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

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

[z

BAL]

o

@@@о

GND

НЕ

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

(900090)

74-0401

В

AMPLIFIER

HI

z

ye

all

ШЕШЕ

OUTPUT

FROM

OT

P

PREAMP

HI

Z

INPUT

©

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.

Moos

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нзтюшноз

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измоа

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ОО-О

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7300W

|

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xe

me

ти

Зи

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ах

<3

z

ns

ER

a

mm

os

28

Se

Bm

А

SERIES

LEAR

SIEGLER.INC.

Е

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.

Hi

š

H5

V

OUTPUT

таз

B3-

349-000

TOV

(491)

то

WOT

INPUTS

сом?

вл

28

V

(6

ñ)

з5уст

сом

|

REO/

BLU

(лэп)

емо

CONTROL

MODEL

T2 2%

2%

SW.

3

835-670-000

са!

=

Sv

ввоу

el

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

Bogen MO100A User manual

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