4
5
6
7
BYPASS-1
REAR PANEL Break-Away
12
R122
J7
10.0K
1
3
5
4
3
2
1
10.0K
5
A7B
10.0K
TL072
+15-B
+15-B
C66
.1 m
10.0K
5.1M
1M
R135
C
R138
JUMPER-10x4
-15-B
3
10.0K
TL072
C58
7
6
NE5532
-15-B
R92
4:1
R117
100
1N5235B x 2
-15
D30 D27
R114
R109
2
2.2K
3
-15
12K
1K
R94
7
5
300
-15
LADDER_2
VTL5C2
R137
20.0K
100K
10.0K 10.0K 4.99K 1.5K
R32
R35
R37
R39
R41
R42
750
220
220
130
100
75
LADDER_1
-15
R69
R70
R73
100K
10.0K 10.0K 4.99K 1.5K
R75
R76
R79
R82
R84
R85
750
220
220
130
100
75
Slow
Fast
22uF 35V
4
8
5
4
5
4
9
0
M2
5
8
8
4.99K
P11
2
P10
-15
-
1
3
D26
6
7
5
RELEASE-2
+
METER OUT-2
+15
TL072
A6B
TL072
SW8A
2
U7A
7
+15
C49
LED3
R87
47uF 25V
Applied Research & Technology, Inc.
215 Tremont Street
C
Rochester, NY 14608
2.2K
Q6
2N4403 R89
10.0K
212-2-1.sch
Phone: (716) 436-2720 Fax: (716) 436-3942
C48
47uF 25V
-15
Size
C
Sheet # 1
of
2
A->B @ 133%
C:\\SERVER\D\PRODUCTS\212\212-1-1.SCH
Drawn By
Print Date 11:04:06
D. Pearce
11-Oct-2002
Rev.
E
Pro 2-Ch Tube/Vactrol Levelar - Main PCB
1st Use:
3
4
5
B
A6A
<- All Comparators
LM339AN
U7B
1
14
U7D
13
U7C
6
11
10
2
U6B
U6A
7
11
14
10
13
U6D
U5A
2
8
5
4
9
8
7
6
1
U5B
5
4
U5C
11
14
10
13
U5D
2
1
U4B
U4A
7
U4C
14
6
11
10
13
U4D
2
U3A
7
1
U3B
14
U3C
6
11
10
9
-1
Y
-2
R
R
-4
62K
3
On This Page
Off-Page conn.
2
10.0K
R105
10.0K
D25
+
+
-30 -25 -20 -15 -10 -6
47uF 25V
-15
R
R
C32
R
1
10.0K
-15
R
2. Shaded Ports are local, others connect to Power Supply (sheet #2)
R47
12
300
R
2N4403
Power Supply
METER-2
1uF 50V
R115
-15
47uF 25V
2.2K
Q3
0
NOTES
1. Unless otherwise marked:
Resistors 1/4W 5% C.F. ***3 sign. fig's =1/4W 1% M.F. ex. 10K=5% 10.0K=1%
Capacitors in uF Diodes are 1N4148 / 1N914
R46
R
-1
R107
C55
R106
+15
R86
R
-2
Y
-4
R
R
R
R
R
R
R
R
R
-30 -25 -20 -15 -10 -6
A
-15
C31
300
3
-
-15
+15
LED2
+15
3
+
13
12
12
R43
+15
-
<- All Comparators
LM339AN
GND-PWR
-15
SW6A
2
-
U3D
-15
R104
10.0K
SW8B
6
R132
10.0K
-15
5
3
A10A
NE5532
20.0K
2
-OUT-2
C65
R103
5
6
C62
+
-15
+15
SW6B
4
Output
Input
(Tube inverts)
47uF 25V
2
4.99K
3
R120
R68
C
1
1
3
-
-15
12
+
-15
9
3
-
GND
8
5
4
9
8
+15
12
6
1
C60
20.0K
R66
3
R131
2.2uF 50V
1
+15
C64
2.2K
2N4403
TL074
R136
10.0K
+15
+OUT-2
10uF 50V
R121
1M
10.0K
R99
WIPER_2
SW7A
R142
10.0K
C67
R140
-15
5
CV_OUT_2
A9D
R30
7
6
4.99K
CH2_BUFF
12
47uF 25V
5
MPSA29
CV_LINK_2
OUTPUT 2-TRS/UNBAL
NE5532
+15V
Q7
6
R126
A10B
10uF 50V
20.0K
6mA
-15
D33
Channel 2
C52
R95
4.99K
Q8
4.99K
R127
D
TL072
TUBE_OUT_2
R91
D31
R108
+15
100K
2
8
TL072
-15
A1A
7
V2-Filament
3
A9C
A1B
R97
12AT7
SW7B
4
1N5235B
9
TL074
2N4403
V2B
-
5
1
330pF m
1
14
R29
R90
Slow
Fast
13
-15
10.0K C45
D34
TL074
100K
Q9
3
ATTACK-2
220K
39K D29
-15
A9B
TL074
2
1M
R130
1M
6
10.0K
A9A
+15
D32
10.0K
R116
1
R98
10.0K
R129
R141
R125
300
R28
V2A
2
P4
6
7
R100
DET_LINK_2
D28
R112
VCT2
2
R27
220K
C46
20.0K
VR7
2:1 VR6
PL3
10uF 50V
+
P5
METER OUT-1
10.0K
C50
R96
47uF 25V
1
R26
100uF 63V
R6
4.99K
D3
+45V
SW3A
1uF 50V
62K
D1
C47
4
B
3
4
9
10K Lin
100K Lin
0dB
10
10uF 50V
3
R88
+12
100:1
+20dBm
R4
METER-1
NE5532
C53
3
300 R93
+15
OUTPUT-2
RATIO-2
C2
R5
2
A8A
THR_OUT
C56
5
4
3
2
1
0dBm
10K 15C
R3
20.0K 10.0K
R2
E
R23
10.0K
NE5532
10.0K
SW1A
SW3B
C54
2
10uF 50V R123
220K
A8B
1
2
3
4
5
6
7
8
9
10
PL4
1
10uF 50V
300
J5
TUBE_OUT_2
WIPER_2
3
Channel 2
+15-B
300
+15
4
R101
R102
-OUT-2
12
SW9D
2.2K
5
-20dBm
VR5
1
2
3
4
5
6
7
8
9
10
6
3
G
2
10
5
6
10uF 50V
Ch2 POTS PCB
THRESHOLD-2
THR_WIP_2
11
R124
A7A
100pF m
1
9
SW9C
C59
+OUT-2
25K Trim
-15-B
-15
10uF 50V
7
VR4
2
C57
6
8
4
THR_DRIVE_2
-15
1
OUTPUT 2-XLR
J6
5
SW9B
CH2_BUFF
1
2
3 -INPUT_2
4 +INPUT_2
5
6 +OUTPUT_2
7 -OUTPUT_2
8
+15
9
10
R119
R134
4
R139
10.0K
INPUT 2
TRS
7
R118
JP3
JW2
1
2
3
4
5
6
7
8
9
10
100pF m
6
1.5K
Red-90^
4
G
R128
10uF 50V
J8
JP4
C61
C63
8
2
R113
Byp.
4
3
RELEASE-1
Active
LED5
3
1
1
BYPASS-2
1
R1
2
Slow
Fast
TL074
CV_LINK_1
SW9A
5
6
CH1_BUFF
22uF 35V
-OUT-1
C23
A2A
-15
SW1B
4
Output
Input
20.0K
12
THR_OUT
2
INPUT 2-XLR
C13
R12
13
14
SW5D
C12
R19
1M
2N4403
A4D
4.99K
R10
2.2K 2.2uF 50V
Q2
-15
(Tube inverts)
2
R15
D10
4.99K 2N4403
47uF 25V
1
2
R24
+OUT-1
3
10uF 50V
SW2A
1
8
TL074
DET_LINK_2
WIPER_1
3
D24
100K
Q4
5
6
D12
A4C
300 R52
LADDER_1
SW5C
11
THR_WIP_2A
9
10
CV_OUT_2
8
9
10
THR_WIP_2
TL074
1N5235B
R54
SW5B
7
DET_LINK_1
TL074
5.1M
6
-15
A4B
-15
VTL5C2
5
CV_LINK_1
5
20.0K
C17
4
2
7
10.0K
A4A
+15
39K D13
6
10.0K
+15
6mA
-15
SW2B
4
R16
8
3
ATTACK-1
Slow
Fast
R8
R21
10.0K
10.0K
R65
4.99K
4
VCT1
220K
R11
1M
10.0K
R33
1K
C21
R20
MPSA29
4
300
12K
R14
R40
4
SW5A
4
CV_LINK_2
R36 D20
1
R111
300 R48
OUTPUT 1-TRS/UNBAL
D
-15
7
8
2
2
3
D21
R45
1
1.5K Red-90^ Link
4.99K
47uF 25V
5
8
10uF 50V
2.2K
R34
220K
3
R57
1M
R51
NE5532
6
R71
DET_LINK_1
D23 D22
A2B
10uF 50V
+15V
Q5
4
-15-A
R38
5
4
3
2
1
-15
1N5235Bx 2
TUBE_OUT_1
20.0K
V1-Filament
47uF 25V
C43
R72
330pF m
VR2
Channel 1
100K
7
6
J1
R110
C35
10.0K
VR3
R74
12AT7
C33
C34
R44
F
V1B
5
8
10uF 50V
300
Stereo
1
LED4
2
R55
1
C38
20.0K
A3A
-15
10uF 50V
LINK
Channel 1
+15-A
300
0dB
2:1
1
3
R49
A3B
NE5532
V1A
NE5532
C29
2.2K
7
6
100pF m
R50
2
R31
5
-15-A
C42
3
4
9
A5A
TL072
C37
4:1
100
220K
R56
+12
2
2
R80
R18
100
U6C
G
J2
1
25K Trim
R17
10uF 50V
OUTPUT-1
+20dBm 100:1
PL1
PL2
4
1M
3
11
5.1M
OUTPUT 1-BAL
VR8
4
.1 m
10.0K
TUBE_OUT_1
WIPER_1
-15
10.0K
1
+15
8
3
+OUT-1
12
RATIO-1
10K Lin
8
R77
R78
JUMPER-10x4
-15-A
R60
4
R81
10.0K
C44
10
11
SW4D
+
3
+15-A
INPUT 1
TRS/UNBAL
1
+15-A
1
2
3
4
5
6
7
8
9
10
100K Lin
TL072
SW4C
1
2
3
4
5
6
7
8
9
10
THR_DRIVE_2
THR_WIP_2A
9
0dBm
C36
R64
C30
VR1B -20dBm
10KD 15C
A5B
10.0K
-OUT-1
8
VR1A
CW
5
7
C28
10.0K
100uF 63V
10uF 50V
Ch1 POTS PCB
THRESHOLD-1
10uF 50V
6
CW
5
4
3
2
1
7
R59
10.0K
10uF 50V
J4
100pF m
6
5
SW4B
CH1_BUFF
1
2
3 -INPUT_1
4 +INPUT_1
5
6 +OUTPUT_1
7 -OUTPUT_1
8
+15
9
10
-
R67
4
JP1
JW1
1
2
3
4
5
6
7
8
9
10
R62
-15
11
C39
C41
G
JP2
1
1.5K
Red-90^
8
10.0K
2
Byp.
+
J3
F
E
SW4A
R63
R22
-
INPUT 1-XLR
3
8
+45V
Active
LED1
1
2
M2
3
M1
2
M1
1
6
212 - Pro VLA
7
Dwg #
212-4001-101
8
A