BBE 381 Manuel utilisateur

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1

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Sound

Inc.

MODEL

381

GUITAR

PREAMP

USER

MANUAL

O

o

Important

Safeguards

A

To

prevent

fire

or

shock

hazard,

do

not

expose

the

unit

to

rain

or

moisture.

ATTENTiON:

RISQUE

DE

CHOC

ELECTRIC-

NE

PAS

OUVRIR.

The

lightning

flash

with

arrowhead

symbol,

within

an

equilateral

triangle,

is

intended

to

aiert

the

user

to

the

presence

of

uninsulated

"dangerous

voltage"

within

the

product’s

enclosure

that

may

be

of

sufficient

magnitude

to

constitute

a

risk

of

electric

shock

to

persons.

The

exclamation

point,

within

a

equilaterai

triangie

is

intended

to

alert

the

user

to

the

presence

of

important

operating

and

maintenance

(servicing)

instructions

in

the

iiterature

accompanying

the

appliance.

For

your

protection,

please

read

these

safety

instructions

completely

before

operating

the

appliance,

and

keep

this

manual

for

future

reference.

Carefully

observe

all

warnings,

precautions

and

instructions

on

the

appliance

and

described

in

the

operating

instructions

supplied

with

the

appliance.

INSTALLATION-

Water

and

Moisture

-

Do

not

install

the

appliance

near

water:

for

example,

near

a

bathtub,

washbowl,

kitchen

sink,

laundry

tub,

in

a

wet

basement,

or

near

a

swimming

pooi.

Heat

-

Do

not

instaii

the

appliance

near

sources

of

heat

such

as

radiators,

heat

regis¬

ters,

stoves,

or

other

appliances

that

pro¬

duce

heat,

USE

-

Power

Source

-

Connect

the

appliance

to

a

power

supply

only

of

the

type

described

in

the

operating

instructions

or

as

marked

on

the

appliance.

Power-Cord

Protection

-

Route

the

power

cord

so

that

it

is

not

likely

to

be

walked

on

or

pinched

by

having

objects

placed

on

it,

paying

particular

attention

to

the

plugs,

receptacles,

and

the

point

where

the

cord

exits

from

the

appliance.

SERVICE

-

Unplug

the

appliance

from

the

wall

outlet

and

consult

qualified

service

personnel

when:

•

the

power

cord

or

the

plug

has

been

damaged.

*

a

solid

object

or

liquid

has

fallen

into

the

cabinet.

Ventilation

-

Situate

the

product

so

its

location

or

position

does

not

interfere

with

its

proper

ventilation.

For

example,

you

should

not

place

the

product

on

a

bed,

sofa,

rug,

or

similar

surface

that

might

block

the

vent

openings,

or

placed

in

a

built-in

installation,

such

as

a

bookcase

or

cabinet

that

might

impede

the

flow

of

air

through

the

ventilation

openings.

Grounding

or

Polarization

-

Do

not

defeat

the

grounding

or

polarization

feature

of

the

AC

power

cord.

If

your

AC

receptacle

will

not

accept

the

power

cord

plug,

contact

your

electrician

to

install

a

proper

AC

receptacle.

When

not

in

use

-

unplug

the

power

cord

of

the

appliance

from

the

outlet

when

left

unused

for

a

long

period

of

time.

To

disconnect

the

cord,

pull

it

out

by

grasping

the

plug.

Never

pull

the

plug

out

by

the

cord.

*

the

appliance

has

been

exposed

to

rain

or

moisture.

*

the

appliance

does

not

appear

to

operate

normally

or

exhibits

a

marked

change

in

performance.

*

the

appliance

has

been

dropped,

or

the

enclosure

damaged.

Wall

or

Ceiling

Mounting

-

If

your

appliance

can

be

mounted

to

a

wall

or

ceil¬

ing,

mount

it

only

as

recommended.

AC

Receptacle

-

Check

to

make

sure

that

the

AC

receptacle

holds

the

power

cord

plug

firmly

and

securely.

If

the

power

cord

plug

is

loose,

contact

your

electrician

to

replace

the

defective

and

unsafe

AC

Foreign

Objects

-

Be

careful

that

foreign

objects

and

liquids

do

not

enter

the

enclosure

through

openings.

Do

not

attempt

to

service

the

appliance

beyond

that

described

in

the

operating

instructions.

For

all

other

sen/icing,

refer

to

qualified

sen/ice

personnel

only.

A_

TABLE

OF

CONTBITS

Precaution.i

Product

Description.1

Controls/Connections.2

Footswitch.6

Specifications.6

General

Operation/Applications.7-11

Service/Warranty

Information.12

Schematic

Diagrams.13-17

Congratulations

on

your

purchase

of

the

BBE

Model

381

Guitar

Pre-amp!

This

two

channel

guitar

pre-amp

offers

flexibility

unequaled

in

today’s

market

place.

With

the

BBE

38Ts

two

channels,

the

player

is

able

to

achieve

the

more

traditional

clean

and

overdrive

tones

while

leaving

room

to

create

some

unique

tones

of

his/her

own.

An

important

advantage

with

the

BBE

381

Guitar

Pre-amp

is

that

all

of

the

controls

are

front

panel

mounted.

This

allows

for

an

instantaneous

status

report

of

all

controls,

at

a

glance.

Additionally,

the

BBE

381

Guitar

Pre-amp

is

equipped

with

both

Main

Outputs

and

Recording

Outputs

to

increase

its

interfacing

capabilities.

So

whether

in

the

studio

or

on

stage,

the

BBE

381

will

indulge

players

of

any

style

or

caliber.

The

BBE

381

Guitar

Pre-amp

is

also

equipped

with

the

following

features:

1.

Custom

BBE

circuit

for

increased

tonal

quality

and

intelligibility

with

a

built-in

noise

suppressor.

2.

Passive

three

band

tone

controls

for

the

clean

channel

and

active

four

band

tone

controls

for

the

distortion

channel.

3.

Recording

Outputs

allow

the

user

to

plug

directly

into

a

mixing

console

or

to

record

direct

to

tape

and

still

have

that

full,

rich,

cabinet

sound

that

the

player

enjoys

hearing.

The

importance

of

this

feature

is

most

evident

in

eliminating

the

need

to

transport

a

speaker

cabinet

or

the

use

of

microphones

for

sound

reinforcement.

4.

A

Stereo

Effects

Loop

to

interface

the

BBE

381

with

the

most

popular

of

effects

processors.

5.

Independent

channel

volumes

to

coordinate

the

proper

level

blend

between

the

clean

and

distortion

channels.

6.

Channel

Select

Footswitch

to

switch

between

the

Clean

and

Distortion

channels.

The

following

sections

will

provide

detailed

information

on

all

of

the

BBE

38Ts

functions.

IMPORTANT

Before

you

begin,

please

check

the

contents

of

this

box

to

insure

that

included

are:

1.

The

BBE

381

Guitar

Pre-amp.

2.

The

Channel

Select

Footswitch.

3.

A

25’

two

conductor

cable.

4.

BBE

381

User’s

manual.

If

any

of

these

items

are

found

to

be

missing,

contact

your

BBE

dealer

from

whom

the

unit

was

purchase

immediately.

1

A_

CONTROLS

AND

CONNECTION

FRONT

PANEL

1.

INPUT:

This

jack

allows

for

the

connection

of

the

guitar

to

the

BBE

381

pre-amp.

2.

CH.

1

:

This

“GREEN”

LED

illuminates

when

the

Clean

Channel

is

selected.

CLEAN

CHANNEL

3.

VOLUME:

This

knob

controls

the

level

of

the

Clean

Channel

volume.

Use

this

knob

in

conjunction

with

the

Distortion

Channel’s

volume

knob

to

achieve

the

desired

balance.

4.

BASS:

This

control

adjusts

the

amount

of

low

frequency

content,

shelved

at

80Hz,

within

the

channel.

Turning

the

knob

to

its

maximum

position

(fully

clockwise)

boosts

the

low

frequencies

+10dBu.

Turning

the

knob

to

the

minimum

position

(fully

counter-clockwise)

would

be

flat

or

no

change.

5.

MID:

This

control

adjusts

the

amount

of

mid

range

frequency

content,

peaked

at

500Hz,

within

the

channel.

Turning

the

knob

to

its

maximum

position

(fully

clockwise)

boosts

the

mid

range

frequencies

-t-8dBu.

Turning

the

knob

to

its

minimum

position

(fully

counter-clockwise)

would

be

flat

or

no

change.

6.

HIGH:

This

control

adjusts

the

amount

of

high

frequency

content,

shelved

at

6kHz,

within

the

channel.

Turning

the

knob

to

its

maximum

position

(fully

clockwise)

boosts

the

high

frequencies

-i-IOdBu.

Turning

the

knob

to

its

minimum

position

(fully

counter-clockwise)

would

be

flat

or

no

change.

7.

CHANNEL

SELECT:

This

button

allows

for

the

selection

between

the

Clean

and

Distortion

Channels.

When

in

the

“OUT”

position,

the

“GREEN”

LED

will

illuminate,

indicating

that

the

Clean

Channel

has

been

selected.

When

depressed,

the

“IN”

position,

the

“RED”

LED

will

illuminate

indicating

that

the

Distortion

Channel

has

been

selected.

This

function

may

also

be

controlled

by

the

BBE

footswitch.

Note:

The

Channel

Select

switch

on

the

front

panel

of

the

BBE

381

will

be

disabled

while

the

footswitch

is

connected.

8.

CH.

2:

This

“RED”

LED

illuminates

when

the

Distortion

Channel

is

selected.

DISTORTION

CHANNEL

9.

DRIVE:

This

knob

controls

the

amount

of

“touch

responsive”distortion

that

is

applied

to

the

second

channel.

Minimum

distortion

is

achieved

when

the

“Drive”

knob

is

turned

completely

counter-clockwise.

Turning

this

knob

clockwise

increases

the

amount

of

distortion

and

sustain.

Note:

The

degree

of

“touch

response”diminishes

as

the

“Drive”

level

is

increased.

10.

BASS:

This

control

adjusts

the

amount

of

the

low

frequency

content,

peaked

at

130Hz,

within

the

channel.

Turning

the

knob

to

its

maximum

position

(fully

clockwise)

boosts

the

low

frequencies

-i-15dBu.

Turning

the

knob

to

its

minimum

position

(fully

counter-clockwise)

would

be

flat

or

no

change.

11.

MIDI:

This

control

adjusts

the

amount

of

mid

range

frequency

content,

peaked

at

340Hz,

within

the

channel.

Turning

the

knob

to

its

maximum

position

(fully

clockwise)

boosts

the

mid

range

frequencies

-i-15dBu.

Turning

the

knob

to

the

minimum

position

(fully

counter-clockwise)

reduces

the

mid

range

frequencies

-5dBu.

The

10

o’clock

position

would

be

flat

or

no

change.

3

12.

MID

2:

This

control

adjusts

the

amount

of

mid

range

frequency

content,

peaked

at

750Hz,

within

the

channel.

Turning

the

knob

to

its

maximum

position

(fully

clockwise)

boosts

the

mid

range

frequencies

+15dBu.

Turning

the

knob

to

the

minimum

position

(fully

counter-clockwise)

reduces

the

mid

range

frequencies

-5dBu.

The

10

o’clock

position

would

be

flat

or

no

change.

13.

TREB:

This

control

adjusts

the

amount

of

high

frequency

content,

peaked

at

4kHz,

within

the

channel.

Turning

the

knob

to

its

maximum

position

(fully

clockwise)

boosts

the

high

frequencies

-i-18dBu.

Turning

the

knob

to

the

minimum

position

(fully

counter-clockwise)

would

be

flat

or

no

change.

14.

VOLUME:

This

knob

controls

the

level

of

the

Distortion

Channei

volume.

Use

this

knob

in

conjunction

with

the

Clean

Channel’s

volume

knob

to

achieve

the

desired

balance.

BBE

PROCESS

15.

IN:

This

switch

engages

the

BBE

process.

When

depressed,

the

“IN”

position,

the

“GREEN”

LED

will

illuminate.

When

in

the

“OUT’

position,

the

“GREEN”

LED

will

not

illuminate,

indicating

that

the

BBE

process

has

been

disengaged.

16.

BBE

PROCESS:

This

control

introduces

the

BBE

process

which

has

specially

modified

for

the

BBE

381

Guitar

Pre-amp.

The

BBE

process

gives

the

user

a

more

detailed

perception

of

tonality,

added

“bite”

and

increased

clarity.

The

guitar’s

lower

tones

will

be

tightened

without

losing

their

thunderous

effect...

all

without

adding

or

creating

any

additional

noise

or

harmonic

distortion.

When

the

knob

is

in

its

minimum

position,

no

process

is

taking

effect

and

the

circuit

is

in

its

noise

suppression

mode.

Turning

the

knob

clockwise

will

introduce

the

BBE

process.

Adjust

the

knob

to

mix

the

desired

amount

of

process

for

your

own

needs.

The

BBE

process

also

has

its

own

in/out

switch

for

comparison

of

the

processed

to

unprocessed

signal

on

the

front

panel

of

the

BBE

381

pre-amp.

Experiment

with

the

process.

Use

the

BBE

as

an

extension

of

the

tone

controls.

Please

note

that

the

BBE

process

is

not

an

effect,

but

an

improvement.

A

good

place

to

start

with

the

BBE

process

is

to

set

the

knob

to

its12

o’clock

position

and

adjust

accordingly.

Note:

The

BBE

process

is

applied

before

the

effects

send.

MASTER

VOLUME

1

7

.

LEFT:

This

knob

controls

the

“Main

Output”

and

“Recording

Output”

levels

for

the

“LEFT”

side.

This

control

will

not

change

the

channel

balance

that

has

been

established

with

the

respective

channel

volumes.

18.

RIGHT:

This

knob

controls

the

“Main

Output”

and

“Recording

Output”

levels

for

the

“RIGHT”

side.

This

control

will

not

change

the

channel

balance

that

has

been

established

with

the

respective

channel

volumes.

19.

POWER:

This

switch

applies

AC

power

to

the

BBE

381

Guitar

Pre-amp.

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RIGHT

(MONO)

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EFFECTS

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RIGHT

SEND

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1.

POWERCORD:

This

is

a

standard

three-pronged

AC

power

cable

for

connection

to

any

standard

grounded

110Vac

outlet.

2.

FUSE:

Replace

ONLY

with

same

type

Fast

blow

fuse.

U.S.,

Canadian

and

Japanese

models:

250Vac,

1/2A

Fast

blow

Standard

model:

250Vac,

.125A

Fast

blow

MAIN

OUTPUTS

3.

LEFT

&

RIGFIT:

These

stereo,

Right

and

Left

unbalanced

1/4”

outputs,

are

for

connecting

the

BBE

381

Guitar

Pre-amp

to

the

next

subsequent

component

in

the

system.

Used

in

conjunction

with

the

Master

Volume,

these

outputs

can

accommodate

any

required

output

level.

Note:

The

LEFT

output

should

be

used

if

only

one

output

is

required.

RECORO

OUTPUTS

4.

LEFT

&

RIGHT:

These

stereo,

Right

and

Left

unbalanced

1/4”

outputs

are

for

connecting

the

BBE

381

Guitar

Pre-amp

to

a

mixing

console

or

tape

deck.

They

have

a

unique

active

filter

which

simulates

a

speaker

cabinet,

therefore

eliminating

any

need

for

“Miking”

the

speaker

cabinet

or

transporting

any

unnecessary

equipment.

Note:

The

LEFT

output

should

be

used

if

only

one

output

is

required.

The

Master

Volume

will

effect

Record

Outputs

simultaneously

with

the

Main

Outputs.

EFFECTS

LOOP

5.

RETURN:

Use

these

jacks,

Left

and

Right,

to

connect

to

an

effects

processor’s

stereo

output.

If

the

effector

is

monaural,

use

the

Left

return

jack.

This

will

cause

the

effected

signal

to

be

the

same

at

both

the

Left

and

Right

outputs.

6.

SEND:

Use

this

jack

to

connect

the

BBE

381

pre-amp

to

an

effects

processor’s

input.

This

level

is

approximately

-lOdBu

depending

upon

the

status

of

the

individual

channel’s

Volume

and

Tone

Control

settings.

CHANNEL

SELECT

FOOTSWITCH

7.

CHANNEL

SELECT

FOOTSWITCH:

Use

this

jack

to

connect

the

BBE

381

pre-amp

to

the

Channel

Select

Footswitch

via

any

two

conductor

type

cable.

Note:

The

Channel

Select

switch

on

the

front

panel

of

the

BBE

381

will

be

disabled

while

the

footswitch

is

connected.

CHANNEL

SELECT

FOOTSWITCH

IMPORTANT:

The

front

panel

channel

select

switch

will

be

defeated

when

the

footswitch

is

connected.

The

Footswitch

is

for

selecting

either

the

Clean

or

the

Distortion

Channels.

Using

the

front

panel

LED’s

as

reference

indicators,

the

“GREEN”

LED

will

illuminate,

indicating

that

the

Clean

Channel

has

been

selected.

Depressing

the

switch

will

illuminate

the

“RED”

LED,

indicating

that

the

Distortion

Channel

has

been

selected.

Note:

Upon

connecting

the

Footswitch

to

the

BBE

381

Guitar

Pre-amp,

the

operational

channel

will

be

that

of

the

last

selection

determined

by

the

user

or

factory

and

is

changeable

at

any

time.

SPECIFICATIONS

Power

Requirements:

U.S.

&

Canadian

models:

120VAC,

50/60Hz,

8

WATTS

Standard

model:

220VAC,

50/60Hz,

8

WATTS

Fuse:

Replace

with

the

same

type

FAST

BLOW

fuse.

U.S.

and

Canadian

models:

250Vac,

1/2A

Fast

blow

type

fuse

Standard

model:

250Vac,

.125A

Fast

blow

type

fuse

Dimensions:

19”(W)

x

5.5”(D)

x

1.7”(H)

Shipping

Weight:

9lbs.

A_

GB\IERAL

OPERATION

In

order

to

reduce

the

risk

of

damage

to

any

equipment,

properly

connect

all

cables

and

power

cords

before

turning

on

any

components

in

the

system.

Most

important

of

all,

ALWAYS

TURN

ON

THE

POWER

AMPLIFIER

LAST

TO

AVOID

DAMAGING

THE

SPEAKERS.

Select

either

the

Clean

or

the

Distortion

channel

via

the

front

panel

switch

or

the

Footswitch.

Next,

adjust

the

tone

controls

to

achieve

the

desired

frequency

response.

The

tone

controls

are

specifically

tailored

for

their

respective

channels

with

passive

circuitry

for

the

Clean

channel

and

active

circuitry

for

the

Distortion

channel

to

insure

accurate,

no

bleed

through,

adjustment

from

one

tone

control

to

the

next.

Used

with

a

variety

of

guitars

and

pick-up

configurations,

the

BBE

381

Guitar

Pre-amp

is

able

to

achieve

almost

any

tone

desired.

The

BBE

process

is

a

unique

feature

that

only

BBE

Guitar

Pre-amps

possess.

The

BBE

process,

most

noted

for

its

ability

to

increase

the

clarity

and

the

tonal

quality

of

the

music

program,

is

achievable

without

adding

any

unwanted

noise

or

harmonic

distortion.

Use

this

feature

as

an

extension

of

the

tone

controls

and

as

a

means

of

improving

the

overall

tonality

of

the

guitar’s

signal.

Use

the

front

panel

switch

to

compare

the

processed

to

unprocessed

sound.

The

advantage

of

having

the

BBE

process

will

be

further

emphasized

when

used

in

conjunction

with

effects

processors.

The

Master

Volume

controls

are

separate

for

each

of

the

right

and

left

outputs.

This

will

allow

the

guitar

player

added

flexibility

when

playing

live.

If

the

guitar

player

is

utilizing

the

system

in

a

stereo

configuration,

it

is

possible

to

achieve

an

adequate

volume

mix

from

side

to

side.

Any

volume

differences,

whether

created

by

different

impedance

speaker

cabinets

or

by

an

effects

processor

can

be

accommodated

quickly

and

easily.

Note:

The

Master

Volumes

will

affect

the

Main

Outputs

and

Record

Outputs

simultaneously.

The

Record

Outputs

are

a

welcome

feature

for

any

guitar

player

who

is

constantly

mobile

or

where

space

and

volume

levels

are

prohibitive.

The

connection

of

the

BBE

381

Guitar

Pre-amp

directly

to

a

mixing

console

or

tape

recorder

while

maintaining

a

warm

guitar

cabinet

sound

is

now

possible.

Additionally,

the

inconvenience

of

“miking”

or

transporting

a

guitar

speaker

cabinet

is

eliminated.

The

Effects

Loop

on

the

BBE

381

Guitar

Pre-amp

will

accommodate

any

rack-mount

or

pedal

effects

processor.

The

effects

send

level

will

vary

depending

on

the

tone

and

volume

control

settings.

Use

the

following

illustrations

to

provide

elementary

configurations

and

tone

control

settings.

A

_

SUBGESTED

TONE

SETTINGS

USING

THE

BBE

381

GUITAR

PRE-AMP

WITH

“SINGLE

COIL”

TYPE

PICK-UPS

o

o

CLEAN

CHANNa

niCT

DISTORTION®

CHANNEL

MASTER

ON

USING

THE

BBE

381

GUITAR

PRE-AMP

WITH

“HUMBUCKING”

TYPE

PICK-UPS

o

o

CLEAN

CHANNEL

‘saf^

DISTORTION®

CHANNEL

MASTER

®

O

IMW.

®

o

Note:

Use

these

settings

as

a

starting

point.

Your

finai

resuits

may

vary

due

to

the

guitar’s

unique

tonal

characteristics.

8