Pioneer qx-8000 User manual

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FEATURES
FOUR.CHANNEL OUADRALIZER CREATES
,,ACOUSTICAL FIELD "
The latest advance in sound realism: The exclusive
Pioneer Ouadralizer creates an all-encompassing four-
channel sound field, giving you the full, life-like sensation
of being in an acoustically designed concert hall.
CHOICE OF TWO OUADRALIZING EFFECT
SYSTEMS
The Ouadralizer creates 4-channel sound from any 2-channel
stereo source (Tape, disk, FM). Moreover, it gives you a
choice of two totally different 4-channel effects:
ln "Matrix" operation, it builds up a room-enveloping sound
field without specified instrument locations. Switched to
"Phase Shift" operation, it produces normal, transparent
two-channel stereo sound from the front speakers, and then
adds a phase-shifted "wall of sound" with slight echo effect
through the two rear speakers. An exclusive, original Pioneer
development that preserves full stereo transparency while
giving you that sensational life performance feeling.
ALSO WORKS AS STANDARD 2-CHANNEL
STEREO RECEIVER
lf you only have one pair of speakers now, you can use
the OX-8000 as a regular 2-channel stereo receiver and
add the other two speakers at a later date.
PERMITS 4-CHANNEL OR 2-CHANNEL TAPE
RECORDING
lf you already own a 2-channel stereo tape deck, you can go
on using it for recording and playback as before. However, if
you plan to buy a 4-channel tape recorder, you can use the
Ouadralizer's full 4-channel capabilities, making your own
"quadralized" tapes from 2-channel source material, and
playing back 4-channel pre-recorded tapes with true 4-
channel sound.
FULLY EOUIPPED WITH 4.CHANNEL AUX.
ILIARY CONTROLS AND INPUTS
There are three balance controls: front left-right balance, rear
left-right balance, and front-rear balance. These give you
complete control over the quadralized sound field. Also.
separate stereo headphones for the front and rear channels
are provided-important when monitoring 4-channel tape
recordings. Other features include "speakers in operation"
indicator lamps, program indicator lamps, loudness switch,
high and low filter switches, FM muting switch, 300S1 and
75O (coaxial) FM antenna terminals, and a 5- position
channel mode selector.
VERSATILE TAPE-TO-TAPE DUPLICATING
FACILITIES
2-channel stereo tapes can be quadralized and dubbed onto a
4-channel tape deck (by using the preamplif ier outputs). Nor-
mal 2-channel tape-to-tape dubbing is possible too, as well as
4-channel tape-to-tape dupl icating.
CIRCUIT CONSTRUCTION
rer.eoEIpPED FM TUNER
The FM tuner is equipped with an FET in its front end to
improve selectivity and sensitivity. Also, the lF stage
employs one hybrid and one monolithic lC, replacing
numerous transistors, ceramic filters, etc., and raising the
tuner's sensitivity and selectivity. The FM MPX decoder
works according to the time switching system and boasts ex-
cellent channel separation. Tuning is made easy by the linear
FM dial and the double (signal strength and center zero)
tuning meters.
BUILT.IN AM FERRITE BAR ANTENNA
Sensitive and highly directional. An outdoor AM antenna is
not required in most cases.
LOW-D ISTORT ION, HIGH-POWER AUDIO
AMPLI FI ER
Both tone controls and equalization amplifier operate with a
generous amount of negative feedback for improved fre-
quency response accuracy and flatness. The power amplifier
is a quasi-complementary design, a tried-and-true circuit
construction.
ALL NEW "OUADRALIZED" EXTERIOR DE-
SIGN
Cabinet and control panels are visual symbolizations of the
Pioneer "Ouadralizer" concept, with a recessed, framed,
square tuning dial, a modernistic and logically arranged
control panel, and the famous silver-black-wood Pioneer
color styling.

LINE VOLTAGE AND FUSE
CHANGING LINE VOLTAGE SETTING AND FUSE
To remove the fuse, turn the fuse cap located on the line
voltage selector in the direction indicated by the arrow. Then
remove the fuse plug from the unit. Put the fuse plug back so
that the proper line voltage marking can be seen through the
cut in the edge of the plug. Whenever the position of the
selector is changed, check the rating of the fuse. A 1.5-ampere
fuse is to be used for either 220Y or 240V operation and a
S-ampere fuse for 110V, 120V or 130V operation. if the
rating of the fuse is correct, replace cap.
FUSE REPLACEMENT
If the fuse blows, remove the
fuse with a new one. fuse cap and replace the
TJIONEEFI
Fig. 1
4-channel stereo system, the QX-8000,
stereo receiver, can be combined with
tape decks, turntables, etc. as shown in
network (separately available Pioneer
installed as shown in Fig. 2, a 2-way
can be set up.
CARTRIDGE
TURNTABLE TAPE DECK TAPE PLAYER
TURNTABLE TAPE DECK CARTRIDGE
TAPE PLAYER
COMPOSITION A 4-CHANNEL STEREO SYSTEM
To compose an ideal
a solid state AM/FM
four speaker systems,
Fig. 1.
If electronic crossover
SF-500 or SF-700) is
multiamplifier system
PERFORMANCE OF QX.SOOO
4-CHANNEL STEREO PERFORMANCE
With a 4-channel stereo tape deck or cadridge tape player
installed, the QX-8000 can provide a 4-channel stereo
playback of programs recorded on tape.
4-CHANNEL STEREO PERFORMANCE OBTAINABLE
FROM A 2-CHANNEL STEREO SOURCE
A 2-channel program source (a record, recorded tape, FM
stereo program, etc.) can be reproduced in a high degree of a
4-channel stereo performance by either MATRIX system or
PHASE SHIFT system through the provision of QUAD-
RALIZER circuit in the QX-8000. For this 4-channel stereo
performance, two speaker systems must be installed in the
front and two speaker systems in the rear.
For the QUADRALIZER circuit, see page 14.
2-CHANNEL STEREO PERFORMANCE
A conventional 2-channel stereo performance can be provid-
ed through an arrangement of two speaker systems in the
front; left-side speaker system (CH. 1) and right-side speaker
system (CH. 3).
A 2-way multi-amplifier system can be set up by installing an
electronic crossover network (see Fig. 2).
SPEAKER SYSTEMS
ELECTRONIC
CROSSOVER
NETWORK
(SF-7OO or SF-5OO)
Fig. 2

INSTALLATION
The fully-transistorized QX-8000 generates no
installing it, however, check the following points:
. The place should be well-ventilated, and
heat. When
free from
dampness and dust.
o The unit should not be exposed to the direct rays of the
sun.
. The place should be free from significant vibration, or the
surface should be level and stable.
A WORD ABOUT ROOM ACOUSTICS
The quality of reproduced sound varies according to the size
and shape of the room, the materials of walls, floor and
ceiling and the amount and arrangement of furniture. Too
harsh or "bright" a sound usually results from too many hard
reflecting surfaces, and/or too low a ceiling. This condition is
improved by having ample carpet area or covering the wal
(especially that facing the speakers) with a thick curtain.
On the other hand, too many absorbing surfaces will tend to
"soak up" the sound, resulting in a certain "deadness"
Furniture may be rearranged to provide irregular reflection of
the sound. In any event, the true stereo effect is lost if the
two speaker systems are placed too far apart. This may be
corrected by angling them slightly toward each other or
reducing the distance between them.

TJIONEEFT
Two speaker systems are positioned in
front and two speaker systems in the rear.
Three speaker systems are positioned in
front and one speaker system in the rear.
All four speaker systems are positioned in
the
the
the
ts
AS
The rear speaker systems to suit your taste under your
room condition can provide a wide variety of free-
standing within the blue-tinted part as shown in this
figure. Fig.3
SPEAKER SYSTEM POSITIONS AND CONNECTIO N
TO SPEAKER SYSTEMS
SPEAKER SYSTEM ARRANGEMENTS
For an optimum 4-channel stereo performance, speaker
systems can be arranged in the following three different
ways:
2 - 2 system:
3 - l system:
4 - 0 system: front.
Since the QUADRALIZER circuit of the eX-8000
designed for 2 - 2 system, install four speaker systems
illustrated in Fig. 3.
Front left - Channel 1
Front right - Channel 3
Rear left - Channel 2
Rear right - Channel 4
NOTES: 1. For a better 4-channel stereophonic effect, it is suggested that
speaker systems in the rear be installed on a level a little higher
than the listening position.
2. When listening to a 4-channel program source, arrange the four
speaker systems as suggested for that particular program.
SPEAKER SYSTEMS
For the best 4-channel stereo performance, it is desirable to
use four speaker systems having the same characteristics.
Since it is difficult to meet this requirement, it is suggested
that speaker systems be selected and arranged as follows:
1. Select two speaker systems having the same charac-
teristics, and arrange them in the front.
2. select two speaker system having as identicar characteris-
tics compared with the front speaker systems as possible.
CONNECTION
1. Connect the leads from the speaker system to the speaker
plug as shown in Fig. 4. Make sure to connect the positive
(+) lead to the positive terminal of the plug, and the
negative (-) lead to the negative terminal. Then, confirm
that all connections are correct.
Connect the speaker plug for FRONT LEFT (CH. 1)
speaker system to the speaker socket CH. 1 on the rear
panel. Likewise, connect the speaker plug for FRONT
RIGHT (CH. 3) speaker system to the socket CH. g.
Connect the speaker plug for REAR LEFT (CH. 2)
speaker system to the speaker socket CH. 2, and the
speaker plug for REAR RIGHT (CH. 4) speaker system
to the socket CH. 4.
FRONT
FRONT LEFT (CH.1)
(LEFT SPEAKER) FRONT RIGHT (CH-3}
(RIGHT SPEAKER} ..:
at
r@
RE'AF: LE.FT (CH.2)
{LEFT.SPEAKER) pg4p 9161,11,:1c9 a|
(RIGHT.SIq,EAKEEJ .'
REAR
2.
D.
SPEAKER SYSTEM
Fig. 4

ANTENNA AND GROUND CONNECTIONS
FM ANTENNA
FM broadcast signals are attenuated somewhat by mountains,
buildings, and other obstacles. Therefore, even if a station is
nearby, a high gain antenna may be required. Select the
antenna in accordance with the following:
. If the receiver is to be located in a wooden building and
stations are nearby, use the T-type antenna which comes
with the QX-8000. As shown in Fig. 5, connect the
feeder terminals of the antenna to the FM antenna
terminals. Stretch out the antenna proper and secure it to
the ceiling or a wall in such a manner that pickup is
optimum, as determined by listening to the stations to be
received. Refer to "FM RECEPTION"on pagell.
. If orientation of the T-type antenna does not eliminate
background noise, connect an outdoor antenna to the
antenna terminals as shown in Fig. 6. In lieu of a special
antenna, a combination FM/TV antenna may be used.
NOTES: ' A number of FM antennas are available. Consult your sales dealer
for selection.
' ln locations adjacent to heavily traveled streets, around factories,
or near high-voltage power transmission lines, use oJ an FM
antenna may not give the desired noise attenuation. ln such cases,
consult you sales dealer concerning a coax cable feed (75 - ohm)
for the FM antenna. When coax cable is used, make connections to
the OX-8OOO as shown in Fig. 7.
AM ANTENNA
. Refer to "AM RECEPTION" page12. With an AM station
tuned in, position the ferrite antenna for optimum
pickup. See Fig. 8.
. When positioning of the ferrite antenna does not yield
satisfying results, stretch out the accessory AM lead
antenna and connect it to the AM antenna terminal with
the split lug. Keep the other end of the antenna lead as
high as possible.
. If use of the accessory lead antenna does not give
satisfying results, erect an outdoor antenna and connect
it as shown in Fig. 6. Special construction is not required:
Vinyl-insulated wire may be stretched between two masts
or other supports.
GROUNDING
. A ground lead may not be necessary for reception. Still,
when thinking about safety and elimination of noise, one
should be used.
NER
ONDUCT
+)
OUTER
IELD
(BRAID)
COAXIAL
CABLE
(75 - ohm)
AM LEAD
ANTENNA
Fig. 5
Strip the end of the
COAXIAL cable as shown
in A.
Loosen the screws shown
in B. lnsert the stripped
end of the coax cable.
Tighten the screws.
Fig. 7
FM T-TYPE ANTENNA
DIRECTION OF STATION

rJTON€ER
PREPARATIONS
1. The VOLUME control is set at MIN.
2. The MODE switch is set at 4 CH. STEREO.
3. The three BALANCE controls are all set at NORM.
4. The BASS and TREBLE controls are all set to FLAT.
5. The TAPE MONITOR switches (1, 2\ are set at OFF.
(The switches should be set at ON for a tape playback
only.)
6. The PRE & MAIN switch on the rear panel is set at
INTERCOUPLED.
CHECKING INTERACTION BETWEEN CHANNEL AND
SPEAKER SYSTEMS
1. Set the MODE switch to MONO L (CH.1), and play a
record or tune in a broadcast.
2. Turn the VOLUME control. Then, check all four
speakers. If any one of the speakers is not operating,
check the speaker connection.
Turn the FRONT-REAR BALANCE control fully
counterclockwise. Then turn the FRONT LEFT-RIGHT
BALANCE control knob fully couterclockwise and verify
only the front left-side speaker (CH. 1) is in operation.
After verifying it, turn the FRONT LEFT-RIGHT BAL-
ANCE control fully clockwise and verify that only the
front right-side speaker (CH. 3) is in operation.
Turn the FRONT-REAR BALANCE control fully clock_
wise. Then turn the REAR LEFT-RIGHT BALANCE
control fully counterclockwise and verify that only
the rear left-side speaker (CH. 2) is in operation.
After verifying it, turn the REAR LEFT-RIGHT BAL-
ANCE control ful1y clockwise and verify that only the
rear right-side speaker (CH. 4) in operation.
I-f anV other speaker than the proper one is operating
during the above verification test check the particulai
speaker connection. After the verification test, return the
three BALANCE controls to the NORM position, respec-
tively.
4.
5.

D.
ADJUSTMENT OF LEVEL BALANCE AMONG FOUR
CHANNELS
1. Set the VOLUME control to a normal level for your
listening.
2. Depress the REAR button of the speaker switches to
keep the speakers ( CH. 1 and CH. 3 ) in the front
operating. Turn the FRONT LEFT-RIGHT BALANCE
control in either way to balance the level between the left
and right speakers.
After the level balance for front speaker systems has been
adjusted, depress the REAR button once again to return
it to ON and depress the FRONT button to keep the
speakers (CH. 2 and CH. 4) in the rear operating. Turn
the REAR LEFT-RIGHT BALANCE controi in either
way to balance the level between the left and right
speakers.
After the level balance for the speaker systems in the rear
has been adjusted, depress the FRONT button once again
to return it to ON. Then, turn the FRONT-REAR
BALANCE control in either way to balance the level
between the speakers in the front and rear.
FM RECEPTION
1. Set the SELECTOR switch to FM AUTO.
2. Set the MODE switch to 2 CH. STEREO.
3. Push the FM MUTING switch down to ON. If a signal is
extremely weak, leave the switch kept to OFF.
4. Turn the TUNING knob to tune in the desired station
while watching the pointer deflection in the tuning
indicator. Best reception is cbtained when the pointer of
the lower meter deflects to the extrerne right, while the
pointer of the upper one indicates the center of the scale.
When the tuned-in FM station is broadcasting an FM
stereo program, the FM stereo indicator lights.
5. After the FM station has been tuned in, turn the
VOLUME control to increase the volume in the way you
want and adjust the BASS and TREBLE controls to
obtain the most pleasing tone.
6. When you want to enjoy the 4-channel stereo converted
from 2-channel progTam through the use of the QUAD-
RALIZER circuit, set the MODE switch to QUAD-
RALIZER and set the QUADRALIZER select switch to
either MATRIX or PHASE SHIFT. When an FM mono
program is received, set the MODE switch to 2 CH.
STEREO.
o If your area is far away from FM station or recep-
tion is noisy, setting the SELECTOR switch to FM
MONO may eliminate the noise. With the SELEC-
TOR switch set to FM MONO, an FM stereo program
is received as an FM MONO program.
NOTE:
lf you desire to take more accurate level balance
among speaker systems, use of a separately available
PIONEER Audio Display SD-1000 is recommended.
SD-1000. equipped with built-in oscilloscope and
audio oscillator, provides a high degree of versatility
in measuring {or easier observation o{ output waveforms
and in measuring output frequency characteristics, etc.
4.
I
I
;
11

AM RECEPTION
l.
2.
o
4.
1,
4.
2.
o
D.
TJIONEER
Set the SELECTOR switch to AM.
Set the MODE switch to 2 CH. STEREO,
Turn the TUNING knob to tune in the desired station
while watching the pointer deflection in the tuning
indicator. Best reception is obtained when the pointer of
the Iower meter deflects to the extreme right.
After the AM station has been tuned in, turn the
VOLUME control to increase the volume in the way you
want, and adjust the BASS and TREBLE controls to
obtain the most pleasing tone. 4-channel stereo perform-
ance by the QUADRALIZER remains no effect for AM
mono signal.
. If reception is noisy while FM or AM program is
being received,the interaction of antenna and ground-
ing arrangement may be responsible for the noisy
reception. Read the section "Antenna and Ground
Connection" on page 5 .
PLAYING TO RECORDS
1. When records are played by the turntable connected to
PHONO l jacks, set the SELECTOR switch to pHONO 1.
Likewise, when records are played by the tumtable
plugged into PHONO 2 jacks, set the SELECTOR switch
to PHONO 2.
2. Set the MODE switch to QUADRALIZER.
3. Set the QUADRALIZER select switch to either MATRIX
or PHASE SHIFT.
4. Turn the VOLUME control to adjust the volume in the
way you want, and adjust the BASS and TREBLE to
obtain the most pleasing tone.
NOTES: 1. lf 4 channel stereo records become avaitable, 4-channel stereo
playback of record will be possible with the MODE switch set to
4 CH.STEREO.
2. lf you want regular 2-channel stereo playback, set the I\4ODE
switch to 2 CH. STEREO.
USE OF CARTRIDGE TAPE PI-AYER
Set the SELECTOR switch to AUX 1. If the tape player
is plugged into AUX 2 jacks, set the SELECTOR switch
to AUX 2.
Set the MODE switch to QUADR ALIZEH.
Set the QUADRALIZER select switch to either MATRIX
or PHASE SHIFT.
Turn the VOLUME control to adjust the volume in the
way you want, and adjust the BASS and TREBLE to
obtain the most pleasing tone.
NOTE:
When using a 4-channel stereo tape player, set the
MODE switch to 4CH.STEREO.

usE oF TAPE DECK (OR TAPE RECORDER)
PLAYBACK
1. When using the tape deck plugged into TAPE 1 MON
output jacks, set the TAPE MONITOR switch 1 to ON.
When using the tape deck plugged into TAPE 2 MON
output jacks, set the TAPE MONITOR switch 2 to ON.
2. When using a 4-channel stereo tape deck, set the MODE
switch to 4 CH. STEREO. When using a 2-channel stereo
tape deck, set the MODE switch to QUADRALIZER, and
set the QUADRALIZER select switch to either MATRIX
or PHASE SHIFT.
3. Select the tonal quality you like best by means of various
controls, and control the volurne with the VOLUME
control.
RECORDING
As shown in Fig. 9, a live signal selected by the SELECTOR
switch is always appearing at TAPE 1 REC and TAPE 2 REC
jacks. Operate the QX-8000 as described in "LISTENING
TO RECORDS" and "FM or AM RECEPTION" on page 11,
NOTES: 1.The MODE switch, OUADRALTZER select switch, VOLUME,
BASS, TREBLE controls cannot control the signal appearing at
TAPE 1 REC and TAPE 2 REC jacks.
2. Control the recording level with the control knobs on the tape
deck.
3. When recording from 2-channel program source to the 4-channel
stereo, or when recording the signal controlled by the control
knobs of the OX-8000, connect the tape deck to PRE OUT.iacks.
. MONITORING
When a three-head type tape deck equipped with
monitor function is used, recording can be moni-
tored by operating the TAPE MONITOR switch if the
recording and playback connections are provided.
DUPLICATING OR EDITING OF RECORDED PRO.
GRAMS
You can make your own "Tape Library" by duplicating or
editing recorded programs, using two tape decks combined
with the QX-8000. For instance, you can record only music
you like from an FM stereo program recorded on tape.
1. Connect two tape decks as shown in Fig.10.
2. Set the TAPE MON switch 1 to ON, and reproduce a
recorded program by operating the tape deck connected
to TAPE 1 MON.
3. Record the playback in the way you want by operating
the tape deck connected to TAPE 2 REC (MON).
Operating the TAPE MONITOR switch allows you to
monitor a recording in progress.
NOTES: 1. Make sure to set the TAPE MONTTOR switch 1 to ON.
2. Recording with a PAUSE switch-provided tape deck will facilitate
duplicating or ed;ting of recorded program.
TAPE DECK 2
Fig.9
TAPE MONITOR TAPE MONITOR
SWITCH 1 SWITCH 2
TAPE DECK 1
LIN E
I NPUT
TAPE DECK 2
APE MONITOR SWITCH 1 rnpe MONTTOR
lmust be switched ON) SWTTCH 2
t3
Fig. 10
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QUADRALIZER CIRCUIT
With the Pioneer's exclusive QUADRALIZER circuit provid-
ed in the QX-8000, a 2-channel stereo program source can be
presented as a 4-channel stereo program in either MATRIX or
PHASE SHIFT system. You can select either system by the
QUADRALIZER select switch.
MATRIX SYSTEM
In this system, the left and right channel signals are converted
into four channel signals by means of the matrix circuit as
shown in Fig.ll. Signals appearing for each channel are as
follows:
CH. 1 (Front,left)
CH. 3 (Front, right)
CH. 2 (Rear, left)
2L+R
2P"+L
2L -R
2P"-L
TJIONEEFI
ox-8000
Fig. 11
-1" r :90'
Fig.72
CH. 4 (Rear, right)
As just described, right channel signal component is added to
the left channel signal, and left channel signal component is
also added to the right channel signal. The feature may
sacrifice somewhat stereophonic effect and separation, but
sound dispersion is excellent and vivid stereo effect will be
obtained. Therefore, this arrangement may be best suited for
reproduction of musical performance such as a quintet or of
popular music.
PHASE SHIFT SYSTEM
This system, newly developed by pIONEER, converts a
2-channel stereo signal into a 4-channel stereo signal. As
shown in Fig.12, the 2-channel stereo signal is reproduced
through both speakers (CH. 1 and CH. B) in the front.
Also, both left and right channel signals are applied to the
MATRIX circuit to obtain the signal difference,which is then
applied to the phase shifter to provide a phase difference of
90" between (L - R z-07) u.,a 1l - n LO2), Through this
arrangement, the signal (L - R /_ Ql is reproduced through
the left-side speaker (CH. 2) in the rear, and the signal (L - R
LQ2) through the right-side speaker (CH. 4) in the rear.
Since this system provides normal stereophonic sound dis_
persion in the front, and various sound are emphasized
through the speakers in.the rear, it may be best suited for a
high degree of reproduction of vocal solo or performance of a
full-member orchestra. etc.
PROGRAM
SOURCE OF
2 CHANNEL
STEREO
QUADRALIZER
SPEAKER SYSTEMS
ALIZER
G=) 7;lr I cH.4
TRIX Circuit
QX-8000
SPEAKER SYSTEMS

SETTING UP 2.WAY MULTI.AMPLIFIER SYSTEM
By combining separately available electronic crossover net-
work (SF-500 or SF-700) with the QX-8000, a 2-way
multi-amplifier system can be set up. Connect the crossover
network to the QX-8000 as follows:
1. Set the PRE & MAIN switch on the rear of the QX-8000
to SEPARATED.
2. Connect the input jacks of the crossover network to the
PRE OUT jacks of the QX-8000.
3" Connect the MAIN IN jacks (CH. 1 and CH. 3) to the
high-range output jacks of the crossover network.
4. Connect the MAIN IN jacks (CH. 2 and CH. 4) to the
low-range output jacks of the crossover network.
5. Connect the plug for the tweeter to the speaker sockets
CH. 1 and CH. 3, and the plug for the woofer to the
socket CH. 2 and CH. 4.
Noise: There are a variety of noises relating to the operation of
a hi-fi unit. These are generally divided into two types; (1)the
unit is faulty (a transistor or part has deteriorated) and (2) an
external source of noise is adding noise to the unit.
When a hi-fi unit produces an unpleasant noise, it is often
assirmed that the unit is faulty, but statistical records indicate
that the majority of noises produced in hi-fi acoustic units result
CONDITIONS FREQUENTLY MISTAKEN FOR MALFUNCTION
from external sources of noise. Due to the inherent high
sensitivity and the high fidelity in. reproduction, the unit
amplif ies and reproduces extraneous noises, however small, into
definite output noise. lf your receiver produces a noise, check
according to the following table and trace out the source of
noise for the appropriate corrective action.
SYMPTOM SUSPECTED SOURCE OF NOISE DIAGNOSIS AND REMEDY
F
o
o
o
o
tr
6
(9
=
z
IJJ
F
2
z
ul
!
=
Continuous or intermittent
noise like iiiijj or zzzzzz. . Static (lightningl
" Fluorescent lamp, motor, or thermostat
may be in use in house or in the vicinity of
the house.
ln many cases, it is very diff icult to remove the source
of noise. ln order to make the radio input larger than
the noise level, set up a good outdoor antenna and
make a complete grounding.
When a station is tuned in,
hum is mixed in the pro-
gram.
. Poor fluorescent lamp, motor, or electric
heater may be in use in house or near the
house.
Reversing the line plug may occasionally alleviate this
noise problem. Usually it is very diff icult to eliminate
the noise.
Hissing sound noise in AM
(medium wave) reception. . The frequency of an adjacent station is
interfering with that of the station being
tuned in (10 kHz beat interference).
. TV set is on in the same house with the
receiver.
lmpossible to remove such interference. lf the cause of
such noise is in the TV set, increase the distance
between the TV set and receiver.
Static noise (in particular
when automobiles run
close to the housel.
. White noise generated from automobile
engines.
. Radio frequency sewing machine or weld-
ing machine being used near your house.
ln an area surrounded by hills or high buildings, the
FM input signals are very weak. Thus the noise limiter
in the circuit loses its function. Set up an outdoor FM
antenna having many reflector elements.
Reception of FM stereo
program contains more
noise than FM mono pro-
gram.
. Note that the service area covered by an
FM stereo broadcast is about 5O% of that
of a regular mono broadcast.
lncreasing FM input signal may alleviate this problem.
Use an exclusive FM outdoor antenna instead of the
indoor T-type antenna.
(t)
o
cc
o
o
IIJ
tr
o
=
J
4
z
UJ
I
=
Hum or buzz. When
switched to radio recep-
tion, the noise disappears.
Poor connection of shielded wire (a).
Jack connection is loose. (b).
Line cord or f luorescent lamp is near the
shielded wire. (c).
Poor grounding. (d).
Ham transmitting station or TV transmit-
ting station is negr your house. (e).
correct the conditions stated in (a), (bl, (c) or (d). ln
case o{ (e), report it to an official activity.
Output tone quality is
poor and mixed with noise
Treble is not clear.
Stylus wears out. (al
Record wears out. (b)
Dust adheres to stylus. (c)
Stylus is improperly mounted. (dl
stylus pressure is not proper. (e)
The TREBLE level is too high.
Check (al through (e) and correct the condition.
Lower the TREBLE level.
15

TJTONEEfiT
SPECIFICATIONS
SEMICONDUCTORS
FET ............ 1
1Cs.............. 2
Transistors ..........................65
Diodes ..-:................. ............27
POWER AMPLI FI ER SECTION
Music Power Output (lHF) 180 Watts (4sl )
130 Watts (8o )
32W + 32Wl32W + 32W (4s} )
25W + 25Wl25w + 25W (8o )
25W x 4 (4o)
20W x 4 (8o)
21W + 21W (8s, Harmonic
Distortion Less than 1%)
Less than 1% (Continuous
power output)
Less than 0.2%
(20W + 2OW / 20w + 20W, 8o )
Less than 0.4Yo
(20W + 2OW I 2OW + 20W, 8a )
15 Hz to 80 kHz
(8o Harmonic Distortion
Less than 1%l
5 Hz to 100 kHz,13dB
lnputSensitivity/lmpedance 400mV/7Oko
(1 kHz, Continuous power output)
FM TUNER/FM MPX
Frequency Range
Usable Sensitivity (lHF)
Capture Ratio (lHF)
Selectivity (lHF)
lmage Rejection
lF Rejection
Spurious Rejection
AM Suppression
Signal-to-Noise Ratio
Harmonic Distortion
87.5MHz to 108MHz
2.2pY
3dB
More than 40dB
More than 50dB (98MHz)
More than 85dB (90MHz)
More than 80dB (98MHz)
50dB
60dB
Mono: Less than 0.6% (100%
Mod.)
Stereo: Less than O.8% (1OO%
Mod.)
Signal strength type and Cen-
ter Tuning type
Switchable to ON-OFF
More than 38dB (1 kHz)
More than 32dB
lmpedance 300s1 balanced
and 75o unbalanced.
525kHzto 1,605kH2
1 5pV
More than 25dB
More than 45dB (1,000kH2)
More than 30dB
More than 50dB
Built-in Ferrite Loopstick An-
tenna
110V, 120V, 130V, 220V
and 240V. (Switchable)
50-60H2
330 W (Max)
20" / 509mm (width)
6-314" / 172mm (height)
15-518" I 377mm (depth)
34 lb, 5 oz / 15.6 kg
40|b, 15 oz / 18.6 kg
AM Lead Antenna 1
FM T-type Antenna 1
Pin Plug 4
Speaker Plug 6
Fuse (1.5A) 1
Fuse (3A) 2
Polishing Cloth 1
Operatinglnstruction 1
SECTION
Continuous Power Output
(2 channel driven)
Continuous Power Output
(4 channel driven)
Power Output in the range of
20Hzto 2OkHz
(2 channel driven)
Harmonic Distortion
I nter Modulation Distortion
Power Bandwidth(lHF)
Frequency Response
Speakers
Damping Factor
PREAMPLIFIER SECTION
Output Voltage
Harmonic Distortion
Frequency Response
I nput Sensitivity/l mpedance
(1 kHz, for rated output)
Recording Output
BASS Control
TREBLE Control
LOW Filter
HIGH Filter
Equalization Curve
Loudness Contour
Hum and Noise (lHF)
4 to 16s,
35 (8,o 1 kHz)
400mV (Rated output), 2.5V
(Max.)
Less than 0.7%
10 Hz to 40 kHz, +3dB
PHONO 1 2mVl50ko
PHONO2 2mYl50,kst
AUX 1, 2 170mV/1 10ksr
TAPE MON ITOR 1, 2
180mV/120kn
TAPE REC 1, 2 (Pin jack)
170mV
-12d8, +i 1dB/100H2
-8.5d8, +10.5dB/1OkHz
-6.5d8/50H2 (6d B/oct.)
- 1 1.5d8/1OkHz (6dB/oct.)
PHONO: RIAA S.T.D.
+1 1 .5d8/1 00H2, +7 dB I lokHz
with Volume Control set at
-40d8 position.
PHONO More than 75dB
Tuning lndicator
Muting
Stereo Separation
Sub Carrier Suppression
Antenna lnput
AM TUNER SECTION
Frequency Range
Usable Sensitivity( I H F )
Selectivity(lH F )
lmage Rejection
lF Rejection
Signal-to-Noise Ratio
Antenna
MISCELLANEOUS
Power Requirements
Power Consumption
Dimensions (overall)
Weight Without package
With package
Furnished Accessories
NOTE:
Specifications and the design subject to pbssible modifica
tion without notice due to improvements.
TUNER, AUX More than 90dB
t6

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