McCURDY ADA-700 User manual

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ADA-700
AUDIO
DISTRIBUTION
AMPLIFIER
User's
Manual

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ADA-700
AUDIO
DISTRIBUTION
AMPLIFIER
User's
Manual
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McCurdy Radio Industries
Limited
108
Carnforth
Road, Toronto, Ontario, Canada M4A 2L4
Tel: [phone] / Fax: [phone]
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NOTICE
Mccurdy
Radio
Industries
reserves
the
right,
without
notice
to
make
such
changes
in
equipment,
design,
specifications,
or
components
as
progress
in
engineering
or
manufacturing
techniques
may
warrant
to
improve
the
performance
of
the
product.
The
proprietary
data,
information,
and
drawings
furnished
in
this
document
shall
not
be
disclosed
outside
the
org-
anization
to
which
it
is
submitted.
Duplication
of
this
document
by
any
means
in
whole
or
in
part,
for
use
in
any
manner
not
expressly
intended
by
this
release,
is
strictly
prohibited.
August,1987
Copyright
1987
Mccurdy
Radio
Industries
Limited.
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Page
i
PREFACE
Warranty
Inquiries
ADA-700
Audio
Distribution
Amplifier
Mccurdy
Radio
Industries
Limited
warrants
to
the
original
purchaser,
that
this
product
is
free
from
defects
in
materials
and
workmanship,
under
normal
use,
for
a
period
of
one
year
from
the
date
of
shipment.
In
the
event
that
Mccurdy
Radio
Industries
Limited
determines,
in
its
sole
discretion,
that
the
product
is
defective
within
the
warranty
period--
and
provided
that
the
purchaser
returns
the
product,
properly
packaged
and
freight
prepaid,
to
a
designated
Mccurdy
Radio
Industries
Limited
service
and
repair
facility--McCurdy
will,
at
its
option,
repair
or
replace
the
product.
The
repaired
product
will
be
returned
(F.O.B.
Toronto),
as
directed
by
the
customer.
No
warranty
is
implied
or
expressed
as
to
the
suitability
of
this
product
for
a
particular
usage
and
Mccurdy
Radio
Industries
Limited
is
not
liable
for
any
consequential
damages
however
caused.
All
inquiries
regarding
discrepancies
in
equipment
received,
service
under
warranty,
or
procurement
of
replacement
parts,
should
be
addressed
to:
Mccurdy
Radio
Industries
Limited
108
Carnforth
Road,
Toronto,
Ontario,
Canada
M4A
2L4
Telephone:
(416)
751-6262,
or
(212)
772-0719
Telex:
06-963533
Facsimile:
(416)
751-6455

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ADA-700
Audio
Distribution
Amplifier
Page
ii
Safety
Summary
Power
source
This
equipment
is
designed
to
operate
from
either
a
117
V
or
220
V
AC
50/60
Hz
power
source.
Grounding
This
product
is
grounded
through
the
grounding
pin
of
the
line
cord
.
To
avoid
electrical
shock,
plug
the
line
cord
into
a
properly
wired
receptacle
before
making
any
input
or
output
connections
with
other
devices.
A
protective
ground
connection,
by
way
of
the
grounding
conductor
of
the
line
cord,
is
essential
for
safe
operation.
Power
·
line
cord
Use
only
the
line
cord
and
connector
specified
for
your
unit.
Ensure
that
the
line
cord
is
in
good
condition
and
free
of
kinks.
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Page iii
ADA-700 Audio Distribution Amplifier
ADA-700 AUDIO DISTRIBUTION AMPLIFIER
TABLE OF CONTENTS
PREFACE
Warranty . . .
Safety Summary
TABLE OF CONTENTS.
LIST OF DRAWINGS ...
DESCRIPTION .....
Audio Functional
SPECIFICATIONS .
INSTALLATION . . . . . . . . . . . . .
Unpacking . . . . . . . . . . . . . .
Preparation ............ .
REAR-PANEL
..••.
Connections.
Power Connection
INDEX
SCHEMATICS •.
i
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ii
iii
iv
1
2
3
5
5
5
6
7
9
10
11

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ADA-700 Audio Distribution Amplifier
LIST OF ILLUSTRATIONS AND DRAWINGS
TITLE
Audio Functional
Rear Panel Layout
In/Term Connector
Output 1-4 Connector
Output 5-8 Connector
System/Chassis Ground Connector
Rear Panel Line Voltage Switch
and Fuseholder
Audio Schematic
Power Supply Schematic
Component layout
Assembly Drawing
External Component Assembly
Page
DRAWING NUMBER
Figure 1
Figure
2
Figure 3
Figure 4
Figure 5
Figure 6
Figure 7
D-ADA-700/2-1
C-ADA-700/2-2
D-ADA-700/8-1
D-ADA-700/8-2
D-ADA-700/8-3
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11
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14
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Page
1 ADA-700
Audio
Distribution
Amplifier
ADA-700
AUDIO
DISTRIBUTION AMPLIFIER
DESCRIPTION
A
rugged
and
reliable
performer,
the
Mccurdy
ADA-700
consists
of
two,
independent,
distribution
amplifiers
and
a
self-contained
power
supply
within
a
sturdy
housing.
The
compact
housing,
of
standard
width,
requires
only
one
unit
of
rack
height.
The
distribution
amplifier,
for
custom
applications
in
broadcast
and
professional
audio
equipment,
is
almost
noise-
and
distortion-free.
In
stereo
service,
ADA-700
supplies
amplified
power
to
eight
outputs.
Each
output
can
be
individually
adjusted
by
the
convenient
front-
panel
controls
within
a
range
of
34
dB.
The
space
and
power
requirements
for
the
ADA-700
are
minimal.
The
unit,
only
1.75"
high
fits
a
standard
19''
(483
mm)
rack.
An
AC
power-entry
module,
with
a
built-in
fuse
and
voltage
selector
switch,
can
be
easily
switched
to
either
117
V, 60Hz
or
220
V,
50Hz
service.
The
compact
ADA-700
has
other
features;
these,
apparent
only
to
those
who
have
reason
to
examine
the
interior
of
the
unit,
include;
1
Reg'd
TM.
o
miniaturized,
solid-state
circuitry.
The
circuitry
is
assembled
on
a
high-quality,
glass
epoxy
printed
circuit
board.
o
quiet,
toroidal-transformer
power
supply,
o
reliable,
Molex
"Mini-fit"
Jr(
1
)connectors,
o
150/600
ohm
input
termination
that,
by
means
of
jumpers,
can
be
readily
inserted.

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ADA-700 Audio Distribution Amplifier
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-6 T0+30
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INPUTS -22TO +14dllu
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>--------~
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I (RIGHT)
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P'OR 600.J'\. TlaRMINATION I I
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J , < I SHIELD
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L - __ ...J
•J~R
PLUG
;-- --7
li
! t~<! !
I I I
I n :
SYSTlaM GROUND
l <l : (AUDIO COM)
i :~
L - - ~CHASSIS GROUND
ICITES
• JUMPER PLUG MUST BE
REMOIIED IIEFOflE CONNECTING
STATION TlaCHNICAL GND TO
PINS 3,S,I .
•• CONNECTING 3-6 AND 1-4
PROVIDES 150.J'\. TERMINATION
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:r2
>-----------., 3, 9
~--------,--- 4,10
;--------,----,!'> 6, 12
rll
!..: ____ ~
r-J~w21-1
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>---------,---,o, 3,9
---ii 7 >---------,----:ii) 4, 10
•10 TO +30
~--II' I>---------,-----;• 6,12
lrll
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Fig.1 ADA-700 AUDIO FUNCTIONAL
Page 2
OUTPUTS
+B4Bu
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Page
3 ADA-700
Audio
Distribution
Amplifier
SPECIFICATIONS
Amplifiers
Two;
in
stereo
service,
they
are
used
to
drive
eight
outputs
from
one
input.
Input
level
-22
to
+14
dBu
nominal
for
+8
dBm
output.
Maximum
+28
dBu.
Input
impedance
Output
level
Output
source
impedance
Output
isolation
Output
de
offset
Gain
adjustment
>20
K
ohms
active,
balanced.
+28
dBm,
maximum;
600
ohm
(minimum)
terminated
outputs.
60
ohm,
active
balanced.
>80
dB, 20
Hz
to
20
kHz.
<±50
mv
Each
output
split
can
be
adjusted
independently
within
a
range
of
34
dB.
Frequency
response
+0,-0.2dB,
20
Hz
to
20
kHz.
Noise
Total
harmonic
distortion
Inter-modulation
distortion
124
dB
below
maximum
output
at
unity
gain.
20
Hz
to
30
kHz.
",
Nominally
114dB
below
+18dBu
terminated
(600
ohm)
output
unity
gain
(20
Hz
to
30
KHz)
Typically
104
dB
below
+8dBm
<0.01%
(20
Hz
to
20
kHz)
at
unity
gain.
Up
to
+28
output
level
with
600
ohm
outputs.
<0.008%
at
unity
gain.
Up
to
+28dBm
output
level
600
ohms
terminated
(4:1
ratio)
Typically
<0.001%
at
+8 dBm.