Bogen MO100A User manual

MODEL
МОТООА
100 WATT
PUBLIC ADDRESS
BOOSTER AMPLIFIER
LEAR SIEGLER, INC. (5) ®
BOGEN DIVISION
P.O, BOX 500
PARAMUS, N. J, 07652
INSTALLATION AND OPERATING MANUAL
READ
THOROUGHLY
BEFORE
OPERATING
EQUIPMENT

DESCRIPTION
The
Bogen
MO100A
is
an
excellent
booster
am-
plifier capable
of delivering
100 watts of audio power.
It is ideal for installation
with sound systems
in in-
dustrial
plants,
stadiums,
theaters
and auditoriums.
This high quality
amplifier
has exceptional
power
handling
ability over the entire range of audio frequen-
cies.
The
MO100A
has
provisions
for
high
and
low
impedance
inputs.
Balanced-isolated
speaker
output
impedance
of
16
ohms
is
provided
as
well
as
25
volt
(60)
С.Т.
balanced,
70
volt
(490)
С.Т.
and
115
volt
constant
voltage
sources,
to eliminate
difficulties
encounteredin
speaker
matching
when unequal
amounts
POWER OUTPUT: 100 Watts
HARMONIC DISTORTION: Less than 2% at 100
watts output.
FREQUENCY
RESPONSE:
+
2
db,
8
to
50,000
cps.
HUM: 80 db below rated output.
SENSITIVITY
(for
rated
output):
High
impedance
input:
better
than
2
volts;
Low
im-
pedance
(using
TL600
transform-
er):
better
than
0.5
volt.
SPECIFICATIONS
.
of
power
are
required
for
different
speakers
of
a
dis-
tribution
system.
Sockets
are
provided
on
the
chassis
for
power
to
an
extemal
preamplifier
and
for
connec-
tion
of
a
model
KR6
remote
standby
power
control
unit.
Two
or
more
MO100A
booster
amplifiers
may
be
connected
in
parallel
for
installations
requiring
more
than
100
watts
of
power.
This
is
made
possible
by
interconnecting
the
“C.P.”
jacks
of
the
units
and
paralleling
the
inputs
and
outputs
of
the
units.
The
“C.P.”
connections
tie
the
feedback
components
of
the
amplifier
together,
thereby
balancing
their
char-
acteristics.
INPUTS:
High
impedance:
0.5
megohms;
Low
im-
pedance:
500/600
ohms
(balanced)
using
TL600
transformer;
bridging:
10,000
ohms
using
TL10K
transformer.
OUTPUTS:
16
ohms
balanced,
25
volt
C.T.
bal-
anced (6.250), 70 volt С.Т. balanced
(490) and 115 volt output (for indus-
trial applications.)
POWER
REQUIREMENTS:
250
Watts
(2.5
amps
at
117
volts)
50-60
cy-
cles
AC (for
P.A.
ap-
plications).
TUBES:
7247,
8417
(4),
3
silicon
rectifiers.
DIMENSIONS:
8?’
wide,
13”
deep,
64?
high.
WEIGHT:
33
lbs.
INSTALLATION
INPUT CONNECTIONS
High impedance: The amplifier can be driven to
full output, using the high impedance input, from any
preamplifier capable of developing 2.0 volts across a
500,000 ohm load. Connect the preamplifier output to
the HI Z phono type receptacle on the rear of the
amplifier.
Low
impedance:
The
amplifier
can
be
driven
to
full
output,
using
the
low
impedance
input
(model
TL600
input
transformer),
from
any
preamplifier
cap-
able
of developing
0.5
volts
across
a 500
ohm
load.
Plug the Bogen TL600 transformer into the X1
socket on top of the MO100A chassis. Connect the
-2-
500/600
ohm
input
to
the
LO
Z
terminals
оп
Ше
геаг
of
the
amplifier.
Bridging
Input:
The
amplifier
will
accept
a
bridg-
ing
input
at
10,000
ohms
by
utilizing
the
Bogen
TL10K
is
plugged
into
the
X1
socket,
and
the
bridging
input
is
connected
to
the
LO
Z
terminals
on
the
rear
of
the
amplifier.
Obtaining
signal
from
output
of
other
power
ampli-
fier:
For
amplifiers
with
a
70
volt
output
tap,
the
fol-
lowing
circuit
is
recommended
to
deliver
the
signal
re-
quired
to
drive
the
HI
Zinput
receptacle
of
the
MO100A.

TO HIGH
IMPEDANCE
OUTPUT
TERMINAL
INPUT
OF
STRIP_OF
POWER
ORIVER
AMPLIFIER
AMPLIFIER
74-0738-А
АТ ТОУ БІ = IOK, 1/2 W
АТ 25V RI = 3300N,1/2W
Figure 1 — Input Circuit
NOTE:
The
network
above
is
in
addition
to
the
normal
load
(loudspeakers,
etc.)
on
the
output
of
the
driver
amplifier.
OUTPUT
An
output
impedance
of
16
ohms
as
well
as
con-
stant
voltage
lines
of 115,
70 and
25 volts
have
been
provided
to meet
speaker
and
distribution
line
match-
ing.
For
16 ohms
connect
leads
to 16 ohm
terminal
and
COM
1.
For
70-volt
operation
connect
leads
to
70V
(49
0)
terminal
and
COM
2
terminal
and
connect
short-
ing
wire
from
COM
2
terminal
to
GND
if
grounding
is
desired.
For
70-volt
balanced
operation
remove
shorting
wire
between
COM
2 terminal
and
GND
and
connect
leads
from
70V
(490)
to
COM
2.
For
25
volt
operation
connect
leads
between
25V
(60)
terminal
and
COM
1;
for balanced
25 volt
operation
remove
shorting
link
be-
tween
COM
1 and
GND.
For
115
volt
operation
use
Jones
plug
#
P-302-CCT
and
class
1
wiring.
CONNECTIONS
BETWEEN
COMPONENTS
Use single-conductor, low capacity shielded wire
for connecting preamplifier to amplifier. Keep leads
under ten feet in length (unless cathode follower output
is employed).
II7V-50/60rJ
2)
2.5АМР 32А SLO-BLO
_©
II5V
об
даедваво
GND сом г5уст 25V ва сом тоуст том
49 n.
Speakers
may
be
connected
with
standard
flexible
line
cord
(‘‘zip-cord’’)
and
up
to
100
feet
of
cable
may
be
used
without
appreciable
loss.
Make
certain
that
all
audio
cables
are
kept
away
from
speaker
cables,
power
cables,
and
power
trans-
formers,
and
that
speaker
cables
are
kept
away
from
power
cables.
POWER
AND
GROUNDING
The
amplifier
is
furnished
with
an
AC
line
cord
terminated
in
a
three-prong
plug.
Plug
the
line
cord
into
a
three-wire
grounded
outlet
providing
a
nominal
120-volt,
50-60
cycle
power
source.
This
will
ground
the
amplifier
as
well
as
supply
power
to
it.
It
is
advisable
to
ground
the
amplifier.
Therefore,
if
a
three-wire
outlet
is
not
available,
an
adapter
such
as
Leviton
No.
5017
should
be
used
to
convert
a
standard
two-wire
outlet
for
use
with
three-wire
plugs.
The
adapter
is
provided
with
a
grounding
pigtail
which
should
be
connected
to
the
screw
holding
the
wall
plate
to
the
receptacle.
NOTE
In
some
areas,
the
wall
plate
screw
is
not
grounded.
In
this
case
it
will
be
necessary
to
connect
a
grounding
wire
between
the
GND
terminal
on
the
rear
chassis
of
the
amplifier
and
a
water
or
steam
pipe.
AUXILIARY POWER
The
auxiliary
power
receptacle
located
on
the
top
chassis
is
a
three-wire
grounded
outlet.
Hence,
апу
associated
equipment
connected
to
it
with
a
three-
prong
line
cord
will
be
grounded,
providing
the
ampli-
fier
or
preamp
power
switch
and
the
phono
on-off
switch
must
be
used
in
turning
off
a
record
player
connected
to
the
auxiliary
receptacle.
Flats
may
develop
on
the
idler
wheel
of
the
phonograph
if
only
the
amplifier
power
switch
is
used
to
stop
the
record
player.
VOL
HI
2
Teo
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BAL]
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B74-0740
MAC 02—
Figure
2
—
MO100A
Rear
Panel

PARALLELING ANPLIFIERS
Dual High Impedance Input and C.P. (cathode
paralleling) receptacles are provided to facilitate
paralleling
of
amplifiers
without
wiring.
When
paral-
leling
amplifiers
interconnect
the
units
as
shown
in
figure
4,
Any
number
of
units
may
be
parallelled
to
provide
the
desired
output
power.
The
interconnecting
cable
for
the
“High
Z’’
and
“C.P.”
receptacles
should
be
standard
audio
shielded
cable
with
phono
type
plugs
at
both
ends.
NOTE:
Only
transformer
taps
of
the
same
output
impedance
should
be
paralleled.
It
must
be
borne
in
mind
that
paralleling
outputs
reduces
the
output
im-
редапсе.
Ве certain that each SPEECH-MUSIC switch is in
the same position on all amplifiers. Rotate all VOLUME
controls to maximum gain position. When it is desired
to reduce the volume, each amplifier’s VOLUME con-
trol should be set to achieve exactly equal gain for
all amplifiers. Preferably, a common resistance loss
circuit should be installed.
The
70
volt
outputs
of
two
or
more
МО100А
units
may
be
connected
in
series
to
provide
a
140
volt
out-
put
for
two
amplifiers
or
210
volts
for
three
units.
To
install
a
series
hookup
connect
the
70
volt
outputs
as
shown
in
figure
3.
The
HI
Z
and
C.P.
outputs
are
paralleled as described above and as shown in figure 4,
CAUTION
—
READ
CAREFULLY
The
high
output
and
sensitivity
of
the
model
MXM-A
preamplifier
makes
it
possible
to
parallel
up
to
three
units
with
the
MO100A
booster,
to
pro-
vide
a
total
of
15
available
microphone
inputs.
However,
the
overall
system
gain
should
be
ad-
justed
when
only
one
MXM-A
preamp
is
used
to
drive
the
MO100A
amplifier.
Adjust
the
Volume
control
on
the
booster
amplifier
to
provide
a
high-
impedance
booster
sensitivity
of
20
volts
for
full
output
or a sensitivity
of about
4volts
for 500/600
ohm
input.
This
is accomplished
by turning
the
Volume
control
approximately
one-quarter
turn
clockwise
from
the
off position
and
setting
the
Master
Gain
control
on
the
МХМ-А
to
about
“6”
position.
When
the amplifier
and
preamp
level
con-
trols
have
been
adjusted
as described
above,
all
input
channels
will
have
more
than
sufficient
sensitivity.
In addition,
these
settings
will
elimi-
nate
unnecessary
and
excessive
system
gain,
hum,
noise
and
possible
oscillation.
STANDBY CONTROL UNIT
Model
KR-6
standby
control
unit,
which
permits
control
of the
amplifier
from
a remote
location,
is
available
as
an
accessory
unit.
The
KR-6
cable
can
be
plugged
in
on
top
of
the
chassis
of
the
МО100А
unit
(a
separate
instruction
sheet
is
furnished
with
the
unit).
Control
leads
from
this
relay
can
be
run
to
any
desired
point.
By
means
of
a
control
switch
these
leads
can
be shorted,
placing
the
amplifier
in a ready-
to-operate
condition.
When
the
switch
is
open,
the
amplifier
is
placed
in
a
standby
condition.
In
standby,
the
filaments
of
the
amplifier
tubes
are
heated,
but
screen
voltage
and
plate
current
is
removed,
reducing
power
consumption
and
extending
the
lite
of
the
tubes.
An
8-prong
shorting
plug,
inserted
into
the
STAND-
BY
CONTROLLER
SOCKET,
is
fumished
with
the
MOLOOA.
When
the
relay
is
installed,
this
plug
should
be
removed
and
the
8-prong
plug
furnished
with
the
relay
inserted
into
the
socket.
The
length
of
control
cable
which
can
be
used
between
the
remote
switch
and
the
KR-6
unit
is
limited
only
by
the
DC
resistance
of
the
control
leads.
The
total
length
of
control
cable
used,
therefore,
should
not exceed
the following:
#22 AWG wire — 45 feet
#18 AWG wire — 120 feet
#14 AWG wire — 300 feet
#12
AWG
wire
—
450
feet.
210V
TOTAL
300 WATTS
| | 74-0842-А
Figure
3
—
Series
Hookup
of
70-Volt
Outputs
OPERATION
Although
the
MO100A
incorporates
an
ON-OFF
switch,
it
is
advantageous
to
control
the
unit
from
the
preamplifier.
In
this
way
the
MO100A
will
be
switched
on and off together with the preamplifier, thereby
simplifying operation. The power cord of the MO100A
should therefore be inserted into the controlled Auxil-

TO SPEAKER SYSTEM
AMPLIFIER
AMPLIFIER
(900090)
74-0401 В
AMPLIFIER
HI z ye all ШЕШЕ OUTPUT
FROM
OT P PREAMP
HI Z INPUT
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Figure
4
—
Paralleling
Amplifiers
iary Power receptacle of the preamplifier, which is
controlled by the ши з ON-OFF switch.
If
the
MO100A
cannot
be
controlled
from
the
pre-
amplifier
unit then the ON-OFF
switch
on Ше МО100А
should
be used to turn it ON and OFF.
The
volume
control
on
the
МО100А
is
used
to
compensate
for a great variation
in preamplifier
output
levels.
Thus, if the preamplifier
output
is very high,
the user will find that it is necessary
to operate
the
preamplifier’s
volume
control
near minimum
to prevent
‘blasting’?
volume
output
from the speaker
system.
Conversely,
if the preamplifier
output
is low, the
preamplifier’s
volume
control
may have to be operated
near maximum
to achieve
sufficient
volume.
The
volume
control
on the MO100A
thus permits
the user
=$ =
to
adjust
the
gain
of
the
MO100A
so
that
the
pream-
plifier's
volume
control
is
operated
in
its
mid-range
to
achieve
the
desired
volume
level
range.
This
control
need
be
set
only
once,
on
installation
(therefore
it
is
a
screwdriver
adjustment).
The
SPEECH-MUSIC
switch,
located
on
top
of
the
chassis,
is
used
to
provide
optimum
response
for
speech
when
placed
in
speech
position.
The
Input
Terminal
switch
located
on
top
of
the
chassis,
is
used
for
switching
between
high
impedance
and
low
impedance
inputs
on
the
input
terminals.
When
low
impedance
input
is
desired
the
proper
impedance
matching
transformers
(TL600
or
TL10K)
should
be
plugged
into
socket
X1
and
the
switch
placed
in
LO
Z
position.

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SERIES
LEAR
SIEGLER.INC.
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BOGEN
COMMUNICATION
DIVISION
PARAMUS.N.J. MADE INU.S.A,
ст4-0741
Figure
5
-
Тор
View
of
Chassis
MAINTENANCE
PILOT LIGHT REPLACEMENT
The
pilot
light
is
located
in
a
holder
behind
a
jewel
on the
front
panel.
To replace
bulb,
first
remove
eight
self
tapping
screws
holding
chassis
bottom
plate.
Press
bulb
in and
rotate
counterclockwise
slightly.
The
bulb
will
then
spring
free.
Use
only
a
#47
bulb
for replacement.
FUSE REPLACEMENT
A 3,2 ampere slow-blow fuse is located on the
rear of the chassis. To replace fuse press the spring-
loaded cap slightly inward and withdraw cap and fuse.
Use only a fuse of the same rating for replacement. If
a second fuse blows, do not attempt to further operate
the equipment. Consult an experienced technician or
Bogen representative for inspection of the unit.
BALANCING OUTPUT TUBES
If any of the four output tubes are replaced, bal-
ance
tubes
as
follows:
1, Connect a dummy load across amplifier output,
which is capable of handling full rated power output.
In addition connect an AC УТУМ and an oscilloscope
across dummy load.
2. Feed a 1,000 cycle signal into the HI Z input
and adjust signal level (to point where clipping occurs)
to provide slightly over full rated output of amplifier
as measured with AC VTVM.
3. BALANCE ADJUSTMENT is located on top
of chassis adjacent to output tubes. This control is a
screwdriver adjustment. Rotate control to position
which
provides
equal
clipping
on
oscilloscope.
NOTE:
If
a
distortion
analyzer
is
available,
this
should
be
used
in
preference
to
oscilloscope.
In
this
case,
a
distortion
reading
of
approximately
1
percent
should
be
measured
at
full
output
provided
everything
else
in
amplifier
is
operating
properly.
For
field
service,
where
test
equipment
is
not
available,
set
balance
control
to
approximately
center
position.
BOGEN SERVICE
We
are
interested
in
your
Bogen
unit
for
as
long
as
you
have
it.
If
trouble
ever
develops
with
your
unit,
please
do
not
hesitate
to
ask
our
advice
or
assistance.
Information
can be
obtained
by
writing
to:
Service
De-
partment,
Bogen,
P.
O.
Box
500,
Paramus,
New
Jersey.
When
communicating
with
us
give
the
model
number
and
serial
number
of
your
unit.
Completely
describe
the
difficulty
encountered.
Describe
the
effects
each
oper-
ating
control
has
upon
the
symptoms
of
trouble.
Include
details
on
electrical
connections
to
associated
equip-
ment
and
list
such
equipment.
When
we
receive
this
information
we
will
send
you
service
information
if
the
trouble
gppears
to
be
simple
(e.g.
bad
vacuum
tube,
incorrect
connections).
If
trou-
ble
requires
servicing,
we
shall
send
you
the
name
and
address
of
the
nearest
Bogen
authorized
service
agency
to
which
you
can
send
your
unit
for
repair.
When
shipping
your
unit,
pack
instrument
well
using
the
equivalent
of
the
original
shipping
carton
and
filler
material
to
prevent
damage
in
transit.
Send
unit,
fully
insured
and
prepaid,
via
railway
express.
Do
not
ship
via
parcel
post
unless
so
instructed.
The
unit
will
be
promptly
repaired
and
returned
to
you
via
express
prepaid.

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NOTES
UNLESS OTHERWISE SPECIFIEO -
1. ALL RESISTORS ARE 1/2 WATT, +0%.
2. ALL CAPACITORS IN WHOLE NUMBERS ARE IN ММЕО.
THOSE IN DECIMALS VALUES ARE IN MFO.
®. ALL VOLTAGES ARE D.C. MEASURED WITH А 20,000 A PER
VOLT METER, AND MAY VARY +20%
4 (СР-САТНООЕ PARALLELING) IF TWO OR MORE МО!ООА'5 ARE
TO BE PARALLELED TO OBTAIN HIGHER OUTPUT, THE INPUTS
AND OUTPUTS ARE ТО ВЕ CONNECTED AND ALL СР CONNECTORS
HWE TO ВЕ PARALLELED BY MEANS OF SHIELDED PATCHCORDS.
RED
SHORTING
PLUG
45-9306-01
Е74-0701-02
(ISSUE8, RUN R |
Figure 6 — Model MO100A Schematic Diagram

REPLACEMENT
PARTS
The
components
used
in
Bogen
equipment,
with
When
ordering
a
part,
specify
part
number
and
exception
of
items
listed
below,
are
standard
parts
description
of
the
part
as
listed
below.
Specify
the
through
all
reputable
parts
jobbers.
However,
several
model
and
give
the
series
designation,
which
is
a
run
parts
are
custom-made
to
strict
Bogen
specifications
letter
followed
by
numbers,
stamped
or
screened
on
the
and
should
be
replaced
only
with
genuine
Bogen
tear
of
the
chassis.
Also,
give
the
component
board
parts.
These
custom-made
parts
are
listed
here
and
assembly
number
(45—)
for
all
parts
mounted
on
PC
аге
available
through
Bogen
distributors,
service
boards.
agencies
or
direct
from
the
factory.
Ref. No. PartNo. Description Ref. No. Part No. Description
C8 79-005-052 Capacitor, Electrolytic, R9 75-235-223 Resistor, 22K, ‘AW, 2%
500Mfd, 25V R10 75-235-223 Resistor, 22K, ИМ, 2%
c9
79-010-046
Capacitor,
Electrolytic,
R15
77-001-563
Control,
Balance,
Screw
100Mfd, 450V Driver Adjust
C10 79-0 10-046 Capacitor, Electrolytic, R22 75-235-563 Resistor, 56K, ИМ, 2%
100Mfd, 450V R24 75-653-223 Resistor, 22K, 5W, 5%
Cll 79-010-047 Capacitor, Electrolytic, R25 75-235-332 Resistor, 3.3K, ИМ, 2%
10-100Mfd,
400V
R26
75-235-103
Resistor,
10K,
УМ,
2%
CRI, 2 96-5195-01 Diode, Rectifier R27 75-742-511 Resistor, 510 ohms,
CR3
96-5109-01
Diode,
Silicon,
150
shot
W.W.
РТУ.
R28
76-101-114
Resistor,
6.8
ohms,
R1 77-001-275 Control, Volume, Screw AW, W.W.
Driver
Adjust
TA
83-670-000
Transformer,
Power
R2 75:235-.122 Resistor, 1.2K, УМ, 2% 13 83-349-000 Transformer, Output
R7 75-235-223 Resistor, 22K, ИМ, 2% 45-9306-01 Plug, Shorting
OWNER'S WARRANTY
Bogen
solid
state
sound
equipment
is
guaranteed
against
defects
in
material
and
workmanship
for
one
year
from
the
date
of
sale
to
the
original
purchaser,
provided
that
the
equipment
has
not
been
subjected
to
abuse
or
accident
or
altered
in
any
way.
Any
part
of
the
equipment
covered
by
this
warranty
which,
with
normal
installation
and
use,
becomes
defective
will
be
repaired
or
replaced
by
Bogen,
provided
the
equip-
ment
is
delivered
or
shipped
prepaid
and
insured
to
our
authorized
service
station
or
to
the
Bogen
Factory
Service
Department,
Route
4
and
Forest
Avenue,
Paramus,
New
Jersey
07652.
The
equipment
may
be
picked
up
by
you
personally
or
will
be
returned
to
you
freight
prepaid.
Models
containing
vacuum
tubes
carry
the
same
warranty
as
above,
except
that
it
does
not
apply
to
the
vacuum
tubes,
which
are
guaranteed
for
90
days.
The
registration
card
enclosed
with
the
equipment
must
be
completed
and
mailed
within
five
days
of
pur-
chase to place the warranty in effect.
PRINTED
IN
U.S.A.
54-5253-05
12-72 В