Vox AD15, AD15 30, AD15 30VT, AD30 Schematic

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AD15/30VT

CONTENTS

Circuit Diagram: Page 2-4
Block Diagram: Page 5-6
Parts List: Page: 7-11

2nd Edition

Issued date: December 9th 2004

Issued by: KORG INC.

INPUT JACK PCB

J1

PHONEJACK STEREO SW

D

C

PRESET WRITECH SELECT TAP

B

Shassis GND

V_VOL

G_VOL

+3VD

R37
10k

MANUAL FX BYPASS

SW1
PUSH SW

DGND

V_VOL

G_VOL

C65

0.1uF
ceramic

+3VD

CN1

FB1

1

1

2

2

FB-M

3

3

EH-3

C63

0.1uF

LED1
RED(3mm)

PRESET

KLM-2463

CN2

1
2
3

EH-3

R38
10k

SW2
PUSH SW

+15V

1

WD1
DA204K

R1

2

1
2

10k

3

R86

0

AGND

VR2

3

2

1

AMP TYPE

R31kR41kR51kR61kR71kR81kR91kR10

DGND

-15V

3

10kB(11click)

1

EFFECT TYPE

C36

0.01uF

LED2

RED(3mm)

3

VR3

2

R39
10k

SW3
PUSH SW

C1

0.1uF

10kB(11click)

C37

0.01uF

VR4
10kB

3

2

1

FX DEPTH

LED3
RED(3mm)

CH1 CH2MANUAL TAP

From POWER PCB

CN5

1

1

2

2

3

3

4

4

5

5

NC

6

6

7

7

8

8

EH-8

A

Shassis GND Shassis GND

+3VD +3VA

L3

BLM21P600SG

C57
100uF/6.3V

DGND

C69

C66

NU

0.1uF

1 2 3 4 5 6 78

+15V

C59
100uF/25V
C60
100uF/25V

R87

4.7(1/8W)

R92 0

AGND

-15V

C58
100uF/6.3V

AGND

DGND

C67

0.1uF

C68

0.1uF
R14 1M

13 12

HD74LVU04A

C53

8MHz

22pF

IC10F

X1

R13
1M

C38

0.01uF

R40
10k

SW4
PUSH SW

11 10

R67
100

C54

22pF

C30
10pF

3

GAIN

1

+15V

2

3

-15V

AGND

VR5
10kB

2

C39

0.01uF

LED4

RED(3mm)

IC10E

HD74LVU04A

C6

0.1uF

8

AGND

IC1A

4

UPC4570G2

C5

AGND

0.1uF

TREBLE

R93

100

3

2

VR1
10kB

1

2

NC

3
4
5
6
7
8
9
10
11
12
13
14
15
16

17
18
19
20
21
22
23
24

R42

27

R43 100k

28

R44 100k

29

R48 100k

30

R45 100k

31

R46 100k

32

R49 100k

33

R47 100k

34

94

NC

95
96
97
98

NC

99

35
77
85

25
50
64
75
100

0.1uF
1
26
36
51
65
76
78
86

DGND

7654321

6

7

5

IC2B

R55

NJM4556M

100k

FOOT_SW_R

PHONE_DT

DGND

DD7
DD6
DD5
DD4
DD3
DD2
DD1
DD0

100k

+3VD

C24

C25

0.1uF

DGND

C26

0.1uF

DGND DGND

+3VD

DGND

C27

C28

0.1uF

0.1uF

RXD
TXD

AGND

FOOT_SW_R

PHONE_DT

A/AB

RES_FRQ

FOOT_SW_L

C70

0.01uF

IC6

1

A14

26

A13

2

A12

23

A11

21

A10

24

A9

25

A8

3

A7

D7

4

A6

D6

5

A5

D5

6

A4

D4

7

A3

D3

8

A2

D2

9

A1

D1

A010D0

Vcc

27

WE

22

OE

20

GND

CS

UPD43256BGU-B12(SRAM256Kbit)

2.5V

C16

C17

C18

0.1uF

0.1uF

0.1uF

+3VD

C29

0.1uF

R52

DGND

100k
RXD
TXD

NC : No Connect

NU : No Use

Title

VOX

AD15VT & AD30VT

NumberSize Revision

A2

KLM-2462, 2463

Date Sheet of

2004.02.27

+3VA

L2

C47
10uF/16V

C8

0.1uF

R28

AGND

C46

220uF/16V

+3VD

100
100

R23
10k

NC

C22
1uF/50V

IC11

RESET

VCC

GND

HD74LV4040A

BLM21P600SG

IC3

1

RIN
LIN
VSS
VA
VD
DEMO0
DEMO1
SDTO

AK4552VT

P37/S-RDY3
P36/S-CLK3

P55/CNTR1
P54/CNTR0
P53/S-RDY2
P52/S-CLK2
P51/S-OUT2

P46/S-CLK1

R85
12k

R25
10k

SI2

P04/AN12
P05/AN13
P04/AN14
P07/AN15

P35/TxD3
P34/RxD3

P57/INT3

P56/PWM

P50/S-IN2

P42/INT1
P43/INT2
P44/RxD1
P45/TxD1

RESET

XOUT

AVss

CNVss

C45

0.01uF

R69

100NCNC

IC10D

HD74LVU04A

ROUT
LOUT
VCOM

BCLK
MCLK

LRCLK

SDTI

+3VD

R35
100k

FOOT_SW_L

44
43
42
41
49
50
51
52

4
5
6
7
8
9
10
11

21
20

NC

17
16
15
14
13
12

19

SYS_RES

23

NC

22

XIN

58

Vref

57

Vcc

24

Vss

59
18

R24
10k

DGND

F_SYS_RES

R71

R72 100

R70 100

R74 100

R73 100

2
3
4
5

AGND

6
7

8
R29
NU

0

R17
100k

NC
NC
NC

NC
NC

NC
NC

8
7
6
5

Q19CLK
Q2
Q3
Q4
Q5
Q6
Q7
Q8

Q9
Q10
Q11
Q12

AGND

45
46
47
48
60
61
62
63
64

1
2
3

33
34
35
36
37
38
39
40

56
55
54
53

25
26
27
28
29
30
31
32

IC7

NC
POW
OUT

M51957BFP

C7

0.1uF

IC4

M3803

NC

7
6

NC

5

NC

3

NC

2
4

NC

13
12

NC

14

NC

15

NC

1

NC

P03/AN11
P02/AN10
P01/AN9
P00/AN8
P67/AN7
P66/AN6
P65/AN5
P64/AN4
P63/AN3
P62/AN2
P61/AN1
P60/AN0

P17
P16
P15
P14
P13
P12
P11/INT01
P10/INT41

P30/DA1
P31/DA2
P32
P33

P27(LED7)
P26(LED6)
P25(LED5)
P24(LED4)
P23(LED3)
P22(LED2)
P21(LED1)
P20(LED0)

NC

IN

NC

GND4C

IC10C

5 6

SI2

P40/INT40/XCOUT

P41/INT00/XCIN

P47/S-RDY1/CNTR2

+3VD

1
2
3

DGND

9 8

HD74LVU04A

PDN

DSP_RES

RXD
TXD

M_CLK

R64

100

RXD
TXD

C62

47uF/6.3V

F_VPP

F_SYS_RES

100

16
15

NC

14
13
12
11
10
9

+3VD

M_CLK

FOOT_SW_L

PHONE_DT

R36
100k

R56

100

DSP_RES

SYS_RES

C64

0.1uF

C14

0.1uF

DGND

F_VPP

256FS

64FS

64FS

4FS

1FS

C49

C10

C9 0.1uF

DGND

C13

0.1uF

R91 0

256FS

0.1uF

F_OE

R81
47k

64FS

64FS

4FS

1FS

100uF/16V

AGND

SYS_RES

SYS_RES

64FS
256FS
1FS
SO2

+3VA

PHONE_DT

DSP_RES

DSP_RES

F_OE

100k

R41

IC8

1

NC NC

2
3

AK93C45AF

100

R65

100

R66

R90

10(1/8W)
V_VOL

V_VOL

DGND

G_VOL

G_VOL

64FS

256FS

1FS
SO2

WD3
DA204K

DGND

+3VD

NC
VCC
CS
SK4DI

F_SCK

F_BUSY

+3VD

+3VD

14

IC10

7

DGNDDGND DGND

R78
47k

GND

4FS
SO2
64FS

SI2

AGND

1

2

3

C48

10uF/16V

C44

0.01uF

HRE
HWE
HA0
HCS
HRD
HWR

C15

0.1uF

NC

DO

F_SCK

F_BUSY

DGND

4FS
SO2

64FS

SI2

C23

0.1uF

HD74LVU04A

8
7
6
5

C50

1uF/50V

R21

1.8k

AGND

R33
100k

R54
22k

AGND AGND

M_CLK

+3VD

DGND

DGND

R82

47k

R75

R32
100k

4FS
1FS

+15V

2

3

-15V

Q1
KTA2014

C3
100uF/6.3V

M_CLK

R79 47k
R80 47k
R83 47k
R84 47k

+3VD

CN4

1
2
3
4
5
6

EH-6

100

DGND

R53

10k

TP1
TP

4FS
1FS

HRE
HWE
HCS
HRD
HWR
HA0

8

4

DGND

1
2
3
4
5
6

C51
47pF

C12

0.1uF

AGND

NJM4556M

AGND

+3VD

NC

NC

NC
NC
NC

IC2A

1

C11

0.1uF

R22 1k

74
73

87

88
89
90
91

49
52
53
54
55

56
57
58
59
60
61
62
63

66
67
68
69
70
71
72

92
93

79
80
81
82
83
84

37
38
39
40
41
42
43
44
45
46
47
48

IC5

CLKIN
CLKOUT

RESET

INT4/WAKEUP
INT3
INT2
INT1

NC
P3
P2
P1
P0

HD7
HD6
HD5
HD4
HD3
HD2
HD1
HD0

HRE
HWE
HCS
HRD
HWR
HA0
HA1

HOLDRQ
HOLDAK

TDO
TICE
TCK
TDI
TMS
TRST

SI1
SIEN1
SCK1
SIAK1
SO1
SORQ1
SOEN1
SOEN2
SO2
SCK2
SIEN2
SI2

UPD77112

MASTER

C33

R2

1k

10uF/16V

C4

0.001uF

AGND

Q2
KTC2875

AGND

NC
DA13
DA12
DA11
DA10

DA9
DA8
DA7
DA6
DA5
DA4
DA3
DA2
DA1
DA0

D15
D14
D13
D12
D11
D10

D9

D8

D7

D6

D5

D4

D3

D2

D1

D0

BSTB

NU
MWR
MRD

I.C.
X/Y

IVdd
IVdd
IVdd

EVdd
EVdd
EVdd
EVdd
EVdd

GND
GND
GND
GND
GND
GND
GND
GND

C2

R26

10uF/16V

R12

1.2k

10uF/16V

AGND

1k

C43

0.01uF

R31
NU

R51
100k

DGNDDGND

3 4

R68
100

C56
22pF

C61

R89
12k

FOOT_SW_R

R59

100

R63 100

SYS_RES

IC10B

HD74LVU04A

0.1uF

R27 470

DGND

C21

DGNDDGNDDGND

470

C35
NU

AGND

+3VD

L1

BLM21P600SG

FOOT_SW_R

R34 100FX BYPASS
R60 100
R57 100
R61 100
R58
R62

SYS_RES

10

11

+3VD

16

8

C34
NU

R11 2.7k

NC
2

AGND

1

3WD5

DA204K

1

DA204K

C32

R19

1

6

15k

10uF/16V

5

VR6

VR7

10kB

10kB

3

3

2

2

1

1

MIDDLE

C40

C41

0.01uF

0.01uF

R16
10k

SW5
PUSH SW

LED5
RED(3mm)

M_CLK

M_CLK

C31

R18 47k

IC1B
UPC4570G2

BASS

LED6
RED(3mm)

2
NC

3

1

R20
10k

SW6
PUSH SW

10pF

VR8

10kB

2

3WD6

7

LEVEL

C42

0.01uF

RES_FRQ

A/AB

R30
NU

R50
100k

R15

IC10A

1 2

HD74LVU04A

X2

11.2896MHz
C55
22pF

R88 3.3k

3

1

1M

VR9
10kB

2

RES_FRQ
A/AB

+3VD+3VD

C52
22pF

19
18
17
16
15
13
12
11

28

14

5

4

C72

0.1uF

F_SYS_RES

F_VPP

F_BUSY

F_OE

F_SCK

DD7
DD6
DD5
DD4
DD3
DD2
DD1
DD0

C19

0.1uF

IC9

NJM2872AF

8

To POWER PCB

DGND

A/AB
RES_FRQ

FOOT_SW_L

C71

0.01uF

+3VD

VIN

VOUT

V OUT

V IN
VSS

GND

CE3NC

NS BP

CONTROL

F_SYS_RES
F_VPP
F_BUSY
F_OE
F_SCK

R76
R77 100

CN3

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

9

9

EH-9

1
2

DGND

NC

100

DGND

MAIN PCB

1.51

1/2

D

C

B

+3VD

C20

0.1uF

CN6

1
2
3
4
5
6
7
8
9
10

EH-10

A

7654321

C12

C13

0.001uF

47pF

ceramic

IC1C

C8

1uF/50V

R8
10k

1uF/50V

-15V

C38
100uF/25V

C39
100uF/25V

R64

22k

C2

4.7uF/50V

-15V

R41
330

Q3
KTC3198

-15V

R30

68k

+3VD

2

BG
R24
33k

7

AG
R28
33k

+3VD

C25

0.1uF

POWER

DG211

D3 S3

10 11

IN3

C49

0 : ON

9

0.22uF/50V

1 : OFF

R65

10k

Q8

R62

KTC3198

22k

C9

1uF/50V
V1A
12AX7

AH

HEATER1

HEATER1

HEATER2

HEATER2

C32
47uF/25V

-15V

R36
V1B

3.3k

12AX7

+15V

IC1

13

V+

VL

5

GND

C6

0.1uF

4

V-

ceramic

-15V

DG211
Vishay Siliconix

POWER SUPPLY BLOCK

To MAIN PCB

AGND

1
2
3
4
5

NC

6

DGND

7
8

Shassis GND

C40
100uF/6.3V

R55

0

BK
345

8

AK

LED1
RED(5mm)

BH

+15V

D12
1N4002

D13
1N4002

-15V

1

BP

CH
9

R42

5.6k

AP

6

12

+3VD

R31

330k

C5

0.1uF
ceramic

CN3

1
2
3
4
5
6
7
8

EH-8

R70
47k

R33

330k

IC2B
NJM2082D
7

C61

0.1uF

ceramic ceramic

R32

330k

C15

0.1uF

+15V

ceramic

8

2

1

3

IC2A

C14

4

NJM2082D

0.1uF

-15V
ceramic

R34

6

330k

5

C57

C58

C59

0.1uF

0.1uF

0.1uF

0.1uF

ceramic ceramic ceramic ceramic

Shassis GND

Shassis GND

Shassis GND

C62

0.1uF

If the output power is not high enough, please delete both R67 and R68.

Even doing above modify, if the output power is not go to correct level, please exchange the TUBE itself.

C52

0.1uF
ceramic

+15V

Q9

KTC3198

C26

22uF/35V

R35

3.3k

NU

C60

R67

R66

C66
10pF

ceramic

R13
0

C11

C27

22uF/35V

R43

4.7k

16k

R68

3.3k

R63

220k

2.2k

-15V

ADJUSTMENT RESISTOR
(Delete=6dB up)

PHONE_DT

FOOT_ SW_R

FOOT_SW_L

C53

47uF/35V

+3VD

R53
10k

Q6
KTC3198

R37
100k

PHONE_DT

FOOT_ SW_R

FOOT_SW_L

R71 47k_F(1%)

VR1A

R14

100kB

3

Max

2.2k

POWER LEVEL

Q7
KTA1266

R60
10k

2

6

5

R57

1k

IC3A
NJM2082D

1

Min

C42

10uF/25V

1

C51

3pF

NJM2082D

R17

2.2k
+15V

C43

-15V

C41

0.01uF

ceramic

R15

2.2k

ceramic

IC3B

8

4

LINE OUT

3

10uF/25V

+3VD

Max

7

2

3

D8
1N4148

D9
1N4148

C28
10uF/35V

Q5

KTC2874

R72

47k_F(1%)

VR1B
100kB

2

R25
10k

R44

1.8k

Min

LINE OUT

PRE OUT

R10

10k

R45

2.2k

+

R18

1

2.2k

C33
47uF/35V

+3VD

10

9

ceramic

C17

0.1uF

+Vcc(+30V)

C16

0.1uF

7

ceramic

C47 NU

R73
47(1W)

R61
47(1W)

R22
10k

C29

220uF/35V

14

1,5

LM3886

IC4

R48

3

0.47(3W)

8

R12
22k

C30

220uF/35V

-Vss(-30V)

22k

R29

C34

PRE OUT

R46
10 (1W)

ceramic

C35

0.22uF

NU

R16

0

ceramic

ceramic

C50

0.1uF

C7

0.1uF

+

C54

100uF/25V

C48

100uF/25V

+3VD

+3VD

R58
470

R59
1k

FB2

C55

FB-M

22pF

ceramic

FB1

C46

FB-M

22pF

ceramic

R56
10k

D14

R69

1N4148

10k

D15
1N4148

D10

R11

1N4148

10k

D11
1N4148

NC : No Connect
NU : No Use

Title

VOX

Size Number Revision

A2

Date Sheet of

2004.2.6

CN2

1

1

2

2

VH-2

1
2
3
4
5
6

C63

0.1uF ceramic

Shassis GND

PHONE_JACK STEREO

C64

0.1uF ceramic

Shassis GND

AD30VT POWER PCB

KLM-2464

R19

470k

C3

IC1A

0.1uF
DG211

R2

D1 S1

1k

2 3

IC1B
DG211

D2 S2

15 14

R27

47k

IC1D
DG211

C65
NU

D2
1N4002

1 3

VV

OUT

IN

GND

IC5

2

7815

ceramic

IC6

1

7915

GND

2

OUT3IN

D5
1N4002

C24

0.1uF

ceramic ceramic

R54
470

CN4

1

1

2

2

3

3

EH-3

IN1

0 : ON

1

1 : OFF

R23

47k

IN2

16

0 : ON
1 : OFF

R26

2.2k

C10

D4S4

76

IN4

8

0 : ON
1 : OFF

C22

0.1uF
ceramic

C23

0.1uF
ceramic

D6
1N4002

1 3

VV

OUT

IN

GND

IC7

2

BA033T

CN5

1

1

2

2

3

3

EH-3

D

+15V

R1
1k

C1
100uF/35V

From MAIN PCB

CN1

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

FOOT_SW_R

9

C

B

1

10

2

A

1 2 3 4 5 6 78

9

EH-9

POWER

SW1
SW-SPST

F1

12

FUSE

Chassis GND

R47 10 (1W)

C44

0.22uF
ceramic

D3 1N4002

D4 1N4002

Chassis GND Circuit GND

LINE OUT

PHONE_DT

FOOT_SW_L

DGND

PRE OUT

PRE OUT

AGND

FOOT_SW_R

LINE OUT

PHONE_DT

FOOT_SW_L

3

1

4

2

5

3

6

4

7

8

5

9

C31

10uF/16V

F2

FUSE

R38

KTC3198GR

47k

Q1

R3

4.7k

D1
KBP206G

D7
SHSW04M

R51

100(1W)

R52

100(1W)

R5

4.7kR64.7k

Q2

KTC3198GR

R39
33k

-15V

A/AB

0 : A
1 : AB

+VCC(+30V)

C36

2200uF/50V

C37

2200uF/50V

-VSS(-30V)

HEATER1

HEATER2

RES_FRQ

R4

4.7k

C18

0.1uF

ceramic

C19

0.1uF

10uF/16V

HEATER1

HEATER2

C4

R9

22k

10uF/16V

R49

330(1W)

R50

330(1W)

C45
2200uF/16V

C56

C67

3.3uF/50V

C68

3.3uF/50V

R20

220

R21

220

+3VD

R7
22k

Q4
KTA1266

R40
47k

-15V

C20

0.1uF

C21

0.1uF

ceramicceramic

8

POWER BLOCK

SP1
8ohm

10 INCH

PHONE / LINE OUT

J2

PHONE_JACK_SW

J1

FOOT SW

2/2

D

C

B

A

1.61

7654321

C12

C13

0.001uF

47pF

ceramic

IC1C

C8

1uF/50V

R8
10k

1uF/50V

-15V

C38
470uF/25V

C39
470uF/25V

R64

22k

C2

4.7uF/50V

-15V

R41
330

Q3
KTC3198

-15V

R30

68k

+3VD

2

BG
R24
33k

7

AG
R28
33k

+3VD

C25

0.1uF

POWER

DG211

D3 S3

10 11

IN3

C49

0 : ON

9

0.22uF/50V

1 : OFF

R65

10k

Q8

R62

KTC3198

22k

C9

1uF/50V
V1A
12AX7

AH

HEATER1

HEATER1

HEATER2

HEATER2

C32
47uF/25V

-15V

R36
V1B

3.3k

12AX7

+15V

IC1

13

V+

VL

5

GND

C6

0.1uF

4

V-

ceramic

-15V

DG211
Vishay Siliconix

POWER SUPPLY BLOCK

To MAIN PCB

AGND

1
2
3
4
5

NC

DGND

6
7
8

Shassis GND

C40
100uF/6.3V

R55

0

BK
345

8

AK

LED1
RED(5mm)

BH

+15V

D12
1N4002

D13
1N4002

-15V

1

BP

CH
9

R42

5.6k

AP

6

12

+3VD

R31

330k

C5

0.1uF
ceramic

CN3

1
2
3
4
5
6
7
8

EH-8

R70
47k

R33

330k

IC2B
NJM2082D
7

C61

0.1uF

ceramic ceramic

R32

330k

C15

0.1uF

+15V

ceramic

8

2

1

3

IC2A

C14

4

NJM2082D

0.1uF

-15V
ceramic

R34

6

330k

5

C57

C58

C59

0.1uF

0.1uF

0.1uF

0.1uF

ceramic ceramic ceramic ceramic

Shassis GND

Shassis GND

Shassis GND

C62

0.1uF

C52

0.1uF

+15V

ceramic

Q9

KTC3198

C26

22uF/35V

R35

3.3k

NU

C60

R67

C66

18k

10pF

ceramic

C27

22uF/35V

ADJUSTMENT RESISTOR

R13
0

C11

Delete=6dB up

R43

R68

3.3k

2.7k

PHONE_DT

FOOT_ SW_R

FOOT_SW_L

R14

C53

22uF/35V

7.5k

R66

R63

220k

2.2k

-15V

+3VD

Q7
KTA1266

R53
10k

R60
10k

Q6
KTC3198

R37
100k

PHONE_DT

FOOT_ SW_R

FOOT_SW_L

R19

470k

C3

IC1A

0.1uF
DG211

R2

D1 S1

1k

2 3

IC1B
DG211

D2 S2

15 14

R27

15k

IC1D
DG211

C65
NU

D2
1N4002

1 3

VV

OUT

IN

GND

IC5

2

7815

ceramic

IC6

1

7915

GND

2

OUT3IN

D5
1N4002

C24

0.1uF

ceramic ceramic

R54
470

CN4

1

1

2

2

3

3

EH-3

IN1

0 : ON

1

1 : OFF

R23

15k

IN2

16

0 : ON
1 : OFF

R26

2.2k

C10

D4S4

76

IN4

8

0 : ON
1 : OFF

C22

0.1uF
ceramic

C23

0.1uF
ceramic

D6
1N4002

1 3

VV

OUT

IN

GND

IC7

2

BA033T

CN5

1

1

2

2

3

3

EH-3

D

+15V

R1
1k

C1
100uF/35V

C80

0.0056uF

From MAIN PCB

CN1

1

1

2

2

3

3

4

4

5

5

6

6

7

7

8

8

FOOT_SW_R

9

C

B

1

10

2

A

1 2 3 4 5 6 78

9

EH-9

POWER

SW1
SW-SPST

F1

12

FUSE

Chassis GND

R47 10 (1W)

C44

0.22uF
ceramic

D3 1N4002

D4 1N4002

Chassis GND Circuit GND

LINE OUT

PHONE_DT

FOOT_SW_L

DGND

PRE OUT

PRE OUT

AGND

FOOT_SW_R

LINE OUT

PHONE_DT

FOOT_SW_L

3

1

4

2

5

3

6

4

7

8

5

9

C31

10uF/16V

F2

FUSE

R38

KTC3198GR

47k

Q1

D1
KBP206G

D7
SHSW04M

R51

100(1W)

R52

100(1W)

R5

4.7kR64.7k

Q2

KTC3198GR

R39
33k

-15V

R3

4.7k

C82

0.0068uF

A/AB

0 : A
1 : AB

+VCC(+20V)

C36

2200uF/35V

C37

2200uF/35V

-VSS(-20V)

HEATER1

HEATER2

C81

0.0056uF

RES_FRQ

R4

4.7k

C18

0.1uF

ceramic

C19

0.1uF

HEATER1

HEATER2

10uF/16V

33(1W)

33(1W)

C45
2200uF/16V

R9

22k

R49

R50

C4

C56

10uF/16V

470uF/35V

470uF/35V

R20

220

R21

220

+3VD

R7
22k

Q4
KTA1266

R40
47k

-15V

C67

C20

0.1uF

C68

C21

0.1uF

ceramicceramic

How to adjisut the output power (WATT)

1. Delete R67 and R68 ->6dB UP

2. Delete R74 and R78 ->11dB UP

3. Delete R72 and R77 ->16dB UP

4. Delete R71 and R76 ->21dB UP

5. Delete R12 and R75 ->26dB UP
Please try to increase the power by above order(1-5).

Even doing above modification ,If POWER is not go
to correct wattage, please exchange the TUBE itself.

R15

C28
10uF/35V

Q5

C33

47uF/35V

R25
10k

R44

1.2k

LINE OUT

PRE OUT

R10

10k

+Vcc(+20V)

C16

C29

220uF/35V

0.1uF
ceramic

5

1

2

3

C17

220uF/35V

0.1uF
ceramic

-Vss(-20V)

160k

R29

R45
1k

C47 NU

ceramic

R12

160k

+

R71

82k

R72

39k

R74 20k

C34

NU

R18

+

100k

R16

0

R73

C54

100uF/25V

47(1W)

R61

C48

100uF/25V

47(1W)

PRE OUT

+3VD

R22
10k

C50

0.1uF

ceramic

C7

0.1uF

ceramic

6

5

R57

1k

IC3A
NJM2082D

1

C42

10uF/25V

100k

C51

NU

NJM2082D

R17

7.5k
+15V

C43

-15V

C41

0.01uF

ceramic

IC3B

8

4

LINE OUT

10uF/25V

+3VD

7

2

3

D8
1N4148

D9
1N4148

KTC2874

4

IC4
LM1875

C30

<---------D--------->

A+B+C+D delete=20dB up

<---------C--------->

A+B+C delete=15dB up

<---------B--------->

A+B delete=10dB up

<---------A--------->

A delete=5dB up

R56
10k

+3VD

D14
1N4148

D15
1N4148

+3VD

D10
1N4148

D11
1N4148

1

R69
10k

R11
10k

VOX

2004.1.9

C55
22pF

ceramic

C46
22pF

ceramic

1

2

2

VH-2

R46

10 (1W)

R58 150k

R75 130k

R76 56k

R77 16k

R78 1.1k

1
2
3
4
5
6

C63

0.1uF ceramic

Shassis GND

PHONE_JACK STEREO

C64

0.1uF ceramic

Shassis GND

AD15VT POWER PCB

KLM-2464

0.47(3W)

FB2

FB-M

FB1

FB-M

NC : No Connect
NU : No Use

Title

Size Number Revision

A2

Date Sheet of

CN2

R48

8

POWER BLOCK

SP1
8ohm

8 INCH

C35

0.22uF

R59
10k

PHONE / LINE OUT

J2

PHONE_JACK_SW

J1

FOOT SW

2/2

D

C

B

A

0.6