©2007 LOUD Technologies Inc. All rights re served
Bass Amplifi er PCB Schematics
PAGE 1
B-200R
12/15/05
05/30/06
C
WFB
WFB
0
1
4
CAUTION:
A
B
C
D
Tolerance:
Plot Time:
Plot Date:
E
N02128
F
4
2
NOTES:
1
Checked:
Drawn:
Released:
REV
Date
Sheet
1
of
NONE
3
Date:
5-9-05
Appvd by
3
1
A
B
C
D
E
F
2
Wed May 31, 2006
Drawing Title:
1901 Congressional, St. Louis, MO 63146
ST. LOUIS MUSIC, INC
3
Signatures:
Drawing Number:
07S673
BASS AMP
First Used On:
THE INFORMATION CONTAINED ON THIS DRAWING IS PROPRIETARY TO
Ecr(s)/Ecn(s)
Chgd By
Date
1) CAUTION: SHOCK HAZARD!!
Drawing Type: Schematic
Drawing Size:
CONTROL ISSUE
ADDED -02 ASSEMBLY
TOUCHING INTERNAL PARTS.
Class Code:
RLB
DESCRIPTION
3) VOLTAGES ARE MEASURED WITH 1 MEGOHM OSCILLOSCOPE
2) UNLESS NOTED, RESISTOR VALUES IN OHMS, 1/4W-5% TOL.
AND BE SURE POWER SUPPLY IS DISCHARGED BEFORE
THAT EXPLAINED IN THE OPERATING INSTRUCTIONS.
TO AVOID RISK OF ELECTRIC SHOCK, REFER SERVICING TO QUALIFIED
CAPACITOR VALUES IN MICROFARADS, 50V-10% TOL.
AND 10 MEGOHM DIGITAL VOLTMETER.
THIS UNIT CONTAINS HAZARDOUS VOLTAGE. DISCONNECT POWER
SERVICE PERSONNEL. DO NOT PERFORM ANY SERVICING BEYOND
THIS SCHEMATIC IS PROVIDED FOR USE BY QUALIFIED PERSONNEL.
12/15/05
05/30/06
C
WFB
WFB
0
1
4
CAUTION:
A
B
C
D
Tolerance:
Plot Time:
Plot Date:
E
N02128
F
4
2
NOTES:
1
Checked:
Drawn:
Released:
REV
Date
Sheet
1
of
NONE
3
Date:
5-9-05
Appvd by
3
1
A
B
C
D
E
F
2
Wed May 31, 2006
Drawing Title:
1901 Congressional, St. Louis, MO 63146
ST. LOUIS MUSIC, INC
3
Signatures:
Drawing Number:
07S673
BASS AMP
First Used On:
THE INFORMATION CONTAINED ON THIS DRAWING IS PROPRIETARY TO
Ecr(s)/Ecn(s)
Chgd By
Date
1) CAUTION: SHOCK HAZARD!!
Drawing Type: Schematic
Drawing Size:
CONTROL ISSUE
ADDED -02 ASSEMBLY
TOUCHING INTERNAL PARTS.
Class Code:
RLB
DESCRIPTION
3) VOLTAGES ARE MEASURED WITH 1 MEGOHM OSCILLOSCOPE
2) UNLESS NOTED, RESISTOR VALUES IN OHMS, 1/4W-5% TOL.
AND BE SURE POWER SUPPLY IS DISCHARGED BEFORE
THAT EXPLAINED IN THE OPERATING INSTRUCTIONS.
TO AVOID RISK OF ELECTRIC SHOCK, REFER SERVICING TO QUALIFIED
CAPACITOR VALUES IN MICROFARADS, 50V-10% TOL.
AND 10 MEGOHM DIGITAL VOLTMETER.
THIS UNIT CONTAINS HAZARDOUS VOLTAGE. DISCONNECT POWER
SERVICE PERSONNEL. DO NOT PERFORM ANY SERVICING BEYOND
THIS SCHEMATIC IS PROVIDED FOR USE BY QUALIFIED PERSONNEL.
H
4
IN
4
4
4
4
4
IN
-15V
4
OUT
+15V
-15V
+15V
1.0 V RMS
PA_INPUT
1.9V RMS
TO J4
TO J29
SEE SHT 1
POWER AMP
4
4
IN_A
C-GNDB
R40
47K
-16V
C55
H
TO J26
4
4
R35
5
D-GND
+88 VDC
R3
470K
1N914
75V PIV
D2
-16V
D22
16V
1N5353B
+16V
C6
100 pF
200V
C7
1
C4
1
D4
1N914
75V PIV
.047
C33
100V
100
35V
C39
R49
100
.047
C43
100V
.022
C11
R16
10K
R24
47K
CW
50K L
P2
BASS
R18
15K
R23
100K
33K
R21
22K
R20
C20
15 pF
200V
C21
1
R26
680
R77
120K
R27
33K
R82
22K
C47
22
BI-LEVEL
D1
JW52
1N914
75V PIV
D7
1
2
3
4
J26
100
250V
C53
5
D-GND
1M
R33
100K
R2
R1
22K
1
2
3
4
J4
C24
.1
400V
D12
16V
1N5353B
C5
.047
100V
R8
1K
100
35V
C40
R53
100
R10
22K
10K
R13
6
5
7
U1:B
TLO-74
C19
33 pF
200V
68K
R22
R32
33K
C22
1
R29
33K
OPT5
2
3
1
U2:A
NE5532
22K
R76
JW51
.047
C48
100V
R83
270
R30
2.2K
1
2
3
J32
1
2
3
4
5
6
7
8
J28
O
C
I
O
C
I
S2
ULTRA MID
HPGS
-16V
+16V
OUT_A
120 mV RMS
NOT USED
OUT_A
+6.8 VDC
+16V
FOR 07-673-01 / -02 ASSEMBLIES
PA_INPUT
4
4
1K
1/2W
1%
R37
6.81K
1/2W
1%
R78
IN_A
TO J33
SEE SHT 2
POWER SUPPLY
V2:A
12AU7
.047
C1
100V
100 pF
C2
200V
+38 VDC
OUT
R31
115 mV RMS
CW
GAIN
50K RA
P1
R7
1.5K
R5
22K
R6
47K
470K
R12
470K
R4
.022
C10
C9
.0033
100V
13
12
14
TLO-74
U1:D
22
C27
C18
680 pF
100V
R25
47K
C17
.0047
100V
CW
P4
50K L
HIGH MID
CW
P3
50K L
LOW MID
C15
.22
.022
C41
R17
680
R19
15K
C13
.22
1N914
75V PIV
D5
CW
P7
50K L
LINE OUT/HP LEVEL
1
3
2
J30
R81
270
HPGS
2.2
C12
OPT1
OPT4
2N5210
Q1
R34
270K
47.5K
1/2W
1%
R36
33.2K
1/2W
1%
R69
12AU7
V2:B
TIP
SLVE_SW
TIP_SW
SLEEVE
J1
0 dB
TIP
SLVE_SW
TIP_SW
SLEEVE
J2
15 dB
1.2V RMS
1N914
75V PIV
D3
O
C
I
O
C
I
S1
ULTRA LOW
9
10
8
TLO-74
U1:C
R9
22K
10K
R11
C8
1
CW
P5
50K L
TREBLE
22
C42
O
C
I
O
C
I
S3
ULTRA HIGH
220K
R15
3.3K
R14
C16
.033
C14
.22
CW
P6
10K A
MASTER
6
5
7
U2:B
NE5532
C49
22
75V PIV
1N914
D6
R28
4.7K
2N5210
Q2
TEST POINT CONDITIONS NOTE :
1 KHz INPUT SINEWAVE 120mV @ 0 dB
INPUT JACK. 120VAC LINE, VOLUME, GAIN & HP LEVEL @ "10"
TONES @ "5" , DC VOLTAGES WITH N0 SIGNAL APPLIED.
SLVE_SW
SLEEVE
TIP_SW
RING
RING_SW
TIP
J5
HEADPHONES
2
3
1
TLO-74
U1:A
Power Table
Ref Des
U1
U2
U3
Device(Type)
3707401_
3753201_
3753201_
Package
14DIP_3
8DIP_3
8DIP_3
-16VA
4
+15V
4
8
-15V
11
4
+16VA
8
