1081 Channel Amplifier
Including 3U and 7U Rack Options
User Guide 527-230 Issue 3
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.

OFFICE

AMS NEVE PLC BILLINGTON ROAD BURNLEY LANCS BB11 5UB ENGLAND
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LO N D O N

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AMS NEVE INC., NEW YORK

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Contents

Introduction Installation Dimensions Power Requirements Phantom Power Output Level Control Amplifier Controls EMI Filter Components Rear Panel Views Connector Details Connector Details Continued Specifications Service Information 1081 Recall Sheet - Horizontal Module 1081 Recall Sheet - Vertical Module 13

User Guide Issue 3

Page i

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 todays top selling CDs will reveal that these vintage consoles are still widely used to great effect and that the 1081 module has become a hugely popular design classic. This is why AMS Neve have resumed production 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:

dB 70 60

0 +10 15

KHz 22 18

27 Hz OFF

330 270

PHANTOM

MIC 30

220 OFF

+48V CH1

AMS NEVE

OUTPUT

SOLO PH EQ

MIC 10

The 3U rack houses two modules mounted horizontally 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.

PHANTOM OUTPUT

40 LINE MIC

47 OFF

KHz 33

680 Hz

OFF 0 330

OFF Hz Hz 56

12 KHz

PH EQ SOLO

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.

Page 1

Dimensions

Stand-alone Module

Dimensions: Approx. Weight: Front panel 45mm x 305 mm (1.8 inches x 12 inches). Approx 300mm (12 inches) deep behind the front panel. 3kg (6.6 lbs)

Rack Data

19" Rack Mounting 2 Module Version 8 Module Version U Depth mm (inches) Height mm (inches) 134 (5) 311 (12) Approx. Weight kg (lbs) 17 (37) * 46 (101) *

* Fully populated rack

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

Page 2

Power Requirements
3U Rated Voltage Rated Frequency Rated Current Surge Current (In Rush) Cold Surge Current (In Rush) Hot Earth Leakage Current Warning for High Earth Leakage Current Required Primary Protection Fuse: Operating Voltage Fuse Rating and Type Location Secondary Protection Fuse: Output Voltage Fuse Rating and Type Location Output Voltage Fuse Rating and Type Location 24V DC T 1.0A L 250V 20mm x 5mm GLASS F1 on SZN825-058 48V DC T 500mA L 250V 20mm x 5mm GLASS F2 on SZN825-058 24V DC 100-230V AC T1.6A H 250V 20mm x 5mm CERAMIC IEC Mains connector 100-230V AC 50-60 Hz 0.5A Max 31.0A 33.0A Approx 1.2mA NO 50-60Hz 0.8A Max 31.0A 33.0A

7U 100-230V AC

Approx 1.3mA NO
100-230V AC T1.6A H 250V 20mm x 5mm CERAMIC IEC Mains connector
T 2.0A L 250V 20mm x 5mm GLASS F1 on SZN825A058 48V DC T 500mA L 250V 20mm x 5mm GLASS 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.

Page 3

Phantom Power

Mains Fuse (rack units)

The mains fuse is located in the IEC mains input connector on the rear of the 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 can be supplied to each module by pressing the phantom power switch on the front 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.

Page 4

Amplifier Controls

H.F. Controls:

5 switched frequencies, shelving or peaking curve, continuously variable 18dB cut or boost. 10 switched frequencies with continuously variable 18dB cut or boost, high or low Q selection. 10 switched frequencies with continuously variable 18dB cut or boost, high or low Q selection. 5 switched frequencies, shelving or peaking curve, continuously variable 18dB cut or boost. 5 switched frequencies with slope of 18dB per octave. 5 switched frequencies with slope of 18dB per octave. Gives 180 phase change at the balanced output. Selects equalisation in or out of circuit. Selects channel unbalanced output and closing switch contact. Switches external device as required.
H.F. Presence: L.F. Presence: L.F. Controls: H.P. Filter: L.P. Filter: PH Button: EQ Button: SOLO Button: Spare Button:

KHz 47 OFF

OFF 330

Page 5

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 RF fields could suffer, and if this is the case then the jumper links 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.

Page 6

Rear Panel Views

AC M AINS I/P

LINE 1

LINE 2

AUXILARY

LINE 8

LINE 7

LINE 6

LINE 5

LINE 4

LINE 3

AC MAINS I/P

AUXILARY 7-8

AUXILARY 5-6

AUXILARY 3-4

AUXILARY 1-2

Page 7

Connector Details

1081 Stand-alone Wiring to 18 way Free Plug
Spare Spare Switch Contact

Hi Mic I/P Lo 0dBu

D E F H J K L M
Link 0V Hi Lo Line I/P 0dBu
Solo Switch Contact 0V Unbalanced O/P Hi Lo 0V Solo O/P (unbalanced) +24V at 192mA -10dBu BAL O/P -10dBu

N P R S T U V

Technical Earth Link

Page 8

Connector Details Continued
Rear of Module (3U) and 8 Module (7U) Racks 25 way D Auxiliary and XLR Wiring 25 way D-Type Wiring View
5 Solo Spare 1 Chassis Earth Spare 2 Solo 23 Unbalanced 0V Chassis Earth 25 NC NC Solo O/P (unbalanced) Chassis Earth Unbalanced O/P -10dBu CH 2 -10dBu CH 2 Solo Switch Contacts CH 2 Spare Switch Contacts CH Spare Switch Contacts CHSolo Switch Contacts CH1

14 NC 15 Unbalanced O/P Chassis Earth Solo O/P (unbalanced) -10dBu CH 1 -10dBu CH 1
Chassis Earth Unbalanced 0V
For the 8 Module Rack : CH1 is CH1, CH 3, CH 5 or CH 7 CH2 is CH 2, CH 4, CH 6 or CH 8

XLR Wiring View

Mic/Line I/P (Balanced) Plug

Hi Lo 1

O/P (Balanced) Socket

2 Hi Lo

Page 9

Specifications

Microphone Input: Line Input: Outputs: Zin 300 or 1200 ohms switched, gain +80 to +10 dB in 5dB steps. Zin 10k ohms bridging, gain +20 to -15dB in 5dB steps. Both inputs are balanced and earth-free. 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. Not more than 0.07% for +20dBm output from 50Hz to 15kHz. 0.5dB from 20Hz to 20kHz. -3dB at 7Hz and 35kHz. 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.
Distortion: Frequency Response: Noise:

Page 10

Service Information

Schematic Drawing index

PL31081- Channel Amplifier Horizontal and Vertical module versions:
PL31081-C PL10306-C PL10312-C PL10338-C PL10340-C PL20046 PL20047 PL20048/4 PL20048/5 PL20049 PL20050
Channel Amplifier Dual Voltage Follower Channel Amplifier Motherboard High Gain Amplifier Output Amplifier Sensitivity Switch Treble Switch Assembly Upper Presence Switch Assembly Lower Presence Switch Assembly LP/HP Filter Switch Assembly Bass Switch Assembly

AM3631 - 3U Rack:

AM3631 SZN825-058 SSN818-036 SUN870-081 SYN824-128 NN3726
2 CH 1081 Mainframe Assembly Detail PSU Filter PCB 0V Stud Filter PCB 2CH I/P O/P Backplane 2 Switch Phantom Power PCB Chassis Cable Assy

AM3630 - 7U Rack:

AM3630 SZN825A058
8 CH 1081 Mainframe Assembly Detail PSU Filter PCB

Same as the 3U Rack

Page 11
1081 Recall Sheet - Horizontal Module

Page 12

1081 Recall Sheet - Vertical Module

Page 13

Title: 2 Channel 1081 Chassis Wiring

CABLE Code

310-166 310-183 310-183 310-132 310-132 310-132 310-166 310-074 310-072 310-048 310-046 310-075 310-072 310-074 310-072 310-072 310-048 310-046 310-033 310-033
Schedule Nr: AM3631 Issue: 3

TO:Comment Pin

Stud Stud Stud L N Stud X2 X4

FROM:Colour

Green/Yellow Green/Yellow Green/Yellow Brown Blue Brown Blue Brown Blue Green/Yellow Red Black Red Black Orange Black Red Black Black Red Black Green Green E1 E2

ROUTING Connector

330-119 330-069 330-069 330-119 330-119 330-471(1of2) 330-471(1of2) 330-471(2of2) 330-471(2of2) 330-069 330-069(1of2) 330-069(1of2) 330-069(2of2) 330-069(2of2) 330-069 330-069 420-712
32/0.2 24/0.2 24/0.2 24/0.2 24/0.2 24/0.2 32/0.2 24/0.2 24/0.2 16/0.2 16/0.2 24/0.2 24/0.2 24/0.2 24/0.2 24/0.2 16/0.2 16/0.2 7/0.2 7/0.2
E E E L N L N L N Ch +24V -0V +24V -0V + J1

Location

IEC PSU1 PSU2 IEC IEC PSU1 PSU1 PSU1 PSU1 SSN818A036 PSU1 PSU1 PSU1 PSU1 PSU2 PSU2 CN2 SZN825-058 SSN818A036 1081CN PNL 1081CN PNL SUN870-081 Channel 1&2

Signal

Length

Connector

330-454 330-454 330-454
Chassis Safety Chassis Chassis Switch Switch Switch Switch PSU2 PSU2 Chassis CN1 SZN825-058 Switch Switch CN1 SZN825-058 1081CN PNL
Twist together Twist together Twist together Twist together
330-069 330-069 330-454 420-712

+24V WA17103 0VA WA17103

2cm 2cm

U U E E Chassis Chassis

+24V WA17103 0VA WA17103 0VA WACNCNCNCN2 330-006 330-006

13 December, 2001

Title: 8 Channel 1081 Chassis Wiring
310-166 310-183 310-183 310-132 310-132 310-132 310-166 310-074 310-072 310-048 310-046 310-075 310-072 310-074 310-072 310-072 310-048 310-046 310-033 310-033 310-033
Schedule Nr: AM3630 Issue: 4
Green/Yellow Green/Yellow Green/Yellow Brown Blue Brown Blue Brown Blue Green/Yellow Red Black Red Black Orange Black Red Black Black Red Black Green Green Green E1 E2 E1
32/0.2 24/0.2 24/0.2 24/0.2 24/0.2 24/0.2 32/0.2 24/0.2 24/0.2 16/0.2 16/0.2 24/0.2 24/0.2 24/0.2 24/0.2 24/0.2 16/0.2 16/0.2 7/0.2 7/0.2 7/0.2
E E E L N L N L N Ch +24V - 0V +24V -0V +48V - 0V J1
IEC PSU1 PSU2 IEC IEC PSU1 PSU1 PSU1 PSU1 SSN818A036 PSU1 PSU1 PSU1 PSU1 PSU2 PSU2 CN2 SZN825-058 SSN818A036 1081CN PNL 1081CN PNL SUN870-081 Channel 1&2 SUN870-081

25cms 40cms 40cms 58cms 58cms 80cms 80cms 15cms 15cms 23cms 90cms 90cms 90cms 90cms 1mtr 1mtr 80cms 82cms 58cms 8cms 8cms 8cms 8cms 2cm 2cm 2cm
U U E E Chassis Chassis Chassis
+24V WA17103 0VA WA17103 0VA WACN1-CN5-CN1-CN5-8 330-006 330-006 330-006

310-033 310-033

Schedule Nr: AM3630 Issue: 2

Chassis Chassis

Green Green
ROUTING Connector Location
Channel 3&4 SUN870-081

7/0.2 7/0.2

330-006 330-006

310-033 310-033 310-033

7/0.2 7/0.2 7/0.2

Green Green Green

E2 E1 E2
Channel 5&6 SUN870-081 Channel 7&8

2cm 2cm 2cm

Chassis Chassis Chassis

330-006 330-006 330-006