Bryston BP-20 User manual

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2

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1

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setup

Recommendations:

Congratulations

on

your

purchase

of

a

Bryston

preamplifier.

We

are

confident

it

will

provide

you

with

many

years

of

musical

enjoyment.

You

may

place

your

preamplifier

in

any

conive-

mient

location,

with

two

possible

exceptions.

If

you

own

the

Bryston

BP-25

remote-control

version,

position

the

preamplifier

to

maintain

a

direct

line-of-sight

between

the

hand-held

remote

and

the

remote

sensor

eye

located

on

the

left

side

of

the

preamplifier’s

front

panel.

If

you

purchased

the

BP-25P

or

BP-25MC,

which

includes

a

Phono

section,

avoid

placing

the

pream-

plifier

directly

on

top

of

your

power

amplifier..

Power

amplifiers

usually

employ

large

power

supplies

and

the

transformer(s)

in

the

power

supplies

can

cause

interfer-—

ence

(hum)

with

the

sensitive

phono

section

inside

the

preamp.

|

BP-PS

Power

Supply:

The

BP-PS

outboard

power

supply

provides

AC

power

for

the

BP-20

and

BP-25

preamplifiers.

It

has

a

slide

power

switch

located

on

the

front

and

a

green

LED

to

indicate

power

on.

On

the

rear

of

the

unit

is

a

three-position

con-

nector

which

provides

a

control

voltage

for

remote

turn

on/off

of

your

Bryston

THX

amplifier(s)

or

other

ampli-

fiers

so

equipped.

This

feature

can

be

used

in

two

ways

depending

on

the

wiring

arrangement

utilized:

Option

one

provides

for

the

preamplifier

and

power

amplifier

to

be

turned

on

or

off

when

you

operate

the

power

switch

located

on

the

front

of

the

external

power

supply.

Turning

the

power

off

with

the

switch

on

the

outboard

power

supply

removes

AC

power

Connections:

Connect

the

preamplifier’s

left

and

right

outputs

from

either

the

RCA

or

Balanced

XLR

connectors

to

the

appropriate

left

and

nght

input

jacks

on

your

power

amplifier.

Balanced

cables

are

an

advan

if

you

are

using

long

runs

of

cable,

(greater

than

20

feet),

between

your

preamplifier

and

power

amplifier.

~

Connect

your

CD

player,

tuner,

tape

deck,

video

recorder,

or

laser

disc,

etc.

to

the

specific

left/right

pream-

plifier

inputs.

With

phono-equipped

models,

(BP-25P

or

BP-25MC),

connect

your

phono

cables

to

the

phono

input

jacks.

If

your

turntable

leads

have

a

separate

ground

wire,

it

may

be

connected

to

the

ground

lug

adjacent

to

the

phono

inputs

on

the

rear

panel.

Next,

insert

the

5-pin

din

cable

from

the

out-

board

power

supply

into

the

input

connector

located

on

the

rear

of

the

preamplifier.

Then

plug

the

power

supply

into

an

appropriate

AC

power

outlet.

The

preamplifier

1s

powered

up

by

engaging

the

slide

switch

located

on

the

front

of

the

extemal

power

supply.

The

“green”

LED

on

the

outboard

power

supply

and

the

preamplifier

front

panel

indicates

power-on.

If

the

preamplifier

has

been

placed

in

the

“mute”

position

operating

the

volume

up

button

on

the

remote

will

automatically

un-mute

the

BP-25

pream-

plifier,

turning

the

LED

from

red

to

green.

On

the

BP-20

you

must

manually

activate

the

mute

toggle

on

the

front

panel.

Both

the

Mute

switch

and

the

Polarity

Invert

switch

are

momentary-toggle

types,

oper-

ated

by

push-and-telease.

from

both

the

preamplifier

and

the

power

amplifier(s)

for

complete

system

shut-down.

Option

two

allows

the

power

amplifier(s)

to

be

turned

on

or

off

with

the

mute

button

on

the

hand-held

remote

control

unit

or

the

mute

toggle

on

the

front

panel

of

the

preamplifier.

This

will

shut

down

your

systern

“for

the

mght’,

completely

removing

power

from

the

amplifiers,

but

leaving

the

preamp

in

the

Mute/

standby

mode,

indicated

by

the

red

LED

on

the

prearpli-

fier’s

front

panel.

Please

refer

to

the

diagram

on

the

included

separate

instruction

sheet

for

further

clarity

and

optional

wiring

afrangements.

The

Bryston

BP-20

and

BP-25

preamps

also

feature

two

pairs

of

balanced

XLR

input

jacks.

Many

signal

sources,

including

CD-players

and

separate

D/A

converters

are

now

available

with

Balanced

outputs

for

munimum

noise

pickup

on

the

cables.

The

tape

loop

may

be

used

to

insert

a

surround

sound

processor,

cassette

tape

deck

or

video

tape

recorder

into

your

system.

Plug

your

tape

deck

or

extemal

proces-

sor’s

imput

cables

into

the

“To

Tape’

jacks,

and

the

proces-

sor

or

deck’s

output

cables

into

the

‘From

Tape’

jacks

at

the

rear

of

the

preamp.

The

tape

or

processor

loop

may

be

operated

via

the

toggle

switch

located

on

the

front

panel

of

the

preamplifier.

Page

2

Input

and

Output

Connectors:

Bryston

preamplifiers

are

equipped

with

five

paits

of

RCA

input

connectors,

two

pairs

of

balanced

XLR

input

connectors

and

one

pair

of

RCA

tape

input

jacks.

The

balanced

inputs,

(pin-1

ground,

pin-2

post-

tive

and

pin-3

negative).

All

inputs

employ

fully

dis-

crete

active

input

circuitry.

Two

pairs

of

RCA

main

outputs,

one

pair

of

RCA

tape

outputs

and

one

pair

of

balanced

XLR

outputs

are

also

provided.

All

input

and

output

connectors

on

the

BP-20

Bryston

BP-25

Remote

Control:

The

Bryston

model BP-25

is

supplied

with

a

hand-held

remote

control

unit.

The

remote

features

in-

clude

Volume

control,

Mute,

and

Polarity

Invert.

All

remote

control

functions

may

be

operated

manually

from

the

front

panel

of

the

preamplifier

1f

desired.

The

Volume

Control

is

a

motor-driven

design.

This

approach

ensures

the

lowest

distortion

with

maxt-

mum

long

term

reliability.

The

Polarity-Invert

switch

allows

you

to

reverse

the

absolute

phase

of

the

audio

signal,

(not

to

be

confused

with

left-versus-right

channel

phase),

because

polarity

reversal

can

occur

in

the

recording

chain.

(In

fact,

our

investigations

show

that

polarity

is

not

consistently

main-

tained

in

commercial

recordings).

It

is

desirable

to

main-

tain

absolute

phase

as

originally

played

in

the

recording

Bryston

MMM

and

MC

Phono

Section:

Bryston’s

Phono

section

1s

available

in

the

BP-20

or

BP-25

preamplifiers.

It

features

state-of-the-art

accu-

racy

in

equalization,

extremely

low

noise

and

distortion,

and

provides

headroom

margins

sufficient

to

prevent

overload

from

any

known

phono

source.

|

The

Phono

section

may

be

ordered

in

either

of

two

versions:

Moving-Coil,

(Model

BP-20MC

or

BP-

25MC),

or

Moving-Magnet,

(Model

BP-20P

or

BP-25P).

The

BP-20MC

and

the

BP-25MC

provides

a

front

panel

switch

to

choose

the

additional

gain

required

for

moving

coil

cartridges

Gee

diagram

page

4).

To

access

the

Phono

section

on

theBP-20MC

or

BP-25MC,

simply

plug

your

tumtable

interconnect

leads

into

the

Phono

‘inputs

on

the

rear

panel

of

the

preampli-

fier

.

Engage

the

MM/MC

Phono

togple-switch

located

on

the

front

panel

of

the

preamplifier

to

the

appropriate

moving-magnet

or

moving-coil

position

and

tum

the

“Source”

rotary

selector

knob

on

the

front

panel

to

and

BP-25

are

gold-plated.

Only

cables

with

high

quality

gold

plated

connectors

should

be

used

with

your

pteamp

to

avoid

noise

and

distortion

from

the

corrosion

which

will

eventually

appear

on

poorly

plated

cable

connectors.

Bryston

offers

RCA

or

XLR

cables

with

con-

nectors

gold-plated

to

20

microinches,

(up

to

30

times

heavier

than

standard

gold-flashed

cables).

Standard

1

and

2

meter,

or

custom-length

cables,

are

available.

hall,

as

that

will

provide

the

most

accurate

representation

of

the

original

wavefront.

This

may

be

audible

in

some

cases

as

a

more

realistic

rendition

of

musical

transients

when

the

proper

polarity

for

that

recording

is

selected.

The

Bryston

BP-20/BP-25

preamplifiers

maintain

non-

inverting

polarity

at

the

Main

output

for

all

inputs

when

the

pilot

light

is

green,

and

inverting

polarity

for

all

inputs

when

the

LED

1s

yellow.

The

“lo

Tape’

outputs

are

always

non-inverting.

The

Mute

control

mutes

the

output

of

the

preamplifier

to

allow

for

interruptions

without

affecting

the

volume

control

setting.

(Refer

also

to

the

Power

Supply

section

of

this

instruction

sheet

for

information

regarding

remote

Amplifier

control

via the

Mute

switch).

Phono.

(Please

ensure

the

MM/MC

switch

is

in

the

correct

position

for

your

cartridge,

or

your

system

will

display

audible

problems,

such

as

poor

frequency

te-

sponse,

low

output,

or

both).

If

your

turntable

provides

a

separate

ground

lead,

system

noise

may

be

minimized

by

connecting

it

to

the

ground

lug

adjacent

to

the

phono

inputs

on

the

rear

panel.

|

The

BP-20P

and

BP-25P

hookup

procedure

1s

similar,

with

the

exception

that

there

is

no

front

panel

switch

between

MM

and

MC.

(This

is

replaced

with

the

Stereo/Mono

switch).

The

Bryston

BP-20

and

BP-25

are

line-level

preamplifiers

only.

You

may

acquire

Moving-Magnet

or

Moving,

Coil

phono

capability

by

returing

it

to

the

factory

for

updating.

We

also

offer

the

Moving-Coil

setup

stage,

as

an

outboard

unit

(IF-1),

if

your

preamplifier

already

contains

a

Moving-Magnet

phono

section.

Page

3

BP-20

Front

Panel

VOLUME

OUT

BP-25

Froni

Panel

VOLUME

BPRES

BRYSTON

PREAMPLIFIERS

BP-25

and

BP-20

Functions:

MPS-1

POWER

SUPPLY

:

LED

indicates

GREEN

when

power

on.

Provides

12-Volt

supply

for

remote

turn-on

of

Bryston

THX

power

amplifier(s)

or

others

so

equipped.

PREAMPLIFIER

LED:

Indicates

RED

when

output

muted.

GREEN

indicates

output

is

non-inverting

polarity.

YELLOW

indicates

output

has

inverted

polarity.

HEADPHONE

OUTPUT

(BP-25):

Allows

monitoring

of

any

input

source

with

the

use

of

head-

phones.

It

is

recommended

that

you

use

headphones

with

input

impedances

greater

than

50

ohms

for

optimal

performance.

If

you

wish

to

mute

your

loudspeakers

while

listening

to

your

headphones

simply

engage

the

MUTE

switch

on

the

preamphi-

fier

(LED

turns

red).

Be

sure

#of

to

use

your

remote

control

(use

the

front

panel

volume

control)

to

adjust

the

volume

while

listening

to

your

headphones,

as

the

remote

will

‘unmute’

the

preamplifier

on

‘volume

up’.

FRONT

PANEL

CONTROLS:

MUTE/NORMAL

TOGGLE:

Mutes

or

releases

mute

at

the

main

outputs,

(not

“To

Tape’

outputs),

without

changing

the

volume

control

setting,

each

time

pushed.

POLARITY/INVERT

‘TOGGLE:

Reverses

polarity

at

main

outputs

each

time

pushed.

(GREEN

LED

indicates

positive

polarity,

YELLOW

LED

indicates

inverse

polarity).

VOLUME:

Rotary

control

varies

the

output

level

to

the

‘MAIN

OUTPUTS’,

(does

not

effect

“TO

TAPE’

outputs).

BALANCE:

Rotary

control

adjusts

the

left-versus-nght

chan-

nel

levels.

The

Balance

Control

is

a

tailored-inflection

type

which

has

very

gradual

action

near

the

center

of

rotation

allowing

fine

adjustments

to

the

stereo

mage.

For

convenience

the

electncal

center

of

the

control

is

detented.

SOURCE:

Rotary

knob,

determines

which

input

will

appear

at

the

“TO

TAPE’

outputs

for

recording

or

processing,

as

well

as

determining

which

program

is

available

at

the

Main

outputs.

(When

the

“TAPE/SOURCE’

switch

is

in

‘Tape’

position,

“TAPE

FROM?

inputs

appear

at

Main

Outputs).

MONO/STEREO

SWITCH:

‘Stereo’

position

provides

two-channel

stereo

at

the

Main

outputs.

‘Mono’

position

sums

the

main

outputs

to

monaural.

The “TO

TAPE?

outputs

are

always

stereo.

(Switch

not

present

on

BP-25MC),

PHONO

SWITCH

(BP-25MC

only):

Allows

the

selection

of

either

Moving-Magnet

or

Moving-Coil

phono.

(BP-25MC

preamplifiers

are

equipped

with

a

Phono

MM/MC

switch

in

place

of

the

Mono/Stereo

switch).

TAPE/SOURCE

SWITCH:

Source

(down)

position

moni-

tors

whichever

input

is

selected

at

the

rotary

SOURCE

selector

knob.

Tape

(up)

position

provides

monitoring

of

the

‘FROM

TAPE’

input

for

A/B

comparison

with

the

source.

Should

an

external

processor

or

equalizer

be

connected

in

the

TAPE

LOOP,

the

“TAPE/SOURCE”

switch

will

act

as

an

in/out

switch

for

the

external

equipment.

REAR

PANEL

CONNECTORS:

BALANCED

OUTPUTS:

Output

is

taken

from

the

three-

pin

“XLR”

type

connectors.

Pin-1

is

ground

-

Pin-2

is

the

positive

(+)

output

and

Pin

3

is

the

inverted

output.

The

output

is

“ACTIVE

BALANCED”

(no

transformer).

Never

connect

pin

2

or

pin

3

to

each

other,

to

pin

1,

or

any

ground.

‘The

outputs

are

capable

of

driving

30

volts

to

any

load

600

ohms

or

greater

in

balanced

operation.

UNBALANCED

OUTPUTS

:

There

are

two

parallel

unbal-

anced

outputs

for

each

channel

available,

utilizing

gold-plated

RCA-style

connectors.

The

output

is

always

in-phase

with

the

input,

and

is

capable

of

delivering

15

volts

into

any

load

of

600

ohms

or

greater.

TO-TAPE-FROM:

The

‘TO

TAPE’

outputs

are

selected

by

the

rotary

“SOURCE”

knob

and

are

provided

as

a

recording

output.

This

feed

is

unaffected

by

the

operation

of

other

front

panel

controls.

The

‘FROM

TAPE’

(unbalanced

RCA)

input

is

useful

for

monitoring

tape

playback

or

processed

signals.

Mov-

ing

the

“T'ape/Source”

toggle

to

‘Tape’

(up)

position

monitors

the

recorded

signal

on

recorders

equipped

with

a

separate

playback

head,

or

the

processed

signal

when

using

a

signal

processor.

Input

sensitivity

is

500mv,

input

impedance

is

10K

ohms

.

UNBALANCED

INPUTS:

Input

connectors

are

gold

plated

RCA

Phono

jacks.

Input

sensitivity

is

500mv,

input

impedance

is

50K

ohms.

On

BP-25P,

Phono

input

impedance

is

47K,

sensitivity

is

5

mV.

On

BP-25MC,

MMohms.

Phono

input

is

as

above,

MC

Phono

input

impedance

is

180

Ohms,

sensitivity

is

0.35

mV.

BALANCED

INPUTS:

Balanced

input

connectors

are

gold-

plated

3-pin

“XLR”

style

connectors.

Pin

1

is

ground,

Pin

2

is

positive

input

(+)

and

pin

3

is

the

inverting

input

(-).

Input

sensitivity

is

1

volt,

input

impedance

is

15k

Page

5

BRYSTON

LTD.

P.O.

BOX

2176

677

NEAL

DRIVE

PETERBOROUGH,

ONTARIO

CANADA.

KSJ

7Y4.

Bryston

products

are

warranted

to

be

free

from

manufacturing

defects

for

a

minimum

of

twenty

years

from

the

original

date

of

manufacture.

This

includes

parts,

labour

and

return

shipping

to

the

first

owner

and

all

subsequent

owners.

Warranty

coverage

is

automatic

and

com-

mences

with

the

original

date

of

manufacture

which

is

kept

on

file

at

Bryston.

In

the

event

of

a

defect

or

malfunction,

Bryston

will

remedy

the

problem

by

repair

or

replace-

ment,

as

we

deem

necessary,

to

restore

the

product

to

full

performance.

This

warranty

is

considered

void

if

the

defect,

malfunction

or

failure

of

the

product

or

any

component

part

was

caused

by

damage

(not

resulting

from

a

defect

or

malfunction)

or

abuse

while

in

the

possession

of

the

customer,

tampering

by

persons

other

than

factory-

authorized

service

personnel,

or

failure

to

com-

ply

with

Bryston

operating

instructions.

This

warranty

gives

you

specific

legal

rights

and

you

may

also

have

other

rights

which

may

—

vary

from

province

to

province

and

country

to

country.

¢

BRYSTON

SERVICE

IN

CANADA:

24

STEINWAY

BLVD.,

UNIT

48

ETOBICOKE,

ONTARIO

MSW

6T3

PHONE:

416-675-2585

FAX:

416-675-3103

e

BRYSTON

SERVICE

USA:

79

COVENTRY

STREET

NEWPORT,

VERMONT

PHONE:

802-334-1201

FAX:

802-334-6658

°

BRYSTON

SERVICE

OUTSIDE

CANADA:

CONTACT

YOUR

LOCAL

DISTRIBUTOR

:

OR:

CALL

BRYSTON

DIRECTLY

AT:

PHONE:

705-742-5325

FAX:

705-742-0882

www.bryston.ca