BGW 250C Manual de usuario

, .

OV/t·'

ERS

r·1AilUft.L

r10DEL

250C

STEREO

POHER

AMP

t _

I -

I •

I _

-IMPORTP.NT-

PLEASE

READ

THIS

PAGE

BEFORE

OPERATING

YOUR

BGW

POweR

~~PLIF!ER

Your

ne~.;

EGW

pc<..;er

amplifier

designed

provide

years

trouble

free

performance.

Observing

these

few

precautions

will

insure

proper

operation.

Never

connec~

the

output

cne

channel

with

that

another.

Never

connect

direct

shcrt

from

the

output

any

channel

ground.

Connect

~he~ower

card

the

proper

voltage

~a~ns

(normally

-:::ls

-;.;ill

105-120

'/olts

AC,

50-60Hz).

not

remove

the

factory

le=.d

seal.

?JU.plifiers

'.-lill

not

covered

under

warran~y

~he

seal

braken.

:~ere

are

adjust~en~s

wi~h~n.

! .

\ .

TABLE

CONTENTS

DESCRIPTION

SPECIFICATIONS

FACTORY

SERVICE

INSTALU.TION

Unpacking

Mounting

Output

Connections

Input

Connecticns

Mains

and

Conversion

240

volts

OPER.4.TION

7 •

SCEE!-'.P.T!C

D!AGRP-!'1

·1

PARTS

LIST

10.

SERVICE

AU7HCRIZA'!!ON

FORM

DESCRIPTION

The

BGH

Model

250C

one

the

most

advanced

dual

solid

state

power

amplifiers

available.

Unique

design

features

incorporated

the

Model

250C

make

virtually

"FAIL

SAFE"

and

free

from

accidental

damage

caused

human

error

audio

service.

fast

acting

relay

circuit

employed

safeguard

for

your·speakers.

The

circuitry

controlling

the

relay

constantly

monitors

the

individual

outputs

each

channel.

~_en

any

positive

negative

component

than

+10

volts

occurs

the

output,

the

circuit

activates

the

relay

which

disconnects

the

speakers

from

the

amplifier.

The

speed

which

the

relay

responds

approximately

milliseconds

(see

figure

1).

The

relay

circuit

also

supplies

tL~e

delayed

cennection

~he

spe~~ers

the

amplifier

eliminate

unwanted

noises

turn

on.

the

front

panel,

the

en-off

switch,

gain

controls,

and

the

L.E.D.

pilot

lamp

and

clipping

indicators

are

mounted

for

ready

use.

Tne

packagL!g

inside

your

250C

lli!like

ordi~ary

power

amplifiers.

Each

ch~!nel

assembly

its

ewn

separate

module,

which

simply

plugs

out

fer

quick

and

easy

service.

Each

these

units

constructed

large

aluminlli~

extrusion.

The

~otal

radia~i~g

surface

area

each

heat

sink

330

square

inches.

The

heat

sinks

~ave

mating

circuit

boards

which

carry

the

passive

components.

Each

unit's

wiring

identical

with

the

circuits

are

pho~o

etched.

The

heat

sinks

plug

with

8-pin.

cennector.

The

O'..ltput

stage

your

al!lplifier

uses

the

!:lost

advanced

tj""?e

transistors

available.

~ese

large

geometry

power

devices

have

large

safe

eperating

area

aleng

base

with

extehded

power

bandwid~h.

All

the

semiconduc~ors

the

output

stage

are

int;~ate

contac~

wit~

the

hea~

sink.

~~e

bias

circui~

also

~ounted

~his

::'so~::-:'erm

"Nh~cn

provides

rock

steady

bias

stability

\vic:h

tem~era~~e.

The

voltage

gain

circuits

are

alse

lllounted

the

sa...'Ile

circuit

card.

true

operatienal

a...'Ilplifier

integrated

circuic:,

her-

metically

sealed

metal

can,

ac~s

the

front

end.

T~e

amp

(as

they

are

called)

special

anit

featuring

high

speed

iP...z)

and

high

sle''''

rate

(50

volts/!:licresecond)

yet

still

having

very

10f..,

noise

due

darli~gton

input

stage

and

careful

design.

The

amp

stage

followed

discrete

cemplementary

~a~r

acting

active

current

sO'..lrce/sink

and

provid~g

additienal

voltage

gain.

!he

current

scurce

the

ideal

way

drive

Gl.e

OU~pU1:

s~age

whic!1

basically

'lol"tage

fellower.

This

sophisticated

circuit

design

makes

for

extremely

accurate

amplifier.

The

open

loop

gain

higher

than

found

the

competitors

products..

The

accuracy

amplifier

function

the

ratio

the

open

loop

gain

the

closed

loop

gain.

this

case,

the

open

loop

gain

about

1,000,000.

This

extremely

accurate

signal

processing

enables

the

Model

250C

drive

speakers

very

high

levels

while

adding

absolutely

coloration

its

own.

Even

mill

hIatt

levels

the

output

waveform

exhiBits

sign

crossover

distortion.

The

dynamic

range

capability

typical

250C

almost

1~5dB.

2 •

I r

---

- -----

second

nmnlTI1TOTrrnmlrrrrllllllili

rrnr

SPEAKER

PROTECTION

TIME

D.C.

VOLTAGE

SPEAKER

TERMINAL

075

VS.

SIIUT

DOWN

TIME.

750

filS

625

rns

500

IRS

375

250

ros

125

inS

-V

V 30V

V 00 V

VOLTAGE

Figure

2. SPECIFICATIONS

The

followi:lg

specifications

are

guaranteed

minimum perfc::'r.1ance

levels,

:lot

typical

ces't

case

mllnbe~s

measured

ti.'"1de:,

c.esired.

conditions.

All

'test

procedures

used

are

accorc.ing

t~e

most

conservative

tec~iques

i:l

use

~oday.

STEREO

MODE

-8

OEP.S

POWER

OUTPUT:

100 'i;"atts

average

continuous

pCrder

per

cha::nel

TOTAL

F..ARMONIC

DISTORTION:

Less

th~'"1

0.1% f:'om

.25-105

watts

~er

cha:lnel

POI-iZR

BAND:

c.at

rated

porHer 1

-20

k..:':..z

DTPw'"T

SENSITIVI'r!:

Approx~:nately

volts

requ:"red

for

':'..l1l

ou'tp,~t

DA.l."!?ING

?ACTOR:

Greater

tha...'"1

500

low

freq'J.erl.cies

S:'EREO

~'!ODE

-4

O~S

pctVER

OUTPUT:

126

watts

average

ccnt

....

:"1'..lOUS

povTe.!"

per

clia.:,

....

"le.l

TC:'.:l.L

::".!3..:.'10NIC

:ISTC~T!mr:

...

~c.

--~-

~ess

~~an

0.15%

frc~

.2S-1S~

?Oiti::?

=J..l~J:

2a E= - 2

kEz

GA::-r

2Sd.3

l20x)

OU:'?TJT

:21P'E:JP1~C::::

Desi~ed.

for

any

load

~pedance

greater

t~n

c~s

?mfE:?

CU7?TJ7:

: 3J

",.;a~-:s

a'le~:.g==

c'.J~"':::"'-.."...,;.cu.s

?O~'ie~

:'G:

::..~_.rt~C'~IC

J:S::,2.::C~r:

:'ass

-::--:a.:l

.l%

:~o~

.2=-23G

"NC:~--:S

-:e=,

c!:..=.l"'J.:1e:

?C~'iE?~

2•

.!J~D:

2JE= - 2

G::E=

INPUT

SENSI:IV!T~:

App~oxima~;11

.75

volts

~eaui~ed

for

full

ou~put

~ONO

r!ODE

- 8

OF.HS

\VE..~

U:PUT

251

wa~~s

ave~age

continuous

power

TOTAL

F~Jl~ON!C

D!STOR!ION:

Less

than

.15%

from

.25-360

wa~~s

pe~

char~el

POWER

BAND:

kSz

INPUT

SENSITIV!TY:

Approx~a~ely

.SO

volts

~ecui=ed

for

full

ou~u~

GAIN:

320.9 (4.0x)

OUTPUT

r:!pED.A1'rc~:

De5~gned

for

ar.y

load

~~eca~oe

~eat;~

tha~

o~s

F~EQ1J~rC~

RES?ONSE:

+0,

-.2Sd3

20Hz

20kP.z

+0,

-3d3

2~z

5S~qz

!:-!

DISTCRTION:

(SO

anc

k~z

~:l)

:".:55

t::'a.'"'l .02%

~a-:;c. ?O'ile~

I:,I?Tj:'

:!::1:::~P.1TCE:

7 , 000 0

r-.ms

?~IS:::

7::~~:

.: :n:'c=::sacc:!c.s

;:,_7;:,:

~.1r~

:ro

:SE

GE= - :

JkEz

)

:J5

~elow

ratec

pcwe~

?C~'lZ~

?,EQUI~:2:'!E:~':':

,:-

1']5-120

volts

50-60::.=

-'-

'10:'

-:5

~:~!

c~r:

!~~e

~e:ay ~~lay

~~~~

C~,

will

a?pear

cu~;ut.

I •

I .

OUTPUT

PROTECTION:

Each

channel

protected

against

shorts,

open

circuit

operation,

mismatched

loads,

etc.

LOAD

PROTECTION:

unique

relay

circuit

protects

speakers

against

malfunction.

OVERALL

PROTECTION:

Power

line

protected

'IIi

fast

acting

circuit

breaker.

ilo

fuses

any

kind

are

used.

Two

thermal

switches

(one

per

channel)

protect

against

over

temperature

operation.

Controlled

power

bandwidth

and

slew

rate

protect

tweeters

and

~~plifier

against

excessive

high

frequency

operation.

Input

overload

protection

afforded

amp

series

limiting

resistance.

POWE~

SUPPLY:

large

power

transfor~er

with

t~in

primary

windings

~sed.

Computer

grade

electrolytic

capacitors

storing

over

joules

energy,

and

amp

bridge

rectifier

are

employed.

Two

zener

regulated

supplies

power

each

operational

amplifier

front

end.

POf../ER

REQUIRElSN'r'S:

Unit

reauires

either

l05-l20V

2l0-2~OV

50-60Hz

power.

A 5

amp

-circuit

breaker

supp

lied

fer

units

'.-lired

for

120?

operation

2.5

amp

brea~er

for

2~OV

cpera~ion.

HEAT

SINKnrG:

Each

channel

has

o~vr.

removable

heat

sink.

Each

extrusion

has

330

square

inches

surface

area.

CE..A..SSIS:

heavy

steel

c~assis

forms

prot:ective

cage

for

u~~atc~ed

mechanit;al

streng:t!1.

3/15"

al'..x.i--lI.l.ffi

r":.ck

mount

panel

suoolied.

All

modules

are

bolted

the

cr.assis.

The

pewer

s~pply

set

the

front

~a~el

allew

racx

mount:i~g

p';

;-hou

....

:.....~e

"se

ot:

____

.:::··.,..~o

.....

'"'u':,.4."

'l"'a';

-l,..Ir.r:-

~"'f_'-

I".

••

.J.

CONNECTCRS:

Out?ut:

Standard

3/~1t

spaci:1g,

bindi::g

pos~s

fer

ou~puts

(color

coded

for

easy

identi~icaticn).

l:nDut:

l/~"

phone

jack,

female

audio

connector.

AC'Line:

Three

wire

grounded

~ail

connector

fi~e

foot

. . ,

In1.n. caD

...

~ODULZS

,!,:"ree

plllg-in

:nodules

contain

95%

the

ci.rcui

t.ry.

:lodules

ccnsis~

two

hea~

sink

channel

assemblies

and

o~e

relav

circ'..li~

board.

CIRCUIT 30ARCS:

F:2l-:le

retardant

glass

epoxy

beards

:)er

ill':".:..

s~ec.

6 •

DI1'!ENSIONS:

Panel

19"

5~"

H x

11-3/4"

D -

black

annodized-grained

alumi:lum.

The

notchi:lg

standard

E.!.A./Western

Elect~ic.

fNEIGHT:

pounds

net

weight.

pounds

packaged

weight.

Shipping

container:

unique

double

boxed

system

providing

maximum

safety

for

the

unit.

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