Biece 2a0V a SET |
AC 120V~
Setting
©
CJ
OC
i,
©
C)
E
eee Brown to
AC1 ZO] ACEEOY AC240V Live
AC 220V~ ® OC ® O © \ Blue to
Setting Neutral
c120V AC220V AC2ADV
AC 240V~ ———_ Plug
Setting ® 0 C) @ @
Notes:
1) tf a 13-amp plug is used, this must be fitted with a 5-amp fuse.
: avec oa nga 2) \f a 3-pin piug with earthing contact is used, no wire must be con-
3.
Lock
levers
with
stopper
plate
and
nected
to
the
E
terminal
screws.
ae ae a WARNING:
voitage serector Swi
on TO PREVENT FIRE OR SHOCK
HAZARD, DO NOT EXPOSE THIS
Safety precautions APPLIANCE TO RAIN OR MOISTURE.
CAUTION CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK, DO NOT REMOVE COVER
(OR BACK). NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO
RISK OF ELECTRIC SHOCK DO
Neyme)a
=)
QUALIFIED
SERVICE
PERSONNEL.
The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to
alert the user of the presence of uninsulated ‘‘dangerous voltage’’ within the product's
enclosure; that may be of sufficient magnitude to constitute a risk of electric shock to
persons.
:
The exclamation point within an equilateral triangle is intended to alert the user of the
presence of important operating and maintenance (servicing) instructions in the
literature accompanying the appliance.
2 KA-990(U)

Contents
Before applying POWE! .......... cece ee reece 2
Safety precautions ............cccee ee cee ee see eet eet eee eee 2
Before Operation ..... 0... eee sere eee e eet e eee e ees 3
System CONNECTIONS ........ 2 ec cece een es 4
Controls, indicators and connectors ...............:.60ee 6
Operating instrUCtiOns........... eee eee ee ee eee eee eee es 8
In case of difficulty 00.0.0... ccc cece ccc ee cece eee neee eens 10
SPOCiiCBtIONS cc svees duseeeticesnd ceiV eos ec edeyeode ones 11
For your records
Record the serial number, found on the back of the unit,
in the spaces designated on the warranty card, and in
the space provided below. Refer to the model and serial
numbers whenever you call upon your dealer for infor-
mation or service on this product.
Model KA-990 Serial number
Unpacking
Unpack the unit carefully and make sure that all ac-
cessories are put aside so they will not be lost.
Examine the unit for any possibility of shipping
damage. lf your unit is damaged or fails to operate,
notify your dealer immediately. If your unit was shipped
to you directly, notify the shipping company without
delay. Only the consignee (the person or company
receiving the unit) can file a claim against the carrier for
shipping damage.
We recommend that you retain the original carton and
packing materials for use should you transport or ship
the unit in the future.
Before operation
Safety precautions
Never remove the case. If the internal parts are touch-
ed, accidentaly, a serious electric shock might occur.
Never touch internal
parts.
If
a.metal
object,
such
as
a
hair
pin
or
a
needle,
comes
into
contact
with
the
power
socket
on
the
rear
panel,
a
dangerous
electric
shock
may
result.
For
families
with
children,
never
permit
children
to
put
anything,
especially
metal,
inside
this
unit.
Do not connect other audio equipment with a power
consumption larger than that specified to the AC outlet
on the rear panel. Never connect other electrical ap-
pliances, such as an iron or toaster.
os Never connect other
electrical appliances.
Touching the power plug when your hands are wet
may result in a serious electric shock.
“ ay
~ y, Never touch with wet
hands.
64
Never pull, bend or extend the power cord. This could
damage the power cord, resulting in a broken cord or
short-circuit.
N
Never pull or stretch
“the cord.
7
In case of abnormal smell
|f an abnormal smell or smoke is detected, immediately
turn the power OFF and pull out the power cord. Con-
tact your dealer or nearest service station.
Cleaning
Do not use volatile solvents such as alcohol, paint thin-
ner, gasoline, benzine, etc. to clean the cabinet. Use a
silicone cloth or a clean dry cloth.
Sibcome
Cloth
\—
Silicone cloth Thinner Benzine
Installation precautions
a) Avoid locations subject to direct sunlight.
b} Avoid high or low temperature extremes.
c) Keep the unit away from heat radiating sources.
d) Choose a location that is relatively free of vibration
or excessive dust.
e) Make sure power is off before making any system
connections.
KA-990(u) 3
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System connections
Tuner Turntable
100
Speakers
This amplifier has two pairs of speaker terminals, SPEAKERS
A and SPEAKERS B.
Connecting one speaker system
Connect speakers rated at 4 ohms or more to the SPEAKERS
A terminals.
Although ordinary speaker cords can be connected to the
SPEAKERS A terminals, the © drive system will reproduce
better sound with the L cords connected to the SPEAKERS A
terminals.
Connecting two speaker systems
To connect an additional pair of speakers, use the B ter-
minals. In this case, each speaker must be rated a 8 ohms or
more.
Connecting an ordinary speaker system
Connect the left speaker to the LEFT SPEAKERS A or B ter-
minals and the right speaker to the RIGHT SPEAKERS A or B
terminals.
At this time, be sure to connect the (+) terminals of the
4 ka-990(u)
Speaker system A
Right Left
m
[—]
TOTAL 1cOWw max facow Max \e/
SWITCHED UNSWITCHED,
European types are not equipped
with these outlets.
To AC outlet
Speaker system B
speakers to the (+) terminals of the amplifier and (—) ter-
minals in the same manner respectively.
Notes:
1. The tips of the connected wires should not touch adjacent ter-
minals.
2. lf the SPEAKERS A terminals are connected with ordinary cords,
connect only inner terminals but not XE SENSOR (shaded) ter-
minals.
[io wa @
Remove insulation as Twist wire tightly,
3/8” from lead tip. and solder.
3
Insert the lead tip as Turn the knob clock- To ensure firm con-
far as it will go. wise to lock the wire. tact, pull the wire
slightly.
Connecting speaker cords

Warning!
Particular
attention
must
be
given
to
making
good
electrical
contact
at
the
ammplifier-output
and
speaker
terminals.
Poor
or
loose
connections
can
cause
sparking
or
burning
at
the
ter-
minals
because
of
the
very
high
power
that
the
amplifier
can
deliver.
Connecting © cords
Prepare
the
£
cords
a
shown
in
figure.
The
figure
‘’L
cords’’
below
shows
one
channel!
cords
for
D
drive.
Two
of
these
cords
are
needed
for
both
channels.
Connect
each
end
of
the
E
cords
to
the
correct
terminal
of
the
amplifier
and
speaker
as
shown
in
the
figure
‘’Z
cords
connections’.
Note:
Never
connect
the
amplifier
end
of
the
£
cords
to
same
polarity
terminals
(£
SENSOR
(+)
to
(+)
terminal,
or
£
SENSOR
(—)
to
(—)
terminal).
To amplifier
SPEAKERS A To speaker terminal
terminals (+) or (-)
To (+) terminal
To (+) terminal
To (—) terminal 2-core flat cord x 2
for one channel
To © SENSOR
(+) terminal =
To & SENSOR
posal’ > cords Twist and solder.
Right speaker
Left speaker
x cords connections
Turntable
The
PHONO
jacks
of
the
amplifier
can
accept
a
turntable
with
either
an
MM
or
MC
type
phono-cartridge.
Your
stereo
turntable
has
a
pair
of
audio
cables
that
is
ter-
minated
with
phono
plugs.
Plug
the
left
channel
plug
into
the
LEFT
and
the
right
channel
plug
into
the
RIGHT
PHONO
jacks.
If
the
turntable
has
a
ground
wire,
connect
it
to
the
unit's
GND
terminal
to
avoid
hum.
Tuner
Use
the
TUNER
terminals
for
connection
to
an
FM
stereo
or
AM-FM
stereo
tuner.
Connect
the
left
channel
of
the
tuner
to
the
LEFT
TUNER
input
jack
and
the
right
channel
of
the
tuner
to
the
RIGHT
TUNER
input jack.
AUX/D.A.D.
Additional
AUX/D.A.D.
jacks
(FRONT
AUX/D.A.D.)
are
equipped
with
this
unit
on
the
front
panel
to
facilitate
an
operation
of
an
equipment
to
be
connected
to
these
jacks.
Selecting
the
source
equipments
connected
to
the
AUX/
To (—) terminal
D.A.D. jacks on the rear/front panel is performed with the
AUX/D.A.D. (REAR/ FRONT) switch. To these jacks, high-
level signal sources such as, tuner, extra tape decks, TV, VCR
sound outputs, mic preamps, etc. can be connected.
Ground
For maximum safety and minimum interference connect the
GND terminal to a good earth ground if practicable. A good
earth ground is a cold water pipe or a metal stake driven into
moist earth. However, never use a gas pipe for this purpose.
Tape decks
If only one tape deck is to be connected to the system it is recom-
mended that.it be connected to the jacks marked TAPE A.
Tape deck input and output cables are normally terminated with
phono plugs.
Piayback
Plug the left and right output cables of the tape deck into the
LEFT and RIGHT TAPE A PLAY jacks.
Record
Plug the left and right input cables of the tape deck into the
LEFT and RIGHT TAPE A REC jacks.
DIN connector (European types only)
\f your tape deck is equipped with a DIN connector, connect it
to the TAPE B REC/PLAY connector with the DIN connecting
cord. The DIN connection makes both input and output con-
nections with a single cord, and the signal must be controlled
with the REC OUT switch and TAPE B switch on the front
panel.
Notes, 2.
\f connections are made with a DIN connecting cord, the TAPE B
PLAY and REC jacks should not be used.
Second tape deck
Plug the input and output cables from the second tape deck
into the REC and PLAY jacks marked TAPE B.
AC outlets (Except European models)
The AC outlets on the rear panel of the unit may be used to
supply power to other components in the system, such as
turntables, tapé decks, etc. Never connect equipment whose
power consumption exceeds the maximum value shown at
each outlet.
1. SWITCHED outlets: These outlets supply power only
when the unit is turned on. The maximum total capacity
(both outlets) is 100 watts.
2. UNSWITCHED outlet: The outlet provides power when the
unit is plugged into an active AC wall outlet, regardless of
the setting of the POWER switch. The maximum capacity
is 400 watts.
PHONO IMPEDANCE (MM) selector switch
When using a moving magnet cartridge, set this switch to the
appropriate position according to the impedance of cartridge.
KA-990(U) 5
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Controls,
indicators
and
connectors
0 9o 8
[[_ roves $3
DPERATING INDICATOR:
@ REC OUT switch
This switch is designed to record from a source other
than that selected by the input selector switches.
OFF — With this setting no signal is output from
the REC jacks; the source signal comes out of the
speakers without the slight degradation that would
take place if a tape deck was connected.
Keep this position when not recording.
PHONO — This setting permits the recording of the
record played on the turntable connected to
the PHONO jacks.
TUNER — This setting makes the tuner the program
source for recording.
AUX/D.A.D. — This setting permits a recording of the
program source connected to the AUX/D.A.D.
jacks.
TAPE DUBBING Arm B — When dubbing from the tape
deck connected to the TAPE A jacks to the tape
deck connected to the TAPE B jacks.
TAPE DUBBING Be» A — When dubbing from the tape
deck connected to the TAPE B jacks to the tape
deck;connected to the TAPE A jacks.
@ SPEAKERS switch
OFF — This position disconnects the speakers to
permit private listening with headphones.
x DRIVE A — Activates speakers connected to the
SPEAKERS A terminals on the rear panel. This set-
ting can be used whether the speakers are con-
nected with L cables or with conventional 2-lead
cables.
B — Activates speakers connected to the SPEAKERS B
terminals on the rear panel.
A+B — Activates speakers connected to the
SPEAKERS A and B terminals simultaneously.
In this setting, however, the speakers connected to
the SPEAKERS A terminals do not perform in the &
drive mode even though they are connected with ©
cables.
6 KA-9901U)
© Input selector switches
TAPE A — To monitor a recording in progress or to
playback a tape from a tape deck connected to the
TAPE A jacks.
TAPE B — To monitor a recording in progress or to
playback a tape from a tape deck connected to the
TAPE B jacks.
AUX/D.A.D. — Selects the program source connected
to the AUX/D.A.D. jacks.
TUNER — Selects the tuner connected to the TUNER
jacks.
PHONO — Selects the program source played on the
turntable.
Note:
When ail the input selectors are in their OFF positions with the power
on, no input selector indicators light. Press the desired selector
switch to set source.
© Cartridge selector switch (MM, MC)
MM — Push when using MM (moving magnet) and
high-output MC (moving coil) cartridges.
MC — Push when using MC cartridges.
@® MUTING switch
Pressing this switch cuts off the sound output and puts
out the light above the switch. It is useful for preventing
loud clicks or thumps when the stylus is placed on a
record or to reduce the volume for same reason, such
as answering the telephone. To release muting, press
this switch again.
@ VOLUME control
This control adjusts left- and right-channel volume
simultaneously. Set it for the desired listening level.
@ POWER switch
Press this switch to turn on the power. To turn the
power off, press the switch again to set it to the out
position.
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@ PHONES jack
Plug
stereo
headphones
into
this
jack
for
private
listen-
ing.
The
speakers
are
silenced
when
the
SPEAKERS
switch
is
set
to
OFF.
@ Tone controls
TONE
switch
—
Setting
this
switch
to
ON
inserts
the
tone
control
circuit
into
the
signal-path.
This
permits
adjustment
of
tone
by
turning
the
BASS
and/or
TREBLE
controls.
To
obtain
flat
response,
push
to
release
the
switch,
OFF
setting.
BASS
—
Turning
this
control
clockwise
will
increase
bass
response.
Turning
it
counterclockwise
will
decrease
the
bass
response.
The
‘‘0”’
setting
pro-
vides
a
flat
bass
response.
TREBLE
—
Turning
this
control
clockwise
will
increase
the
high-frequency
response.
Turning
it
counterclockwise
will
decrease
the
high-frequency
response.
The
‘‘0’’
setting
provides
a
flat
high-
frequency
response.
@ MODE switch
STEREO
—
This
provides
stereophonic
reproduction
of
any
stereo
program
source.
The
left
channel
is
heard
from
the
left
speaker,
and
the
right
channel
is
heard
from
the
right
speaker.
MONO
—
Monophonic
reproduction.
The
left
and
right
channels
are
mixed
together
and
heard
from
both
speakers.
@
DC
COUPLED/SUBSONIC
FILTER
switch
DC
COUPLED
—
With
the
switch
in
this
setting,
no
capacitor
is coupled
in the
signal
path
from
the
TUNER,
AUX/D.A.D.,
and
TAPE
PLAY
jacks
to
the
SPEAKERS
terminals
so
that
the
frequency
response
is
perfectly
flat.
Use
this
setting
to
reproduce
program
sources
containing
ultra
low
frequencies.
SUBSONIC
FILTER
—
With
the
switch
in
this
setting,
signals
below
18 Hz
are
attenuated
at
the
rate
of
6
dB
per
octave.
Although
such
signals
are
inaudi-
ble,
they
can
cause
intermodulation
distortion
components
in
the
audible
range.
It
is
recommend-
ed
that
this
switch
be
depressed
at
all
times,
even
if
no
turntable
rumble
is
apparent.
@ LOUDNESS switch
ON
—
Bass
notes
are
boosted
at
low
listening
levels.
This
precisely
offsets
a
characteristics
of
human
hearing
whereby
we
are
less
sensitive
to
bass
notes
at
very
low
listening
levels.
OFF — The low-level bass boost is removed.
@®
BALANCE
control
This
control
permits
balancing
of
the
left
and
right
channels
when
an
imbalance
exists
from
the
sound
source,
or
to
correct
acoustic
imbalance
due
to
room
conditions.
Turn
it
to
the
left
from
the
CENTER
position
to
boost
the
left
channel;
turn
it
to
the
right
of
CENTER
to
raise
the
level
of
the
right
channel.
@ FRONT AUX/D.A.D. jacks and AUX/D.A.D.
(FRONT/REAR) switch
FRONT AUX/D.A.D. jacks — Temporarily used high-
level signal sources such as, tuner, extra tape
decks, TV, VCR sound outputs, mic preamps, etc.
are connected to these jacks.
AUX/D.A.D. switch — Pressing this switch selects
source equipments connected to the AUX/D.A.D.
jacks on the front or rear panel.
Thermal protector
This unit employs the thermal protector circuit
which automatically shuts off the power or fades
out the sound if the temperature inside the
amplifier becomes unusually high. The protector
automatically restores the power when the
temperature drops to the normal level and the
cause of the unusual temperature rise must be
removed before the power is restored. Unusually
high temperatures may be caused in poor ventila-
tion condition or by a shorted output circuit.
KA-990(U) 7
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Operating instructions
Prior to operation
It
is
recommended
that
rarely
used
controls
and
swit-
ches
be
preset
in
accordance
with
your
preference
in
order
to
simplify
operation.
Once
these
controls
and
switches
have
been
preset,
normal
operation
is
simply
turning
on
the
POWER
switch
and
selecting
the
desired
program
source
by
depressing
one
of
the
input
selector
switches.
Set to OFF.
Set to the desired
Set to OFF.
POweR ———-—
OPERATING INDICATOR
Set to OFF.
Set to the desired
position.
Set to 0.
Tuner
1.
With
your
tuner
connected
to
the
TUNER
jacks,
press
the
TUNER
input
selector
switch
so
that
the
corresponding indicator will go on.
. Tune to the desired station.
3.
Adjust
the
volume
and/or
tone
controls
for
your
preference.
Nh
Turntable
1.
Depress
the
MUTING
switch
to
temporarily
reduce
the
output
volume
level.
2.
With
your
turntable
connected
to
the
PHONO
jacks,
press
the
PHONO
input
selector
switch
so
that
the
corresponding
indicator
will
go
on.
3.
According
to
the
type
of
phono-cartridge
used,
set
the
cartridge
selector
switch.
4. Press the MUTING switch again to release the
muting
function.
5.
Adjust
the
volume
and/or
tone
controls
for
your
preference.
AUX/D.A.D.
1. With your additional program source connected to
the AUX/D.A.D. jacks (on the front/rear panel),
press the AUX/D.A.D. input selector switch so that
the corresponding indicator will go on.
2. Operate the equipment connected to the AUX!
D.A.D. jacks.
3. Adjust the volume and/or tone controls for your
preference.
8 ka-g901U)
Set to the desired position
Set
to
CENTER.
_
if
neccesary.
Set to MM or MC.
Set to OFF.
Set to SUBSONIC FILTER.
Set to STEREO.
Tape decks
Tape playback
1. Select the tape deck connected to the TAPE A
and/or B jacks with the input selector switch so that
the indicator corresponding to the desired tape deck
(A or B) goes on.
2. Operate the tape deck to playback your recorded
tape.
3. Adjust the volume and/or tone controls for you
preference.
Recording (with one tape deck)
1. Set the REC OUT switch to PHONO, TUNER, or
AUX/D.A.D. in accordance with the desired source.
2. Set up the program source component for operation
and set up your tape deck for recording.
3. Set recording levels with the controls on your tape
deck. The controls other than the REC OUT switch
on the amplifier do not affect the signal output to the
tape deck.
Recording (with two tape decks)
1. Connect two tape decks to the TAPE A and TAPE B
jacks.
2. Set the REC OUT switch to PHONO, TUNER, or
AUX/D.A.D. in accordance with the desired source.
3. Set up your two tape decks for recording.
4. Recording levels should be set using controls on the
individual tape decks.

Monitoring
lf your tape deck is equipped with three heads, you can
compare the sound quality of the recording in progress
with that of the program source; the source sound can
be heard by depressing the input selector switch
(PHONO, TUNER or AUX/D.A.D.) and the recorded
sound can be heard by depressing the input selector
switch (TAPE A or TAPE B).
Tape-to-tape dubbing
When two tape decks are connected to the TAPE A and
TAPE B jacks, tape recordings may be duplicated easily
using one tape deck to play the prerecorded tape and
the other tape deck to record the copy. Set the REC
OUT switch as follows:
TAPE DUBBING A » B — To record a copy on tape
deck B from a tape played on tape deck A.
TAPE DUBBING B » A — To record a copy on tape
deck A from a tape played on tape deck B.
Note:
The settings of the input selector switches do not affect dubbing. Ad-
just the recording level on the deck that is making the copy using that
deck’s operating controls. Start both decks (piay and record)
simultaneously. By using a three-head tape deck for the copy,
monitoring is possible by depressing the TAPE A or TAPE B input
selector switch. At this time, be sure not to depress both TAPE input
selector switches simultaneously.
REC OUT operation
The setting of this switch to PHONO, TUNER, or
AUX/D.A.D. directly connects the tape deck to the
source signals; the desired source signal for the record-
ing is fed to the TAPE REC jacks regardless of the set-
ting of the input selector switches.
By setting this switch to OFF with a tape deck con-
nected, the tape deck REC connection is isolated from
the amplifier’s signal path, therefore, the source signals
are not affected by tape deck’s impedance. In this
respect, set this switch to OFF when not recording.
Recording of AM/FM broadcasts while listening to
records
1. Press the PHONO input selector switch.
2. Operate the turntable.
3. Set the REC OUT switch to TUNER and receive the
AM/FM broadcast.
4. Operate the tape deck to record the AM/FM broad-
cast. Adjust the recording level with the recording
level controls of the tape deck.
5. To listen to the AM/FM broadcast, simply press the
TUNER input selector switch. The recording of the
AMIFM broadcast will continue.
Source
from tuner
iH
Tape deck Recording
Turntable
Recording of a broadcast while listening
to records
Recording of records while listening to an AM/FM
broadcast
1. Press the TUNER input selector switch.
2. Operate the tuner.
3. Set the REC OUT switch to PHONO and operate the
turntable.
4. Operate the tape deck to record the record. Adjust
the recording level with the recording level controls
of the tape deck.
5. To listen to the record, simply press the PHONO in-
put selector switch. The recording of the record will
continue.
Source
from tuner
Tape deck Recording
Turntable
Recording of records while listening
to a broadcast
Using as a power amplifier
This unit can also be used as a power amplifier of
one-volt input sensitivity.
The operating procedure is as follows:
1. Set the input selector switch to AUX/D.A.D..
2. Set controls and switches, such as tone controls,
filters, loudness, etc., to the designated settings
in order to obtain the flat frequency response.
3. Set the VOLUME CONTROL to the ‘’5"' position.
4. Turn the POWER switch on after completion of
connections from the external source to the AUX/
D.A.D. jacks.
=I
KA-990(U) J

In case of difficulty
{f
your
unit
should
not
perform
as
expected,
consult
the
table
below
to
see
if
the
problem
can
be
corrected
before
seek-
ing
help
from
your
dealer
or
service
representative.
AM, FM, PHONO or Tape
playback
Cause
Remedy
Power on but no sound.
a) Power cord not plugged in.
b) Poor connection at wall outlet.
Power outlet inactive.
c) VOLUME CONTROL set fully
counterclockwise.
a) Check plug contact.
b) Check outlet using a lamp or other
appliance (outlet may be controll-
ed by a wall switch).
c) Set the control to your preference.
No sound from left or right.
a) Speaker cords disconnected.
b) Speakers switched off.
c) No input selector switch is in
use.
a) Check speaker connections.
b) Check speaker switch.
c) Press one of the selector switches
to select the desired program.
Sound from left or right, but not
both.
PHONO playback only
No sound from both or one
speaker.
Loud hum drowns out sound.
Low background hum.
a) Poor speaker connections.
b) Defective speaker.
c) BALANCE control set to one ex-
treme or the other.
Cause
Turntable output disconnected.
Poor ground connection at phono
cable connections.
Hum Picked up in turntable or
turntable cables.
a) Check connections at both ends of
speaker cord.
b) Reverse speakers, if problem
stays with speaker have speaker
checked.
c) Check BALANCE control setting.
Remedy
Check phono cables.
Check phono plugs, particularly
outershell connections.
Keep cables away from power cords.
Twist left and right cables together.
Reverse AC plug of turntable. Con-
nect ground wire between turntable
and GND connector.
Background buzz.
TV signal picked up. by phono
cable (especially near transmitter).
Route phono cables to minimize
buzz.
Howling noise at maximum
volume settings.
Acoustic pickup from speaker.
Increase distance between speaker
and turntable. Choose speaker loca-
tions carefully. Check turntable
suspension.
10 KA-9901U)

Specifications
IHF
IEC
Power Amplifier Section
Power Output
105
watts*
per
channel
minimum
RMS,
both
channels
driven
at
8
ohms
from
20
Hz
to
20,000
Hz
with
no
more
than
0.005%
total
harmonic
distortion.
Both Channels Driven into
8 ohms at 1 kHz..................... 127 W
Dynamic Power Output into
8 ohms |... eee cee 170 W
Total Harmonic Distortion
(20 Hz to 20,000 Hz)
AUX/D.A.D. input to
SPEAKER output ................ 0.005% at rated power
into 8 ohms
0.005% at 1/2 rated power
into 8 ohms
Intermodulation Distortion
(60 Hz:7 kHz= 4:1)...............4 0.005% at rated power
into 8 ohms
Damping Factor ...................... 1,000, at 100 Hz
Transient Response
Rise Time .....................00500008 1.7 ps
Slew Rate +100 Vips
Frequency Response
DC
COUPLED
at
ON................
DC
to
200
kHz,
+0 dB, -3 dB
DC COUPLED at OFF............... 18 Hz to 200 kHz,
+0 dB, —3 dB
Speaker Impedance................... Accept 4 ohms to 16 ohms
Input Sensitivity/Impedance
Phono
MM
..............6..0:50:06e
2.5
mV/33
k
ohms,
47
k
ohms
and 100 k ohms
Phono MC..................:0: eee 0.2 mV/100 ohms
Tuner, AUX/D.A.D., Tape ........ 150 mV/47 k ohms
Signal-to-Noise Ratio (IHF. A)
Phono MM .................:0:50:00 88 dB for 2.5 mV input
94 dB for 5.0 mV input
100 dB for 10 mV input
Phono MC..................:: cee 69 dB for 0.25 mV input
75 dB for 0.5 mV input
Tuner,
AUX/D.A.D.,
Tape........
107
dB
for
150
mV
input
Maximum Input Level for Phono
IMI
oie
Secce
ete
d
heteinesatseaies
240
mV
(RMS),
T.H.D.
0.005%
at 1,000 Hz
MG vrtececast in daieisiedonenl eeatte teh ee 18 mV (RMS), T.H.D. 0.005%
at 1,000 Hz
Output Level/Impedance
Tape REC (Pin) ....................5. 150 mV/330 ohms
Frequency Response for Phono....RIAA standard curve +0.3 dB
(20 Hz to 20,000 Hz)
Tone Control
Bass )iawiicresdaugend eerie + 10 dB at 100 Hz
Trebles ices ic catch eeeeneertge + 10 dB at 10 kHz
Loudness Control
(at —30 dB VOLUME Level) ..... +10 dB at 100 Hz
Subsonic Filter ......................... 18 Hz, 6 dB/oct
General
Power Consumption ................. 700 W (8 ohms at rated power)
AC Outlets ....0.00... ee Switched 2, Unswitched 1
Dimensions ........................5605- W: 440 mm (17-5/16”}
H: 143 mm (5-5/8)
D: 383 mm (15-3/32”)
Weight (Net) ................-..:..055 10.7 kg (23.5 Ib)
*
Measured
pursuant
to
Federal
Trade
Commission’s
Trade
Regula-
tion
rule
on
Power
Output
Claims
for
Amplifier
in
U.S.A.
Power Amplifier Section
Rated Power Output
8 ohms at 20 Hz to 20,000 Hz
no more than 0,005% THD (FTC) ................. 105 W+ 105 W
4 ohms at 63 Hz to 12.5 kHz -
no more than 0.7% THD (IEC) ...................... 120 W+120 W
Total Harmonic Distortion
Rated Power Output into 8 ohms......................-....5055 0.005%
Intermodulation Distortion.......................::.:cc cee enee een eees 0.005%
Frequency Response ...............0...00.:c0c ce ecceee eee eens DC ~ 200 kHz
+0 dB, —3 dB
S/N Weighted: Rated Output Power (IEC-A)
( ) = Unweighted at 50 mW (DIN)
PhOnO MIM eis cdo ate cosine his Sake auvves cod Pina space: 88 dB (58 dB)
Phono: MG v5.56 es tected these ecoteatees 69 dB
Tuner, Aux/D.A.D., Tape ...............0..50 cece 107 dB (58 dB)
Damping Factor at 8 ohms, 100 Hz ....................:: cee 1,000
Transient Response
Rise Time: 2 inci ashes Sao IT he a ant 1.7 ps
Slew Rate is ate cnr deed cick sas takin iwnaeioctan see ads +100 Vius
input Sensitivity/Impedance
Phono MM .....0..0.0. 0... c cece cette eens 2.5 mV/33/47/100 kQ
PRONG: MG aes se hicdodci vein Asovders aeneaarnewred 0.2 mV/100 Q
Tuner, Aux/D.A.D., Tape .......0..0...0....:cccee cece 150 mV/47 kQ
Tone Control
Bass: 100 HZ oid Secs ocsda esheets eet elds +10 dB
Treble: 10’ kHz 2 6fo ici stadis ck eagt einen tae een eis +10dB
Loudness Control (—30 dB) ..................0 ee 100 ‘Hz, +10 dB
Subsonic Filter ....0...0.0.0.0.0.000.cc cece cece centers neers 18 Hz, 6 dB/oct.
General
Power Consumption
IEG Fo ia ee eect hee hie a eA Ea oni 700 W
Dimensions». .....o5i6scie sends esses inalteateies cosergata rere lees’ W: 440 mm
H: 143 mm
D: 383 mm
Weighit. (Net) f.s..5.sccise arias coi ncens eel ae tenets 10.7 kg
Note:
We follow a policy of continuous advancements in development. For this reason specifications may be changed without notice.
KA-990(U) 11
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