Kenwood KA-4006 User manual

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KA-4006 FEATURES
POWER AMPLIFIER SECTION
1.
Directcoupled withdifferentialamplifier, purecomplementary sym-
metry amplifier circuits are used to assure superior sound quality.
2. Complete protection of expensive power transistors is offered by
a dependable AS0 detector type limiter protection circuit.
CONTROL AMPLIFIER SECTION
1. Can type, dual low-noise operational amplifier ensures low distor-
tion and high stability characteristics that are truly outstanding.
2. A DEFEAT switch is provided in the tone control circuit which
permits sound quality and acoustic compensation control, without
which
a truly flat response is difficult due to circuit element
characteristics.
3.
Convenient tape monitor and tape dubbing switches are provided.
They enable listening to records or an FM broadcast while simul-
taneously dubbing
a tape, and permit checking the recording, as
well.
4. 4 CHANNEL OUT-IN connectors are available. When desired
an adaptor or
a demodulator can be connected to them to trans-
form this unit quickly into
a Front or Rear Premain amplifier
in
a 4-channel system.
OTHER SECTIONS
1.
Both Low and High Cut Filters (6dB Octave) are available to
prevent noise entry.
2.
Inputsfor practically any possible arrangementof program sources
are available:
2 pairs of PHONO and TAPE PLAY, and inputsfor
TUNER, AUX and 4CH-IN.
3.
Two sets of Stereo Speaker Terminals and Front Panel Speaker
Selector Switch permit operation of speakers in two separate
rooms simultaneously or separately.
4.
Lever-type Muting Switch permits instantaneous silencing dur~ng WARNING: TO PREVENT FIRE OR SHOCK HAZARD, DO NOT
telephone calls, etc. EXPOSE THIS APPLIANCE TO RAIN OR MOISTURE.

INTERCONNECTING DIAGRAM
A SPEAKER SYSTEMS
B SPEAKER SYSTEMS
TAPE DECK
AM-FM STEREO TUNER
To SPEAKERS
Terminals
RECORD PLAYER
To
AC OUTLET
, For details of "4-CHANNEL"
! refer to page 7.
CASSETTE DECK

CONNECTING YOUR KA-4006
SPEAKER CONNECTING AND SPEAKER SWITCH
In connecting only one set of speakers, connect the right speaker
to right terminals and left speaker to left speaker terminals of
"A"
speaker terminals. Should plus or minus of either rightor left channel
be reversely connected, sounds at the center section will be adversely
affected by lack of separation. To connect a second set of speakers,
connect right speaker to right speaker terminals and left speaker to left
speaker terminals of "6" speaker terminals.
Sound cannot be heard when the SPEAKERS switch on thefront
panel is set to the A+B position, when only one pair of speaker system
is used with connections made either to "A" SPEAKERS terminals or
"6" SPEAKERS terminals. When connecting the speaker leads to the
SPEAKER terminals, make sure that the bare wire strands at the ends
of the speaker leads don't touch each other or adjacent terminal.
It is recommended that the tips of the speaker cord leads are
soldered, or the strands of each individual lead twisted together to
eliminate any possibility of short-circuits forming in the speaker con-
necting network.
1 CONNECTION TO SPEAKER TERMINALS I

CONNECTING YOUR KA-4006
TUNER CONNECTION
Use the TUNER terminals for connection to an
FM stereo or
AM-FM stereo tuner.
Connect the left channel of the tuner to the "L" TUNER input
jack, and the right channel of the tuner tothe "R" TUNER inputjack.
RECORD PLAYER CONNECTIONS
Connect the left channel of the record player tothe "L" PHONO
1 input jack, and the right channel to the "R" PHONO 1 input jack.
If an additional record player
is used in order to operate two
record players, connect the left channel to the
"L" PHONO 2 input
jack, and the right channel to the "R" PHONO
2 input jack.
If the record player has a grounding terminal, connect
it to this
amplifier's GND terminal to prevent hum.
DIN CONNECTOR (RECIPLAY CONNECTOR)
If your tape recorder is equippedwith a DIN type 5-pinconnector,
connect
it to the RECIPLAY connector with a DIN connecting cord.
A DIN connector enables recording and playback withthis single cord.
When a DIN cord
is used for connecting to the tape recorder, the
PLAY and RECjacks should notbe used. For highest fidelity recording
and playback sound however,
it is recommendedthat the tape recorder
be connected to the PLAY and REC jacks instead of the DIN con-
nector.
CONNECTION FOR ADDITIONAL TAPE RECORDER
If an additional tape recorder is used and two tape recorders are
operated simultaneously, the same connections must be provided for
B TAPE jacks.
CONNECTIONS FOR TAPE RECORDER AUX (AUXILIARY INPUTS)
RECORDING
A tape recorder can be connected as follows for recording.
Left channel inputof the tape recorder toA TAPE
"L" RECjack.
Rightchannel inputof the tape recordertoATAPE "R" RECjack.
PLAYBACK
A tape recorder can be connected as follows for playback.
Left channel output of the tape recorder to A TAPE
"L" PLAY
jack. Right channel output of the tape recorder toA TAPE "R" PLAY
jack.
When a tuner, tape recorder or other unit is connected here,
it
must have an out~utof at least 150 mV.
AC OUTLETS
The AC outlets on the rear panel of the amplifier may be used
to supply power to other components such as a record player, tape
recorder, etc.
1. SWITCHED outlets
These outlets are controlled by the POWER switch on the front
panel. (Thetotal capacity is 100 watts maximum.)
2. UNSWITCHED outlet
This outlet
is available at all times. (The capacity is 200 watts
maximum.)

CONNECTING YOUR KA-4006
4-CHANNEL INPUTS AND OUTPUTS
When
it is desired to set up a 4-channel stereo system, connect
another decoder-amplifier or demodulator to the 4-CHANNEL OUT-
PUT INPUT jacks
at the rear of this unit. It must be remembered,
however, that
a 4-channel program source is necessary for such opera-
tion. (See Fig.)
With
a 4-channel stereo system thus set up and the NORMAL-
SEPARATE switch of the KA-4006
set to SEPARATE position.
(See Fig.)
Stopper Plate
NORMAL
- -
SEPARATE
To change switch position. remove stopper plate.
Switch the slide switch and reattach piate to the
other side.
How to Replace NORMAL-SEPARATE
Switch
FRONT
I -u
REAR
--
mJ
-
SPEAKER
DEMODU- LATOR
, ,,u,.,
SPEAKER
OUT IN
-
PRE-MAIN AMP
+Q
DECODER MAIN-AMP
__ _... _ .___.___ _ ._.__. _-_._ ---- 3
REAR
DECODER-AMPLIFIER SPEAKER

CONTROLS AND THEIR FUNCTIONS
POWER witch LOW and HIGH FILTER LOUDNESSconaol
nected to the A SPEAKERS
terminals on the
rear panel. which may interfere with
B - Activates speakers con-
program material. LOUDNESS controlcompen-
nected to the
B SPEAKERS HIGH FILTERSettingthis rater for this deficiency.
terminals
on the rear panel. switch to
on reducer any high
A+B
- Activates rimultane- frequency noire such
as tape
OU~Y ~WO sets of speaker ryr- his, record scratch. etc.
temr connected tothe A and
B SPEAKERS terminals. wiredecreases
it. Tone is flet
Generally, these switches at center (zero) position.
should
be used only when MUTING witch
TREBLE control This switch reducer volume
level momentarily
ar during
at center
(zero) position. UME control. Setting this
witch to
off returnsvolume
level to original level.

OPERATING INSTRUCTIONS
AM-FM RECEPTION
1. Set the INPUT switch to TUNER.
2. Set the MODE switch to STEREO and the TAPE MONITOR
switch to SOURCE.
3. Adjust the VOLUME control to the desired listening level.
4.
Use the BASS, TREBLE, FILTERS and LOUDNESS controls to
adjust sound as desired and to match the acoustic conditions of
your room.
PHONO OPERATION
1.
Two pairs of phono input jacks, PHONO 1 and PHONO 2, are
provided to enable connections to two record players. To repro-
duce the output of the record player that is connected to PHONO
1 jacks, set the INPUT switch to PHONO 1. To reproduce the
output of the record player that is connected to PHONO
2 jacks,
set the INPUT switch to PHONO
2.
2. Set the MODE switch to STEREO and the TAPE MONITOR
switch to SOURCE.
3. Adjust the VOLUME to the desired listening level.
4. Use the BASS, TREBLE, FILTERS and LOUDNESS controls to
adjust the sound to your preference and to the acoustic condi-
tions of vour room.
TAPE RECORDER OPERATION
TAPE MONITORING
If you use the KA-4006with 3.head type tape recorders, you can
check the sound qualityof the recording that is being made by momen-
tarily comparing the recorded signal with the source signal as follows.
Set the TAPE MONITOR switch to A (or B) to monitor the recorded
sound. Set the TAPE MONITOR switch to SOURCE to monitor the
source signal before it is recorded.
When Recording With One Tape Recorder
Connect the tape recorder to either the A TAPE jacks or B TAPE
jacks on the rear panel.
RECORDING
1. Set the INPUT switch to the desired program source. Set the
TAPE DUBBING switch to SOURCE. To monitor the recording,
set the TAPE MONITOR switch to A or B, whichever side the tape
recorder is connected.
2.
Recording level should be adjusted with the volume control of
your tape recorder.
3. Recording is not affected by the VOLUME, BASS, TREBLE,
FILTERS, LOUDNESS, etc., controls of the amplifier.
Simultaneous Recording With Two Recorders
Connect one tape recorder to A TAPE jacks and the other to
B TAPE jacks on the rear panel.
RECORDING
1.
Set the INPUT switch to the desired program source.
2.
Set the TAPE DUBBING switch to SOURCE.
3. Recordings can now be made into both tape recorders simul-
taneously. To monitor these recordings, use the TAPE switch
as follows. Set ittoA to monitor the recording being madewith
the tape recorder connected to A TAPE jacks. Set
it to B to
monitor the recording being made in the tape recorder connected
to BTAPE jacks.
4. Recording levels should be adjusted exactly
as described previ-
ously for single tape recorder operation.

OPERATING INSTRUCTIONS
PLAYBACK
1.
The INPUT switch can be at any position.
2.
Set the TAPE MONITOR switch to the corresponding position
(A or B).
3.
Adjust volume and tone quality.
DUBBING
Tape recordings may be easily duplicated from one tape recorder
to another with minimal loss of quality by setting the TAPE switch to
DUBBING (A
b B) or DUBBING (B *A) as follows:
1. The INPUT switch can be at any position.
2. Set the TAPE switch to DUBBING (A b B) when it is desired to
copy recorded material on the tape recorder A for re-recording on
the tape recorder B.
Set the TAPE switch to DUBBING (B +A) when
it is desired to
copy a recording on the tape recorder B for re-recording on the
tape recorder A.
The recording can be monitored.
3.
Operate both tape recorders simultaneously.
Moreover, this unit permits listening to other program sources
such as an FMbroadcastor recordswhile tape dubbing.
FM broadcasts can be tape recorded while simultaneously listen-
ingto records
as follows:
1. Connect the Tuner to the "PLAY" jacks of the A TAPE group
connector jacks on the rear panel of this unit, and the Tape Deck
tothe BTAPE group connectors.
2. Connect the Turntable to either PHONO 1 or PHONO 2 and set
the INPUT switch to whichever connector that
is used.
3. FM broadcasts can be recorded when the TAPE DUBBING
switch
is then set to A L. B and the Tape Deck operated inrecord-
ing mode.
4. Disc record sound is reproduced when the TAPE MONITOR
switch
is set to SOURCE.
5. FM broadcasts are reproduced when the TAPE MONITOR switch
is set to A. The recordedsound of FMbroadcasts are reproduced
and can be monitored when the TAPE MONITOR switch
is set
to B.
Disc record sound sources can be tape recorded while simultane-
ously listening to FM broadcasts
as follows:
1.
Connect the Tuner to the "PLAY" jacks of the A TAPE group
connector jacks on the rear panel of this unit and the Tape Deck
to the B TAPE group connectors.
2.
Connect the turntable to either PHONO 1 or PHONO 2, and set
the INPUT switch to whichever connector that
is used.
3.
Set the TAPE MONITOR switch to A and tune in an FM broad-
cast.
4.
Set the TAPE DUBBING Switch to SOURCE and the Tape Deck
to recording mode. The sound from the disc record can then
be recorded.
5. The FM broadcasts are reproduced when the TAPE MONITOR
switch
is then set fd A. when it is set to SOURCE the sound of
the disc record will be reproduced. When
it is set to B the tape
recorded sound of the disc record can be monitored.

MAINTENANCE
CONCERNING TRANSISTORS
Transistors differ fundamentally from radio vacuum tubes and
require special attention to ensure their full performance capabilities.
Given proper care, transistors will provide years of practically trouble-
free performance.
(a) Avoid locations subject to direct sunlight.
(b) Avoid high or low temperature extremes.
(c) Keep the amplifier away from heat radiating sources.
PROTECTION CIRCUIT
The newly developed protection circuit
is completely effective
and prevents damage which may be caused by short-circuiting at the
speaker terminals or the power output circuit of the amplifier. When a
short-circuit occurs, this protection circuit will function automatically
to protect the power output transistors and the speakers. If the power
output transistor fails, this protection circuit will function automat-
ically to protect the speaker.
ACOUSTIC FEEDBACK
Occasionally a disturbing howling sound caused by acoustic feed-
back, may be heard. This
is generally caused by the relative positions
of the turntable and speaker enclosures. The sound pressure radiated
from the speaker box surrounds and vibrates the turntable. This vibra-
tion is picked up by the cartridge, sent tothe amplifieras an electrical
signal, and returned to the speaker. This again causes the speakers to
radiate vibration which induces sympathetic vibrations inthe turntable
and cartridge. Sympathetic vibrations are reinforced with each repeat-
ing cycle and result inan undesirable sound called oscillation or "howl-
AC VOLTAGE SELECTION AND POWER FUSE
The KA-4006operates on 110
- 120volt AC or 220 - 240volt AC.
The AC Voltage Selector Switch on the rear panel is set tothevoltage
that prevails in the area to which the amplifiers are shipped. Before
operating this amplifier, make sure that the position of the AC Voltage
Selector Switch matches your line voltage. If not,
it must bechanged
to the proper setting.
To change, first disconnect the AC line cord. Then remove the
stopper plate and slide the AC Voltage Switch to the opposite side.
Then reattach the stopper plate to the other side.
NOTE:
Our warranty does not cover damage caused by excessive line
voltage due to improper setting of the AC Voltage Selector Switch.
inq". To ~revent it, kee~vour turntable awav from "our speakers. I =,nnno. ds,&. I
AC VOLTAGE SELECTOR SWITCH
. .
A~O mounting yourturntable on shock-absorbing pad; may help.
",",+", ",-.-
1. Remove screw and stopper plate.
2. Switch lever to oppasite side
3. Lock lever by attaching stopper
plate to opparite side screw.
110-IZOV4b220210V 110-120V4b220-240V
I IZOV4, l20Vl 1120~4,220~1
I )is European type.

KA-4006 SPECIFICATIONS
MAIN-AMPLIFIER SECTION
Power Output 34 watts per channel, minimum
RMS at 8 ohms from 20 Hz to 20
kHz with no more than 0.5%Total
Harmonic Distortion.
Both Channels Driven
35 watts per chaonel into 8 ohms at 1,000 Hz
48 watts per channel into 4 ohmr at 1.000 Hz
Each Channel Driven
40 watts per channel into 8 ohms at 1,000 Hz
56 watts per channel into 4 ohms at 1.000 Hz
Dynamic Power Output
95 watts into 8 ohms
145 watts into 4 ohms
Total Harmonic Distortion
O.Q5%at % ratedpower into8 ohms at 1,000 Hz
Inter Modulation Distortion
0.5%at rated power into Bohms
(60 Hz: 7 kHz=4: 11
0.08% at X ratedpower into 8 ohms
Power Bandwidth
8 Hz - 45 kHz
Signal to Noire Ratio l10dB
Damping Factor
32 at 8 ohms
Speaker Impedance
Accept 4 ohms to 16ohms
Frequency Response
Phono
1.2
Tuner, AUX. Tape Play
Tone Connolr
Bas
Treble
Loudness Control
(-30 dB1
Low F~lter 80 Hz
High Filter 7 kHz
RlAA Standard CUNe
10 Hz - 40,000 Hz
GENERAL
Switches
Speaker Selector OFF
-A, 8. A + B
Input Sele~mr
Phono 1, 2, Tuner. Aux
Mode Stereo - Mono
Funn~on
Muttng. Defeat, Low HI-Filter. Loudness
PRE-AMPLIFIER SECTIOK
Tape Monitor
A, B, Tape Oubbtng A + B, B + A
Others Phones jack
lnput Sem~tnv~tyand Impedance AC Outlet
Swrtched 2. Unsw~tched 1
Phono 1 2.5 mV 50 k ohms Power Consumption 140 watts w fukl power
Phono 2 2.5 mV 50 k ohms 15 watts at no Slgxal
Tuner t50 mV 50 k ohms
Dimenrnonr
W 17.118" (435rnmb H 6-3/16" (157mml.
AUX 150 WV 50 k ohms D 12" 1306mml
Tape Play A. B 4 CH 1N 150 mV 50 k ohms
Weight
24.2 lbr (11 kg)
Msxtmum lnput Voltage lrmrl
Phono
1. 2 140 mV T H 0 0 5% at 1.000 Hz
Slgnal to Noise Ratio llHF A CURVE1
Phono
1. 2 76 dB
Tuner
90 dB
AUX 90 dB
Tape Play A. B 4 CHIN 90 dB
Output Voltage and Impedance
Tape Rec.
A. B (Pin) 150 mV 50 ohms
(DIN Connector) 40 mV 70 k ohm
4 CH OUT 150 mV 50 ohms

TROUBLE SHOOTING
In initially installing this amplifier improper connections toatuner or record
player may result in one of the following indications of trouble. Their possible
causes and corrective measures are listed below to facilitate installation.
INDICATIONS
No pilot lamp indication, no sound although AC Poor AC plug connection. Check ~luocontact.
is switched ON.
No sound from LEFT and RIGHT, SPEAKERS switched to A
+ B position.
.-
Both A-B groups of speakers are reouired in this case.
Sound only front one side.
Speaker cords disconnected. Check connections from amp. output to speakers.
SPEAKERS switched to OFF. SPEAKERS switch should be switched to OFF only
when using stereo headphones.
Volume Control at
0 (Extreme left). Set to appropriate volume level.
TAPE MONITOR switch at A (or 6). Always set to SOURCE except when using tape record-
ers.
4 CHANNEL NORMAL-SEPARATE switch at Always set to NORMAL except when using together
SEPARATE position. with
4 channel system.
Poor speaker cord connections. Check amp. outout and speakers connections.
BALANCE control set to one extreme or other. Adiust BALANCE control.
Unbalance results when volume is lowered. LEFT RIGHTresistor values unbalanced. Adiust BALANCE control.
Difference involume level of radio and phono. Difference in received signal and phono output Set to appropriate volume level
levels.
No sound from LEFT and RIGHT, or sound only Player output disconnected. See that player output cord
is firmly plugged into amp.
from one side.
- ~~
Loud hum drowns out sound. input.
-
Poor Player output cord prong connections. See that player output cord is firmly plugged into amp.
input.
Sound audible but background hum occurs. Player output cord picktng up humfrom AC cord. Keep player output cord away from AC cords.
Choose cord paths which keep hum at a minimum.
Twist LEFT RIGHT player output cords together.
Reverse player AC plug connections.
- ~~ p~ -
Player not grounded.
-~ ~~
~- ~
Connect player ground wire to GND terminals.
sound audible but continuous background buzz TV signal picked up by player output cord. Route player cord so buzz hum is minimized.
interferes. Frequently occurs near TV transmitting antenna.
-
Howling noise occurs when volume is raised or Speaker vibrations induce feedback in pickup. Increase distance between player and speakers.
bass response is increased. Choose speaker locations carefully. Remember, loose
flooring induces howling.
-~