Contents
Page
Page
1.
Specifications
.............:ccecceceee
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eee
et
eee
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eens
1
7.
Printed
Circuit
Board
Ass’y
and
Parts
List
........
9~18
2.
Technical
Explanation
of
‘‘Dynamic
Super-A”’.....
2~3
7-(1)
TXX-376
Equalizer
Amp.
2-(1)
Basic
Configuration
of
‘‘Dynamic
Super
A
P.C.
Board
ASS’
Y
.........:.ecceneeeeeeeeeeeeeees
9~11
Power
Amplifier
..............2.0eceeeeneeeeeeeeeeeeeees
2
7-(2)
TXX-373
Drive
Amp.
2-(2)
‘‘Dynamic
Super
A”’
Circuit
Operation
...........
2
P.C.
Board
ASS’y
......--.c:eceeeeeneeeeeenenes
12~14
3.
Main
Parts
Location
and
Part
Numbers
............-.-.-.
4
7-(3)
TXX-374
Power
Amp.
3-(1)
Front
View
...........:csceseneeseeeeeeeeeeeeeeerererese
4
P.C.
Board
ASS’y
.........:.ccteceeeeeeeeeeee
ee
15~18
3=(2)
Rear
View
sssisccsccviscexscessceacaaennreossseoonnnenes
4
7-(4)
TPS-287C
AC
Unit
P.C.
Board
Ass’y
........
18
3-(3)
Top
View
.........:0.cssseesesecceeneecceeeneenerenereeenes
4
7-(5)
TPS-287D
AC
Unit
P.C.
Board
Ass’y
........
18
4.
Block
Diagram
.............:ccceeeeeceenee
sees
teen
ee
eeeneeeeees
5
7-(6)
TPS-287E
AC
Unit
P.C.
Board
Ass’y
........
18
5.
Exploded
View
and
Part
Numbers
.................++
6~7
8.
Packing
Materials
and
Part
Numbers
...........-....+++
19
6.
Amplifier
Adjustment
procedures
.............:..0esseee
8
9
Accessories
List
............::::cceceeeeeeeeeneereseeneeeeeees
19
6-(1)
Drive
Amp.
Center
Voltage
Adjustment
.........
8
10.
A-X55
Schematic
Diagram
..............0:ceeeee
seen
eeee
20
6-(2)
Power
Amp.
Idling
Current
Adjustment
.........
8
11.
Power
Supply
Block
for
Designated
Areas
............
21
12.
Parts
List
with
Specified
Numbers
Warning:
When
replacing
the
parts
marked
with
A\
,
be
sure
for
Designated
Areas
.........cccceeeeeeeeeeeeeeeneeeeeeeees
22
to
use
the
designated
parts
to
ensure
safety.
a
a
a
1.
Specifications
CIRCUITRY
Preamplifier
:
ICL,
DC-servo
MC/MM
Signal-to-noise
ratio
equalizer
with
EL-FETs
in
its
PHONO
(MM)
:
86
dB
initial
stage
PHONO
(MC)
:
70
dB
(250
pV
input)
Power
amplifier
:
3-Stage
differential
ICL-DC
TUNER
:
110
dB
‘‘Dynamic
Super-A’’
power
AUX
:
110
dB
amplifier
with
cascode-
TAPE
:
110
dB
connected
dual
FETs
and
a
(IHF
A
Network
short
circuit)
boot-strap
amp
in
its
initial
PHONO
(MM)
:
84
dB
(Rec
out)
stage
PHONO
(MC)
:
76
dB
(Rec
out)
ALLOVER
CHARACTERISTICS
TUNER
:
84
dB
(Speaker
out)
Output
power
(AUX
IN
—
SP.
OUT)
AUX
:
84
dB
(Speaker
out)
1
kHz
:
75
watts
RMS
per
channel
TAPE
:
84
dB
(Speaker
out)
min.
(8
ohms,
0.0007
%
total
(IHF
A-202)
harmonic
distortion
measured
Tone
controls
:
TREBLE:
+8
dB
(10
kHz)
by
JVC
Audio
Analyze
System)
BASS:
+8
dB
(100
Hz)
:
83
watts
RMS
per
channel
Subsonic
filter
:
18
Hz
(—6
dB/oct)
min.
(8
ohms,
0.7
%
total
har-
Loudness
control
:
100Hz:
+
6dB,10kHz:
+
4dB
monic
distortion)
(at
VOLUME
—
30
dB)
20
Hz
—
20
kHz
:
70
watts
RMS
per
channel
Muting
level
:
—20
dB
min.
(both
channeis
driven
into
EQUALIZER
8
ohms
from
20
Hz
to
20
kHz,
PHONO
overload
capacity
with
no
more
than
0.003
%
PHONO
(MM)
:
250
mV
(1
kHz,
0.004
%
total
harmonic
distortion.)
THD)
Total
harmonic
distortion
PHONO
(MC)
:
15
mV
(1
kHz,
0.008
%
THD)
AUX
IN
—
SP.
OUT
:
0.003
%
(20
Hz—20
kHz,
PHONO
RIAA
deviation
:
+0.2
dB
(20
Hz—20
kHz)
8
ohms)
at
70
watts
Total
harmonic
distortion
PHONO
IN
—
SP.
OUT
PHONO
(MM)
:
0.004
%
(at
8
V
output,
at
Volume
—30
dB:
0.007
%
(20
Hz—20
kHz,
20
Hz—20
kHz)
8
ohms)
at
70
watts
PHONO
(MC)
:
0.008
%
(at
8
V
output,
Intermodulation
distortion
20
Hz—20
kHz)
(AUX
IN
—
SP.
OUT)
:
0.002
%
(60
Hz:
7
kHz=4:
1,
Recording
output
8
ohms)
at
70
watts
Output
level/impedance
Power
band
width
:
5
Hz—60
kHz
(IHF,0.02
%,
TAPE
REC-1,2
:
160
mV/660
ohms
(PHONO)
(AUX
IN—
SP.
OUT)
8
ohms
both
channels
driven)
GENERAL
Frequency
characteristic:
DC—300
kHz
+0,
—3
dB
Power
source
:
See
page
22
(8
ohms)
Dimensions
:
5-1/2'"(H)
x
17-1/8'"(W)
x
Damping
factor
:
150
(1
kHz,
8
ohms)
15-7/8''(D)
Input
terminals
(14.0
cm(H)
x
43.5
cm(W)
x
Input
sensitivity/impedance
(1
kHz)
40.4
cm(D))
PHONO
(MM)
:
2.5
mV/47
kohms
Weight
:
22.0
lbs.
(10
kg)
PHONO
(MC)
:
180
»V/100
ohms
TUNER
:
160
mV/47
kohms
AUX
:
160
mV/47
kohms
hes
TAPE
:
160
mV/47
kohms
Design
and
specifications
subject
to
change
without
notice.
No.
2589
=
4
=
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