AMS 1081 User Manual

© 2000 AMS Neve plc own the copyright of all
information and drawings contained in this manual which
are not to be copied or reproduced by any means or
disclosed in part or whole to any third party without
written permission.

As part of our policy of continual product improvement,
we reserve the right to alter specifications without notice
but with due regard to all current legislation.

Disclaimer: The information in this manual has been
carefully checked and is believed to be accurate at the
time of publication. However, no responsibilty is taken by
us for inaccuracies, errors or omissions nor any liability
assumed for any loss or damage resulting either directly or
indirectly from use of the information contained within it.

AMS NEVEINC., NEW YORK

TEL: [phone]  FAX: [phone]

AMS NEVE INC., HOLLYWOOD

TEL: [phone]  FAX: [phone]

RUPERT NEVE CANADA INC., TORONTO

TEL: [phone]  FAX: [phone]

AMS NEVE PLC  BILLINGTON ROAD  BURNLEY

LANCS BB11 5UB  ENGLAND

TELEPHONE: [phone]  FAX: [phone]

HEAD OFFICE

TELEPHONE: [phone]  FAX: [phone]

LONDON OFFICE

NORTH AMERICAN OFFICES

e-mail: [e-mail]

http://www.ams-neve.com

User Guide

527-230

Issue 3

1081 Channel Amplifier

Including 3U and 7U Rack Options

Contents

Introduction 1

Installation 1

Dimensions 2

Power Requirements 3

Phantom Power 4

Output Level Control 4

Amplifier Controls 5

EMI Filter Components 6

Rear Panel Views 7

Connector Details 8

Connector Details Continued 9

Specifications 10

Service Information 11

1081 Recall Sheet - Horizontal Module 12

1081 Recall Sheet - Vertical Module 13

User Guide Issue 3 Page i

1081 Channel Amplifier

Introduction

The 1081 channel amplifier was first produced in 1972 to provide the mic/line-amp and EQ
sections in Neve consoles such as the 8048. A look through the credits on today’s top selling CDs
will reveal that these vintage consoles are still widely used to great effect and that the 1081 module
has become ahugely popular design classic. Thisis why AMS Neve have resumedproduction of the
1081, using the original components and construction methods.

Installation

The 1081 is available as a stand-alone module, or in a choice of two housings that provide power
supply, phantom power switching for each module and connectors for balanced inputs (mic and
line) and outputs:

The 3U rack housestwo modulesmounted horizontallyin a 19” rack-mounting unit. Therear panel
has XLRs for transformer balanced I/O and a 25-way ‘D’-type connector for solo and spare switch
contacts and unbalanced outputs plus an IEC connector for mains power.

The 7U rack houses 8 modules vertically in a 19” rack-mounting unit. The rear panel has XLRs for
transformer balanced I/O and a 25-way ‘D’-type connector for solo and spare switch contacts and
unbalanced outputs plus an IEC connector for mains power.

User Guide Issue 3 Page 1

1081 Channel Amplifier Introduction

PHANTOM

CH1

CH2

+48V

+24V

MAINS

1

2

OUTPUT

NEVE

AMS

56

·

150

47

82

18

27

OFF

8·2

KHz

12

270

Hz

56

303

39

·

10

0

0

81

33

OFF

Hz

680

1000

820

270

330

1200

OFF

220

3·9

5

·6

4

·7

8

·2

6

·8

1

·8

3

·3

2

·7

2

·2

3

·3

KHz

1·5

4

·7

OFF

MIC

15

10

68

·

20

30

OFF

LINE

10

40

50

60

+10

10

0

80

dB

70

20

Hi
Q

Hi
Q

EQ

SOLO

PH

470

390

560

56

·

150

47

82

18

27

OFF

8·2

KHz

12

270

Hz

56

303

39

·

10

0

0

81

33

OFF

Hz

680

1000

820

270

330

1200

OFF

220

3·9

5

·6

4

·7

8

·2

6

·8

1

·8

3

·3

2

·7

2

·2

3

·3

KHz

1·5

4

·7

OFF

MIC

15

10

68

·

20

30

OFF

LINE

10

40

50

60

+10

10

0

80

dB

70

20

Hi
Q

Hi
Q

EQ

SOLO

PH

470

390

560

CH8

CH7

CH2

CH1

CH4

CH3

CH6

CH5

NEVE

AMS

+48V

+24V

MAINS

1

2

3

4

5

6

7

8

PHANTOM OUTPUT

56

·

56

·

56

·

56

·

56

·

56

·

56

·

56

·

150 150 150 150 150 150 150 150

47 47 47 47 47 47 47 47

Hz Hz Hz Hz Hz Hz Hz Hz

82 82 82 82 82 82 82 82

18 18 18 18 18 18 18 18

27 27 27 27 27 27 27 27

OFF OFF OFF OFF OFF OFF OFF OFF

8·28·28·28·28·28·28·28·2

KHz KHz KHz KHz KHz KHz KHz KHz

12 12 12 12 12 12 12 12

270 270 270 270 270 270 270 270

Hz Hz Hz Hz Hz Hz Hz HzHz Hz Hz Hz Hz Hz Hz Hz

56 56 56 56 56 56 56 56

333333330000000033333333

39

·

39

·

39

·

39

·

39

·

39

·

39

·

39

·

111111110000000000000000

00000000

8888888811111111

33 33 33 33 33 33 33 33

OFF OFF OFF OFF OFF OFF OFF OFF

55555555

88888888

2222222200000000

Hz Hz Hz Hz Hz Hz Hz Hz

66666666

8888888800000000

11111111000000000000000000000000

1111111122222222

777777770000000022222222

6666666600000000

44444444

7777777700000000

33333333

9999999900000000

333333333333333300000000

0000000000000000

OFF OFF OFF OFF OFF OFF OFF OFF

000000002222222222222222

3·9 3·9 3·9 3·9 3·9 3·9 3·9 3·9

5

·6

5

·6

5

·6

5

·6

5

·6

5

·6

5

·6

5

·6

4

·7

4

·7

4

·7

4

·7

4

·7

4

·7

4

·7

4

·7

8

·2

8

·2

8

·2

8

·2

8

·2

8

·2

8

·2

8

·2

6

·8

6

·8

6

·8

6

·8

6

·8

6

·8

6

·8

6

·8

1

·8

1

·8

1

·8

1

·8

1

·8

1

·8

1

·8

1

·8

3

·3

3

·3

3

·3

3

·3

3

·3

3

·3

3

·3

3

·3

KHzKHzKHzKHzKHzKHzKHzKHz

2

·7

2

·7

2

·7

2

·7

2

·7

2

·7

2

·7

2

·7

2

·2

2

·2

2

·2

2

·2

2

·2

2

·2

2

·2

2

·2

3

·3

3

·3

3

·3

3

·3

3

·3

3

·3

3

·3

3

·3

KHz KHz KHz KHz KHz KHz KHz KHz

1·51·51·51·51·51·51·51·5

4

·7

4

·7

4

·7

4

·7

4

·7

4

·7

4

·7

4

·7

OFF OFF OFF OFF OFF OFF OFF OFF

MIC MIC MIC MIC MIC MIC MIC MIC

15 15 15 15 15 15 15 15

10 10 10 10 10 10 10 10

68

·

68

·

68

·

68

·

68

·

68

·

68

·

68

·

20 20 20 20 20 20 20 20

30 30 30 30 30 30 30 30

OFF OFF OFF OFF OFF OFF OFF OFF

LINE LINE LINE LINE LINE LINE LINE LINE

10 10 10 10 10 10 10 10

40 40 40 40 40 40 40 40

50 50 50 50 50 50 50 50

60 60 60 60 60 60 60 60

+10+10+10+10+10+10+10+10

10 10 10 10 10 10 10 10

00000000

80 80 80 80 80 80 80 80

dB dB dB dB dB dB dB dB

70 70 70 70 70 70 70 70

20 20 20 20 20 20 20 20

HiQHiQHiQHiQHiQHiQHiQHiQ

HiQ HiQ HiQ HiQ HiQ HiQ HiQ HiQ

EQ EQ EQ EQ EQ EQ EQ EQ

SOLO SOLO SOLO SOLO SOLO SOLO SOLO SOLO

PH PH PH PH PH PH PH PH

Dimensions

Stand-alone Module

Dimensions: Front panel 45mm x 305 mm (1.8 inches x 12 inches).

Approx 300mm (12 inches) deep behind the front panel.

Approx. Weight: 3kg (6.6 lbs)

Rack Data

19" Rack Mounting U Depth

mm (inches)

Height

mm (inches)

Approx. Weight

kg (lbs)

2 Module Version 3 400 134 (5¼) 17 (37) *

8 Module Version 7 400 311 (12¼) 46 (101) *

* Fully populated rack

The 7U unit is heavy (over 20kg) and should be handled by two persons.

User Guide Issue 3 Page 2

1081 Channel Amplifier Dimensions

Power Requirements

3U 7U

Rated Voltage 100-230V AC 100-230V AC

Rated Frequency 50-60 Hz 50-60Hz

Rated Current 0.5A Max 0.8A Max

Surge Current (In Rush) Cold
Surge Current (In Rush) Hot

31.0A

33.0A

31.0A

33.0A

Earth Leakage Current Approx 1.2mA Approx 1.3mA

Warning for High Earth Leakage
Current Required

NO NO

Primary Protection Fuse:

Operating Voltage 100-230V AC 100-230V AC

Fuse Rating and Type T1.6A H 250V

20mm x 5mm CERAMIC

T1.6A H 250V
20mm x 5mm CERAMIC

Location IEC Mains connector IEC Mains connector

Secondary Protection Fuse:

Output Voltage 24V DC 24V DC

Fuse Rating and Type T 1.0A L 250V

20mm x 5mm GLASS

T 2.0A L 250V
20mm x 5mm GLASS

Location F1 on SZN825-058 F1 on SZN825A058

Output Voltage 48V DC 48V DC

Fuse Rating and Type T 500mA L 250V

20mm x 5mm GLASS

T 500mA L 250V

20mm x 5mm GLASS

Location F2 on SZN825-058 F2 on SZN825A058

Stand-alone 1081 Module

Power 192mA at 24V DC. Negative Earth

Mains Supply (rack units)

The power supply unit is a universal input type therefore no mains operating voltage setting is
required.

The mains switch on the front panel of the 3U and 7U rack units is non-illuminating.

The CH (chassis) and 0V Link should be connected or instability may result.

User Guide Issue 3 Page 3

1081 Channel Amplifier Power Requirements

Mains Fuse (rack units)

The mains fuseis located in the IEC mainsinput connector on the rear ofthe 3U and 7U rack units.

Secondary Protection Fuses (rack units)

Secondary protection fuses for the 24V and 48V supplies are located behind the front panel on the
power supply filter PCB SZN825-058 in both 3U and 7U rack units.

DC Power Supply Indicators (rack units)

The red LED on the front panel of both 3U and 7U rack units indicates +24V power healthy when
illuminated.
The green LED on the front panel of both 3U and 7U rack units indicates +48V power healthy when
illuminated.

Phantom Power

Phantom power can be supplied toeach moduleby pressingthe phantompower switchon thefront
panel of the 3U or 7U rack. The LED in the switch will illuminate confirming that phantom power is
supplied.

Output Level Control

Each channel has an independent Output Level Control. The control is post-input, post-EQ and
pre-output. This control allows the input and EQ to operate at a higher level and then for the signal
to be returned to a normal operating level at the output.

When the Output Control is fully clockwise the output gain is unity. The output is 10dB down with
the control in the mid-position.

User Guide Issue 3 Page 4

1081 Channel Amplifier Phantom Power

Amplifier Controls

H.F. Controls: 5 switched frequencies, shelving or peaking curve, continuously

variable 18dB cut or boost.

H.F. Presence: 10 switched frequencies with continuously variable 18dB cut or

boost, high or low Q selection.

L.F. Presence: 10 switched frequencies with continuously variable 18dB cut or

boost, high or low Q selection.

L.F. Controls: 5 switched frequencies, shelving or peaking curve, continuously

variable 18dB cut or boost.

H.P. Filter: 5 switched frequencies with slope of 18dB per octave.

L.P. Filter: 5 switched frequencies with slope of 18dB per octave.

PH Button: Gives 180° phase change at the balanced output.

EQ Button: Selects equalisation in or out of circuit.

SOLO Button: Selects channel unbalanced output and closing switch contact.

Spare Button: Switches external device as required.

User Guide Issue 3 Page 5

1081 Channel Amplifier Amplifier Controls

56

·

150

47

82

18

27

OFF

8·2

KHz

12

270

Hz

56

303

39

·

10

0

0

81

33

OFF

Hz

680

1000

820

270

330

1200

OFF

220

3·9

5

·6

4

·7

8

·2

6

·8

1

·8

3

·3

2

·7

2

·2

3

·3

KHz

1·5

4

·7

OFF

MIC

15

10

68

·

20

30

OFF

LINE

10

40

50

60

+10

10

0

80

dB

70

20

Hi
Q

Hi
Q

EQ

SOLO

PH

470

390

560

56·150

47

Hz

82

18

27

OFF

8·2

KHz

12

270

HzHz

56

303

39·

100

0

81

33

OFF

5

8

20

Hz

680

1000

12

702

60

470

390

330

00

OFF

022

3·9

5·6

4·7

8·2

6·8

1·8

3·3

KHz

2·7

2·2

3·3

KHz

1·5

4·7

OFF

MIC

15

10

68

·

20

30

OFF

LINE

10

40

50

60

+10

10

0

80

dB

70

20

HiQ

HiQ

EQ

SOLO

PH

EMI Filter Components

Jumpers may be fitted on the SUN870-081 I/O boards to allow the EMI filtering (three terminal
capacitors and common mode inductors) to be ‘removed’ from the signal path. This may be
desirable for those seeking sonic purity. However it must be noted that the immunity of the product
to external RFfields could suffer, and if thisis the case then the jumperlinks should be removed.

The individual 1081 modules are offered for inclusion in the customers own housings. As such no
claim is being made regarding the immunity of these units. This will be principally governed by the
type of cabling, connectors and enclosure used. The use of screened cables and connectors is
recommended for all connections. Tests have shown that no problems with emissions as defined in
EMC standards should be present with these units.

User Guide Issue 3 Page 6

1081 Channel Amplifier EMI Filter Components

Rear Panel Views

User Guide Issue 3 Page 7

1081 Channel Amplifier Rear Panel Views

ACM AINSI/P

CH 0V

AUXILARY

MIC 1 LINE 1 O/P 1

MIC 2 LINE 2 O/P 2

CH 0V

AC MAINS I/P

O/P 8

LINE 8

O/P 6O/P 7 O/P 5

LINE 6LINE 7 LINE 5

O/P 3O/P 4 O/P 2

LINE 3LINE 4 LINE 2

O/P 1

LINE 1

AUXILARY 7-8 AUXILARY 5-6 AUXILARY 3-4 AUXILARY1-2

MIC 8 MIC 7 MIC 6 MIC 5 MIC 4 MIC 3 MIC 2 MIC 1

Connector Details

User Guide Issue 3 Page 8

1081 Channel Amplifier Connector Details

1081 Stand-alone

Wiring to 18 way Free Plug

A

B

C

D

E

F

H

J

K

L

M

N

P

R

S

T

U

V

0V

0V

Hi

Lo

Spare Switch Contact

0V

Hi

Lo

Link

Solo Switch Contact

Unbalanced O/P

Hi

Lo

BAL O/P

Solo O/P (unbalanced)

+24V at 192mA

Solo

Spare

Mic I/P

Line I/P

0dBu

-10dBu

0dBu

0dBu

-10dBu

Technical

Earth Link

Connector Details Continued

User Guide Issue 3 Page 9

1081 Channel Amplifier Connector Details Continued

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

-10dBu

NC

NC

NC

NC

Chassis Earth

Chassis Earth

Chassis Earth

Unbalanced 0V

Solo 1

Spare 1

Spare 2

Solo 2

Unbalanced O/P

CH 1

Chassis Earth

Solo O/P (unbalanced)

CH 1

Solo Switch Contacts CH1

Spare Switch Contacts CH1

-10dBu

-10dBu

Unbalanced 0V

Unbalanced O/P

Chassis Earth

Solo O/P (unbalanced)

Solo Switch Contacts

Spare Switch Contacts

-10dBu

CH

2

CH

2

CH

2

CH

2

Rear of 1081 2 Module (3U) and 8 Module (7U) Racks

25 way D Auxiliary and XLR Wiring

25 way D-Type

Wiring View

12

3

12

3

XLR

Wiring View

Hi

Lo

Mic/Line I/P (Balanced)

Plug

O/P (Balanced)

Socket

Hi

Lo

For the 8 Module Rack :

CH1 is CH1, CH 3, CH 5 or CH

7

CH2isCH2,CH4,CH6orCH

8

Specifications

Microphone Input: Zin 300 or 1200 ohms switched,

gain +80 to +10 dB in 5dB steps.

Line Input: Zin 10k ohms bridging, gain +20 to -15dB in 5dB steps.

Both inputs are balanced and earth-free.

Outputs: Max +26dB into 600 ohms. Zout 75 ohms ±5% @ 1kHz,

balanced and earth-free. An unbalanced output 8dB below
the level of the balanced output is also provided.

Distortion: Not more than 0.07% for +20dBm output from 50Hz to 15kHz.

Frequency Response: ±0.5dB from 20Hz to 20kHz. -3dB at 7Hz and 35kHz.

Noise: Output noise better than -42dBm from Zin 1200 ohms and

-80dB input, giving an equivalent noise of -125dBm referred to
600 ohms input impedance fed from 100 ohms. Output noise
better than - 80dBm at all line input levels.

User Guide Issue 3 Page 10

1081 Channel Amplifier Specifications

Service Information

Schematic Drawing index

PL31081- Channel Amplifier Horizontal and Vertical module versions:

PL31081-C Channel Amplifier

PL10306-C Dual Voltage Follower

PL10312-C Channel Amplifier Motherboard

PL10338-C High Gain Amplifier

PL10340-C Output Amplifier

PL20046 Sensitivity Switch

PL20047 Treble Switch Assembly

PL20048/4 Upper Presence Switch Assembly

PL20048/5 Lower Presence Switch Assembly

PL20049 LP/HP Filter Switch Assembly

PL20050 Bass Switch Assembly

AM3631 - 3U Rack:

AM3631 2 CH 1081 Mainframe Assembly Detail

SZN825-058 PSU Filter PCB

SSN818-036 0V Stud Filter PCB

SUN870-081 2CH I/P O/P Backplane

SYN824-128 2 Switch Phantom Power PCB

NN3726 Chassis Cable Assy

AM3630 - 7U Rack:

AM3630 8 CH 1081 Mainframe Assembly Detail

SZN825A058 PSU Filter PCB

Same as the 3U Rack

User Guide Issue 3 Page 11

1081 Channel Amplifier Service Information

1081 Recall Sheet - Horizontal Module

User Guide Issue 3 Page 12

1081 Channel Amplifier 1081 Recall Sheet - Horizontal Module

1081 Recall Sheet - Vertical Module

User Guide Issue 3 Page 13

1081 Channel Amplifier 1081 Recall Sheet - Vertical Module

Title: 2 Channel 1081 Chassis Wiring Schedule Nr: AM3631

13 December, 2001 Page:

3

Issue: 3

CABLE FROM:- ROUTING TO:-

Code Type Colour Pin Connector Location Signal Length Comment Pin Connector Location

310-166 32/0.2 Green/Yellow E 330-119 IEC Stud 330-454 Chassis Safety
310-183 24/0.2 Green/Yellow E 330-069 PSU1 Stud 330-454 Chassis
310-183 24/0.2 Green/Yellow E 330-069 PSU2 Stud 330-454 Chassis
310-132 24/0.2 Brown L 330-119 IEC 13 Switch

Blue N 330-119 IEC 23 Switch

310-132 24/0.2 Brown L 330-471(1of2) PSU1 14 Switch

Blue N 330-471(1of2) PSU1 24 Switch

310-132 24/0.2 Brown L 330-471(2of2) PSU1 L 330-069 PSU2

Blue N 330-471(2of2) PSU1 N 330-069 PSU2
310-166 32/0.2 Green/Yellow Ch 330-069 SSN818A036 Stud 330-454 Chassis
310-074 24/0.2 Red +24V 330-069(1of2) PSU1 Twist 1 420-712 CN1
310-072 24/0.2 Black -0V 330-069(1of2) PSU1 together 2 SZN825-058
310-048 16/0.2 Red +24V 330-069(2of2) PSU1 Twist X2 Switch
310-046 16/0.2 Black -0V 330-069(2of2) PSU1 together X1 Switch
310-075 24/0.2 Orange + 330-069 PSU2 Twist 3 CN1
310-072 24/0.2 Black - 330-069 PSU2 together 4 SZN825-058
310-074 24/0.2 Red 1 420-712 CN2 Twist +24V WA17103 1081CN PNL
310-072 24/0.2 Black 2 SZN825-058 together 0VA WA17103
310-072 24/0.2 Black J1 SSN818A036 0VA WA17103
310-048 16/0.2 Red +24V WA17103 1081CN PNL U 1081 CN1

U 1081 CN2

310-046 16/0.2 Black 0VA WA17103 1081CN PNL E 1081 CN1

E 1081 CN2
310-033 7/0.2 Green E1 SUN870-081 2cm Chassis 330-006
310-033 7/0.2 Green E2 Channel 1&2 2cm Chassis 330-006

Title: 8 Channel 1081 Chassis Wiring Schedule Nr: AM3630

13 December, 2001 Page:

3

Issue: 4

CABLE FROM:- ROUTING TO:-

Code Type Colour Pin Connector Location Signal Length Comment Pin Connector Location

310-166 32/0.2 Green/Yellow E 330-119 IEC 25cms Stud 330-454 Chassis Safety
310-183 24/0.2 Green/Yellow E 330-069 PSU1 40cms Stud 330-454 Chassis
310-183 24/0.2 Green/Yellow E 330-069 PSU2 40cms Stud 330-454 Chassis
310-132 24/0.2 Brown L 330-119 IEC 58cms 13 Switch

Blue N 330-119 IEC 58cms 23 Switch

310-132 24/0.2 Brown L 330-471(1of2) PSU1 80cms 14 Switch

Blue N 330-471(1of2) PSU1 80cms 24 Switch

310-132 24/0.2 Brown L 330-471(2of2) PSU1 15cms L 330-069 PSU2

Blue N 330-471(2of2) PSU1 15cms N 330-069 PSU2
310-166 32/0.2 Green/Yellow Ch 330-069 SSN818A036 23cms Stud 330-454 Chassis
310-074 24/0.2 Red +24V 330-069(1of2) PSU1 90cms Twist 1 420-712 CN1
310-072 24/0.2 Black - 0V 330-069(1of2) PSU1 90cms together 2 SZN825-058
310-048 16/0.2 Red +24V 330-069(2of2) PSU1 90cms Twist X2 Switch
310-046 16/0.2 Black -0V 330-069(2of2) PSU1 90cms together X1 Switch
310-075 24/0.2 Orange +48V 330-069 PSU2 1mtr Twist 3 CN1
310-072 24/0.2 Black - 0V 330-069 PSU2 1mtr together 4 SZN825-058
310-074 24/0.2 Red 1 420-712 CN2 80cms Twist +24V WA17103 1081CN PNL
310-072 24/0.2 Black 2 SZN825-058 82cms together 0VA WA17103
310-072 24/0.2 Black J1 SSN818A036 58cms 0VA WA17103
310-048 16/0.2 Red +24V WA17103 1081CN PNL 8cms U 1081 CN1-4

8cms U 1081 CN5-8

310-046 16/0.2 Black 0VA WA17103 1081CN PNL 8cms E 1081 CN1-4

8cms E 1081 CN5-8
310-033 7/0.2 Green E1 SUN870-081 2cm Chassis 330-006
310-033 7/0.2 Green E2 Channel 1&2 2cm Chassis 330-006
310-033 7/0.2 Green E1 SUN870-081 2cm Chassis 330-006

Title: 8 Channel 1081 Chassis Wiring Schedule Nr: AM3630

13 December, 2001 Page:

4

Issue: 2

CABLE FROM:- ROUTING TO:-

Code Type Colour Pin Connector Location Signal Length Comment Pin Connector Location

310-033 7/0.2 Green E2 Channel 3&4 2cm Chassis 330-006
310-033 7/0.2 Green E1 SUN870-081 2cm Chassis 330-006

310-033 7/0.2 Green E2 Channel 5&6 2cm Chassis 330-006
310-033 7/0.2 Green E1 SUN870-081 2cm Chassis 330-006
310-033 7/0.2 Green E2 Channel 7&8 2cm Chassis 330-006