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1073 & 1084 Channel Amplifiers
Contents
Introduction 1
High Pass Filter (resistor modification) 1
Important Note 1
Installation 2
Dimensions 3
Power Requirements 3
Mains Supply (rack units) 4
DC Power Supply Indicators (rack units) 4
Phantom Power 4
Output Level Control 4
Connector Details 5
Amplifier Controls 6
1073 Module 6
1084 Module 7
Specifications 8
1073 and 1084 Modules 8
Recall Sheets 9
1073 - Vertical Module 9
1073 - Horizontal Module 10
1084 - Vertical Module 11
1084 - Horizontal Module 12
Service Information 13
Schematic Drawing Index - 1073/1084 Racks 13
Schematic Drawing Index - 1073 Module 13
Schematic Drawing Index - 1084 Module 14
User Guide Issue 5 Page i
1073 & 1084 User Manual AM5028
Introduction
These 45 series modules are the same as the original designs, and contain all of the original
components.
1073 Channel Amplifiers
These very popular sounding mic pre's are considered by many to capture the very essence of the
Neve sound. In manufacture since the early 1970s, the Class A design offers 3 bands of EQ with
one fixed high frequency and a high pass filter.
1084 Channel Amplifiers
Based on the same technology as the 1073s, the 1084s again deliver the unique sound and quality
of Neve. However, the 1084s offer additional features, including 3 switchable EQ bands with cut
and boost, a high Q for presence and low pass/high pass filters.
High Pass Filter (resistor modification)
Important Note
The high pass filter in both the 1073 & 1084 modules is a passive design and as such must be
correctly terminated to achieve a maximally flat response.
In order to achieve this there is a 5k1 resistor fitted inside the module on the back connector
between pin E (0v) and pin K (fader send) see diagram below:
In situations where the fader connection is not used (most Neve 45 series consoles except
BCM10's) then the resistor remains in place.
In situations where the fader connection is used (BCM10's and AMS Neve 1073/1084 racks)
then the 5k1 resistor should be disconnected and replaced with a fader or potentiometer whose
value is 4k7 / 5k ohms.
Failure to do so will result in incorrect levels and uneven frequency response.
User Guide Issue 5 Page 1
1073 & 1084 User Manual AM5028
Installation
The 1073s and 1084s are available as stand-alone modules, or in a choice of two housings.
The 3U rack houses two modules mounted horizontally in a 19" rack-mounting unit.
The 5U rack houses eight modules mounted vertically in a 19" rack-mounting unit.
Both have rear panels with XLRs for transformer balanced I/O.
The 3U rack rear panel has a fused, voltage selector IEC mains input connector. The 5U rack has a
free standing AC supply with a fused, voltage selector IEC mains input connector and connects to
the rack via a connector and a 1.5 meter cable.
Modules of any combination can be fitted into a rack unit.
Example: 5U Rack fitted with1084 modules
Additional Information
*Rack Mount Instructions *_
A) Elevated Operating Ambient - If installed in a closed or multi-unit rack assembly, the
operating ambient temperature of the rack environment may be greater than room ambient.
Therefore, consideration should be given to installing the equipment in an environment
compatible with the maximum ambient temperature (Tma) specified by the manufacturer.
B) Reduced Air Flow - Installation of the equipment in a rack should be such that the amount of
air flow required for safe operation of the equipment is not compromised.
C) Mechanical Loading - Mounting of the equipment in the rack should be such that a hazardous
condition is not achieved due to uneven mechanical loading.
D) Circuit Overloading - Consideration should be given to the connection of the equipment to
the supply circuit and the effect that overloading of the circuits might have on overcurrent
protection and supply wiring. Appropriate consideration of equipment nameplate ratings
should be used when addressing this concern.
E) Reliable Earthing - Reliable earthing of rack-mounted equipment should be maintained.
Particular attention should be given to supply connections other than direct connections to the
branch circuit (e.g. use of power strips).
Recommended Tma = 50 deg C
User Guide Issue 5 Page 2
1073 & 1084 User Manual Dimensions
Mains Voltage Adjustment
1.) Switch off unit.
2.) Remove fuse.
3.) Turn inner barrel with screwdriver or coin until correct voltage figure is under the white
arrow on the housing.
4.) Replace fuse.
Dimensions
Stand-alone Modules Width Height Depth Approx.
mm (inches) mm (inches) mm (inches) Weight
kg (lbs)
1073 Module 45 (1.8) 222 (8.75) 254 (10) 2.5 (5.5)
1084 Module 45 (1.8) 222 (8.75) 254 (10) 2.5 (5.5)
19" Rack Mounting U Depth Height Approx. Weight
mm (inches) mm (inches) kg (lbs)
2 Module Version 3 405 (16) 133 (5.25) 11 (24.2) *
8 Module Version 5 405 (16) 222 (8.75) 30 (66) *
* Fully populated rack
User Guide Issue 5 Page 3
1073 & 1084 User Manual Power Requirements
Power Requirements
Rack Units 3U 5U
Rated Voltage 100-230V AC 100-230V AC
Rated Frequency 50-60 Hz 50-60Hz
Rated Current 0.5A Max 0.8A Max
Primary Protection Fuse:
Operating Voltage 100-230V AC 100-230V AC
Fuse Rating and Type T0.5A H 250V T1A H 250V
20mm x 5mm CERAMIC 20mm x 5mm CERAMIC
Location IEC Mains connector IEC Mains connector
Secondary Protection Fuse:
Output Voltage 24V DC
Fuse Rating and Type T 2.0A L 250V
20mm x 5mm GLASS
Location F1
Output Voltage 48V DC
Fuse Rating and Type T 250mA L 250V
20mm x 5mm GLASS
Location F2
Modules Power
1073 Module 106mA