Alto AMictube User manual

Service Manual

www.altoproaudio.com

Version: 1.1

Model: aMICTUBE

STEREO TUBE PREAMP

CONTENTS

1. Specification………………………………………….1

2. Block Diagram………………………….…………… 1

3. Schematic Diagram..…………………………..…….3

4. Printed Circuit Board……………………………….11

5. Wiring Diagram…………………………………..….1

6. Test Procedure………………………………….…… 2

7. Electrical Parts List………………………………… 11

8. Exploded Views………………………………..…….1

9. Notes…………………………………………….……

Input

XLR Impedance 5K Ohm

1/4”High Z 1M Ohm

Connectors NeutrikTM Combo

Output

XLR Balanced 100 Ohm

1/4”Unbalanced 100 Ohm

Panel Controls

Tube Drive 0dB to +40dB

Gain 0dB to +30dB

Phase Reverse

20 dB Pad

+48V Phantom Power

Performance

THD+Noise <0.5%

Signal To Noise >90dB

Power Supply Rejection >98dB

Amplifier Type Dual Servo

Meter

8-Digit LED -24dBu to +18dBu

Physical

Weight 1.05Kg

Dimensions

131(W)X116(D)X44(H)mm(5.16”X4.57”X1.7”)

Chassis Steel

Panel Brushed Aluminum(?LTO®Style)

Power Supply

Type Linear,External

Input 18VAC

Power 14Watts

Transformer External Wall Mount

1234

4321

Block Diagram

U1(INA163)

TUBE-12AX7

X3 U2(INA163)

POWERSUPPLY

VOLTAGEREGULATOR AC18V

+12VDC

+15VDC

-15VDC

+48VDC

PHANTOM

CH1MICROPHONEINPUT

CH2MICROPHONEINPUT

CH1OUTPUT

CH2OUTPUT

PHASE

+ PAD(20dB)

1 2 3 4 5 6 78

7654321

C64

104P

C65

104P

C66

10U

C67

10U

U11C

2068DD

-15V

+15V

TR9

R39

47K5

TR8

R38

47R 1/4W

+15V

103P

LD17

LD18

GR LD19

LD20

SW2C

PS-42E85L

SW3C

PS-42E85L

SW4A

PS-22E85L

SW5A

PS-22E85L

LD21

RED LD22

RED

SW1B

PS-42E85L

(PWRON)

(PHANTOM)

(PAD-CH1)

(PAD-CH2)

(PHASE-CH2)

(PHASE-CH1)

914

U9C

LM339

11 13

U9D

LM339

U9B

LM339

U9A

LM339

914

U10C

LM339

11 13

U10D

LM339

U10B

LM339

U10A

LM339

LD9

LD10

LD11

LD12

LD13

LD14

LD15

YEL

LD16

RED

TR6

47K5

TR5

100R 1/4W

+15V

R104

100R

R105

200R

R106

402R

R107

806R

R108

1K58

R109

3K24

R110

6K34

R111

8K06

+15V

R103

110R

-15V

914

U7C

LM339

11 13

U7D

LM339

U7B

LM339

U7A

LM339

914

U8C

LM339

11 13

U8D

LM339

U8B

LM339

U8A

LM339

LD1

LD2

LD3

LD4

LD5

LD6

LD7

YEL

LD8

RED

TR4

47K5

TR3

100R 1/4W

+15V

R95

100R

R96

200R

R97

402R

R98

806R

R99

1K58

R100

3K24

R101

6K34

R102

8K06

R94

110R

-15V+15V

C50

104P

C53

104P

OUTPUT1 OUTPUT2

103P

U11A

2068DD

R49

47K5

R72

1K00

R17 47K5

C62

1uF

-15V

U11B

2068DD

DA204K

R50

47K5

R74

1K00

R18 47K5

C63

1uF

-15V

312

U10E

LM339

312

U9E

LM339

312

U8E

LM339

312

U7E

LM339

+15V

-15V

C57

104P

C60

104P

C56

104P

C59

104P

C52

104P

C55

104P

C51

104P

C54

104P

(-24)

(-18)

(-12)

(-6)

(0)

(+6)

(+12)

(+18)

DA204K

D5A

DA204K D6A

DA204K

CN8-14

CN9-14

1 2

3 4

5 6

7 8

910

11 12

13 14

15 16

CN8 HEADER8X2

1 2

3 4

5 6

7 8

910

11 12

13 14

15 16

CN9 HEADER8X2

CN8-1 CN8-2

CN8-3 CN8-4

CN8-6

CN8-8

CN8-10

CN8-12

CN8-14

CN8-16

CN8-5

CN8-7

CN8-9

CN8-11

CN8-13

CN8-15

CN9-1

CN9-3

CN9-5

CN9-7

CN9-9

CN9-11

CN9-13

CN9-15

CN9-2

CN9-4

CN9-6

CN9-8

CN9-10

CN9-12

CN9-14

CN9-16

CN8-15

CN8-2

CN8-16

+48V+15V

CN9-15

CN9-2

CN9-16

+48V-15V

SW1A

PS-42E85L

PHANTOM ON (+48V)

PHANTOM OFF

+48V

47K5 CN8-1

SW1C

PS-42E85L

+48V

47K5

CN9-1

R19

619R

R33

619R

SW2D

PS-42E85L

SW2B

PS-42E85L R31

169R

R20

619R

R34

619R

SW3D

PS-42E85L

SW3B

PS-42E85L R32

169R

CN8-3

CN8-4

CN8-5

CN8-6CN9-6

CN9-5

CN9-4

CN9-3

VR1 A20K

(CH1 INPUT GAIN)

VR2 A20K

(CH2 INPUT GAIN)

CN8-7 CN8-8

CN9-8CN9-7

R64

100R

VR3B

C1K2P

R82

100R

R25

100R

VR3A

C1K2P

R81

100R

CN8-10

CN8-9

CN8-12

CN8-11

R66 100RVR4B C1K2P

R65

100R

R45 100RVR4A C1K2P

R67

100R

CN9-10

CN9-9

CN9-12

CN9-11

SW4B

PS-22E85L

( PHASE )

SW5B

PS-22E85L

( PHASE )

CN8-10

CN8-14

CN8-13

CN9-10

CN9-14

CN9-13

VCH1-IN

VCH1-OUT

GND

+48V

+12V

VCH2-IN

VCH2-OUT

R121

10K0

R120

10K0

PT2

GT2

KT2

HT2 HT1 PT1

GT1

KT1

TB1 TUBE-12AX7

CN4

CON8

R122

10R

R123

4K53

+15V

AMTUBEFP.Sch

Titel

Size

File:

Date: Drawn By:

Sheet

RevisionModel No:

7-Mar-2002 C.C.LIN

ALTO Mobile : ALPHAMICtube FRONT PANEL BOARD

11of

ALPHAMICtube VER020307

1 2 3 4 5 6 78

7654321

11 3

121014

INA163

R47

2K21 C22

10U

R21

20K0

R22

20K0 ZD4

ZD3

ZD2

ZD1

C11

47/63VZ

C12

47/63VZ

U6A

2068DD

C35

104P

C36

104P

R13

402R

R15

1M00

104P

R35

51R1

C30

104P

C31

104P C23

10U

C20

10U

C21

10U

-15V

+15V

C18

220P

1. H2 = Zener Diode MMSZ5242BT1NOTE: 2. LOW BUMP ON

3. LOW BUMP OFF C9,C12,C39,C42=104P R21,R32=4K99 R73,R28=200K

C9,C39,R21,R66 =0R OMIT:C12,C42,R28,R32,R73,R77

R27

10R0

R28

10R0

11 3

121014

INA163

R48

2K21 C24

10U

R23

20K0

R24

20K0 ZD8

ZD7

ZD6

ZD5

C13

47/63VZ

C14

47/63VZ

C32

104P

C33

104P C25

10U

-15V

+15V

C19

220P

R29

10R0

R30

10R0

PS:H2=MMSZ5242

411

U3E

TL074CD

-15V

+15V

U6B

2068DD

R14

402R

R16

1M00

C10

104P

R36

51R1

U4A

TL074CD

R55 10K0

R56

10K0

R63

1K00 R61

10K0

U6C

2068DD

C58

104P

C61

104P

C71

10U

C72

10U -15V

+15V

HR=MMBT3906LT1 / 2SA1036K(R)

CH1-INX3

CH1-INX2

CH1-INT

CH1-INTS

CH2-INTS

CH2-INT

CH2-INX2

CH2-INX3

CH1-OUT

C46

100P

R62

100R

R26

301K

R70

301R

C15

0.47U

C40

0.47U

R44

1M00

R71

301R

U3C

TL074CD

13 14

U3D

TL074CD

R42

1M00

C45

100P

R83

100R

R68

301K

R76

1M00

C41

0.47U

C17

0.47U

R43

1M00

U3B

TL074CD

U3A

TL074CD

R41

1M00

104P

U4B

TL074CD

C48

R73R85

C47

R86

LOW BUMP

CN3

CON8

U4C

TL074CD

R53 10K0

R52

10K0

R57

1K00

R54

10K0

CH2-OUT

C16

100P

R37

100R

R69

301K R51

301R

C43

0.47U

C42

0.47U

R78

1M00

R84

301R

U5C

TL074CD

13 14

U5D

TL074CD

R75

1M00

C26

100P

R40

100R

R46

301K

R80

1M00

C44

0.47U

R77

1M00

U5B

TL074CD

U5A

TL074CD

R79

1M00

C27

104P

13 14

U4D

TL074CD

C29

R59R58

C28

R60

LOW BUMP

+48V+12V

X2 X1

COMB-XLR

CH1-INPUT

169R1/4W

R9 6K81

R10 6K81

100/63V

X2 X1

COMB-XLR

CH2-INPUT

R11 6K81

R12 6K81

100/63V

169R1/4W

CN5

7P-2.0

+48V

GND

+15V

-15V

CH1-OUT

CH2-OUT

C49

104P

C34

10U

C38

10U

411

U4E

TL074CD

-15V

+15V C68

104P

C69

104P

C37

10U

C39

10U

411

U5E

TL074CD

-15V

+15V

1 2

3 4

5 6

7 8

910

11 12

13 14

15 16

CN1 HEADER8X2

1 2

3 4

5 6

7 8

910

11 12

13 14

15 16

CN2 HEADER8X2

CN1-1 CN1-2

CN1-3 CN1-4

CN1-6

CN1-8

CN1-10

CN1-12

CN1-14

CN1-16

CN1-5

CN1-7

CN1-9

CN1-11

CN1-13

CN1-15

CN2-1

CN2-3

CN2-5

CN2-7

CN2-9

CN2-11

CN2-13

CN2-15

CN2-2

CN2-4

CN2-6

CN2-8

CN2-10

CN2-12

CN2-14

CN2-16

CN1-1

CN1-3

CN1-4

CN1-5

CN1-7

CN1-9

CN1-11

CN1-13

CN1-15

CN1-2

CN1-6

CN1-8

CN1-10

CN1-12

CN1-14

CN1-16

+48V+15V

CN2-1

CN2-3

CN2-5

CN2-7

CN2-9

CN2-11

CN2-13 CN2-15

CN2-2

CN2-4

CN2-6

CN2-8

CN2-10

CN2-12

CN2-14

CN2-16

+48V-15V

FrontPanel

AMtubeFP.sch

CN1-10

CN2-10

+12V

C78

47U

C79

47U

AMTUBEMN.Sch

Titel

Size

File:

Date: Drawn By:

Sheet

RevisionModel No:

7-Mar-2002 C.C.LIN

ALTO Mobile : ALPHAMICtube MAIN BOARD

11of

ALPHAMICtube VER020225

1 2 3 4

321

R25

20K0

R79

20K0

C40

47P

R67

20K0

R77

20K0 R80

10K0

C41

47P

R40

100R

R41

100R

LJB0661

R87

100K

R90

100K

C44

47/50VNP

C45

47/50VNP

R86

100K

R68

6K81

C46

47/50VNP

BAL-MALE

13 14

U4D

TL074CD

U4A

TL074CD

U4C

TL074CD

R37

100R

R45

51R1

-15V

+15V

C34

104P

C37

104P

C26

10U

C27

10U

411

U4E

TL074CD

C38

104P

C39

104P

C28

10U

C29

10U -15V

411

U5E

TL074CD

+48V

R26

20K0 R81

20K0

C42

47P

R69

20K0

R78

20K0 R82

10K0

C43

47P

R43

100R

R44

100R

LJB0661

R89

100K

R91

100K

C47

47/50VNP

C48

47/50VNP

R88

100K

R70

6K81

C49

47/50VNP

BAL-MALE

13 14

U5D

TL074CD

U5A

TL074CD

U5C

TL074CD

R42

100R

R46

51R1

CN4

7P-2.0 +15V

-15V

CH1-OUT

CH2-OUT

100/63V

1N4004

R83

10K

R92

150R

C68

M104P

100/63V

U13

LM7815CT

U14

LM7915CT

1N4004

C66

47/25VZ

C70

M104P

C64

2200/25V

C67

47/25VZ

C65

1000/25V

C69

M104P

+15V

100/63V C17

100/63V

-15V

ZD9

1N5261B

TR7

TIP122

(47V)

+48V

ACIN

(AC 18V)

CH1-OUTPUT CH2-OUTPUT

C73

100/63V

U15

LM7812CT

C74

47/25VZ C75

M104P

+12V

C76

47/50VNP C77

47/50VNP

AMTUBEPU.Sch

Titel

Size

File:

Date: Drawn By:

Sheet

RevisionModel No:

7-Mar-2002 C.C.LIN

ALTO Mobile : ALPHAMICtube REAR BOARD

11of

ALPHAMICtube VER020225

AMTUBEFP Top Layer AMTUBEFP Top Solder Mask

AMTUBEFP Bottom Layer

AMTUBEFP Bottom Solder Mask

AMTUBEFP Top Scilkscreen

AMTUBEFP Drill Drawing

---------------------------------------------------------------------------

NCDrill File Report For: AMTUBEFP.PCB 9-May-2002 16:26:29

---------------------------------------------------------------------------

Layer Pair : TopLayer to BottomLayer

ASCII File : NCDrillOutput.TXT

EIA File : NCDrillOutput.DRL

Tool Hole Size Hole Count Plated Tool Travel

---------------------------------------------------------------------------

T1 24mil (0.6096mm) 72 29.54 Inch (750.27 mm)

T2 31mil (0.7874mm) 140 30.14 Inch (765.64 mm)

T3 39mil (0.9906mm) 28 14.01 Inch (355.84 mm)

T4 79mil (2.0066mm) 4 9.78 Inch (248.33 mm)

T5 83mil (2.1082mm) 9 6.04 Inch (153.35 mm)

T6 87mil (2.2098mm) 4 10.82 Inch (274.86 mm)

---------------------------------------------------------------------------

Totals 257 100.33 Inch (2548.29 mm)

Total Processing Time : 00:00:00

AMTUBEMN Top Layer

AMTUBEMN Top Solder Mask

AMTUBEMN Bottom Layer

AMTUBEMN Bottom Solder Mask

Table of contents

Popular Amplifier manuals by other brands

ASTRO

ASTRO HVO V40 P operating manual

Marantz

Marantz SUPERSCOPE BLA-545 Service data

NAD

NAD CI980 Quick setup guide

Technics

Technics SE-CH770 Service manual

Harman Kardon

Harman Kardon HK6300 instruction manual

NAD

NAD T975 owner's manual

McIntosh

McIntosh MA6850 Brochure & specs

Electro-Harmonix

Electro-Harmonix ENGLISH MUFF’N manual

Viatron

Viatron Autrix Technical manual

GME

GME GA9800 instruction manual

Atlas

Atlas CP700 Specification sheet

Roland

Roland KC-1000 owner's manual

Pyle

Pyle PFMRA350BW user manual

Advantage

Advantage S-250 manual

IRT Electronics

IRT Electronics DVA-3007 manual

Dimavery

Dimavery BA-100 Series user manual

Sony

Sony XM-S400D operating instructions

Schertler

Schertler ROY X quick guide

Alto aMictube User manual

Popular Amplifier manuals by other brands