Sansui-AU-70-Owners-Manual

OPERATING INSTRUCTIONS
& SERVICE MANUAL
STEREO CONTROL AMPLIFIER
SANSUI AU-70
SANSUI ELECTRIC COMPANY LIMITED
This amplifier has a maximum output of 50 watts (25W-25W)
and features an amazingly low distortion factor of not more
than 0.15% at 20W. A high-quality amplifier with many exciting features, it is delivered to you with Sansui's fullest confidence.
This booklet explains the steps necessary for operating and
caring for your new the. AU-70. Read an the instructions
carefully and retain for future use.
SUI
STEREO CONTROL
AMPLIFIER
AU-70
CONTENTS
FEATURES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SPECIFICATIONS .. . .. . .. . . . .. ... . . . . . . ... . . . ... ..... ........... .
CHARACTERISTICS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CONNECTIONS.......................................... .. .... ....
SWITCHES AND CONTROLS ........ ...... .......... .... .. .. ..
OPERATIONS.... ................ .. .. .... .. .. ......................
HINTS ON USE ................ .. .............. .. .............. ..
SERVICE NOTE ................ .......... ...... ...... ............
PARTS LIST ...... ...... .. ..... . ... . ........................ .... ..
SCHEMATIC DIAGRAM .......... ........ . .. . .......... . ...... .
PARTS LAyOUT ... . . . .. . ... . .. . ............ . .. .. ..... .. ..... . . . ..
3, 4
5
6
7, 8, 9, 10
11, 12
13, 14
15, 16
17, 18
19, 20, 21
22
. 23
FEATURES
7189A P.P. PRODUCES 40W WITHOUT
PISTORTION (MAX. 0.95% AT 30 CPS AND
·0.15% AT 1,000 CPS)
THREE-DIMEN SIONAL PERFORMANCE
POSSIBLE WITH CENTER-CHANNEL
OUTPUT TERMINAL
NFB USED IN ALL AMPLIFIER CIRCUITS ,
FROM PREAMP TO POWER AMPLIFIER
The low distortion of the power amplifier is
meaningless if the preamplifier generates distortions. Your AU-70 uses a three -stage amplifier
circuit in its intermediate or cpntrol amplifierunlike conventional one-stage control amplifiersand has all its circuits in a single negative -feedback loop. These make your AU -70 free from
noise and distortion.
The 7189A power tubes operate in class AB,P.P.
(fixed bias) Jor high-fidelity reproduction. Their
combined. maximum output is limited to 50 W .
The amplifier incorporates a multiplex feedback
circuit (total negative feedback: 26 dB) for the
first time in this class of amplifiers in Jilpan.
This makes it extremely low in distortion over
th e w h ole frequency range. Total harmonic distortion at 1 kc is 0.15%. At 30 cps, a very low
frequency at which it is extremely difficult · to
minimize harmonic distortion, the distortion is
limited to not more than 0.95%. This is quite
a feat for a 50-watt amplifier. Another remarkable
feature is the damping factor of 18, a figure which
is lower than that of triode power tubes' coupled
in P.P. This is why bass sounds come out with
such clarity.
SUPER-PRECISION TRANSISTOR PREAMPLIFIER ELIMINATES HUM AND NOISE
The exclusive Sansui four-transistor preamplifier,
which features a transistor circuit factor of 4-as
compared with conventional 5-1O-al1d a transistor
noise factor of 2 dB-as compared with conventional 5 dB, eliminates hum and noise, the enemy
of high -fidelity reproduction. The amplifier has
a much better SIN ratio and a gain three times
larger than vacuum-tube amplifiers.
Y~ur AU -70 has an ou tput terminal for th e
center-cha nnel amplifier.
Connect it to yo ur
monaural amplifier to produ ce a three-dimensional
effect.
BLEND CIRCU IT PERMIT CONTINUOUS
SHIFT FROM MONAURAL .TO STEREO
EQUIPPED WITH ADVANCED , HIGHPERFORMANCE ACCESSORY CIRCUITS
As you turn the "BLEND" sw itch clockwise,
your AU -70 gradually shifts from monaural to
stereophoni c repr~duction. This feature enables
you to get full stereophonic effect by compensating program sources which give a, particularl y
strong effect of the concert halL
Your AU -70 is equipped with various advanced
accessory circuits such as loudness control, low
and high filters, tape monitor, tone defeat, presence, blend, speaker sw itch a nd headphone jack .
EASY-TO-READ THREE-RAN GE OUT PUT
LEV EL METERS
EACH CHANNEL CAN BE OPERATED INDEPENDENTLY EQUIPPED WITH TONE
DEFEAT
Each channel has independent tone controls for
bass and treble. This makes fine adjustment
possible. Moreover, each channel is equipped
with tone defeat which cancels the tone control
circuits. You can easily obtain a flat frequency
response without causing any undulation in
response or redu ced gain in bass and treble as in
the case of conventional mechanical control by
means of a tone volume knob. Therefore, you
ca n get an accurate, perfectly flat response from
your AU-70 just by flipping a switch.
-
3
Each output level meter can be switched over to
a ny of the three scales of 5, 10 and 25 watts.
The meters not only give direct readings of both
channels, but also indicate any lack of balance
between the right and left outputs. These prove
ver y useful in balancing the outputs.
-
4
-
CHARACTERISTICS
SPECIFICATIONS
M AIN AMPLI FIER:
VACUUM TUBES, TRANSISTORS AND DIODES:
MAXIMUM OUTPUT: 25W-25W (SOW to tal)
HARMONIC DISTORTION :
Max . 0 . 15 % at 20W fo r 1, 000 Hz
Max . 0 .95 % at 20W for 30 Hz
INTER MODU LAT IO N
DISTORT ION :
1111
20
II)
~
w
10
z
'"
0
0
r-M~X
M~X
Max . 0 .85 % at 20W , (50 Hz
+ 5,500 Hz)
FREQUE NCY RESPONSE: 10-80,000 Hz at ±1 d B
OU TP UT IM PEDA NCE: 8 and 16 ohms
POWER CONSUMPTION:
DI MENSIONS:
GAIN AND SENSITIVITY:
PHONO : MAG 84 d B (Ou t put 20W at 1.1 mV in put)
WEIGHT:
'"
~ -
117V AC, 50 and 60 Hz:
150VA
W idt h 15" / 6 / ' .
Heig ht 5 19/ 3/ ' .
TAPE :
PHONO:
'"
I
I
10
10 K
IK
- - OU TPUT : I W
- - - - OU TPUT : 20 W
100
;;;~
0
lOO K
Q:
52 dB (at TAPE termin al)
Q:
,
LOW FILTER
0
"\.
5
II)
c
\
I
-- -,....
1
o I
10 K
IK
I NPUT AND OUTPUT CHARACTERISTICS
NART B (50p.s)
RIAA
5
ACCESSORY CIRCU ITS :
10
/'
I NPUT : MAIN
NF : 26 db LOAD
RESISTAN CE : 16 0HMS
15
20
25
I
I I I
I I
I
ez
/
...Q
:5...
-~
5
!!?
c
...
..."::::>
II
1
::::>
1
II
0
/
V
0. 3
5
10
15
20
I
I
2
10 and 25W
BLEND CONTRO L
-
~ "I..
-
5 .5 Ke +50 % LOAD RES IS TANCE I6 0HMS
10
25
10
., :'J
INTER MODULATION DISTORTION
I
-
I I
;::
...
!!?
HIGH FILTER
100
TAPE RECORDER PLAYBACK CONNECTION (DIN)
TERMINAL FOR CENT ER·CHANNEL AMPLIFIER
LEVEL METER (FOR OUTPUT) Thre e ra nges of 5,
I I
~Nt~t t~fE~T
0
- 30
PRESENCE CO NTROL: Turn o ver a t 150 Hz
LOW FILTER:
50Hz - 12 .5 d B
HIGH FILTER:
10, 000 Hz - 13 .5 dB
LOUDNESS CONTROL
TONE DEFEAT
TAPE MONITOR
HEADPHONE JACK
I I I
HARMONIC
I Ke
___ DISTORTION 100% ' LOAD RESISTANCE : 16 0HMS _ . - 10 Ke
ez
r-
- 1- -
w
"~ -20
I I
I J
10
10
5
10K
IK
HARMONIC DISTORTION
HIGH AND LOW FILTER CHARACTERISTICS
-
II 1111
I I 1111
30 lbs
below 0 .25 p.W
Ty pe NF
,
....... A
~ - 8
0:: -10
-12
MIN
100
0
EQUALIZER:
Z
~ - 6
-~
~ -1 0
Type CR
50 Hz + 11 to - 15 d B
10 ,000 Hz + 12 to - 13 dB
w en
..."...
Depth 12 19/ 32 /1 .
54 dB (O utput 20W at 36mV input)
TAPE : 86 d B (Ou tput 20W a t 0 .9 mV in pu t)
MIC:
86 d B (Ou tp ut 20W a t 0.9mV in pu t)
AUX : (TA PE MON) 51 d B (O utput 20W a t 50mV inpu t)
TUNER : 51 d B (O utput 20W at 50 mV in pu t)
T ONE CONTRO L:
~
1
x- TAL
RESIDUAL NOISE:
SIN RATIO
4
2
0
2
a;-
TONE DEFEAT
......
10
- 20
....
I 1 1111111
NF: 26 dB LO AD RESISTANC E : 16 0 HMS
6
~
:---....
"-
POWER SUPPLY:
FREQUENCYRESPONSECHARACTE~ST~S
TONE CONTROL CHARACTERITICS
7 189 A X 4 , 6A N8 X 2, 12AX 7 X 3, OA-91 ge rmanium
d iode X 2, 25B-381 tra nsis tor X 4, 50-1 B silicon d iod e
X 2 5 W- 0503 silico n diode x l
TOTAL : 9 t ubes a nd 9 di odes
6 -
CONNECTIONS
SPEAKER
nals of your amplifier to the ( - ) terminal of the
speaker.
STEREOPHONIC REPROD UCTION
THREE·DIMENSIONAL STEREO·
PHONIC REPRODUCTION
Connect (+) of the rig ht-hand speaker to the
8- or 16-ohm terminal of the upper R termina ls
on the back of the amplifi er. Connect ( - ) of
the rig ht-hand speaker to (C) of the upper R
terminals. Connect (+) of the left-hand speaker
to the 8- or 16-ohm terminal of the lower L
terminals on the back of the amplifier. Connect
(-) of the left-hand speaker to (C) of the lower
L terminals.
Your AU-70 is eq uipped with a termina l for a
center-cha nnel amplifier so that it can be used
for three-dimensional reproduction.
To do this, connect th e input terminal of a
monaural amplifier (Either a m a in or combination
amplifier can be used) to the pin-jack of the
center-channel output termina l at th e left of the
speaker terminal board with a shielded wire
The center- chann el mix es the right a nd left
so unds to produce the three-d im ensional effect.
Speakers suitable tor the AU-70 are 20 to 30-cm
coaxial s peakers and, for the best mu sical re pro-
MONAURAL REPRODUCTION
When you use an 8-ohm s peaker system for mona ural reproduction, connect th e upper and lower
16-ohm speaker terminals of your amplifier to
the (+) terminal of the speaker.
Connect th e upper a nd lower (C) s peaker term i-
~ 0 , O' 0' 0' '0' 0' 0
~;::..,/-~-~~
P,)\,]
1'-
=~~~
~ Q; O~ Q)
'L'~t::'
L'
.~c
duction, two or three-way speaker systems which
use different speakers for different fr equ ency
ranges.
In choosing the cabinet, take acco unt of ton a l
quality in ad dition to design.
CAUTION:
If yo u find that th e sound s from both s peakers
do not mix well, but leave a sort of vacuum
midway between the speakers, yo u can conclud e
that th e amplifier a nd the speaker s do not m a tch
in polarity (phase). In s uch a case, reverse th e
(+) and (-) co nnect ions of either speaker.
Wh en you use two pairs of speakers for stereo phonic r eprod uction, make sure th a t the speaker
output terminal connections do not ca use contact
between Rand L a nd that the terminals are
con nected properly. If th e connect ions are faulty,
your amplifier will not work normally a nd may
a lso go o ut of order.
RECORD PLAYER
1.
Connect the outp ut termi nals to the "PHONOR" and " PHONO-L" terminals (in the case
of mona ura l reprodu ction , to either of th ese
terminals) on the back of your amplifier with
sh ielded wires.
2. Set the cartr idge swi tch on th e back of your
ampli fier to "MAG" or "X -TAL" according
to the type of yo ur cartridge.
3. Connect the power- cord plu g of the player
to the power plug receptacle on the back of
yo ur am plifier.
MICROPHONE
Connect th e
terminals on
yo u use two
the other to
m icrophone to R or L of the "M IC"
the back of yo ur a mplifier. When
mi crophones, connect olle to Rand
L.
15
.;.\
0; C' Q; C
e
CARTRID GE SWITCH
Set this t o MAG or X·TAL depend .
ing on your p layer cart r idge
(ma gnetic or crystal)
i
-
7
-
Player (magnetic)
Player (c rystal)
, " Microphone
8
-
,
'.
CONNECTIONS
TUNER
Conn~ct
and L , respec ti\'e ly, o t th e " AUX" te rminal s o n
the back o f yo ur amplifi e r.
You can listen to broad casts easil y by c onnecting
your amplifi er to a tuner and MPX adapt or.
the tape recorder output termina l
("LINE") to Rand L (R or L in the case of
monaural operation ) of the "TAPE MON"
terminals on the back of your amplifier.
TAPE RECORDER
1. SINGLE-CONNECTION TAPE RECORDER
(DIN STANDARD SPECIFICATION ):
A) STEREO TUNER
Connect tun er output to th e Rand L " T L:N ER"
termina ls on th e back of yo ur am pi ifier.
8) MONAURAL TUNER
Co nnec t th e "in ,ld e-conn ec tion co nn ector to the
"TAPE-I\EC ' recep ta cle o n th e back of your
amplifi er.
Conn ec t tuner output to e ith er R or L of th e
" T e NER' - terminals on th e back of your a mplifi er.
2. PIN -JACK TA PE RECORDER
R ecord in g
Con nec t th e tape r el'orcie r input ternlin a is to R
a nd L (R or L in th e l'ase of m o na ural o perati o n) of th e "REC" termin als on th e bac k of
yo ur a mpli fier \\'i th shiel ded wires,
b) Pl ayback
3.
Con nect monaural tu ner o utjJut to th e input
termina l of th e F:\l-'\lPX adapt or a nc! co n nec t
R and L of the adaptor o utput termin als to R
e
•
o
CENTER
"CHANOllT
Ii rI Q
16"
Ii
fM TUN ER (B) or (C)
AM/ fM / MPX TUNER (SANSUI TU·70)
9
-
eQ
Playing tapes on the tape deck
Connect the tape deck output terminals to R
and L (R or L in the case of monaural operation) of the "TAPE HEAD" terminals on the
back of your amplifier.
4.
a)
C) FM MONAURAL TUNER AND
FM-M PX ADAPTOR.
Connect th e ta pe recorder input terminals to R
and L (R or L in the case of monaural operation) of the " REC" terminals on the - back of
your amplifier. Also, connect the tape recorder
output terminal " LINE" to Rand L (R or L
in the case of monaural operation) of the
" TAPE MON" termina ls on the back of your
amplifier.
Mon itoring with a t hree-head t ape recorder
a)
Single-connection tape recorder
Connect the single- connection plug to the
"TAPE-REC" receptacle on the back of your
amplifier.
b) Pin -jack tape recorder
It
•
C
~ ~
G).
MPX ADAPTOR (C)
o
CENTER" . .
"CHANOllT
Tape-deck
-
10 -
I~
..
Bll
D
Q •
~
~
G).
SWITCHES AND CONTROLS
CD POWER INDICATOR
CD
T h is lights up yvhen power is being supplied . It remains on whi le the amplifier
is in operation.
@ HEADPHONE JACK
When you want to avoid disturbing others
or wh en you use the ampl ifier as a monitor,
co nnect h ead phones to this jack . You
can still enjoy stereophonic reprodu ction
through the head phones. For this purpose, you ca n use a ny ty pe of headphones
or earphones if its plu g fits into the jack.
But use d yna mic headphones designed for
stereophonic reproduction, if possible.
HE"O PHON
®
POWER
@ SPEAKER (SPEAKER OFF)
When you use headphones with the headphone jack, set this switch to "OFF" to
cut off sound to the speakers. This feature
enables you to enjoy stereophonic reproduction without disturbing others.
@ PRESENCE
® TAPE MONITOR
Th e right and left meters indi cate th e out:
put levels of th e right and left speake rs,
respectively.
Since output is shown separately for each
channel , the meters provide easy balance
adju stment. Besides, you ca n watch changes
in th e output of each channel during operation . Each meter can be set to any of
th e three ranges of 5, 10 and 25 watts by
m ea ns of th e output- level meter switch on
the back of th e amplifieL Choose the
a ppropriat e range according to th e output
YOU wan t. \'-h en th e "MODE" sw itch is se t
io R (or L), t he meter for L (or R ) does
no t \york.
vVh en you mak e record in gs with a threehead tape record er, turn thi s sw itch "ON"
to use the am pIifi er as a mon itor. Then
th e sounds record ed on th e tape a re re prod uced while you are reco rding. Keep
th is sw itch " ON " when you play the tape
on the tape .recorder.
Be sure to keep th e ~\\"itch "OFF" oth erw Ise.
(J)
®
LOUDNESS
low-frequency noise)
® HIGH FILTER (for eliminating high-frequency noise)
@
@ POWER
ow
TER
This switch is used for connecting and
disconnecting the power supply. Push the
.button for poweL Push it again to shut
it off_ The switch a lso activates and deactivates the power-supply plug receptacles
on the back of the amplifieL
..
Turn thi s sw it ch "ON " to red uce rela tively
high-frequen cy noise, such as the scratch
from recorels made of poor materi a l or noise
du e to fluoresce nt lamps in th e case of
th e tun er.
@) TONE DEFEAT
Turn th is sw it ch " ON " to open the tone
co ntrol circuit s_ Then the frequency res ponse cur\'e of the amplifier wi ll become
perfectl y flat.
-
11
@ SELECTOR (input-selector)
TUNER : For receiv ing broadcasts
the tuner.
PHONO : For pla ying records.
MlC: For usin g a mi crophone,
TAPE HEAD : For pla ying tapes
tape c1 eck (directly from the tape
AUX : For reprodu cing \'oice input
th e MPX adaptor.
,
1
This knob permits continuous shift from
stereo phoni c to monaural reproduction .
Turn it co unter-clockwise to bring reprodu ction closer to monaural (R+L). For
complete mona ural r e produ ction, turn it as
far counter- clockwise as possible.
Th e so und s of th e righ t a nd left s peake rs
become sepa rat ed \"h en you turn the knob
cl ockwi se (R and L perform th e ir respective
fun ction s) . Th e best stereophoni c effect is
obtained wh en you turn it as far as possible_
@) BASS and
®
@
@ TREBLE for L
Th ese co ntrol th e tone of the left speaker.
@ BASS and
through
on the
head).
or usi ng
@ MODE (Stereophonic/
@ BLEND
.
Turn thi s 5w it ch "ON" to red uce phono"
motor and other unpleasa nt low-frequency
nOIses.
This knob is used to control the volume
of the tuner, records and tapes. Turn it
clockwi se for louder reprodu ction. To
redu ce th e \'01 ume, turn co un ter-clockwise.
Th is knob is used to adju st the balan ce of
volume between the right and left spea kers
for the best stereoph on ic effec t. J\,1 ake the
adjustment while watching th e o utput level
meters and listening to the so und s of both
spea kers . \\Then the a mplifier is adjusted
properly, yo u feel as if th e sound comes
from a point midway between th e two
spea kers.
@ LOW FILTER (for eliminating
@
@) VOLUME
@
@ BALANCE
\\-hen so und \'olume is at a low level , you
ieel as if bass a nd treble a re miss ing. In
such a case, turn this switch "ON" to
compensate bass and treble. Th is will
mak e you feel as if you were present at
a n ac tual co ncert,
If the Tone Control a lone is used for bass
com pensat ion, slightly higher frequencies
are compensated at the same time. To
avoid this, turn this switch "ON" _ This
sets the turnover at 150 cps, changing
speaker damping and frequency response
characteristi cs to compensate bass. As a
resu lt, all sounds become impressive and
you can enJoy clear, m ag nificent bass.
® OUTPUT LEVEL METERS
® TREBLE for R
These control the tone of th e right speaker.
-12 -
monaural switch)
Thi s switch is used to shift from stereophoni c · t6 mon a ura l r eprodu ction or vIce
versa.
STEREO : Set the sw itch at thi s posi tion
for stereo reproduction. Signals fed into
A come out of A's speaker and those fed
into B come out of B's speaker.
STEREO-REV : This position, too, is for
stereo reprocluct ion . But signals fed into
A come out of B's speaker a nd those fed
into B come out of A 's speak er. Choose
thi s positi on when the ri g ht and left are
re\'e rsed in reprodu ct ion.
L+ R: Signals fed into Land H. are bl ended
into one (L + R ) in the amplifier before
th ey co me out se paratel y from Land R .
Signals fed into A and 13 become A+B
in th e amplifier and come o ut of the
spea kers of A and 13 in the form of tb e
co mbined so und A+B.
R (Mon o R): S ig nal s fed into A come out
of A 's and B's spea ke rs. Use this position for reprodu cing mono broadcasts and
tapes.
L (Mono L): Signals fed into B co me out
of A's and B's spea kers.
This position is r arel y usecl .
OPERATIONS
RECORD PLAYING
BROADCASTS
Set the "SELECTOR" switch at " PHONO".
Set the "MODE" sw itch at " STEREO" or
"ST EREO- REV" (at R or L in case of monaural operat ion).
3. Sw itch on th e player, pu t on a record and
ad just the number of revolutions as necessary
before placing the pickup on the record.
4. Bala nce the so unds from both speakers by
mea ns of the "BALANCE" knob while watching
the output level meters.
.5. Adjust the amount of sound by means of the
"VOLUME" knob. Other adjusting knobs and
switches can be used to get the most satisfactor y repreduction.
When you play a monaural record on a stereo
reco rd player, follow the same procedure as
for stereo record s. This will give you better
results.
Catridges are either magnet ic or crystal. Both
can be used with the AU-70, but, if poss ible,
use a magnetic type for the highest fidelity.
If you feel that right a nd left are reversed
when play ing a stereo reco rd, turn the "MODE"
switch to "STEREO-REV". To balance th e
sounds from both speakers, play a m ona ural
record in the same way as a ste reo record and
adju st the "BALANCE" sw itch in such a way
that yo u feel th at th e sou nd comes from a point
midway between the ri ght and left speakers.
In this case, yo u ca n count on the output level
meters for a rough determin a tion of the bala nce.
Also, make sure that the "BLEND" knob is
kept at the point wh ere it cannot be turn ed
clockwise any further.
When yo u supply power to the player from
the power-plug receptacle on the back of your
amplifier, do not forget th at the player is sw itched off when you switch off th e amp lifi er.
In th e case of A a nd B above:
1. Set the "SELECT OR " swi tch at "TUNER".
2. Set the "MODE" sw itch at "STEREO" or
"STEREO-REV" in the case of A and a t R
or L (according to the cha nnel selected) in the
case of B.
3. Tune in with the tuner.
4. Use other ad justing knobs and switches to
get th e most satisfactory performance.
In the case of C
1. Set the "SELECTOR" switch at "AUX"
2. Set the "MODE" switch at "STEREO" or
"STEREO-REV".
3. Tune in with the tuner.
4. Prepare the FM-MPX adaptor for stereophonic
reception.
5. Use other adjustin g knobs and switches to
get the m ost satisfactory performance.
When you use a tune r or FM-MPX receiver, read
the instru ctions for them carefully. There should
be no mistakes in co nnections and operation.
When yo u usc our T U -70, follow the instructions
for A. Wh en yo u use an FM-tuner (without
Multiplex) and MP·2, foll ow the instructions for C.
1.
2.
-
USE A MICROPHONE
You can use microphones with your AU-70
amplifier.
Any high-impedance (50 kilo-ohm)
crystal, dynami c or velocity microphone is acceptable.
1. Set th e "SELECTOR" switch at "MIC".
2. Set the "MODE"
sw itch a t " STEREO"
(when you use only one microphone for stereophonic effect)
at R (wh en you use only one microphone for
monaural reprod uction),
or at L + R (when you mix two different pro13 -
gram sources from tw o microphones.)
During stereophonic operation, you ca n use
the "BLEND" knob for mixing purposes.
4. Other adjusting knobs and switches can be
used for the most satisfactor y re production.
Remember that your AU·70 accepts only highimpedance microph ones. You cannot get the
best performa nce if yo u use too long microphone cord, which causes \'ario us problems a nd
redu ces treble. ·
Your amplifier ha s sepa rate tone' co ntrols for
right and left speakers. You will find thi s
feature very useful wh en yo u use one microphone for music and another for vo ice. Further more, it gives added \, ersa tilit y to yo ur amplifier,
particularly when you record on tape what is
picked up by microph ones.
those ot th e sound from the speakers. Wh en you
record ' a broadcast cir record , you can obtain
better results by connecting the tape . recorder
directly to your amplifier instead of picking up
the sound fr om th e speakers with microphones.
3.
PLAYBACK
1. a) T ape deck
Set the "SELECTOR" sw itch at "TAPE".
b) Tape record er
Set th e " TAPE MONITOR" switch at "ON".
2. Set the tape recorder in the play position.
3. Other ad justin g knobs a nd switches can be
used for th e most satisfactory reproduction.
CAUTION
Whe n you use a Tape Recorder, keeping the
"TAPE MONITOR"sw itch at "ON" the "MODE"
sw itch is not operative.
If yo u want to use the "MODE" sw itch, connect
the recorder output to the "AUX" pin-jackson
the back of you r amplifi er and th e " TAPE MONITOR" sw itch a t off.
RECORD AND PLAY TAPES
Your AU·70 can be sed with a tape r ecord er
for recording and pl ayback and can also play
tapes on the tape deck. If yo u use a three·head
tape recorder which has separate record and
playback heads, you can make r ecordings while
listen ing to a reproducti on of the recordings. In
oth er words, your amplifier can be used as a
monitor which lets you know the quality of your
r ecord ings while th ey are being made ..
TAPE MONITORING
To use yo ur amplifi er as a monitor for a threehead tape recorder, follow the same proced ure as
the one for playing tapes on a recorder. Vvh en
you use a record er, read the instruction manual
carefull y to avoid errors in connection and operation.
U nl ess yo u use yo ur amplifier as a tape mon itor
or for playing a tape with a tape recorder, be sure
to switch off th e " TAPE MONITOR" switch.
Connecting a tape recorder can be done by
using either a single- connection connector or by
pin-jacks. The single-connection plug conforms
with German DIN standard specifications. It
makes it easier to connect the tape recorder
to your amplifier because it has a five-pin plug
for both record and playback. When you use
your amplifier as a tape moritor, turn on the
"TAPE MONITOR" switch if you want to hear
the sound you are recording.
RECORDING
Set the' "SELECTOR" sw itch at the proper
position according to th e program source (broadcastor record) you are going to record.
2. Set "MODE" switch at "STEREO" (for
stereophonic recording), at R or L (for monaural
recording), or at L+ R (for monaural recording
of a stereophonic source).
3. Prepare the tape recorder for recording.
4. Operate the recorder and amplifier adjusting
knobs and switches properly.
Amplifier adjusting knobs do not affect the level
and tonal quality of recordings, but only control
-
14 -
HINTS ON USE
SPEAKER POLALITY
up, it might go out of order.
If the phase (polarity, viz. +and-) of the right
and left speakers is not correct, sounds at the
center of the frequen cy ran ge become weak. You
will particularly sense an attenuation of bass. To
m ake sure that speaker polarity is all right, play
a monaural record on a stereo record playe r. If
the polarity is reversed you will have the result
mentioned above. In such a case, reverse the
polarity of either speaker. (Connect the - lead wire to +.) When both speakers are thu s made to
agree in polarity, you , will feel as if the sound
comes out of a single speaker placed midway
between th e right and left speakers.
CONNECTIONS
When you con nect you r amplifi er to a tape
recorder or tuner, be sure to use a n adequately
thick shield ed wires. If yo u use untwisted vinyl
cord like those used for lights, you will suffer
from hum. Furthermore, do not ,use a wire longer
th an 2 m eters (about 6.5 ft.), because the lon ger
the connecting wire is, the grea ter th e a ttenuation
of treble becomes. For con nection to a tuner or
FM adaptor, use a wire 1 to 1.5 meters (about
3.3 to 4.S ft.) long. When yo u use the amplifier
for monaural reproduction, it is eas ier for operation
to use th e upper R terminal for connection. Be
sure to set the "MODE" switch to the connected
channel.
FUSE
The a mplifier does riot work when the fuse is
bl own. In such a case, disconnect the power
cord and replace the fu se on the back of the
amplifi er~
Use a 3-ampere fuse encased in a glass
tube. Never risk the danger of usi ng fine wire
or a fu se of a larger ca pacity as a substitute. If
the fuse has burnt out beca use the amplifier is
out of order, locate the troubl e and repair it before
replacin g the fuse. The fuse , blows if you use
an AC plug receptacle larger than the' specified
·capacity (SO VA for two)_
HUM AND HOWLING
When you play a reco rd or tape, you may sometimes hear unpleasant humming or how ling. This
,does not mean th at your amplifi er is defecti ve.
In most cases, hummi ng or howlin g is a result
of these cau ses:
If you place a record player 0 11 or near th e
speaker box, the vibrations of the speaker cabinet
caused by the sound waves from th e speaker are
transmitted to th e player and cause h owling. To
prevent this, keep the record player away from
the speaker cabi net or put a thick cushion between the player and the cabinet.
A low, buzzing sound wjll also be produced if you
do not use shielded wires for connection. If this
is not the cause, ex am ine th e connections closely.
Make sure that the earth and live end~ are not
reversed so that the motor a nd arm a re inadequately grounded.
HEAT GENERATED BY AMPLI·
FIER
The top of the amplifier case becomes considerably
hot after many hours of continuous operation_
But this should not worry you because air vents
are provided on the top and back of the case.
If you place something on the amplifier or put
it in a closed box, or keep its front panel facing
-
16 -
Fig. 3
Fig . 2
Fig. 1
CONNECT LEADWIRES PRO·
PERLY
3. Not wet and dusty;
4. Not exposed to the sun;
5. Well ventilated.
Connect lead wires properly to the speaker and
other input a nd output terminals. If co nnections
are loose or touch other parts, yo ur amplifier will
not work properly. Moreover, it may produce
noi se. If you use your amplifier in such a way
for a long time, it may eve ntu all y break down.
Finally, read the instructions for your tuner or
tape recorder carefully before you co nnect it to
your amplifier.
LEVEL METER SWITCH
This is used to select the most suitable meter
sensitivity from the three ranges of 5, 10 and
25 wa tts. The variable sensitivity is intended to
mak e it eas ier to watch needle movement.
high: up to 5 watts
medium: up to 10 watts
lo\\' : up to 25 watts (maximum output)
Choose the appropriate range according to volume
level you want.
AC OUTLET
The AC OlJtlets on the back panel are connected
or disconnected by the power switch on the front
panel. The total capacity is SOVA-30VA and
another 50VA- Be sure to lise them within
the limit.
WHERE TO BE PLACED
The amplifier should be installed to the place as
given below:
1. Easy to ground;
2. Floor not vibrated;
-
16 -
SERVICE NOTE
Symptom
No power when power switch is
pushed on
What to Do
Probable Cause
1./ Defective power switch .
Replace .
2. Defective line cord .
Replace .
3. Loose contact between plug and socket or
defective plug .
Recondition or re place .
4. Blown fuse.
Replace .
Symptom
A . Distorted sound on AUX.
Probable Cause
1. Aged tube .
2. Short -c ircuit
What to Do
Check V ,~ V 9 '
In
output transformer .
Check and repair T z and T 3
3. Defecti ve loudspeaker.
Replace .
4. Defective record play er. adapto r or others.
connected to the unit.
Replace
l. Defecti ve record playe r . tape recorder or
o th e rs . connected to the unit.
Replace .
2. De fec ti ve tubular elect roly ti c capacito r.
Replace C, and/or C 2.
3. Di scon nection at fixed resistance .
Chec h R2 , ~ R az . R •. R ,a. R ... R 15 • R '6. R 17 • R 'B.
R '9. R zo . R 2, and R 22 .
l. Electrol y tic capacitor di scharged .
Check C a,. C66 ~ C' 3 . C76~C77'
2. Defec t ive tube.
Check
If again blown after replacing. check power
transformer (T, ) & path condenser (C s ,) in
power circuit for short-circuit.
B. Distorted sound on PHON O
and TAPE.
Power indicator is lit when power
switch is pushed on. but;
A. the unit does not work at all .
B . PNONO and TAPE does not
fu nction.
1. Defective tube.
Check V , ~ V 9 and silicon diodes.
2. Abnormal voltage in tubes and o ther parts .
Check voltage in tube and other parts and
replace. if necessary. If voltage is OK. check
AUX input circuit and hereafter.
1. Defective head amplifier (transistor section).
Rep lace transistor head amplifier unit.
2. Defective selector switch.
Replace or repair S2'20 and/or S 2e. S 2f
3. Loose contact or short -circuit between input
terminal and pin -jack .
Replace or repair.
4. Defective record playe r . tape recorder. or
others. connected to the unit.
Replace .
5. Defective coupling condenser .
C. Weak sound on AUX .
PHONO and TAPE .
A. Normal voltage at 'e ve ry part
but weak sound on AUX
A . Hum on AUX .
B . Hum on PHONO and TAPE.
I, Re place
1. Abnormal voltage in power circuit and
other parts.
C, and/or Cs.
Check and repair .
Check R ,,~ R ,s . R66~ R" and Compound part
CRS01. CRS02.
1. Defective fixed resistance .
A . Noise on AUX and TUNER .
2. Short -c ircuit in ou tput transformer.
Check C 2 ' ~ C Z" C a6 and C a, tubular electroly tic capacitor C 2, . C 26 . C. o. C" .
3. Discharged capacitor.
3.
Defec ti ve record pla ye r. ada ptor or others.
connected to the unit.
R ep lace.
4.
Hum balancer not properl y a dj uste d.
Check VR .. a nd VR ".
5. Disconnected NF resistor.
C heck RS2 and R s3 .
l. Defec ti ve shielded wire and/or wrong connection of record playe r. tape recorder or
others .
Replace a nd connect correctly
2. Audio system and shielded wire induced
f rom outside .
Keep prop e r di stance between audio system
and inductor.
3. Residual hum of audio sys tem connected
to the unit.
Replace or repair.
1. Fix ed resistor badly connected or touched
by a nother part .
. 2. Capacitor nearly short-ci rcui ted or touched
by another part.
4. Aged tube .
5. Defecti ve slide switch or selector switch .
V, ~ V 9.
Check C '6. C S7 • C 60 • C 6 , .
3. Primary coil of output transformer nearly
disco nnected.
Check T z and T a.
4. Defecti ve tube .
C hec k V, ~ V 9.
1. Fixed resistor defective or nea rly disconnected.
Check R 7~ R a2
2. Defecti ve capacitor.
Check C ,~ClO
3. Noise or bad connection of audio system
connected to the unit.
Replace or repair
---------------------+-----------------------------~-----------------------------
B. Normal voltage at every part
I
1. Defective selector switch .
Replace or repair S 2"
S JO
but weak sound on PHONO
and TAPE .
2. Abnormal input circuit :
between input terminal
defective shielded wire .
loose contact
and pin ·jack:
S20. S 2e. S zf. S ". and
Replace o r repa ir.
3. Defecti ve record play er. tape recorder or
others. connected to the unit .
Replace
4. Defecti ve coupling condenser.
Check C ,. C z• C,. C 6• C , . and Cs.
5. Discharged by pass condenser.
Check Cs. C,. C 9• and C 'O .
-
17 -
B . Noise on RHONO and T A PE .
--- 18 -
PARTS LIST
Part No .
RI
R2
R3
R4
Rs
R6
R7
RB
R9
RIo
RII
RI2
RI3
R I4
R I5
R I6
R I7
RIB
RI9
R20
R21
R22
R23
R24
R25
R26
R27
R28
R29
R30
R31
R32
R 33
R34
R3S
R36
R37
R38
R39
R 40
R41
R42
R43
R44
R 4s
R46
R47
R48
R49
Rso
SKn
SKn
100Kn
100Kn
IS0Kn
IS0Kn
170Kn
170Kn
100Kn
100Kn
ISKn
ISKn
300n
300n
ISKn
ISKn
70Kn
70Kn
ISKn
ISKn
12Kn
12Kn
Ion
Ion
3Kn
3Kn
12Kn
12Kn
16Kn
16Kn
SKn
SKn
SOKn
SOKn
2 .SKn
2.SKn
IS0Kn
IS0Kn
100Kn
100Kn
ISOKn
ISOKn
400Kn
400Kn
I.S Kn
I.SKn
SMn
SMn
100Kn
100Kn
Part No .
Nomenclature
J{ Watt ± 10 % Carbon Fixed
J{ Watt ± 10 % Carbon Fixed
J{ Watt ±10 % Carbon Fixed
J{ Watt ± 10 % Carbon Fixed
J{ Watt ± 10 % Carbon Fixed
J{ Watt ± 10 % Carbon Fixed
J{ Watt ± 10 % Carbon Fixed
J{ Watt ± 10 %
Noise-less
J{ Watt ± 10 %
Noise-less
J{ Watt ± 10 %
Noise-less
J{ Watt ± 10 %
Noise-less
J{ Watt ± 10 %
Noise-less
J{ Watt ± 10 % Carbon Fixed
J{ Watt ± 10 % Carbon Fixed
J{ Watt ± 10 %
Noise-less
J{ Watt ± 10 %
Noise-less
J{ Watt ± 10 %
Noise-less
J{ Watt ± 10 %
Noise-less
J{ Watt ± 10 %
Noise-less
Noise-less
J{ Watt ±10 .%
Noise-less
J{ Watt ±10 %
J{ Watt ± 10 % . Noise-less
J{ Watt ± 10 %/ Carbon Fixed
J{ Watt ± 10 % Carbon Fixed
Noise-less
J{ Watt ±10 %
Noise-less
J{ Watt ± 10 %
J{ Watt ± 10 % Carbon Fixed
J{ Watt ± 10 % Carbon Fixed
J{ Watt ±10 % Carbon Fixed
J{ Watt ±10 % Carbon Fixed
J{ Watt ± 10 % Carbon Fixed
J{ Watt ±10 % Carbon Fixed
J{ Watt ± 10 % Carbo l) Fixed
J{ Watt ± 10 % Carbon Fixed
J{ Watt ± 10 % Carbon Fi xed
J{ Watt ± 10 % Carbon Fixed
Yz Watt ± 10 % Carbon Fixed
Yz Watt ± 10 % Carbon Fixed
J{ Watt ± 10 % Carbon Fi xed
J{ Watt ± 10 % Carbon Fi xed
Yz Watt ± 10 % Carbon Fixed
Yz Watt ± 10 % Carbon Fixed
J{ Watt ± 10 % Carbon Fi xed
J{ Watt ± 10 % Carbon Fixed
J{ Watt ± 10 % Carbon Fi xed
J{ Watt ± 10 % Carbon Fixed
Yz Watt ± 10 % Carbon Fi xed
Yz Watt ± 10 % Carbon Fixed
Enclosed in CRS02
Enclosed in CRS02
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
RSI
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resisto r
R76
Resisto r
Resistor
Resis tor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Res istor
Resis tor
Resistor
Re sistor
R83
RS2
RS3
RS4
Rss
RS6
RS7
RS8
RS9
R60
R61
R62
R63
R64
R6s
R66
R67
R68
R69
R70
R7I
R72
R73
R74
R7s
R77
R78
R79
R80
R81
R82
R84
R8s
R86
R87
R8B
R89
R90
R91
R92
R93
R94
R9s
R96
R97
R98
R99
Rloo
-
19-
Nomenclature
ISKn
ISKn
100Kn
100Kn
Enclosed
Enclosed
Enclosed
Enclosed
in
in
in
in
CRS02
CRS02
CRS02
CRS02
SOKn
SOKn
80Kn
80Kn
I .SKn
I.SKn
2Mn
2Mn
IS0Kn
IS0Kn
20Kn
2Mn
2Mn
2Mn
2Mn
1Mn
1Mn
SOKn
SOKn
SOKn
SOKn
SOKn
SOKn
300n
300n
I.SKn
I .SKn
2K n
2Kn
600Kn
600Kn
IS0Kn
IS0Kn
12Kn
12Kn
6Kn
6Kn
30Kn
30Kn
SOKn
30Kn
30Kn
2S0Kn
2S0Kn
J{ Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
J{ Watt ± 10 % Carbon
J{ Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
Yz Watt ± 10 % ' Carbon
Yz Watt ± 10 % Carbon
1 Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
Enclosed in CRSOI
Enclosed in CRSOI
Enclosed in CRSO 1
Enclosed in CRSOI
Enclosed in CRSOI
Enclosed in CRSOI
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
Yz Watt ± 10 % Carbon
Yz Watt ± 10 % Carbon
Yz Watt ± 10 % Carbon
Yz Watt ± 10 % Ca rbon
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
Yz Watt ± 10 % Carbon
Yz Watt ± 10 % Carbon
1 Watt ± 10 % Carbon
Yz Watt ± 10 % Carbon
Yz Watt ± 10 % Carbon
);,I Watt ± 10 % Carbon
);,I Watt ± 10 % Ca'rbon
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fi xe d
Res istor
Re sisto r
Resisto r
Resistor
Res istor
Resi stor
Res ist or
Res istor
Res is tor
Resistor
Resistor
Res is tor
Res ist or
Res is tor
Res is tor
Re sistor
Resistor
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fixed
Fix ed
Fixed
Fixed
Fi xed
Fi xed
Fi xe d
Fixed
Fi xed
Fixed
Fi xed
Fixed
Fi xed
Fi xed
Fixed
Res istor
Res istor
Resis tor
Res istor
Res istor
Resistor
Resis tor
Resistor
Resi stor
Re sistor
Resisto
Resisto
Re sistor
Resistor
Resisto r
Re sistor
Resistor
Resistor
Resistor
Resi stor
Resistor
2S0Kn );,I Watt ±10 % Ca rb on Fixed Resistor
2S0KO J{ Watt ± 10 % Carbon Fi xed Re sis tor
.
Port No.
Nomenclature
Port No .
Riol
1 KD )1 Watt ± 10 % Carbon Fixed Resistor
C20
O.Ol p F
SOWV
± 10 %
mylar
tubular
C70
RI07
1KD )1 Watt ±1 0 % Carbon Fixed Resistor
C21
0 .003 p F
400WV
± 10 %
oil
tubular
0 1
RI03
1KD )1 Watt ± 10 % Carbon Fix e d Res is tor
C22
0 . 003 p F
400WV
± 10 %
oil
tubular
RI04
1KD )1 Watt ±1 0 % Carbon Fi xe d Resistor
C23
O. l p F
2S0WV
± 10 %
MP
tubular
C72
C73
R105
40KD )1 Watt ±1 0 % Carbon Fixed Res ist or
C24
O. l p F
2S0WV
± 10 %
MP
tubular
RI06
40KD )1 Watt ± 10 % Carbon Fixed Res is tor
0 5
4p F
20WV
El ec t r olytic
RI07
2SKD )1 Watt ± 10 % Carbon Fixed Resis tor
C26
20WV
400WV
400WV
40 fl F
40p F
SOOWV
Electrolytic
lug
terminal
SOOWV
'Electrolytic
iug
terminal
200,u F
300WV
Electrolytic
lug
terminal
200,u F
300WV
Electrolytic
lug
C74
O.OOS ,u F
600WV
±10%
oil
tubular
0 5
O.OOS ,u F
± 10 %
oil
tubular
El ect rol y tic
tubular
06
SO f.l F
600WV
SOW V
Electrolytic
tubular
± 10 %
oil
tubular
2SWV
Electrolytic
tubular
oil
tubula r
C77
0 8
SO ,u F
± 10 %
200,u F
2SWV
Electrolytic
tubular
0 9
200,u F
2SWV
Electrolytic
tubular
C80
O.OOS ,u F
SOOWV
:t: l 0~%
Ceramic
tubular
C81
O.OS ,u F
400WV
± 10 %
oil
tubular
RI08
2SKD )1 Watt ± 10 % Carbon Fi xed Resis tor
C27
4 fl F
O. OOl f.l F
RI09
SOKD )1 Watt ± 10 % Carbon Fi xed Resistor
C28
0 .001 f.l F
Rllo
SOKD )1 Watt ± 10 % Carbon Fixed Resi sto r
C29
lS0pF
Enclosed
in
CRS02
R11 1
16.0 10Watt ± 10 % Wi re Wound Resi stor
C30
lS0pF
En c los e d
in
CRS0 2
RI1 2
16.0 10Watt ± 10 % Wire Wound Resis to r
C31
0 .00 3 /I F
En closed
in
CRS02
RI13
30.0
1 Watt ± 10 % Carbon Fi xed Resistor
C37
0 .003 p F
En clo se d
in
CRS02
30.0
RI14
1 Watt ± 10 % Carbon Fixed Resistor
C33
0.03 fl F
Encl osed
in
CRS0 2
RI15
2. SKD )1 Watt ± 10 % Ca rbon Fi xed Resis to r
C34
0.03 f-L F
Encl os e d
in
CRS0 2
RI16
2.SKD )1 Watt ± 10 % Carbon Fixed Resist or
C35
20 f-L F
300WV
El ec trol y tic
tubu la r
R! 17
SKD )1 Watt ± 10 % Carbon Fi xed Resist or
C36
0 . 1 fl F
2S0WV
MP
tubu lar
1 Watt ± 10 % Carbon Fixe d Resistor
C37
MP
tubula r
C38
0 . 1 f.l F
30 p F
2S0WV
lSKD .!1 Watt ± 10 % Carbon Fixed Resis tor
6WV
Electrol y ti c
tubular
RI18
RI 19
lS0KD
VRI VR2
RI 20
4KD
2 Watt ± 10 % Carbon Fixed Res istor
C39
30 p F
6WV
Electrolytic
tubular
RI21
2KD 10Watt ± 10 % Wire Wound Resis tor
C40
20WV
El e ctrol y ti c
tubular
RI27
12KD 20Watt ± 10 % Wir e Wound Res istor
C41
4 /I F
4p F
20WV
El ectr olytic
tubular
RI23
2kD )1 Watt ± 10 % Carbo n Fixe d Resis tor
C42
O.OOS f.l F
400WV
oil
tubular
RI24
SOOD )1 Watt ± 10 % Carbon Fi xe d Resis tor
C43
O.OOS fl F
400WV
o il
tubular
RI25
7KD )1 Wat t ± 10 % Carbon Fi xe d Res isto r
C44
O.OOS f.l F
400WV
o il
tubular
RI26
7KD )1 Watt ± 10 % Carbon Fixed Resist or
C45
O.OOS p F
400WV
oil
tubular
R127
7KD )1 Watt ± 10 % Carbon Fixed Resistor
C46
0 . 01 p F
400WV
± 10 %
oil
tubular
RI28
7KD )1 Watt ± 10 % Carbon Fixe d Resistor
C47
tubular
C48
± 10 %
in CRS01
o il
6KD )1 Watt ± 10 % Carbon Fi xe d Res istor
0 .01 f.l F
300pF
400WV
RI29
RI 30
2KD )1 Watt ± 10 % Carbon Fix e d Resis tor
C49
300pF
C50
CI
30/I F
10WV
El ec trolyti c
tubular
C51
C2
30/I F
10WV
El ectrol y ti c
tubular
C3
30f.l F
10WV
El e ctrolytic
C4
30/I F
10WV
C5
30f.l F
12WV
C6
30 f.l F
12WV
Enclosed
in
CRS01
200pF
Enclosed
in
CRS01
200pF
Enclo se d
in
CRSOI
C52
200pF
Enc lo se d
in
CRSOI
tubular
C53
200pF
Enclo se d
in
CRS01
El e ctrolytic
tubular
C54
30f.l F
6WV
Electrolyt ic
tubular
El ec trolytic
tubular
C 55
30fl F
6WV
El e ctrolytic
tubul ar
Elec trol y tic
tubular
C56
2S0WV
± 10 %
MP
tubular
2S0WV
o
10f.l F
10WV
E ~c trol y tic
tubular
C 57
± 10 %
MP
tubular
C8
10/I F
10WV
El ectr ol y tic
tubular
C58
O.S p F
2S0WV
± 10 %
MP
tubula r
C9
30f.l F
10W V
El ec trol y tic
tubular
O. S fl F 2S0WV
± 10 %
MP
tubular
CIO
30f.l F
0.06 f.l F
~ I ectrolytic
C59
tubular
C60
80pF
SOOWV
± 10 %
mica
tubular
SOWV
tubular
C61
80pF
SOOWV
± 10 %
mica
tubular
tubular
C62
0 .3 fl F
2S0WV
± 10 %
MP
tubular
10WV
SOWV
± 10 %
CI3
0 .06 f.l F
0. 02S f.l F
mylar
mylar
SOWV
± 10 %
mylar
tubula r
C63
0 . 3 f.l F
2S0WV
± 10 %
MP
tubular
CI4
0 .02S p F
SOWV
± 10 %
myla r
tubular
C64
O. 3 f.l F
2S0WV
± 10 %
MP
tubular
Cl 5
O.Ol p F
SOWV
± 10 %
mylar
tubula r
C65
0.3 p F
2S0WV
Cl 6
± 10 %
my lar
tubula r
C66
20 f.l F
300WV
MP tubular
lug term inal
CI7
0 . 01 fl F
lS0pF
± 10 %
El e ctrolytic
SOOWV
± 10 %
mica
tubular
C67
20f.l F
300WV
Electrolytic
lug
terminal
Cl 8
lS0pF
SOOWV
± 10 %
mica
tubular
C68
20 f.l F
300WV
Electrolytic
lug
terminal
C I9
0 . 01 f-L F
SOWV
± 10 %
mylar
tubular
C69
20 /I F
300WV
Electrol y tic
lug
t e rminal
CI2
SOWV
± 10 %
-
20 -
terminal
tubular
SOOKD (A) Variable Resistor 24¢ type
loudness tap 120KD (Volume control)
VR3-VR6
1MD (N) Variable Resistor 24¢ type
(Tone control)
. VR 7 VR8
SOOKD (A . C) Variable Resistor 24¢ type
( Balance control)
VR lO ~ 13
SOKD (B) Variable Resistor driver type
VRI 4 VR I5
100.0 Hum Balancer driver type
VI-V3b
12AX7 Pre amplifier
V40- V5b
6AN8
V6- V9
7189A Power amplifier
TR I- TR4
Transistor 2SB-381 Head amplifier
Phose splitter
TI
Power transformer
T2. T3
Output transformer
SD- 1B
Si diode AC (RMS) 280V ID SOOmA
SW - OS03
Si diode AC (RMS) 90V ID SOOmA
- SS o C ~ + 100 ° C
SI(o- b)
Cartridge switch
- 60 ° C ~+
Enclo se d
0 .2f.l F
O. 2p F
Cli
Nomenclature
100 ° C
S2(0 - 1)
Input Selector 'switch
S3(0- c)
Mode switch
S4(0-b)
Tap e monitor switch
S5(0- b)
loudn ess switch
S6(0 - d)
Tone defeat switch
S7(0-d)
low filter switch
S8(0-b)
High filter switch
S9 (0-b)
Presence switch
SI 0(0-b)
Speaker switch
Sl1 (a-b)
level meter control switch
512
Power switch
51 30, 13b
level meter pilot lamp switch
5140, 14b
level meter switch
COI- 2
AC outlet
OA- 91
Ge. diode VD = 90V ID=2SmA
-SS o~ 7S o C
TR
v,' 12AX7
TR
V",fI
12AX7
V.. '"
SAN8
~, V,
7189
N
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MP
<11 MYLAR
~ NOISE LESS
o CERAMIC
o
S,(a-bl
1 MA G
2 Xta!
S, Ca.- rll_ TSELECTOR
1 TUNER
2 PHONO
3 MIC
• TAPE
5 AUX
5, la-c I MODE SELECTOR
1 REVERSE
1 NORMAL
3 MIX (R+L)
• CHAN R
5 CHAN L
55 (a.- h)
I OFF
2 ON LOUDNESS
S6(a .... d l
1 OFF
2 ON TONE OEFEAT
S7(a-d)
1 OFF
2 ON LOW FILTER
Ss (a ... b )
1 OFF
2 ON HIGH FILTER
S.(a-b)
I OFF
2 ON PRESENCE
5'0 (a. "b)
1 ON
2 OFF SPEAKER
S/T(a.-b)
1 LEVEL lOW
·2 LEVEL illDOLE
3 LEVEL HIGH
5 12
1 OFF
2 ON AC
S,;u PILOTLAHP
1,2.3,4 OFF
5
ON
S. "'-bl
Sl3b PlLf)TL AMP
1,2,3,5 OFF
2 ON TAPE MONITOR
4
, OFF
ON
S"" LEVEl.ME,.R
1.2 ,3,4 OFF
5
ON
S"" LEVEL METER
1,2,3.5 OFF
4
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S ,Ca-b )
I MAG
2 Xtal
S, (a.- f) IIIfflT SELECTOR
I TUNER
2 PHONO
3 MI G
4 TAPE
5 AUX
S, la- cl /oIODE SELECTOR
I
Z
3
4
5
S.
REVERSE
NORMAL
MIX(R+L)
CHAN R
CH AN L
(a.-b)
I OFF
2 ON TAPE MONITOR
(a. ... b)
I OFF
S6 (a - d)
I OFF
2 ON TONE DEFEAT
S 7(a - dJ
I OFF
2 ON LOW F/l TER
S8 (a.-b )
I OFF
2 ON HIGH FILTER
S.(a.- b)
I OFF
2 ON PRESENCE
S,o {a. ... b)
I ON
2 OFF SPEAKER
II:
SI/(a-b)
I
LEVEL LOW
,2 LE VEL HIODLE
J LEVEL HIGH
5"
I OFF
2 ON AC
S'Ja PIl.OTLAHP
1. 2,3.4 OFF
5
ON
So. PlLOTL AMP
1.2,3,5 OFF
ON
4
JA
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5 ,4< LEVEl.fiIETER
1.2,3,4 OFF
ON
5
S,.. LEVEL. METER
1,2,3 ,5 OFF
4
ON
~~~~
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SANSUI ELECTRIC COMPANY LIMITED
Head Office;
14-1. 2-chome. Izumi . Suginomi - ku. Tokyo. Japan _
TEL _ 323- 1111
Printed in Japan
(01200M6)