Sansui AU-70 Owners Manual
OPERATING INSTRUCTIONS
&
STEREO CONTROL AMPLIFIER
SERVICE
SANSUI AU-70
MANUAL
SANSUI ELECTRIC COMPANY LIMITED
This amplifier has a maximum output of 50 watts (25W-25W)
and features
than 0.15% at
ting features, it
This booklet explains the steps necessary for operating and
caring for your new
carefully and retain for future use.
an
amazingly low distortion factor of not more
20W. A high-quality amplifier with many exci-
is
delivered to you with Sansui's fullest confidence.
the
. AU-70. Read
an
the instructions
SUI
STEREO
AMPLIFIER
AU-70
CONTROL
CONTENTS
FEATURES.
SPECIFICATIONS ..... ... .....
CHARACTERISTICS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
CONNECTIONS..........................................
SWITCHES AND CONTROLS
OPERATIONS....
HI
NTS
SERVICE NOTE
PAR
TS
SCHEMATIC DIAGRAM
PARTS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
...
......
...
...
...
.....
ON USE
LIST
LAyOUT
......
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...
..... .
...
.. ..
..
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... .
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....
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..
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......
......
... .
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... ..
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...........
..
........
....
.. .. ..
............
....
..... .
. 5
.. 15,
.. 19,
.
23
3,
7,
11,
13,
17,
22
4
8,
12
14
16
18
20,
9,
10
21
FEATURES
7189A
P.P.
PRODUCES
PISTORTION (MAX
·0.15%
The
(fixed bias)
combined. maximum
The
circuit
first
This
th e whole
tortion
frequency
minimize har
limited to
a
feat
feature
is
in P.P.
su
ch
7189A
amplifier
time
makes
for a
lower
clarity
AT
1,000
power
Jor
(total
in
it
frequency
at 1 kc
at
not
50-watt
is
the
than
This
.
high-fidelity
incorporates a multiplex
negative
this
extremely
is
0.15%.
which
monic
more
damping
that
is
why
40W
. 0.95%
CPS
tubes
output
feedback: 26 dB) for
class of amplifiers in Jilpan.
range.
it is
distortion,
than 0.95%. This
amplifier.
factor of 18, a figure
of
triode
bass
AT
)
operate
reproduction.
is
low
in
Total
At
30 cps, a
extremely
Another
power
sounds
30
in class
limited
distortion
harmonic
the
distortion
tubes
come
WITHOUT
CPS
AND
AB,P.P.
Their
to
50 W .
feedback
over
dis-
very
low
difficult · to
is
quite
remarkable
which
' coupled
out
with
the
is
NFB
USED
FROM
The
low
meaningless
tions.
circuit
unlike
and
back
noise
Your
in
conventional
has
loop.
and
IN
ALL
PREAMP
distortion
if
its
all its circuits in a single
These
distortion.
the
AU-70
interm
TO
preamplifier
ediate
one-stage
make
SUPER-PRECISION
LIFIER
The
which
compared
noise factor of 2
tional 5 dB, eliminates
of
a
much
larger
EACH
DEPENDENTLY
ELIMINATES
exclusive
features a
with
high
-fidelity
better
than
CHANNEL
Sansui
transistor
conventional
dB-as
reproduction.
SIN
ratio
vacuum-tube
EQUIPPED
DEFEAT
Each
channel
bass
and
possible.
with
tone
circuits.
response
response
the
case of
means
get
ca n
your
AU-70
of a
an
has
treble.
Moreover,
defeat
You
can
without
or
redu
ced
conventional
tone
accurate,
just
independent
This
which
easily
causing
volume
by flipping a switch.
AMPLIFIER
POWER
of
the
power
generates
uses a
three-stage
or
cpntrol
control
your
AU
TRANSISTOR
HUM
four-transistor
hum
CAN
each
cancels
gain
perfectly flat
AND
circuit factor of
5-1O-al1d
compared
and
noise,
The
and a gain
amplifiers.
BE
OPERATED
tone
makes
obtain
in bass
knob.
fine
channel
the
a flat frequency
any
mechanical
CIRCUITS
AMPLIFIER
amplifier
distor-
amplifier
amplifier-
amplifiers-
negative
-70 free from
-feed-
PREAMP
NOISE
preamplifier,
4-as
a transistor
with
conven
the
enemy
amplifier has
three
times
WITH
undulation
and
Therefore,
response
TONE
contro
ls for
adjustment
is
equ
ipped
tone
control
treble as in
control by
from
you
IN-
in
,
is
BLEND
S
HIFT
As
our
y
stereop
-
-
you to
ting
s
tron
EASYLEVEL
Each
any of
The
ch
anne
between
very useful
CIRCU
FROM
you
turn
AU
-70
honic
get
program
g effect of the conce
TO-
READ
IT
PERMIT
MONAURAL. TO
the
"BLEND"
gradually
repr~duction.
full
stereophonic
sour
ces
THREE-RAN
METERS
output
meters not only give
ls,
the
the
level
three
but
also indicate
right
in
balancing
meter
scales of 5, 10
and
CONTINUOUS
STEREO
switch clockwise,
shifts from
This
feature
effect by compensa-
which
give a, particularl y
rt halL
GE
can
be switched over to
and
direct
left
the
readings
any
outputs.
outputs
la ck of
monaural
enables
OUTPUT
25 watts.
of
balance
These
.
prove
to
both
THREE-DIMENSIONAL PERFORMANCE
POSSIBLE
OUTPUT
Y~ur
center
-channel amplifier.
monaural
effect.
EQUIPPED
PERFORMANCE
Your
AU-70
ory
access
and high
sence, blend, speaker switch and
WITH
CENTER-CHANNEL
TERMINAL
AU
-70 has
amplifier to produce a
WITH
an output
ADVANCED, HIGH-
ACCESSORY
is
equipped
circuits
filters,
such
tape
monitor,
terminal
Connect
three-dimensional
for the
it to your
CIRCUITS
with
various
as loudness control, low
tone
headphone
advan
defeat, pre-
jack.
ced
- 3
- 4 -
SPECIFICATIONS
CHARACTERISTICS
M
AIN
AMPLIFIER:
MAXI
MUM
OUTPUT
HARMON
IC
DISTORTION:
INTERMODULATION
IS
TORTION :
D
FREQUENCY RESPONSE:
OU
TP UT IMPEDANCE: 8
G
AIN
AND
SENSITIVITY
PHONO : MAG 84 d B (
x-
T
AL
54
dB
TAPE :
MIC:
AUX : (TAPE MON)
TUNER :
R
ESIDUAL NOISE:
S
IN
T
ONE
86 dB (Output 20W
86 dB (Outp
51
dB (O
RATIO
CONTRO
51
utput
L:
:
25W-25
Max. 0.15 %
Max . 0.95%
Max. 0.
+
5,50
10-80,000
and
:
Ou
tput
2
(Output 2
a t 0 .9mV inpu t)
ut 20W a t
dB (Output 2
20W
at 50mV input)
below
52
dB (at
T
ype
CR
50 Hz +
10,000 Hz
W (SOW to
at
20W for 1,
at
20W
85 % at
0 Hz)
16 ohms
0W
at
1.1 mV input
0W
at
0.9
mV input)
0W
0.25 p.W
T
APE
11
to
+ 12
tal)
000
Hz
for
30
Hz
20W
, (50 Hz
Hz
at
±1
dB
)
36mV input )
a t 50mV inpu t)
terminal)
- 15 dB
to
- 13
dB
VA
CUUM
TUBES, TRANSISTORS
7189A X 4, 6AN8 X 2, 12AX7 X 3, OAdio
de
X 2, 2
X 2 5W-
TOTAL
PO
WER
P
OWER
DI
MENSIONS
W
EIGHT:
5B-381
0503
9 tu
:
SUPPLY
CONSUMPTION:
:
tra
nsis
silicon dio
a nd 9 diodes
bes
:
117V AC,
Width 15" /
Height 5
19
30 lbs
tor X 4,
de
150VA
/'.
6
/3/ ' .
x l
D
50
50
epth
AND
-1
and
DIODES:
ge
rmanium
91
B silicon diode
60
Hz:
19
12
/
/1.
32
-
II)
~
w
z
'"
0
"-
'"
~
;;;-
~
w
~
0
"-
~
Q:
20
r-
10
0
- 10
20
-
-
10
0
-1
0
-20
- 30
TONE
M~X
~
1
HIGH
AND
LOW
,
I
CONTROL
:---....
..."...
100
LOW
-1--
FILTER
100
CHARACTERITICS
I K
FILTER
CHARACTERISTICS
I K
....
......
r-
TONE
10
10K
M~X
~
DEFEAT
MIN
'"
K
HIGH
"\.
\
FILTER
FREQUENCYRESPONSECHARACTE~ST~S
6
4
2
a;-
0
~
w - 2
,
en
Z
.......
A
~
- 6
~
- 8
0::
-10
-12
10 100
10
e
z
0
;::
Q:
0
5
...
!!?
c
1
o I
1111 I 1
NF: 26dB LOAD RESISTANCE: 160HMS
HARMONIC
I I I I I I I I I
I J
- HARMONIC I Ke
___
DISTORTION 1
_ .-10Ke
5
--
----
I
I I I 11
--
1111111
OU
TPUT : I W
TPUT : 20W
OU
II
1111
11
I K
DISTORTION
~Nt~t
00% 'LOAD
-
,....
-
10 15
10K
t~fE~T
RESISTANCE : 160HMS -
20
lOO
K
I
I)
:'J
.,
25
E
QUALIZER
TAPE:
PHONO:
A
CCESSORY CIRCUITS
PRESENCE CONTROL: Turno
LOW FILTER: 5
HIGH FILTER : 10,
:
Ty
pe NF
NART
B (50p.s)
RIAA
:
ver
a t
150
Hz
0Hz
- 12.5 dB
000
Hz
- 13.5
dB
LOUDNESS CONTROL
TONE
DEFEAT
TAPE MONITOR
HEADPHONE JACK
TAPE RECORDER PLAYBACK CONNECTION (DIN)
TERMINAL
LEVEL MET
FOR CENTER·
ER (FOR
OUTPUT
CHANNEL
)
Three ra n
10
AMPLIFIER
ges
and 25W
BLEND CONTRO L
of
5,
- 5 -
~
"I..
I
NPUT
-
~
...
::::>
"-
...
::::>
0
AND
OUTPUT
25
INPUT : MAIN
NF: 26
db
RESISTANCE: 160HMS
10
CHARACTERISTICS
LOAD
/
II
/
V
0.
3 I 2
/'
- 6 -
e
z
Q
...
:5
...
!!?
c
INTER
MODULATION
I I I I I I I
.5Ke+50
10
5
5
% LOAD
DISTORTION
RESISTANCEI60HMS
I
II
1
1
5
10
15
20
I
CONNECTIONS
SPEAKER
STEREOPHONIC
Connect
8on
the
termin
to
terminals on the
(-)
terminal
L
(+)
or 16-ohm
the back
rig
ht-hand
als.
Connect
the
8-
or
of
the
left-hand
s.
MONAURAL
When
a
16-ohm
the
Connect the
you
use
ural reproduction, conn
speaker
(+)
terminal
upp
REPRODUCTION
of the rig
terminal
of
the
speaker to
16-o
back
ht-hand speaker
of the
amplifier.
(+)
of
hm
termin
of
the
spea
ker to (C) of
upp
(C) of
the left-hand
al
amplifier.
REPRODUCTION
an
8-o
termin
of
er a
hm spea
the
nd
ker
ect the
als of
lower (C) s
your
speaker.
er R
Connect
the
of
the
sys
tem
upper
amplifier
peaker
to
termin
(- ) of
upp
speaker
lower L
Connect
the lowe
for mon-
and
term
er R
low
the
als
er
to
i-
nals
of
your
amplifier to
speaker.
THREE·DIMENSIONAL
PHONIC
Your
AU-70
ce
nter-chann
for
three-dimensional
To
r
do
monaural
amplifier
cente
r-chann
spea
ker
Th
e center-c
so
unds to
Speakers
coaxial s
REPRODUCTION
is equipp
el amplifi
this,
connect the
amplifier
can
be used) to the pin-jack
el o
utput
terminal boa
hann
el
produce
suitable
peak
ers
tor
and,
the
(- )
ed with
er
so
reproduction.
(Either
terminal at the left
rd
mix
es
the
thre
the
AU-70
for
the
a termin
that
it ca n
input
a ma in
with
terminal
or combination
a s
the
right and left
e-dimensional effect.
are
best musical repro-
termin
al of
the
STEREO·
al for a
be
used
of
a
of
the
of
the
hielded
20
to
wire
30-cm
duction,
use different
ranges.
In choo
quality
CAU
If
do
midway betw
th
at the amplifi er and
in
(+)
Wh
phonic reprod
output terminal connections
between
con
yo
also
two
or
three-way speake
speakers
sin g the
in ad
TION:
yo u find that the so
not
mix
polarity
and
(-) conn
en
you
Rand
nected
ur
amp
lifier will
go out
properly
cabi
dition
well,
een the
(phase).
use
two
uction,
of
order.
net, t
to
but lea
In
ect
pairs of
mak
L a
.
If
not work
for
design.
unds from
spea
kers, you can conclude
the
such a case, reverse the
ions
e sure that
nd
that
the connect
different
ake
ve a
speake
of eith
spea
do
the
normally
r systems
acco
unt
both spea
sort
rs
do
er
spea
kers for stereo-
not
ca use
terminals
ions
which
frequency
of
of
vac
not match
ker.
the
speaker
contact
are
faulty,
and m
ton
kers
uum
are
al
ay
RECORD
1.
Connect the o
R"
and "PHONO-L" terminals (in
of
monaur
terminals)
sh
ield
ed
2.
Set
the cartridge
amplifier to
to
the
3.
Connect
to
the
yo
ur
am plifier.
PLAYER
utp
ut terminals to the
al
reprodu
on
the
back
wires.
switch
"MAG"
type
of yo
ur cartridge.
the
power-
power
plug r
ction , to
of
your
on the
or "X-TAL" according
cord plug
eceptacle
MICROPHONE
Connect the micr
te
rminals
you us e
the
other
on
two
to L.
ophone
the
back of yo
mi cr
ophones,
to R
ur
connect
or
amplifier.
"PHONO-
the
either of these
amplifier
back
of
on
the
L of
olle to
the "MI
the
of
player
back
When
Rand
with
your
case
of
C"
~
0 , O'
~;::..,/-~-~~
P,)\,]
~
Q;
O~
1'-
0'
0'
=~~~
'L'~t::'
Q)
0;
'0'
L'
C'
0'
.~c
Q;
0
.;.\
C e
15
- 7 -
i Pl
ayer
(magnetic)
P
layer (crystal)
8 -
, "
Microphone
CARTRID
S
et
this
ing on
ma
gne
(
GE
to MAG
your
tic
or crys
SWITCH
or X·TAL
pla
yer
tal
,
'.
car
)
tridge
dep
end
.
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