AM-77 Reference Class
Dual-Mono Pre-Main Amplifier
Owner’s Manual
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FCC Declaration of Conformity - United States only
This device complies with Part 15 of the FCC rules. Operation is subject to the following two conditions: (1) This device may not cause
harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
FCC WARNING:
Changes or modifications to this unit not expressly approved by the party responsible for compliance could void the user's authority to
operate the equipment.
NOTE:
This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to Part 15 of the FCC Rules.
These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment
generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause
harmful interference to radio communications. However, there is no guarantee that interference will not occur in a particular installation.
If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off
and on, the user is encouraged to try to correct the interference by one or more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.
Canadian Notice (Avis Canadien)
Class B Equipment
This Class B digital apparatus meets all requirements of the Canadian Interference-Causing Equipment Regulations.
Cet appareil numérique de la classe B respecte toutes les exigences du Règlement sur le matériel brouilleur du Canada.
3
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This products complies with the EMC Directive (89/336/EEC) and the Low Voltage Directive (73/23/EEC) issued by the Commission
of the European Community.
Compliance with these directives implies conformity to the following European Norms (in parentheses are the equivalent international
standards and regulations):
o EN55022 (CISPR 22) - Electromagnetic Interference
o EN55024 (IEC61000-4-2, 3, 4, 5, 6, 8, 11) - Electromagnetic Immunity
o EN61000-3-2 (IEC61000-3-2) - Power Line Harmonics
o EN61000-3-3 (IEC61000-3-3) - Power Line Flicker
o EN60950 (IEC60950) - Product Safety
4
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WARNINGS
The exclamation point within an equilateral triangle is intended to alert the user to the presence of important
operating and maintenance (servicing) instructions in the literature accompanying this component.
!
This component weighs over 40 kilograms. Do not place this component on an unstable cart, stand, tripod,
bracket or table as the component may fall causing serious injury to a child or adult and serious damage to the
unit. An appliance and cart combination should be moved with care. Quick stops, excessive force and uneven
surfaces may cause the component and cart combination to overturn.
Any mounting of the device on a wall or ceiling should follow the manufacturer’s instructions and should use a
mounting accessory recommended by the manufacturer.
Read and follow all the safety and operating instructions before connecting or using this component.
All warnings on the component and in its operating instructions should be adhered to.
Retain this Owner’s Manual for future reference.
Do not use this unit near water; for example, near a bath tub, washbowl, kitchen sink, laundry tub, in a wet
basement or near a swimming pool.
Unplug the component from the wall outlet before cleaning. Never use benzine, thinner or other solvents for
cleaning; use only a soft damp cloth.
5
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Care should be taken so that objects do not fall, and liquids are not spilled into the enclosure through any
openings.
This component should be serviced only by qualifiedAMR service personnel when:
A. The power cable or the power input socket has been damaged;
B. Objects have fallen, or liquid has been spilled into the component;
C. The component has been exposed to rain or liquids of any kind;
D. The component does not appear to operate normally or exhibits a marked change in performance;
E. The component has been dropped or the enclosure has been damaged.
DO NOT ATTEMPT SERVICING OF THIS UNIT-YOURSELF. REFER SERVICING
TO QUALIFIED AMR SERVICE PERSONNEL
Upon completion of any servicing or repairs, request the service point’s assurance that only AMR Authorised
Replacement Parts with the same characteristics as the original parts have been used, and that the routine
safety checks have been performed to guarantee that the component is in a safe operating condition.
REPLACEMENT WITH UNAUTHORIZED PARTS MAY RESULT IN FIRE,
ELECTRIC SHOCK OR OTHER HAZARDS
6
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Precautions
This equipment has been tested and found to comply with the limits set out in the EMC Directive using a
connection cable shorter than 3 metres.
On power sources
The mains power cable should be routed so that it is not likely to be walked on or pinched, especially near the
plug or back panel receptacle. The component should not be disconnected from theAC power source as long as
it is connected to the wall outlet, even if the component itself has been turned off.
If this component is not going to be used for a long time, be sure to disconnect the component from the wall
outlet. To disconnect the AC power cable, grasp the plug itself; never pull the cable.
CAUTION
RISK OF ELECTRIC SHOCK
!
On placement
With a total of 2 thermionic electron valves, the AM-77 may become warm during operation. This is normal.
Given this, it is imperative that the AM-77 when installed, its location or position DOES NOT interfere with its
proper ventilation.
For example, it should not be situated on a bed, sofa, rug or similar surface that may block the top or bottom
ventilation openings; or placed in a built-in installation, such as a bookcase or cabinet, that may impede the flow
of air through its top and bottom ventilation openings.
Do not place the component in a location near heat sources, or in a place subject to direct sunlight, excessive
dust, or mechanical shock. Do not place the component in an inclined position. It is designed to be operated in a
7
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horizontal position only. Do not place heavy objects on the component.
Keep the component away from equipment with strong magnets, such as microwave ovens or large loudspeakers.
To prevent fire or shock hazard, do not place vessels filled with liquids, such as vases, on the component.
Touch-Sensitive Buttons
On the front fascia of this AMR component are touch-sensitive buttons. Due to the wide variance of climes
around the world, instances may arise where to activate a button:
- the touching finger may be required to be in contact with both the button and the front fascia to register;
- the touching finger may have to touch the chassis to discharge any static electricity prior to button selection.
Running-In
AMR estimates that theAM-77 may take between 300-500 operating hours for all of the internal components to
be fully-broken in. Please anticipate the sonic performance of theAM-77 to settle only after it has been used for
this approximate length of time.
Stand-By
Please note that the solid state section needs to find its equilibrium and due to the (unavoidable) use of electro-
lytic capacitors (and an effect called soakage) around 24-48 hours of ‘standby’ (or operation) are required to
stabilise performance. Therefore, ‘standby’ does not shut down the solid-state sections, only the valves.
8
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Contents
WARNINGS
5
Section 1 - Unpacking and Setup
1a. Unpacking
11
12
1b. Setup
Section 2 - Component Overview
2a. Start-Up
15
Section 3 - Advanced Features
25
25
28
30
31
3a. Labeling of Inputs and Setting Level Offset
3b. Setting Fixed Input Level
3c. OptiMains® Protection for Excessive Under/Over-Voltages
3d. OptiProtect® Speaker Overload Protection
9
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Section 4 - System Configurations
4a. OptiOperation® Different System Configurations
4b. Switching and Connection Diagrams for Different Modes
33
33
41
Section 5 - Additional Connectivity
5a. Input for iPod/other portable music players
5b. ‘HiFi/Pro’ Switches for Balanced XLR inputs
5c. RS232 ‘Options’ Connector
53
53
54
55
Section 6 - Technical Features
57
Appendix - Troubleshooting & Maintanence
Troubleshooting
Maintenance
58
58
58
Specifications
59
10
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Section 1 - Unpacking and Setup
Figure 1.1 - Front Panel of the AM-77
-
DUAL
MONO
-
AMPLIFIER
AM
7
7
Figure 1.2 - Rear Panel of the AM-77
Speaker
Output
Balanced
Input
Speaker
Output
Power
_
+
On
Off
_
+
HiFi
Pro
-
Dual Mono
Designed
-
In
Amplifier
Out
AM 77
in Great
and Engineered
Britain
1
2
3
4
5
Mode
Sync
R
L
L
M
L
R
M
M
IR Link
Option
R
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
Under normal
operation,set
all switches to
to
details.
No User Serviceable
For service,contact
Components
your Authorised
CAUTION
RISK OF ELECTRIC
DO NOT OPEN
Inside.
the default bold
(
)position
ATTENTION
.Please refer
the instruction
manual for further
SHOCK
RISQUE
DE CHOC ELECTRIQUE
NE PAS OUVRIR
Dealer or Distributor
this equipment
.Any modifications
will void all warranties
to
.
!
SERIAL
NO.
11
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Thank you for purchasing this AMR reference class component.
We hope you derive as much pleasure from using this component as we have enjoyed making it for you.
1a. Unpacking
This section refers to the unpacking of the AM-77 and its subsequent setup.
Upon unpacking, please find:
Please that check
all contents are
present
i.
AM-77 Reference Class Dual-Mono Pre-Main Amplifier.
RC-77 Remote Commander (with 2 x AAA batteries).
ii.
iii. PC-77 OptiLink® Reference mains power cable.
iv.
v.
IC-77 OptiLink® Reference interconnect cable (XLR-type).
Synchronisation (3.5mm jack) cable (for linking-up multiple AM-77s).
vi. AM-77 Owner’s Manual.
vii. Quick-Start Card.
viii. AMR Warranty Card.
ix. AMR Test Disk.
x.
Aluminium professional flightcase.
Please ensure that all items are present. Should an item be missing, please contact yourAMR distributor/dealer.
12
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1b. Setup
Pre-Main Stereo Amplifier Connection
Default pre-main
mode: theAM-77
as an integrated
amplifier
The following diagrams illustrate the standard connection of theAM-77 in pre-main stereo amplifier mode. This
is the default factory setting and is suitable for the majority of audio systems. Figure 1.3 depicts the use of
standard banana/spade speaker connectors while figure 1.4 illustrates the use of Speakon connectors.
Speaker R
Speaker L
1
0
9
5
0
0
0
0
0
1
0
9
8
7
6
5
0
0
0
0
0
0
S
e
n
s
e
i
t
i
v
i
t
y
:
8
7
d
B
S
e
n
s
e
i
t
i
v
i
t
y
:
87dB
I
m
p
d
a
n
c
e
:
8
O
1
h
m
s
W
W
H
F
I
m
p
d
a
n
c
e
:
8
O
1
h
m
s
W
W
HF
C
P
o
n
t
.
P
o
w
e
r
H
a
n
d
d
i
n
g
g
:
5
0
0
0
p
C
P
o
n
t
.
P
o
w
e
r
H
a
n
d
d
i
n
g
g
:
5
0
0
0
p
L
e
v
e
l
A
d
j
u
s
t
m
e
n
t
L
e
v
e
l
A
d
j
ustment
e
a
k
P
r
o
g
.
H
a
n
i
n
n
:
6
e
a
k
P
r
o
g
.
H
a
n
i
n
n
:
6
R
e
s
i
s
t
o
r
R
e
s
i
s
tor
F
r
e
q
u
e
n
c
y
R
e
s
p
o
s
e
:
(
s
e
e
g
r
a
h
)
F
r
e
q
u
e
n
c
y
R
e
s
p
o
s
e
:
(
s
e
e
g
r
a
h)
1
0
0
1
0
0
0
1
0
0
0
0
1
0
0
1
0
0
0
1
0
0
0
0
F
r
e
q
u
e
n
c
y
(
H
z
)
F
r
e
q
u
e
n
c
y
(
H
z
)
L
e
S
d
-
7
7
P
r
o
f
e
s
s
i
o
n
a
l
M
o
n
i
t
o
r
t
L
e
S
d
-
7
7
P
r
o
f
e
s
s
i
o
n
a
l
M
o
n
i
t
o
r
t
D
e
s
i
g
n
a
n
d
E
n
g
i
n
e
e
r
e
d
i
n
G
r
e
a
B
r
i
t
a
i
n
D
e
s
i
g
n
a
n
d
E
n
g
i
n
e
e
r
e
d
i
n
G
r
e
a
Britain
H
F
HF
L
F
LF
Pro
HiFi
I
N
O
U
T
I
N
OUT
Speaker Cable
Speaker Cable
Warning: ensure
no speaker
Speaker
Output
Speaker
Output
Balanced
Input
Power
Mode
On
Off
_
_
+
+
HiFi
Pro
In
Out
-
-
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
connector is in
contact with the
chassis to cause
a short-circuit!
1
2
3
4
5
Sync
Mode
R
L
L
M
L
R
M
M
IR Link
Option
R
M
L
R
M
M
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
CAUTION ATTENTION
SERIAL NO.
SHOCK
N
D
C
H
O
C
L
E
C
T
R
I
Q
U
E
R
I
S
K
O
D
F
O
E
N
L
E
O
C
T
T
O
R
P
I
C
E
R
I
S
Q
U
E
E
E
N
E
PA
S
OUVRIR
!
AM-77
Interconnect Cable
Interconnect Cable
Power
Amp
Int
Amp
Analog
Outputs
Analog
Outputs
Power
On
Off
-
Compact Disk Processor CD 77
Designed and Engineered in Great Britain
USB Input
IR Link
CLASS 1
LASER PRODUCT
!
R
L
～
AC IN
90V 135V
190V 260V
N
o
U
F
s
o
r
e
r
r
s
o
q
S
e
v
r
v
e,
t
e
i
c
e
c
u
a
o
t
w
b
n
o
i
l
t
r.
l
e
a
C
o
y
y
m
p
r
o
n
e
Authorised
n
t
s
I
n
s
i
d
e
.
CAUTION ATTENTION
e
r
i
i
c
s
c
t
o
u
to
R
I
S
K
O
F
E
L
E
C
T
T
R
I
C
S
H
O
C
K
R
I
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Q
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E
C
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T
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t
a
h
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s
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r
i
b
A
n
m
a
o
l
d
i
f
i
c
a
t
i
o
n
s
l
v
o
i
d
l
warranties.
D
O
N
O
OPEN
N
E
PA
S
O
U
V
R
I
R
e
u
i
p
m
n
t
SERIAL NO.
CD-77
13
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Figure 1.3 - System connection using banana plug/spade connector equipped speaker cables
Speaker R
Speaker L
1
0
9
8
7
6
5
0
0
0
0
0
0
1
0
9
8
7
6
5
0
0
0
0
0
0
S
e
n
s
e
i
t
i
v
i
t
y
:
8
7
d
B
S
e
n
s
e
i
t
i
v
i
t
y
:
87dB
I
m
p
d
a
n
c
e
:
8
O
1
h
m
s
W
W
H
F
I
m
p
d
a
n
c
e
:
8
O
1
h
m
s
W
W
HF
C
P
o
n
t
.
P
o
w
e
r
H
a
n
d
d
i
n
g
g
:
5
0
0
0
p
C
P
o
n
t
.
P
o
w
e
r
H
a
n
d
d
i
n
g
g
:
5
0
0
0
p
L
e
v
e
l
A
d
j
u
s
t
m
e
n
t
L
e
v
e
l
A
d
j
ustment
AMR recom-
mends the
e
a
k
P
r
o
g
.
H
a
n
i
n
n
:
e
a
k
P
r
o
g
.
H
a
n
i
n
n
:
6
6
R
e
s
i
s
t
o
r
R
e
s
i
s
tor
F
r
e
q
u
e
n
c
y
R
e
s
p
o
s
e
:
(
s
e
e
g
r
a
h
)
F
r
e
q
u
e
n
c
y
R
e
s
p
o
s
e
:
(
s
e
e
g
r
a
h)
1
0
0
1
0
0
0
1
0
0
0
0
1
0
0
1
0
0
0
1
0
0
0
0
F
r
e
q
u
e
n
c
y
(
H
z
)
F
r
e
q
u
e
n
c
y
(
H
z
)
L
e
S
d
-
7
7
P
r
o
f
e
s
s
i
o
n
a
l
M
o
n
i
t
o
r
t
L
e
S
d
-
7
7
P
r
o
f
e
s
s
i
o
n
a
l
M
o
n
i
t
o
r
t
D
e
s
i
g
n
a
n
d
E
n
g
i
n
e
e
r
e
d
i
n
G
r
e
a
B
r
i
t
a
i
n
D
e
s
i
g
n
a
n
d
E
n
g
i
n
e
e
r
e
d
i
n
G
r
e
a
Britain
H
F
HF
L
F
LF
sonically supe-
rior Speakon
connectors
Pro
HiFi
I
N
O
U
T
I
N
OUT
Speaker Cable
Speaker Cable
Speaker
Output
Speaker
Output
Balanced
Input
Power
Mode
On
Off
_
_
+
+
HiFi
Pro
In
Out
-
-
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
1
2
3
4
5
Sync
Mode
R
L
L
M
L
R
M
M
IR Link
Option
R
M
L
R
M
M
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
CAUTION ATTENTION
E
L
E
C
T
R
I
Q
U
E
SERIAL NO.
R
I
S
K
O
F
E
L
E
C
T
T
R
I
C
SHOCK
R
I
S
Q
U
E
D
E
C
H
O
C
N
E
PA
S
OUVRIR
!
D
O
N
O
O
P
E
N
AM-77
Interconnect Cable
Interconnect Cable
Power
Amp
Int
Amp
Analog
Outputs
Analog
Outputs
Power
On
Off
-
Compact Disk Processor CD 77
Designed and Engineered in Great Britain
USB Input
IR Link
CLASS 1
LASER PRODUCT
!
R
L
～
AC IN
90V 135V
190V 260V
N
o
U
F
s
o
r
e
r
r
s
o
q
S
e
v
r
v
e,
t
e
i
c
e
c
u
a
o
t
w
b
n
o
i
l
t
r.
l
e
a
C
o
y
y
m
p
r
o
n
Authorised
e
n
t
s
I
n
s
i
d
e
.
CAUTION ATTENTION
e
r
i
i
c
s
c
t
o
u
to
R
I
S
K
O
F
E
L
E
C
T
T
R
I
C
S
H
O
C
K
R
I
S
Q
U
E
D
E
C
H
O
C
E
L
E
C
T
R
I
Q
U
E
D
e
t
a
h
l
i
e
s
r
D
r
i
b
A
n
m
a
o
l
d
i
f
i
c
a
t
i
o
n
s
l
v
o
i
d
l
warranties.
D
O
N
O
OPEN
N
E
PA
S
O
U
V
R
I
R
e
u
i
p
m
n
t
SERIAL NO.
CD-77
Figure 1.4 - System connection using Speakon connector equipped speaker cables
i.
Connect the respective spade/banana/Speakon connectors of the speaker cables to the AM-77.
ii.
Connect the source/s via the respective left and right XLR or RCA connectors to Inputs 1-5.
iii. Connect the IEC of the PC-77 mains power cable to the AM-77 and the socket to a mains source.
14
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Section 2 - Component Overview
Figure 2.1 - AM-77 Front Fascia
The plastic
protective film
covering the
display may be
removed
-
DUAL
MONO
-
AMPLIFIER
AM
77
F1
F2
F3
F4 F5
F1. STANDBY switch: to place the AM-77 in active or standby mode.
F2. SOURCE selection buttons: to select between the 5 different inputs.
F3. VOLUME buttons: to adjust the volume level.
F4. iPod 3.5 Input Connector: for the connection of an iPod or similar portable music device.
F5. iPod USB charging connector: for re-charging an iPod or similar portable music device.
15
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Figure 2.2 - AM-77 Rear Panel
Warning: en-
sure no
speaker con-
nector is in
contact with
the chassis
Speaker
Output
Balanced
Input
Speaker
Output
Power
_
+
On
Off
_
+
HiFi
Pro
-
Dual
Designed
-
In
Mono
Amplifier
and Engineered
Out
AM 77
in Great
Britain
1
2
3
4
5
Mode
Sync
R
L
L
M
L
R
M
M
IR Link
Option
R
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V
Under normal
the default
the instruction
operation,set
all switches
to
to
No User Serviceable
For service,
Dealer or Distributor
this equipment
Components
Inside.
CAUTION
RISK OF ELECTRIC
ATTENTION
(bold)position
.Please refer
contact your
Authorised
.Any modifications
warranties.
manual for
260V
further details
.
SHOCK
DO NOT OPEN
RISQUE
DE CHOC ELECTRIQUE
NE PAS OUVRIR
to
!
will void all
SERIAL
NO.
R1
R3
R5
R7
R11
R2
R4
R6
R8
R10
R12
R1. SPADE/BANANA outputs: for connection of standard termination speaker cables.
R2. SPEAKON outputs: for connection of Speakon terminated speaker cables.
R3. HIFI/PRO switch: to allow for a source with transformer balanced output*.
R4. INT/POWER Amp switch: to alternate between Pre-Main and Power Amplification setings*.
R5. MODE switch: to alternate between Stereo/Monoblock/Bi-Amplification settings*.
R6. INPUT 1: shared XLR and RCA input, for signal input of source equipment.
16
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R7. INPUTS 2-5: RCA inputs, for signal input of source equipment.
R8. SYNC connectors: for connection of more than one AM-77*.
R9. RS232 option connector: to facilitate future upgrades*.
R10. Infra-Red Link: for connection of a wireline remote control.
R11. IEC power connector: for the connection of a PC-77 mains power cable to the AM-77.
R12. POWER Switch: to switch on mains electricity to the AM-77.
In the majority of audio systems, theAM-77 is most likely to be operated as a Pre-MainAmplifier: please inspect
the rear panel of the AM-77 to verify that the default settings (in bold) to enable the AM-77 to operate in this
mode are as follows:
1. HIFI/PRO switches are set to ‘HiFi’ (left position)
2. MODE switch is set to ‘LR’ (middle position)
3. INT/POWER switch is set to ‘Int’ (right position)
* Please refer to Sections 3 - 5 for a more detail explanation.
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Figure 2.3 - RC-77 Remote Control
RC1. MENU button: to enter Advanced Features mode*.
RC2. STANDBY button: to place the AM-77 in active or
standby mode.
CD
Pr
ocessor
RC3. SOURCE selection buttons: to select between the 5
different inputs.
RC4. VOLUME buttons: to adjust the volume level.
RC5. MUTE button: to Mute (temporarily turn off sound)
the AM-77.
RC1
RC7
Amplifier
RC6. BRIGHTNESS button: to adjust brightness levels*.
RC2
RC6
RC7. OK button: to be used in Advanced Features mode*.
* Please refer to Section 3 - Advanced Features section for more details
kHz
RC5
IN
RC3
VO
RC4
RC-77: battery installation
L
To install the 2 x AAA batteries, using a Philips screwdriver,
remove the four screws at the four corners of the rear battery
compartment.
REMOTE
C
OMMANDR
RC
-
77
Install the 2 x AAA batteries in the correct direction according
to the baseplate inside the battery compartment.
Replace the battery compartment and the four cover screws.
18
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2a. Start-Up
1. Power On/Off
Press the ‘POWER’ rocker switch (R12) at the rear of the AMP to switch on mains power to the AM-77.
Once powered
OFF: always wait
30 seconds
before switching
on again
To switch the mains power OFF, press again and release. Always WAIT at least 30 seconds before switching
ON again. This is to enable the OptiMains® circuit to shutdown properly.
The display will light up to indicate the unit is switched on and ready for use. This should take just under 1 minute
as the OptiMains® circuit is verifying and the AM-77 is warming up.
The display should flash the message:
O p t i m i s i n g
V o l t a g e
S u p p l y
The display will look like this:
W a r m i n g
45 s
U p
The display will then show the remaining warm-up time.
19
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Once the system check is complete and the OptiMains®circuitry has completed its initiation process, the AM-
77 is ready for operation.
2. Standby
After start-up, pressing the STANDBY button (F1) on either the front fascia or the RC-77 (RC2), the AM-77
will switch to STANDBY mode.
S t a n d b y
3. Source Selection
From either the front fascia of theAM-77 (F2) or the RC-77 (RC3), select the desired source input for playback.
C D
P l a y e r
- 3 6 d B
With PLAY selected from a connected source such as a CD-77, playback is attained.
20
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4. Volume Adjustment
Beware: pro-
longed listening
at high volume
levels is likely to
damage your
hearing
From either the front fascia of the AM-77 (F3) or the RC-77 (RC4), select the desired volume.
While adjusting volume levels, there is an audible “click” from AM-77 and the speakers. This is the normal
operation of the relays within the OptiLevel® direct path precision volume control.
5. Rear Inputs
At the rear of the AM-77, there are 5 inputs for the connection of source components such as the CD-77
compact disk processor or a vinyl source.
Input 1 (R6) is of most consequence because first, while all 5 inputs can be connected via RCAonly, Input 1 also
allows for the optional connection of XLR connectors.
Second, in other configurations where the AM-77 is used in single-channel mode, all other inputs are defeated.
Signal input is allowed only through the LEFT channel (white) of Input 1: via XLR or RCA (Please refer to
Section 4 - System Configurations for a detailed explanation).
6. Speakon Outputs
At the rear of the AM-77 are Speakon female connectors (R2) to allow speaker cables terminated with Speakon
male connectors to be connected to the AM-77.
21
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7. Synch Connectors
At the rear of the AM-77 are Synchronisation ‘In’ and ‘Out’ connection points (R8). This is for the linking of
multiple AM-77s for alternative system configurations. Please refer to Section 4 - System Configurations for
a detailed explanation.
8. Mode switch
At the rear of the AM-77 the ‘Mode’ switch (R5) allows for the AM-77 to alternate between Stereo/Mono-
block/Bi-Amplifier modes. Please refer to Section 4 - System Configurations for a detailed explanation.
9. Int/Power switch
At the rear of the AM-77, the ‘Int/Power’ switch (R4) enables the AM-77 to alternate between pre-main or
power amplification modes. Please refer to Section 4 - System Configurations for a detailed explanation.
10. HiFi/Pro switch
At the rear of the AM-77, the ‘HiFi/Pro’ switch (R3) allows for a source with a transformer balanced output to
be connected to the AM-77. Please refer to Section 5 - Additional Connectivity for a detailed explanation.
11. RS232 option connector
At the rear of the AM-77, the RS232 connector (R9) allows the AM-77 to be upgraded. Please refer to Section
5 - Additional Connectivity for a detailed explanation.
22
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12. Menu (RC-77 only)
The MENU button (RC1) will enter the Advanced Menu system of the AM-77. Please refer to Section 3 -
Advanced Features for a detailed explanation.
13. OK (RC-77 only)
The OK button on (RC7) the RC-77 is for the confirmation of a desired selection within the Advanced Menu
system of the AM-77. Please refer to Section 3 - Advanced Features for a detailed explanation.
14. Mute (RC-77 only)
The MUTE button (RC5) will disengage the volume of the AM-77 and re-engage the volume if it is pressed
again.
15. Brightness (RC-77 only)
The BRIGHTNESS button (RC6) will adjust the display’s brightness at the front fascia of theAM-77. There are
4 different brightness settings including display off.
With its own isolated power supply, with the display ON or OFF, there is no sonic impact upon the AM-77.
23
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Section 3 - Advanced Features
The following section provides instructions to access the AM-77’s advanced features.
3a. Labeling of Inputs and Setting Level Offset
With theAM-77, in one process, it is possible to label each of the 5 inputs with a corresponding source and to set
the respective level offset. This function is recommended only after ALL desired sources have been connected
to the AM-77.
A list of available labels is shown overleaf in chronological order.
The main advantage of setting the level offset is that the volume level will change in real-time, so that the user
may adjust the offset without the need for additional equipment. By using this function and selecting the desired
level offset, one may ‘match’ the volume level of all inputs so that when switching between sources, the volume
remains the same, thereby avoiding undesirable and potentially equipment-damaging noise levels.
For example:
Input 1 CD Player (2V output)
Input 2 LP (1V output)
Offset: 0dB
Offset: +6dB
Input 3 SACD Player (4V output) Offset: -6dB
25
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List of available inputs:
All types of
sources
accomodated
15. MP3 Player
16. PC Audio
1. Input X (default)
2. Aux I
17. Phono Stage
18. Plasma TV
3. Aux II
4. Aux III
19. Pre-Amplifier
20. SACD Player
21. Tape Deck
5. CD Processor
6. D/A Processor
7. DVD Player
8. DVD Recorder
9. HD Recorder
10.HDTV
22. Television
23. Tuner
24. Turntable
25. Uni Player
26. Video Player
27. Home Theatre Direct
11.Home Theatre
12.iPod
13.LCD TV
14.Media Center
26
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The following steps outline the procedure to label all the inputs and set the respective level offset.
The AM-77’s default labelling of its inputs starts from ‘Input 1’and runs through to ‘Input 5’:
i. Press ‘MENU’ (RC1) on the RC-77.
ii. The display will flash ‘Labelling Input 1’.
iii. The 2nd line of the display will commence with the first from a list of input labels (please see the
previous page for a list of input labels).
iv. Scroll using the ‘+/- buttons’ of the Volume (RC4).
iv. At the desired label, press ‘OK’ (RC7) to store the new label for that specific input.
v. The display will flash ‘Level Offset’. On the RC-77, using ‘+/-’ volume buttons, select the desired
level, press ‘OK’ (RC7) to confirm.
vi. The display will move onto ‘Labelling Input 2’.
vi. Repeat this process for the other inputs.
vii. One the last input, Input 5 has been programmed, press ‘OK’.
viii. Normal operation will resume at Input 5. If this is not the desired input, use SOURCE (F2) or (RC3)
to select the input of choice to resume listening.
27
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3b. Setting Fixed Input Level
When using the AM-77 as part of a home theatre system with an external processor controlling the overall
system volume, it is possible to program one of the five input sources to have a fixed level of Input such as for
a home theatre system of either 0.775V (0dbu) or 1.55V (+6dBu). This allows the 2-Channel music system to be
seamlessly integrated into a high performance multi-channel home cinema system.
- Go to Section 3a and follow the instructions to select the last label:
H o m e
T h e a t r e
D i r e c t
- Simultaneously press ‘-’ volume on the front fascia of the AM-77 and ‘OK’ on the RC-77.
28
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- Having entered the ‘Fixed Input’ menu, now select:
HTD mode:
always use an
Fixed Input 1.55V = +6dBu
external pre-amp
as this mode will
switch the AM-
77 to full volume!
or
Fixed Input 0.775V = 0dBu
Warning! By selecting Home Theater Direct mode, the volume of the amplifier will be switched to full.
Hence if it is used incorrectly, it will damage the connecting speakers. AMR assumes no responsibility for
any speaker damage arising from the use of the AM-77.
29
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3c. OptiMains® Protection for Excessive Under/Over-Voltages
The AM-77 is fitted with the OptiMains® system to condition and adjust the incoming mains supply for best
operation under all normal mains conditions (including situations that will cause audible problems without Opti-
Mains®).
Sometimes there
are excessive
mains fluctua-
tions
In almost every country throughout the world, instances do arise where fluctuations in the main electricity
exceeds that of a correctly operating mains supply and any electrical item/product is no longer properly served.
In the case of extreme power surges, brown outs or other exceptional/unexpected conditions that exceed the
safety margins, the OptiMains® system automatically will switch off the mains power to the internal parts of
equipment to prevent any damage from occuring.
If the display reads:
...OptiMains®
will detect and
protect
A C
V o l t a g e
O u t s i d e
R a n g e !
O p e r a t i n g
Power OFF your AMR component and wait at least 5 minutes. If and when the mains electricity has been
deemed to have returned to normal (such as during a brown out and the lights have dimmed but have returned to
normal brightness) then power up your AMR component as per the manual’s instructions.
30
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3d. OptiProtect® Speaker Overload Protection
Within OptiProtect® the AM-77 has an in-built speaker protection circuit. Unlike common protection systems
which are in series with the speaker output and where the music signal always passes through the protection
circuit, the AMR speaker protection system acts as a crowbar circuit shorting across the output - hence it is
separate from the audio circuitry and does not affect the sound quality unless it is engaged.
This is mainly a final safeguard against equipment failure and/or extreme levels of over-driving the amplifier and
speakers. When the display shows:
If there are any
questions, please
contact your
S p e a k e r
P r o t e c t i o n
nearest AMR
distributor/dealer
E n g a g e d !
This indicates that the AM-77 has detected an output condition that could potentially damage the speakers
connected to it.
Normally switching theAM-77 off, waiting 20 seconds and switching it back on will reset the protection circuit
if the cause was for example, excessive signal levels. In the extremely rare event that an internal malfunction of
theAM-77 is the cause for the protection circuit to engage, the protection will re-engage on switch-on, indicating
the need for the AM-77 to be serviced.
31
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Section 4 - System Configurations
4a. OptiOperation® Different System Configurations
In keeping with AMR’s philosophy that ‘no one sound fits all’ the AM-77 is also adaptable to suit virtually any
system configuration: able to operate at one end, as a pre-main stereo amplifier and at the other, as a single-
channel power amplifier. In pre-main amplifier mode, theAM-77 will use both the pre- and power amplification
sections: theAM-77 controls volume level and input selection controls. In power amplification mode, theAM-77
wil require an external, separate pre-amplifier to handle volume and input selection duties.
It is assumed all
prior sections
have been read &
understood with
all requisite
connections
made
The following section describes alternative configurations for the AM-77 beyond the factory default: pre-main
stereo amplifier setting. With diverse system permutations in mind, theAM-77 has built-in, six OptiOperation®
modes to seamlessly integrate it into virtually any audio system configuration:
Mode I.
Pre-Main Stereo amplifier mode (default)
Pre-Main Monoblock amplifier mode
Pre-Main Bi-amplifier mode (horizontal biamping)
Power amplifier Stereo mode
Mode II.
Mode III.
Mode IV.
Mode V.
Mode VI.
Six different
modes
Power amplifier Monoblock mode
Power Bi-amplifier mode (horizontal biamping)
Supreme adapt-
ability
The combination of synchronising multipleAM-77s together in practical terms is limited only by room size and
cost. This approach allows for systems at the core, comprising of any number of AM-77s to be constructed to
any level of complexity.
33
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In short, theAM-77’s flexibility is limited only to that of the imagination. For example, one may employ:
- 3xAM-77s synchronised along with a high-quality digital crossover to drive a fully-active 3-way
speaker system to the highest possible level of sound reproduction or;
- 3xAM-77s synchronised for a multi-channel surround sound system or;
- 2xAM-77s synchronised in monoblock or bi-amplification mode to drive suitably-equipped speakers.
Figure 4.0 - Connection of more than one AM-77
Before an
alternative
Speaker
Output
Speaker
Output
Speaker
Output
Speaker
Output
Balanced
Input
Balanced
Input
Power
Power
On
Off
On
Off
_
_
_
_
+
+
+
+
HiFi
Pro
HiFi
Pro
In
Out
In
Out
-
-
-
-
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
1
2
3
4
5
Sync
1
2
3
4
5
Sync
Mode
Mode
R
L
R
L
configuration is
selected,AL-
WAYS ensure
theAM-77 is
switched OFF
L
L
M
L
R
M
M
M
L
R
M
M
IR Link
IR Link
R
R
Option
Option
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
CAUTION ATTENTION
CAUTION ATTENTION
E
L
E
C
T
R
I
Q
U
E
SERIAL NO.
E
L
E
C
T
T
R
I
C
S
H
O
C
K
R
I
S
Q
U
E
D
E
C
H
O
C
E
L
E
C
T
R
I
Q
U
E
SERIAL NO.
R
I
S
K
O
F
E
L
E
C
T
T
R
I
C
SHOCK
R
I
S
Q
U
E
D
E
C
H
O
C
R
I
S
K
O
F
N
E
PA
S
O
U
V
R
I
R
!
D
O
N
O
O
P
E
N
N
E
PA
S
OUVRIR
!
D
O
N
O
O
P
E
N
AM-77
AM-77
Speaker
Output
Speaker
Output
Speaker
Output
Speaker
Output
Balanced
Input
Balanced
Input
Power
Power
On
Off
On
Off
_
_
_
_
+
+
+
+
HiFi
Pro
HiFi
Pro
In
Out
In
Out
-
Dual Mono Amplifier AM 77
-
-
-
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
Designed and Engineered in Great Britain
1
2
3
4
5
Sync
1
2
3
4
5
Sync
Mode
Mode
R
L
R
L
L
L
M
L
R
M
M
M
L
R
M
M
IR Link
IR Link
R
R
Option
Option
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
CAUTION ATTENTION
CAUTION ATTENTION
E
L
E
C
T
R
I
Q
U
E
SERIAL NO.
E
L
E
C
T
T
R
I
C
S
H
O
C
K
R
I
S
Q
U
E
D
E
C
H
O
C
E
L
E
C
T
R
I
Q
U
E
SERIAL NO.
R
I
S
K
O
F
E
L
E
C
T
T
R
I
C
SHOCK
R
I
S
Q
U
E
D
E
C
H
O
C
R
I
S
K
O
F
N
E
PA
S
O
U
V
R
I
R
!
D
O
N
O
O
P
E
N
N
E
PA
S
OUVRIR
!
D
O
N
O
O
P
E
N
AM-77
AM-77
34
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The following pages provide an outline of the theoretical wiring system behind each of the six different config-
urations with a brief accompanying summary
Figure 4.1 - Mode I: Pre-Main Stereo
Pre
Amp
(L)
Power
Amp
(L)
L
Left
Speaker
•
Standard system with AM-77 as the only
amplifier.
Pre
Amp
(R)
Power
Amp
(R)
R
1st AM-77
Right
Speaker
35
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Figure 4.2 - Mode II: Pre-Main Monoblock
Pre
Amp
(L)
Power
Amp
(L)
L
•
•
Need 2 or more AM-77s.
Power
Amp
(R)
Drive low impedance speakers that only have
one set of terminal connections.
1st AM-77
Left
Speaker
•
~600W/2Ohm RMS and ~300W/1Ohm RMS
without current clipping. This is best suited
drive very low impedance speakers
to
(Apogee
Diva et al).
Pre
Amp
(L)
Power
Amp
(L)
R
Power
Amp
(R)
2nd AM-77
Right
Speaker
36
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Figure 4.3 - Mode III: Pre-Main Bi-Amplifier
Pre
Amp
(L)
Power
Amp
(L)
L
•
•
Need 2 or more AM-77s.
Power
Amp
(R)
Drive speakers that have more than one set
of terminal connections with improved per-
formance and dynamic range.
1st AM-77
Left
Speaker
•
Virtually all the power supply power is avail-
able to the low frequency channel with imp-
proved channel separation.
Pre
Amp
(L)
Power
Amp
(L)
R
Power
Amp
(R)
2nd AM-77
Right
Speaker
37
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Figure 4.4 - Mode IV: Power Stereo
•
sec
Same as Mode I, except the Pre-Amplifier
tion has been bypassed.
Power
Amp
(L)
(L)
L
Left
Speaker
•
A separate pre-amplifier is needed to control
the volume.
Power
Amp
(R)
R
(R)
1st AM-77
Right
Speaker
38
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Figure 4.5 - Mode V: Power Monoblock
Power
Amp
(L)
L
(L)
•
•
Same as Mode II, except the Pre-Amplifier
section has been bypassed.
Power
Amp
(R)
A separate pre-amplifier is needed to control
the volume.
1st AM-77
Left
Speaker
Power
Amp
(L)
R
(L)
Power
Amp
(R)
2nd AM-77
Right
Speaker
39
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Figure 4.6 - Mode VI: Power Bi-Amplifier
Power
Amp
(L)
L
(L)
•
•
Same as Mode III, except the Pre-Amplifier
section has been bypassed.
Power
Amp
(R)
A separate pre-amplifier is needed to control
the volume.
1st AM-77
Left
Speaker
Power
Amp
(L)
R
(L)
Power
Amp
(R)
2nd AM-77
Right
Speaker
40
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4b. Switching and Connection Diagrams for Different Modes
The following is a description of the switch settings and connections required to engage the various modes.
Figure 4.7 - Mode I: Pre-Main Stereo amplifier (default)
Speaker R
Speaker L
1
0
9
8
7
6
5
0
0
0
0
0
0
1
0
9
8
7
6
5
0
0
0
0
0
0
S
e
n
s
e
i
t
i
v
i
t
y
:
8
7
d
B
S
e
n
s
e
i
t
i
v
i
t
y
:
87dB
I
m
p
d
a
n
c
e
:
8
O
1
h
m
s
W
W
H
F
I
m
p
d
a
n
c
e
:
8
O
1
h
m
s
W
W
HF
C
P
o
n
t
.
P
o
w
e
r
H
a
n
d
d
i
n
g
g
:
5
0
0
0
p
C
P
o
n
t
.
P
o
w
e
r
H
a
n
d
d
i
n
g
g
:
5
0
0
0
p
L
e
v
e
l
A
d
j
u
s
t
m
e
n
t
L
e
v
e
l
A
d
j
ustment
e
a
k
P
r
o
g
.
H
a
n
i
n
n
:
6
e
a
k
P
r
o
g
.
H
a
n
i
n
n
:
6
R
e
s
i
s
t
o
r
R
e
s
i
s
tor
F
r
e
q
u
e
n
c
y
R
e
s
p
o
s
e
:
(
s
e
e
g
r
a
h
)
F
r
e
q
u
e
n
c
y
R
e
s
p
o
s
e
:
(
s
e
e
g
r
a
h)
The default
1
0
0
1
0
0
0
1
0
0
0
0
1
0
0
1
0
0
0
1
0
0
0
0
F
r
e
q
u
e
n
c
y
(
H
z
)
F
r
e
q
u
e
n
c
y
(
H
z
)
L
e
S-
7
7
P
r
o
f
e
s
s
i
o
n
a
l
M
o
n
i
t
o
r
t
L
e
S-
7
7
P
r
o
f
e
s
s
i
o
n
a
l
M
o
n
i
t
o
r
t
D
e
s
i
g
n
d
a
n
d
E
n
g
i
n
e
e
r
e
d
i
n
G
r
e
a
B
r
i
t
a
i
n
D
e
s
i
g
n
d
a
n
d
E
n
g
i
n
e
e
r
e
d
i
n
G
r
e
a
Britain
factory setting
H
F
HF
L
F
LF
Pro
HiFi
I
N
O
U
T
I
N
OUT
Speaker Cable
Speaker Cable
Speaker
Output
Speaker
Output
Balanced
Input
Power
Mode
On
Off
_
_
+
+
HiFi
Pro
In
Out
-
-
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
1
2
3
4
5
Sync
Mode
R
L
L
M
L
R
M
M
IR Link
Option
R
M
L
R
M
M
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
CAUTION ATTENTION
SERIAL NO.
R
I
S
K
O
F
E
L
E
C
T
T
R
I
C
SHOCK
R
I
S
Q
U
E
D
E
C
H
O
C
E
L
E
C
T
R
I
Q
U
E
O
P
E
N
N
E
PA
S
OUVRIR
!
D
O
N
O
AM-77
Interconnect Cable
Interconnect Cable
Power
Amp
Int
Amp
Analog
Outputs
Analog
Outputs
Power
On
Off
-
Compact Disk Processor CD 77
Designed and Engineered in Great Britain
USB Input
IR Link
CLASS 1
LASER PRODUCT
!
R
L
～
AC IN
90V 135V
190V 260V
N
o
U
F
s
o
r
e
r
r
s
o
q
S
e
v
r
v
e,
t
e
i
c
e
c
u
a
o
t
w
b
n
o
i
l
t
r.
l
e
a
C
o
y
y
m
p
r
o
n
Authorised
e
n
t
s
I
n
s
i
d
e
.
CAUTION ATTENTION
e
r
i
i
c
s
c
t
o
u
R
I
S
K
O
F
E
L
E
C
T
T
R
I
C
S
H
O
C
K
R
I
S
Q
U
E
D
E
C
H
O
C
E
L
E
C
T
R
I
Q
U
E
D
e
t
a
h
l
i
e
s
r
D
r
i
b
A
n
m
a
o
l
d
i
f
i
c
a
t
i
o
n
s
to
v
o
i
d
l
warranties.
D
O
N
O
O
P
E
N
N
E
PA
S
O
U
V
R
I
R
e
u
i
p
m
n
t
l
SERIAL NO.
CD-77
This is the factory default setting: the connection for which has been described in detail in Section 1 - Unpack-
ing and Setup. We have illustrated the default switch positions here for ease of reference to re-configure from
an alternative system setup back to the pre-main stereo amplifier mode.
41
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Figure 4.8 - Mode II: Pre-Main Monoblock amplifiers
Pro
HiFi
Speaker R
Speaker
L
Mode
M
L
R
M
M
1
0
9
8
7
6
5
0
0
0
0
0
0
1
0
9
8
7
6
5
0
0
0
0
0
0
S
e
n
s
e
i
t
i
v
i
t
y
:
8
7
d
B
S
e
n
s
e
i
t
i
v
i
t
y
:
87dB
I
m
p
d
a
n
c
e
:
8
O
1
h
m
s
W
W
HF
I
m
p
d
a
n
c
e
:
8
O
1
h
m
s
W
W
HF
C
P
o
n
t
.
P
o
w
e
r
H
a
n
d
d
i
n
g
g
:
5
0
0
0
p
C
P
o
n
t
.
P
o
w
e
r
H
a
n
d
d
i
n
g
g
:
5
0
0
0
p
Level Adjustment
Resistor
Level Adjustment
Resistor
e
a
k
P
r
o
g
.
H
a
n
i
n
n
:
6
e
a
k
P
r
o
g
.
H
a
n
i
n
n
:
6
F
r
e
q
u
e
n
c
y
R
e
s
p
o
s
e
:
(
s
e
e
g
r
a
h
)
F
r
e
q
u
e
n
c
y
R
e
s
p
o
s
e
:
(
s
e
e
g
r
a
h)
1
0
0
1
0
0
0
1
0
0
0
0
1
0
0
1
0
0
0
1
0
0
0
0
F
r
e
q
u
e
n
c
y
(
H
z
)
F
r
e
q
u
e
n
c
y
(
H
z
)
L
e
S
d
-
a
7
7
P
r
o
n
f
e
s
s
i
o
n
a
l
M
n
o
n
i
t
o
r
t
L
e
S
d
-
a
7
7
P
r
o
n
f
e
s
s
i
o
n
a
l
M
n
o
n
i
t
o
r
t
D
e
s
i
g
n
n
d
E
g
i
n
e
e
r
e
d
i
G
r
e
a
B
r
i
t
a
i
n
D
e
s
i
g
n
n
d
E
g
i
n
e
e
r
e
d
i
G
r
e
a
Britain
HF
HF
LF
LF
Power
Amp
Int
Amp
IN
OUT
IN
OUT
Synchronisation Cable
Speaker Cable
Speaker Cable
Speaker
Output
Speaker
Output
Speaker
Output
Speaker
Output
Balanced
Input
Balanced
Input
Power
Power
On
Off
On
Off
_
_
_
_
+
+
+
+
HiFi
Pro
HiFi
Pro
In
Out
In
Out
-
-
-
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
-
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
1
2
3
4
5
Sync
1
2
3
4
5
Sync
Mode
Mode
R
L
R
L
L
L
M
L
R
M
M
M
L
R
M
M
IR Link
IR Link
Option
R
R
Option
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
CAUTION ATTENTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION ATTENTION
RISK OF ELECTRIC SHOCK
RISQUE DE CHOC ELECTRIQUE
DO NOT OPEN
NE PAS OUVRIR
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
SERIAL NO.
SERIAL NO.
!
!
AM-77: Master
AM-77: Slave
Analog
Outputs
Analog
Outputs
Power
On
Off
Interconnect Cable
Interconnect Cable
-
Compact Disk Processor CD 77
Designed and Engineered in Great Britain
USB Input
IR Link
CLASS 1
LASER PRODUCT
!
R
L
～
AC IN
90V 135V
190V 260V
No User Serviceable Components Inside
For service, contact your Authorised
Dealer or Distributor. Any modifications to
this equipment will void all warranties.
.
CAUTION ATTENTION
R
I
S
K
O
F
E
L
E
C
T
T
R
I
C
S
H
O
C
K
R
I
S
Q
U
E
D
E
C
H
O
C
E
L
E
C
T
R
I
Q
U
E
D
O
N
O
OPEN
N
E
PA
S
OUVRIR
SERIAL NO.
CD-77
42
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Note: This function requires at least 2 x AM-77 synchronised pre-main amplifiers.
i. Power OFF via the ‘POWER’ (R12) mains switch at the rear of both AM-77s.
ii. Connect the cable from the ‘Sync Out’ connector (R8) of the ‘master’ amplifier to the ‘Sync In’
connector (R8) of the ‘slave’ amplifier. The amplifier with the cable connected to ‘Sync In’ becomes
‘slaved’ to the other and will automatically follow the ‘master’ AM-77.
iii Using a small flat blade screwdriver, move the ‘MODE’ switch (R5) to the left to select ‘M’.
iv. Using a small flat blade screwdriver, move the ‘INT/POWER AMP’ switch (R4) to the right to select
‘INT AMP’.
v. Repeat this process for the other AM-77.
vi. Power both AM-77s back on via the ‘POWER’ switch (R12).
43
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Figure 4.8 - Mode III: Pre-Main Bi-amplifier (horizontal bi-amping)
Pro
HiFi
Speaker R
Speaker
L
Mode
M
L
R
M
M
1
0
9
8
7
6
5
0
0
0
0
0
0
1
0
9
7
6
5
0
0
0
0
0
0
S
e
n
s
e
i
t
i
v
i
t
y
:
8
7
d
B
S
e
n
s
e
i
t
i
v
i
t
y
:
87dB
I
m
p
d
a
n
c
e
:
8
O
1
h
m
s
W
W
HF
I
m
p
d
a
n
c
e
:
8
O
1
h
m
s
W
W
HF
C
P
o
n
t
.
P
o
w
e
r
H
a
n
d
d
i
n
g
g
:
5
0
0
0
p
C
P
o
n
t
.
P
o
w
e
r
H
a
n
d
d
i
n
g
g
:
5
0
0
0
p
Level Adjustment
Resistor
Level Adjustment
Resistor
e
a
k
P
r
o
g
.
H
a
n
i
n
n
:
6
e
a
k
P
r
o
g
.
H
a
n
i
n
n
:
6
F
r
e
q
u
e
n
c
y
R
e
s
p
o
s
e
:
(
s
e
e
g
r
a
h
)
F
r
e
q
u
e
n
c
y
R
e
s
p
o
s
e
:
(
s
e
e
g
r
a
h)
1
0
0
1
0
0
0
1
0
0
0
0
1
0
0
1
0
0
0
1
0
0
0
0
F
r
e
q
u
e
n
c
y
(
H
z
)
F
r
e
q
u
e
n
c
y
(
H
z
)
L
e
S
d
-
7
7
P
r
o
n
f
e
s
s
i
o
n
a
l
M
n
o
n
i
t
o
r
t
L
e
S
d
-
7
7
P
r
o
n
f
e
s
s
i
o
n
a
l
M
n
o
n
i
t
o
r
t
D
e
s
i
g
n
a
n
d
E
g
i
n
e
e
r
e
d
i
G
r
e
a
B
r
i
t
a
i
n
D
e
s
i
g
n
a
n
d
E
g
i
n
e
e
r
e
d
i
G
r
e
a
Britain
HF
HF
LF
LF
Power
Amp
Int
Amp
IN
OUT
IN
OUT
Synchronisation Cable
Speaker Cable
Speaker Cable
Speaker Cable
Speaker Cable
Speaker
Output
Speaker
Output
Speaker
Output
Speaker
Output
Balanced
Input
Balanced
Input
Power
Power
On
Off
On
Off
_
_
_
_
+
+
+
+
HiFi
Pro
HiFi
Pro
In
Out
In
Out
-
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
-
-
-
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
1
2
3
4
5
Sync
1
2
3
4
5
Sync
Mode
Mode
R
L
R
L
L
L
M
L
R
M
M
M
L
R
M
M
IR Link
IR Link
Option
R
R
Option
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
CAUTION ATTENTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION ATTENTION
RISQUE DE CHOC ELECTRIQUE
RISK OF ELECTRIC SHOCK
DO NOT OPEN
NE PAS OUVRIR
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
SERIAL NO.
SERIAL NO.
!
!
AM-77: Master
AM-77: Slave
Analog
Outputs
Analog
Outputs
Power
On
Off
Interconnect Cable
Interconnect Cable
-
Compact Disk Processor CD 77
Designed and Engineered in Great Britain
USB Input
IR Link
CLASS 1
LASER PRODUCT
!
R
L
～
AC IN
90V 135V
190V 260V
No User Serviceable Components Inside
For service, contact your Authorised
Dealer or Distributor. Any modifications to
this equipment will void all warranties.
.
CAUTION ATTENTION
R
I
S
K
O
F
E
L
E
C
T
T
R
I
C
S
H
O
C
K
R
I
S
Q
U
E
D
E
C
H
O
C
E
L
E
C
T
R
I
Q
U
E
D
O
N
O
O
P
E
N
N
E
PAS
OUVRIR
SERIAL NO.
CD Player
44
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Note: This function requires at least 2 x AM-77 synchronised pre-main amplifiers.
i. Power OFF via the ‘POWER’ (R12) mains switch at the rear of both AM-77s.
ii. Connect the cable from the ‘Sync Out’ connector (R8) of the ‘master’ amplifier to the ‘Sync In’
connector (R8) of the ‘slave’ amplifier. The amplifier with the cable connected to ‘Sync In’ becomes
‘slaved’ to the other and will automatically follow the ‘master’ AM-77.
iii. Using a small flat blade screwdriver, move the ‘MODE’ switch (R5) to the right to select ‘MM’.
iv. Using a small flat blade screwdriver, move the ‘INT/POWER AMP’ switch (R4) to the right to select
‘INT AMP’.
v. Repeat this process for the other AM-77
vi. Power both AM-77s back on via the ‘POWER’ switch (R12).
45
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Figure 4.9 - Mode IV: Power Stereo amplifier
Speaker R
Speaker L
1
0
9
8
7
6
5
0
0
0
0
0
0
1
0
9
8
7
6
5
0
0
0
0
0
0
Sensitivity:
87dB
8Ohms
150W
Sensitivity:
87dB
8Ohms
150W
Impedance:
HF
Impedance:
HF
Cont. Power Handing:
Peak Prog. Handing:
Cont. Power Handing:
Peak Prog. Handing:
Level Adjustment
Resistor
Level Adjustment
Resistor
600W
600W
Frequency Response: (see graph)
Frequency Response: (see graph)
1
0
0
1
0
0
0
1
0
0
0
0
1
0
0
1
0
0
0
10000
F
requency
(
Hz
)
F
r
e
q
u
e
n
c
y
(Hz)
LS-77 Professional Monitor
Designed and Engineered in Great Britain
LS-77 Professional Monitor
Designed and Engineered in Great Britain
HF
LF
HF
LF
Pro
HiFi
IN
OUT
IN
OUT
Speaker Cable
Speaker Cable
Speaker
Output
Speaker
Output
Balanced
Input
Power
Mode
On
Off
_
_
+
+
Pro
HiFi
In
Out
-
-
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
1
2
3
4
5
Sync
Mode
R
L
L
M
L
R
M
M
IR Link
Option
R
M
L
R
M
M
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
CAUTION ATTENTION
RISQUE DE CHOC ELECTRIQUE
RISK OF ELECTRIC SHOCK
SERIAL NO.
!
DO NOT OPEN
NE PAS OUVRIR
AM-77
Interconnect Cable
Interconnect Cable
Power
Amp
Int
Amp
Analog
Outputs
Analog
Outputs
R
L
Pre-amplifier
Pre-amplifier
46
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i. Power OFF via the ‘POWER’ (R12) switch at the rear of the AM-77.
ii. Connect the desired separate pre-amplifier to the AM-77 via the Balanced or RCA female connector
of Input 1 (R6).
iii. Using a small flat blade screwdriver, move the ‘MODE’ switch (R5) to the centre to select ‘L R’.
iv. Using a small flat blade screwdriver, move the ‘INT/POWER AMP’ switch (R4) to the left to select
‘POWER AMP’.
v. Power the AM-77 back on via the ‘POWER’ switch (R12).
47
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Figure 4.9 - Mode V: Power Monoblock amplifier
Pro
HiFi
Speaker R
Speaker
L
Mode
M
L
R
M
M
1
0
9
8
7
6
5
0
0
0
0
0
0
1
0
9
8
5
0
0
0
0
0
0
S
e
n
s
e
i
t
i
v
i
t
y
:
8
7
d
B
S
e
n
s
e
i
t
i
v
i
t
y
:
87dB
I
m
p
d
a
n
c
e
:
8
O
1
h
m
s
W
W
HF
I
m
p
d
a
n
c
e
:
8
O
1
h
m
s
W
W
HF
C
P
o
n
t
.
P
o
w
e
r
H
a
n
d
d
i
n
g
g
:
5
0
0
0
p
C
P
o
n
t
.
P
o
w
e
r
H
a
n
d
d
i
n
g
g
:
5
0
0
0
p
Level Adjustment
Resistor
Level Adjustment
Resistor
e
a
k
P
r
o
g
.
H
a
n
i
n
n
:
6
e
a
k
P
r
o
g
.
H
a
n
i
n
n
:
6
F
r
e
q
u
e
n
c
y
R
e
s
p
o
s
e
:
(
s
e
e
g
r
a
h
)
F
r
e
q
u
e
n
c
y
R
e
s
p
o
s
e
:
(
s
e
e
g
r
a
h)
1
0
0
1
0
0
0
1
0
0
0
0
1
0
0
1
0
0
0
1
0
0
0
0
F
r
e
q
u
e
n
c
y
(
H
z
)
F
r
e
q
u
e
n
c
y
(
H
z
)
L
e
S
d
-
7
7
P
r
o
n
f
e
s
s
i
o
n
a
l
M
n
o
n
i
t
o
r
t
L
e
S
d
-
7
7
P
r
o
n
f
e
s
s
i
o
n
a
l
M
n
o
n
i
t
o
r
t
D
e
s
i
g
n
a
n
d
E
g
i
n
e
e
r
e
d
i
G
r
e
a
B
r
i
t
a
i
n
D
e
s
i
g
n
a
n
d
E
g
i
n
e
e
r
e
d
i
G
r
e
a
Britain
HF
HF
LF
LF
Power
Amp
Int
Amp
IN
OUT
IN
OUT
Speaker Cable
Speaker Cable
Speaker
Output
Speaker
Output
Speaker
Output
Speaker
Output
Balanced
Input
Balanced
Input
Power
Power
On
Off
On
Off
_
_
_
_
+
+
+
+
HiFi
Pro
HiFi
Pro
In
Out
In
Out
-
-
-
-
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
1
2
3
4
5
Sync
1
2
3
4
5
Sync
Mode
Mode
R
L
R
L
L
L
M
L
R
M
M
M
L
R
M
M
IR Link
IR Link
Option
R
R
Option
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
CAUTION ATTENTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
CAUTION ATTENTION
RISQUE DE CHOC ELECTRIQUE
RISK OF ELECTRIC SHOCK
DO NOT OPEN
NE PAS OUVRIR
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
SERIAL NO.
SERIAL NO.
!
!
AM-77: Master
AM-77: Slave
Analog
Outputs
Analog
Outputs
Interconnect Cable
Interconnect Cable
R
L
Pre-amplifier
Pre-amplifier
48
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Note: This function requires at least 2 x AM-77 synchronised pre-main amplifiers.
i. Power OFF via the ‘POWER’ (R12) switch at the rear of both AM-77s.
ii. Using a small flat blade screwdriver, move the ‘MODE’ switch (R5) to the left to select ‘M’.
iii. Using a small flat blade screwdriver, move the ‘INT/POWER AMP’ switch (R4) to the left to select
‘POWER AMP’.
iv. Repeat this process for the other AM-77.
v. Power ON both AM-77s via the respective ‘POWER’ switch (R12).
49
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Figure 5.0 - Mode VI: Power Bi-amplifier mode
Pro
HiFi
Speaker R
Speaker
L
Mode
M
L
R
M
M
1
0
9
8
7
6
5
0
0
0
0
0
0
1
0
9
8
7
6
5
0
0
0
0
0
0
S
e
n
s
e
i
t
i
v
i
t
y
:
8
7
d
B
S
e
n
s
e
i
t
i
v
i
t
y
:
87dB
I
m
p
d
a
n
c
e
:
8
O
1
h
m
s
W
W
HF
I
m
p
d
a
n
c
e
:
8
O
1
h
m
s
W
W
HF
C
P
o
n
t
.
P
o
w
e
r
H
a
n
d
d
i
n
g
g
:
5
0
0
0
p
C
P
o
n
t
.
P
o
w
e
r
H
a
n
d
d
i
n
g
g
:
5
0
0
0
p
Level Adjustment
Resistor
Level Adjustment
Resistor
e
a
k
P
r
o
g
.
H
a
n
i
n
n
:
6
e
a
k
P
r
o
g
.
H
a
n
i
n
n
:
6
F
r
e
q
u
e
n
c
y
R
e
s
p
o
s
e
:
(
s
e
e
g
r
a
h
)
F
r
e
q
u
e
n
c
y
R
e
s
p
o
s
e
:
(
s
e
e
g
r
a
h)
1
0
0
1
0
0
0
1
0
0
0
0
1
0
0
1
0
0
0
10000
F
r
e
q
u
e
n
c
y
(
H
z
)
F
r
e
q
u
e
n
c
y
(Hz)
L
e
S
d
-
7
7
P
r
o
n
f
e
s
s
i
o
n
a
l
M
n
o
n
i
t
o
r
t
L
e
S
d
-
7
7
P
r
o
n
f
e
s
s
i
o
n
a
l
M
n
o
n
i
t
o
r
t
D
e
s
i
g
n
a
n
d
E
g
i
n
e
e
r
e
d
i
G
r
e
a
B
r
i
t
a
i
n
D
e
s
i
g
n
a
n
d
E
g
i
n
e
e
r
e
d
i
G
r
e
a
Britain
HF
HF
LF
LF
Power
Amp
Int
Amp
IN
OUT
IN
OUT
Speaker Cable
Speaker Cable
Speaker Cable
Speaker Cable
Speaker
Output
Speaker
Output
Speaker
Output
Speaker
Output
Balanced
Input
Balanced
Input
Power
Power
On
Off
On
Off
_
_
_
_
+
+
+
+
Pro
Pro
HiFi
HiFi
In
Out
In
Out
-
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
-
-
-
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
1
2
3
4
5
Sync
1
2
3
4
5
Sync
Mode
Mode
R
L
R
L
L
L
M
L
R
M
M
M
L
R
M
M
IR Link
IR Link
Option
R
R
Option
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
CAUTION ATTENTION
CAUTION ATTENTION
RISQUE DE CHOC ELECTRIQUE
RISK OF ELECTRIC SHOCK
DO NOT OPEN
NE PAS OUVRIR
RISQUE DE CHOC ELECTRIQUE
RISK OF ELECTRIC SHOCK
SERIAL NO.
SERIAL NO.
!
!
DO NOT OPEN
NE PAS OUVRIR
AM-77: Master
AM-77: Slave
Analog
Outputs
Analog
Outputs
Interconnect Cable
Interconnect Cable
R
L
Pre-amplifier
Pre-amplifier
50
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Note: This function requires at least 2 x AM-77 synchronised pre-main amplifiers.
i. Power OFF via the ‘POWER’ (R12) switch at the rear of both AM-77s.
ii. Using a small flat blade screwdriver, move the ‘MODE’ switch (R5) to the right to select ‘MM’.
iii. Using a small flat blade screwdriver, move the ‘INT/POWER AMP’ switch (R4) to the left to select
‘POWER AMP’.
iv. Repeat this process for the other AM-77.
v. Power ON both AM-77s via the respective ‘POWER’ switch (R12).
51
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Section 5 - Additional Connectivity
5a. Input for iPod/other portable music players
When the 3.5mm
jack is used,
disconnect the
RCA connecion
to Input 4 at the
rear of theAM-77
Input 4
-
DUAL
MONO
-
AMPLIFIER
AM
7
7
On the front right-side panel, there is a 3.5mm jack (F4). This is for the connection of an iPod or any other
portable music device for music playback through this medium.
To select this source, change selection to Input 4 (disconnect any RCA connection to Input 4 at the rear).
The USB connection (F5) is purely for supplying power to the iPod/other portable music device. It serves no
other function.
53
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5b. ‘HiFi/Pro’ Switches for Balanced XLR inputs
Pro
HiFi
‘Pro’ switch is for
the few pre-
Speaker
Output
Speaker
Output
Balanced
Input
Power
Mode
On
Off
_
_
+
+
Pro
HiFi
In
Out
-
-
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
amplifiers that
have floating
transformer
1
2
3
4
5
Sync
Mode
R
L
L
M
L
R
M
M
IR Link
R
M
L
R
M
M
Option
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
No User Serviceable Components Inside.
For service,contact your Authorised
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
CAUTION ATTENTION
RISK OF ELECTRIC SHOCK
DO NOT OPEN
RISQUE DE CHOC ELECTRIQUE
NE PAS OUVRIR
SERIAL NO.
!
balanced outputs
AM-77
Power
Amp
Int
Amp
For the majority of sources, the HiFi/Pro switch (R3) is best left in the ‘HiFi’position. However, if the source has
a pro-audio style transformer balanced output, the HiFi/Pro switch needs to be set to ‘Pro’.
A transformer balanced output uses a floating secondary from an audio transformer: unlike electronic balanced
outputs of any description, the signal is NOT referenced to ground (Pin 1). For such (rather rare) equipment, the
‘Pro’ switch is engaged to short-scircuit Pins 1 & 3, thus establishing the ground connection.
54
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5c. RS232 ‘Options’ Connector
For future
upgrades
Speaker
Output
Speaker
Output
Balanced
Input
Power
On
Off
_
_
+
+
Pro
HiFi
In
Out
-
-
Dual Mono Amplifier AM 77
Designed and Engineered in Great Britain
1
2
3
4
5
Sync
Mode
R
L
L
M
L
R
M
M
IR Link
R
Option
Option
Power
Amp
Int
Amp
Inputs
～
AC IN
90V 135V
190V 260V
No User Serviceable Components Inside.
For service,contact your Authorised
Under normal operation,set all switches to
the default(bold)position.Please refer to
the instruction manual for further details.
CAUTION ATTENTION
RISQUE DE CHOC ELECTRIQUE
RISK OF ELECTRIC SHOCK
Dealer or Distributor.Any modifications to
this equipment will void all warranties.
SERIAL NO.
!
DO NOT OPEN
NE PAS OUVRIR
The RS232 ‘Options’connector port (R9) is for upgrading the functionality of theAM-77 in future. Contact your
localAMR distributor/dealer for more detailed instructions.
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Section 6 - Technical Features
The following section provides a brief explanation of the most salient technical features of the AM-77.
Circuit ‘X’® is AMR’s unique circuit: with NOS thermionic electron valves for voltage gain with a patent-
pending error-cancellation circuit for the Class A matched bipolar output power devices.
OptiGain® inherently outperforms all conventional types of volume controls. At low as well at high volumes,
the dynamic range is virtually unhindered to preserve every bit of minuscule information in the signal.
OptiOperation® modes offer unrivalled functionality and flexibility: one or moreAM-77s can be synchronised
to deliver the optimum level of quality and can be seamlessly integrated into home theatre setups.
OptiPower® supply circuit is completely free of regulators. This is an essential pre-cursor for subsequent
thermionic electron valve circuits operating with no negative feedback.
OptiMains® is truly one of a kind as it will detect, monitor and adjust if necessary, the incoming voltage to
ensure the correct voltage is always supplied to the relevant internal sub-sections.
OptiTrans®power supply transformers are advanced double C-Core types which sonically outclass traditional
EI and toroidal transformers.
OptiSeal® is the galvanic sealing of functional sections in the transformer and includes the use of separate
transformer windings to ensure that noise from one section does not contaminate adjacent sections in a full dual-
mono audio circuit design.
57
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Appendix - Troubleshooting
Figure A.1 Troubleshooting Guide
Symptom
Possible cause
Solution
With power ON
no power is registered
• poor/no power plug connection
at mains power point
• insert the power plug firmly into the AC
• blown fuse at mains plug
• check and change mains plug fuse
No sound
• incorrect audio cable connections
• incorrect amplifier operation
• connect the sources to the AM-77 correctly
• make sure that the input selector on the AM-77 is set to
the desired source
Strange ‘blast’ sound
• check speaker connectors are not
in contact with the chassis and
• adjust fitting between speaker and chassis connectors
and terminal. Ensure no contact between chassis and
spade terminals (no ‘short circuiting’)
Remote control does
not work
• remote control batteries have
expired
• replace 2 xAAAbatteries
• object obscuring remote sensor on • remove any objects directly in front of the AM-77
the AM-77, no ‘line of sight’
A ‘humming’ sound
can be heard
• loose cable connections
• re-attach the loose cables correctly
Front switches ‘jump’/ • static electricity
enter Standby
• ‘Touch’ the chassis prior to pressing a sensor to dis
charge. Then press the desired sensor
Other problems
• go to the Contents section and re-trace the procedure
or contact your nearest AMR distributor/dealer
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Specifications
Figure S.1 - Specifications Table
Inputs:
5xRCA
1 x XLR Bal. shared with 1 RCA
1 x iPod® shared with 1 RCA
Volume Control:
-71dB – 0dB in 1dB steps + Mute
< 0.05V / > 20KOhm
Input Sensitivity (IHF 2.83V Out)/Impedance:
Power Output (see Notes)
IHF Dynamic Power:
270 watts per channel at 4 or 8 ohm (stereo mode)
330 watts per channel at 8 ohm (monoblock mode)
480 watts per channel at 2 or 4 ohm (monoblock mode)
180 watts per channel at 4 or 8 ohm (stereo mode)
220 watts per channel at 8 ohm (monoblock mode)
320 watts per channel at 2 or 4 ohm (monoblock mode)
FTC:
Output impedance:
0.5 ohm, 20 - 20,000 Hz
10Hz-50kHz
Frequency Response (-1dB):
Signal-to-noise ratio 'A' weighted:
Operational Modes:
>100 dB
Pre-Main amplifier mode
Power amplifier mode
59
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...continued
Monoblock option
An unlimited number of AM-77s can synchronised
Thermionic Electron Valves
Power Transformer:
5687/6900 (NOS): amplification stage
1200 VACustom Double C-Core
Power consumption:
Standby: 50 W
Power on: 95 W
at rated output (4R): 1000 W
Power Supply Capacitance:
Rated voltage:
Colour:
96,000uF in total
90V-135V&190V-260VAC
Champagne or Titanium
Dimensions:
17.9in W by 6.2in H by 18.3in D
46cm W by 16cm H by 47cm D
62 cm W by 30cm H by 78cm D (shipped)
Weight:
AM-77: 75 lbs/ 34 kg
Shipped: 121 lbs/ 55 kg
Information and specifications subject to change without notice.
60
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Notes
At AMR we feel that the IHF standard represents the best available rigidly mandated and standardised, musically relevant measurements
applicable today (in preference to DIN45500 among others) despite their formidable age and our wish for something more up-to-date, while
the FTC mandated standard is applicable under like-for-like ‘fair trade descriptions’ requirements in the USA (but we feel what is fair in the USA
is still fair elsewhere) to make sure that one maker’s advertised ‘watt’ is like-for-like equal to that of another. As a result we feature IHF-based
specifications and measurements where possible and FTC where mandated/appropriate.
i. FTC: Federal Trade Commission (USA)
Federal Trade Commission: a US-based trade standard body whose standardised measurement procedures (2000 revision) we apply where we
would be required to do so under US Law, even though we are UK-based. Past the FTC ruling (originally from 1974, updated in 2003) derived
rating there is a secondary power rating, the IHF ‘Dynamic Power’ (also defined in the mid 70’s) which is the maximum power the amplifier
can put out for a burst 20ms long, or in other words for a short musical peak. An amplifier that can deliver 200W for 20ms but 50W
continuously will have a FTC Power Rating of 50W but an IHF Dynamic Power Rating of 200W. An amplifier that can deliver 200W for 2ms
but 150W continuously will have a FTC Power Rating of 150W but an IHF Dynamic Power Rating of 200W. However, the available
undistorted peak output with music signals is actually the same for both Amplifiers.
ii. IHF: Institute of High Fidelity
Institute of High Fidelity: a US-based standard body (now incorporated into the International Electrotechnical Commission) whose standardised
measurements we usually apply. The Federal Trade Commission defines the information about an amplifier that a US manufacturer (or
distributor) must provide. FTC ratings derive from test data, and state an amplifier’s continuous average output capability into a defined load
across a defined frequency range (usually 20Hz - 20kHz, but any range can be used as long as it is stated). Also, the amplifier is tested with ‘both
channels driven’ (placing maximum strain on the power supply), so the test demonstrates its capacity in real-world conditions. This allows like-
for-like comparison of amplifiers that use FTC ratings. For that reason, you won’t find any published FTC ratings for an amplifier’s output into
a 2 Ohm load.
Abbingdon Music Research is a subsidiary of the Abbingdon Global Group
22 Notting Hill Gate; London; W11 3JE; United Kingdom;
Tel: +44 (0) 870 420 5505; Fax: +44 (0) 700 596 1065
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