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4-18-05-
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INITIAL ISSUE - -
of 2 2NONE8/17/04 Date:
Ecr(s)/Ecn(s)-
Appvd by Date
5 4
A A
B B
C C
D D
E E
Plot Date: Checked:
Released:
F F
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G
5 4 31
2
SCHEMATIC - PREAMP3 1
2
NOTES:Date
Drawing Number:
Class Code: Drawing Type: Schematic
1901 Congressional, St. Louis, MO 63146
REM
ST. LOUIS MUSIC, INC THE INFORMATION CONTAINED ON THIS DRAWING IS PROPRIETARY TO
Chgd By DESCRIPTION
AND 10 MEGOHM DIGITAL VOLTMETER. 1) CAUTION: SHOCK HAZARD!!
TOUCHING INTERNAL PARTS. CAUTION:
Tolerance:
Drawing Title: First Used On:
Drawing Size:-
Signatures: Tue Apr 26, 2005
07S115
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 SERVICE PERSONNEL. DO NOT PERFORM ANY SERVICING BEYOND
THIS SCHEMATIC IS PROVIDED FOR USE BY QUALIFIED PERSONNEL. CAPACITOR VALUES IN MICROFARADS, 50V-10% TOL. THAT EXPLAINED IN THE OPERATING INSTRUCTIONS.
THIS UNIT CONTAINS HAZARDOUS VOLTAGE. DISCONNECT POWER TO AVOID RISK OF ELECTRIC SHOCK, REFER SERVICING TO QUALIFIED4-18-05-
-
A
C
- Plot Time: Drawn: REV
Sheet
INITIAL ISSUE - -
of 2 2NONE8/17/04 Date:
Ecr(s)/Ecn(s)-
Appvd by Date
5 4
A A
B B
C C
D D
E E
Plot Date: Checked:
Released:
F F
-
G
G
5 4 31
2
SCHEMATIC - PREAMP3 1
2
NOTES:Date
Drawing Number:
Class Code: Drawing Type: Schematic
1901 Congressional, St. Louis, MO 63146
REM
ST. LOUIS MUSIC, INC THE INFORMATION CONTAINED ON THIS DRAWING IS PROPRIETARY TO
Chgd By DESCRIPTION
AND 10 MEGOHM DIGITAL VOLTMETER. 1) CAUTION: SHOCK HAZARD!!
TOUCHING INTERNAL PARTS. CAUTION:
Tolerance:
Drawing Title: First Used On:
Drawing Size:-
Signatures: Tue Apr 26, 2005
07S115
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 SERVICE PERSONNEL. DO NOT PERFORM ANY SERVICING BEYOND
THIS SCHEMATIC IS PROVIDED FOR USE BY QUALIFIED PERSONNEL. CAPACITOR VALUES IN MICROFARADS, 50V-10% TOL. THAT EXPLAINED IN THE OPERATING INSTRUCTIONS.
THIS UNIT CONTAINS HAZARDOUS VOLTAGE. DISCONNECT POWER TO AVOID RISK OF ELECTRIC SHOCK, REFER SERVICING TO QUALIFIED
TO POWER AMPTO POWER AMP
213J4
XFRMR L/O BAL
R59221.0
1/8W
1% R58470
PRE EQ
R63100
1KR84 R941.5K C34 .1
50V C35 22
35V TO SHEET 1
R5439K C39 .22
100V R73470
470KR76
1KR86
R961K
R5268K
CW
P1350K L
LEVEL 4 CW
P1150K L
LEVEL 2 CW
P1050K L
LEVEL 1
D11 1N914
75V PIV
.047C49100V
C40 .0022
100V
1KR87
R511.1M
R99470
.015C47100V
C43 .0015
100V
1KR85
R102250
10W
5per
SLVE_SWSLEEVE TIP_SW RINGRING_SW
TIP
J5TUNER OUT
#2
#8#7 #9
#44:1 T1
1:1
.47C46100V
C36 .1
50V D14 1N914
75V PIV
65
7IC3:B
TLO-74 D15 1N914
75V PIV
C42 .1
100V
.15C48100V 22KR81
CW
P1250K L
LEVEL 3
C57 100 pF
200V
D12 1N914
75V PIV C58 220
350V
1KR79
CW
1M AP15 TUBE GAIN
C62 330
100V
1234 J10
SLVE_SWSLEEVE TIP_SW RINGRING_SW
TIP
J6
L/O BAL/UNBAL
123456
J7
PULL = GND LIFT
POST EQ
TO SHEET 1
EQ SWITCH -16V DIRTY GND-65V 300V
R55220
R60221.0
1/8W
1%
O
C
IS6:A
PRE/POST
1KR80 C45 .033
100V
C41 .015
100V
POWER
D21 GRN C37 .022
50V C38 22
35V
R724.7K
R82470
R1001.1M
65
7IC4:B
TLO-74
23
1IC4:A
TLO-74
22KR83
R97680K
C56 100 pF
200V
50V C501
1312
14IC3:D
TLO-74
CW
1M AP8
1 KHz - 6 KHz
910
8IC4:C
TLO-74 TO SHEET 1
TUBE GAIN +16V
20mV p-p ripple
-25 VDC
CW
10K AP4:A LINE OUT LEVEL
O
C
IS6:B PRE/POST 0 VDC 180mV p-p LINE OUT BOARD
( BREAK-OFF)
C44 .033
100V
470R78
1312
14IC4:D
TLO-74
CW
P91M A
30-150 Hz
910
8IC3:C
TLO-74
CW
50K AP6
MASTER VOLUME
0 VDC .1 VAC p-p
470R77
CW
P51M A
600-1 KHz
23
1IC3:A
TLO-74
R9310K
R9512K
0 VDC .6 VAC p-p
R5327K
R9810K
2W
10K AP4:B
LINE OUT LEVEL
123456
J8
1234567891011 J9
FOOT SWITCH EFFECTS RET EFFECTS SENDPREAMP OUT
TUBE BOARD ( BREAK-OFF)
CW
P71M A
150-600 Hz MUTE
FOOT SWITCHSIGNAL GND
0 VDC .65 VAC p-p
