Sherwood S-9400 User Manual

SHEFR\ATOOD
LOW
FILTER
When
depresged
reduces
rumble
from
turntable
and
low
frequency
noise.
(Attenuates
at
12
db/octave).
SELECTOR
coltTRoL
Selects
your
stereo listening
source:
PHONO
1,
PHONO
2/
MIC, TUNER,
AUX.1, AUX.2.
MoDEL
5-9400
sTEREO/DYNAQUAD
AMPLIF
IER
5ERVICE MANUAL
0
$
r
L\
ILLUTIilATED
SELECTOR
IIIDICATOR
Describes
position
of
selector
swltch.
BAtJAIiICE
Balancee the
relative
volume
levels
between
your
right and
left speakers.
SPEAKERS
S€lects
your
main
stgreo
speakers
(A),
remote
stereo
speakers
(B),
both
sets, or
turns speakers
off
(for
headphone
listening).
IODE
SWITCH
Permits
listening
to left channel
only,
right
channel
only,
stereo,
reverse
or
mono-through
both
speakers.
touDNEss
Masler
power
ON/OFF
and
volume
control
for
your
speakers.
Also
automatically
add bass
compensation
at low levels.
LOUONESS
When depressed,
defeats
loudness
control
compensation
circuit
(which
automatically
increases bass
tones
at
low
volume
levels).
HI FITTER
When depressed
cuts off
scratch
from
records,br
background
"hiss"
trom
noisy
FM stations.
(Attenual*
at
12 db/octave).
TAPE
TOI{ITOR
Permits
recording
to,
or
(depressed)
playing
back
from tape
rscorder;
permits
monltorlng
during
recording.
BASS TREBLE
Increases
bass
lncreases
treble
tones
up to
*12
tones
up
to
*12
db,
decreases
db, decreases
up to
-12
db. up
to
-12
db.
TAPE
DUBBING
Permits
recording to,
or
playing
back
from,
a
second
tape
recorder.
Also,
permits
dubbing from
one
recorder
to
the
other.
SPECIFICATIONS
PHO]IEE
For
private
listening
with
stereo
headphones.
FOUR
CHATTINEL
Controls
special
rear
panel
inpuls
and
outputs
for
a
4 channel
decoder
(may
also
be
used as
a second
tape
monitor).
Input
Senrltlvfi
(for
rated
output):
Phono,
1.8 mv.
Auxiliary,200
mv,
Mic.,2.1
mv
Input
Gapabllity
lor 1olo
dist.:
Phono,80
mv.
Auxiliary,
lnfinite
Mic.,60 mv
Hun and l{oise
(lHF}:
Phono
-60
db.
Aux.
-85
db.
Vol.
Control
Min.
-90
db.
Crosrtalk:
-45
db
@
1
KHz.
tlc.
Input lmpedance:50,000
o
GENERAL:
Power Requiremenb:
1
1
5-1
25V, 50/60
Hz. 20-200
watls tused.
AG Outletr:
Switched
(2)
total 180
watts.
Unswilched
(1)
200
watts.
Slze:
(X)"
H, OOo
W,
00"
D.
Shlpplng
Welght:
29 lbs.
DYITIAOUAD
Controls
built-in
Dynaquad
4 channel
matrixing circuit.
Power
Oulput: Music
power
160 watts
total
(lHF)
RllS Power
Outpul
(both
channels
driven):
60wattsx2@4
ohms, l KHz
50
watts
x2
@
8 ohms, 1
KHz
40 watts
x2
@
8 ohms, 20-20,000
Hz
Harmonic
Dlstortlon:
0.8olo I ohm rated
output,
0.10o/o
@ 10
watts.
lnlermodulation
Dlsioilldn
:
0.60/o
@
8 ohm rated
output
,
O.25o/o
@
10 watts.
Slereo and lllono
Speaker
Outpul lmpedance:
4,8,
or 16
ohms.
Stereo Headphone
Output: High or
low impedance.
Stereo Recording
Output:230
mv,2K
ohm.
Power
Bandwidth:
5-45 KHz-l
o/o
Dist.
Frequency
Rerponre:
Aux.
20-20
KHz
-t-
y2
db.
Phone:
RIAA
Std.
i
1.0
db.
Damplng
Factor:
40:1
@
I ohms.
Bass
Conlrol:
-f-
12 db.
@
100 Hz.
Treble
Conlrol:
+
12
db
@
10 KHz.

Sherwood S-9400 Specifications

General

Brand	Sherwood
Model	S-9400
Category	Amplifier
Language	English

Summary

Specifications

Power Output

Details amplifier's music and RMS power output at various impedances.

Distortion Characteristics

Specifies harmonic and intermodulation distortion levels.

Frequency Response and Bandwidth

Amplifier's performance across the audio spectrum.

Servicing and Adjustment

Amplifier Electronic Relay Protection

Checks for overload protection and speaker system safety.

Troubleshooting Power Consumption

Diagnosing issues based on power draw using a VARIAC.

Center Point Voltage Checks

Verifying DC voltage at speaker terminals for proper balance.

Output Transistor Bias

Bias Adjustment Necessity and Symptoms

Conditions requiring bias adjustment and symptoms of incorrect bias.

Test Bench Set-up

Diagram and components for testing amplifier bias and performance.

Bias Adjustment Procedures

Detailed steps for adjusting bias using analyzers and VARIAC.

Protection Board Testing and Adjustment

Verifying and adjusting the electronic relay protection circuit.

Four Channel Operation

Dynaquad Matrixing Circuit

Explanation of the 4-channel matrixing circuit.

Parts List

Transistors and Diodes

List of transistors and diodes with part numbers.

Capacitors and Resistors

Lists electrolytic, tantalum capacitors, and variable resistors.

General and Mechanical Components

Lists switches, lamps, jacks, knobs, and other hardware.

Circuit Diagram

Tone Control and Power Supply Boards

Schematic diagrams for tone control and power supply sections.

Protection Circuit and Pre-Amp Board

Schematic diagrams for protection circuit and pre-amplifier.

Main Amplifier and Switch Functions

Schematic for main amplifier and description of switches.