Audio Research SP-5 Bedienungsanleitung

REV.

10/78

MODEL

SP-5

PREAMPLIFIER

INSTRUCTION

MANUAL

audio

research

H I G H D E F I N I T I O N®

5740

GREEN

RCLE

DRIVE/ MINNETONKA, MINN

OTA

55343

PHONE

612/939

0600

FAX

612/939

0604

INTRODUCTION

Congratulations

your purchase.

The

SP-5

stereo preamplifier

was

conceived

and

designed for audio

perfectionists.

Analog

Module"

circuitry

provides

unequaled performance under actual

dynamic

listening

conditions.

addition to the basic audiophile

features,

the

SP-5

has: provisions for

optional

(*)

low

level

head

amp,

controlled turn-on

characteristics

for

nimimum

output

thump

1600

watt relay contra

power

outlets,

high

quality

anodized

aluminum

panels, knobs,

and

handles,

and

scuff-resistant

chassis

finish.

Conservative design

and

extensive use

high

quality

industrial

grade

components

insure

many

years

trouble-free

performance.

WARRANTY

A limited

90-Day

Warranty

(from

the date

purchase

the original purchaser)

provided

Audio

Research Corporation. This warranty

subject to the

conditions

and

limitations

stated

within the

documents

attached to the outer

shipping carton.

LIMITED

3-YEAR

WARRANTY

A 3-Year Limited

Warranty

Application

included with the

documents

attached

to the outer shipping carton.

THIS

LIMITED

3-YEAR

WARRANTY

WILL

NOT

ISSUED

EFFECTIVE

UNLESS

WITHIN

THIRTY

DAYS

AFTER

THE

DATE

SALE

THE

PURCHASER

MAILS

AUDIO

RESEARCH

LIMITED

3-YEAR

WARRANTY

APPLICATION

FORM

WHICH

HAS

BEEN

COMPLETED,

DATED

AND

SIGNED

BOTH

THE

SELLING

DEALER

AND

THE

PURCHASER

AND

COPY

THE

BILL

SALE

OTHER

PROOF

PURCHASE

THE

PRODUCT.

WARNING

FAILURE

COMPLY

WITH

THE

ABOVE

CONDITIONS

WILL

RESULT

THE

WARRANTY

BEING

RESTRICTED

THE

LIMITED

90-DAY

WARRANTY.

PACKAGING

Save

All

The

Packaging -

Your

Audio

Research

component

a prec1s1on

electronic

instrument

and

should

properly cartoned

any

time shipment

made.

You

may

never

have

occasion to return

to the factory for

service,

but

such

should

necessary, or other occasion to ship

occurs, the original packaging

may

save your investment

from

unnecessary

damage

or delay.

-1

ACCESSORIES

The

following optional

(*)

accessories

for

your

-5 preamplifier will

made

available

through your

Audio

Research

dealer:

Walnut

veneered

oiled

finish

cabinet

* Programable

low

level

head

amp

electronics

LINE

VOLTAGE

CONVERSION

This equipment

can

operated

from

either

120

Volts

240

Volts A.C.,

50/60

Hz.

Check

the

position

the

line

voltage

selector

switch

the

rear

panel.

necessary,

remove

the switch

safety

cover

and

set

the switch to

the proper voltage as indicated

below

the switch. Secure the switch

position

with the

safety

cover

and

screws with the

word

fuse

showing. Ins

the

appropriate fuse as indicated

below

the

line

voltage

different

than

that

set

for

the

factory.

WARNING

Voltage

120

240

Fuse

1/4

Amp.

Type

3AG

MDL

Slo-Blo

1/8

Amp.

Type

3AG

MDL

Slo-Blo

prevent

fire

or shock hazard,

not expose

this

equipment to

rain

moisture.

This

unit

contains voltages

which

may

lethal.

not operate

this

unit

with covers

removed.

Refer servicing to

qualified

personnel.

CAUTION

For

continued protection

against

fire

hazard, replace only with

same

type

and

rating

fuse .

-2-

Jl J3

J11

J13

J15

J17 on

OT2

OT3

l= l I I

L1=LL

RIGHT

INPUTS r

RIGHT

OUTPUTS 1

....

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LEFT INPUTS L LEFT OUTPUTS

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AIAL

NUMIIEA

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,8l0

Jl0

Jl2

J14

J16 J18

REAR

PANEL

LAYOUT

REAR

PANEL

FUNCTIONS

Refer to the

Rear

Panel

Layout"

diagram above.

Audio

Inputs:

Jl -

Head

Amp*

(optional),

Right

Channel

Head

Amp*

(optional),

Left

Channel

Provision for

optional

Head

Amp

electronics

have

been

made

within the

SP-5

directly

behind the

Head

Amp

input connectors.

These

inputs

and

associated

electronics

will

required only for

low

output

moving

coil

transducers. Consult your dealer for information

and

use

this

special

input feature.

These

inputs are not connected

internally

the factory

and

are not

used

in systems

employing

moderate or

high

output magnetic

cartridges.

Phono,

Right

Channel

Phono,

Left

Channel

Connect

to tone

arm

/car

tridge

or record player.

Nominal

input

impedance

47K

ohms

and

200

shunt.

Use

with magnetic type cartridges requiring

RIAA

playback compensation.

Note:

Normally

connect grounding wire

from

record

player or

arm

to the

Ground

Terminal

screw located next to

and

between

and

J2.

With

certain

systems

this

may

add

hum

which

case

ground

wire

required.

Note:

The

input

characteristics

and

gain of the

SP-5

have

been

factory

set

accommodate

most

the high

quality

magnetic cartridges

·the market

today.

However,

the

SP-5

phono

section

can

altered

a technician for

different

(gain),

input

resistance

(R),

and

capacitance

(C)

shown

in the

schematic

gram

the

back

of the

manua

1. This feature a

ows

''matchi

various

cartridges

to the magnetic

preamp

section for

optimum

performance.

Consult your dealer for

further

information

and

use of

this

special input

feature.

-Tape, Right

Channel

-Tape, Left

Channel

High

level inputs.

Connect

to tape recorder

line

outputs.

Nominal

input

impedance

47K

in the

stereo

reverse

mode

30K

in the "l

eft

" or

right"

mode,

and

20K

in the

"mono"

mode.

The

input

impedance

shunted

any

load connected to the tape outputs

Jl5

and

Jl6

-3-

Tuner

, Right

Channel

J8 -Tuner, Left

Channel

High

level inputs.

Connect

to the output

and/or

tuner

component.

Nominal

input

impedance

47K

in the

stereo

reverse

mode,

30K

in the

left

right

mode,

and

20K

in the

mono

mode.

The

input

impedance

shunted

any

load connected to the tape outputs

J15

and

Jl6

Aux.

1, Right

Channel

JlO

Aux.

1, Left

Channel

Provides high level inputs for

any

auxiliary

system

component

Nominal

input

impedance

the

same

as the "tuner" inputs

and

above.

Jll

-Aux.2, Right

Channel

J12

-Aux.2, Left

Channel

Same

above.

Allows

use

of a second

auxiliary

component.

Jl3

-Monitor, Right

Channel

J14

-Monitor, Left

Channel

High

level inputs.

Connect

to tape monitor

main

outputs

tape recorder

tape monitoring feature

desired. Permits tape monitoring during

recording

from

front panel toggle switch (S2).

tape playback only

required, connect the tape recorder outputs to the tape inputs (JS

and

J6)

which

will instead

selected

"source" switch (S4).

Audio

Outputs:

J15

-Tape, Right

Channel

Jl6

-Tape, Left

Channel

Connect

to tape recorder

line

inputs. Provides a

program

source for tape

recording. Output signal

independent

"volume"

control

setting

and

equal to the source input

level,

i .e.

tape

tuner

aux

. l

aux

. 2

magnetic

phono

preamplifier output.

Nominal

output

impedance

ohms

plus the output

impedance

of the selected source.

general. the load

impedance

should

greater

than

20K

for

optimum

performance.

J17

Main,

Right

Channel

J18

Main,

Left

Channel

Connect

power

amplifier (or

electronic

crossover) inputs.

Nominal

output

impedance

ohms.

general, the load

impedance

should

greater

than

lOK

for

optimum

performance.

The

outputs are

coupled through a 5

capacitor.

-4-

Power

Circuits:

OTl

-Switched

Convenience Outlet

OT2

-Switched

Convenience Outlet

OT3

-Switched

Convenience Outlet

Connect

to system

components

{power

amplifier(s),

tuner(s),

electronic

crossover,

etc.)

that

are to

turned

the

front

panel

power

switch

(Sl).

Will

accept 2 or 3

prong

line

plugs. Outlets are switched

internal

power

relay. Capacity

1600

watts

total

including the

unswitched

outlet

(OT4)

The

outlets

are not fuse protected.

Note:

internal

.01

MF/1600

Vcapacitor

connected

(for

arc

suppression) across the internal

power

relay contacts .

Audio

Research

RPR-1

(Remote

Power

Receptacle)

used

in the system to

remotely turn

the

power

amplifier(s),

the

.01

capacitor

must

removed

The

small

current passed

the capacitor

sufficient

to turn-

the

RPR

-1

transmitter

electronics

continuously

even

with the

SP-5

power

switch (Sl)

off

Since relay contact arcing

not a

problem

when

using the

RPR-1

(power

amplifiers are instead connected to the

RPR-1

outlets),

this

capacitor

can

safely

removed.

accomplish

this,

remove

the

-5 top cover

and

8 holding screws.

CAUTION:

UNPLUG

SP-5

POWER

CORD

BEFORE

REMOVING

TOP

COVER

AND

CAPACITOR.

Locate the

.01

MF/1600

V capacitor nested

between

the

power

relay contacts -towards the

rear

panel

next to the

power

transformer. Clip the leads

off

close to the solder

joints,

remove

the capacitor,

and

replace the top cover.

The

-5

now

ready for use

with

RPR-1

OT4

Unswitched

Convenience Outlet

Connect

to record player,

turntable.

tape recorder

where

power

should

controlled

the

component

off

switch only . This insures proper

cycling

and

mechanism

disengagement.

Note:

The

grounding

type convenience

outlets

are provided to

accommodate

power

amplifiers with 3

prong

{grounded)

line

plugs.

avoid

system

ground

loops, the

ground

circuits

the

rear

panel

outlets

are connected

to the

ground

conductor of the

-5

line

cord only.

The

preamplifier

chassis~

not connected to the convenience

outlet

line

cord/plug

ground

circuit.

-Preamplifier

Line

Fuse

Receptacle

Provides protection for preamplifier

electronics

only. Refer to

page

for fuse replaceme

information.

Line

Voltage Selector Switch

Selects for

120

240

volt input

power.

Refer to

page

2 for

Line

Voltage Conversion

procedure.

- 5-

SYSTEM

CONN

CTION

Before connecting the

-5

into

your system,

familiarize

yourself with the

rear

panel functions

referring

to the diagram

and

description

the

rear

panel in

the previous section.

Use

only high quality shielded

phono

cables

when

interconnecting the

-5 with

any

signal sources,

power

amplifiers, or

electronic

crossovers.

Avoid

inexpensive

cables

which

use

"weak"

soft

metal

grounding

shells

as they

may

introduce

hum

and/or noise into the system.

Keep

audio cables neatly dressed

and

away

from

all

power

cords for

minimum

hum

and

noise

interference

should

noted

that

the

-5

line

cord grounds the convenience

outlet

grounds

only.

The

preamplifier chassis

not connected to the

line

cord

ground

in order

to minimize system

ground

loops .

-6-

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FRONT

PANEL

LAYOUT

FRONT

PANEL

FUNCTIONS

Refer to the "Front

Panel

Layout"

diagram above.

Rotary Controls:

Volume

(

Rl)

-Controls preamplifier "

main

output" level .

Power

amplifier or

source gain controls

(if

available) should

set

such

that

normal

listening

levels occur

approximately

or 2 o'clock

setting.

This will provide ideal

volume

control

"resolution".

Balance

(R2

) - Controls the

relative

volume

of each channel.

Equal

channel

volume

occurs

when

the control

centered

the

indicator

mark.

Clockwise

rotation

from

center position decreases

left

channel

output. Counter-clockwise

rotation

decreases

right

channel

output.

Rotary Switches:

Mode

(

) - Switch

selects

one

of five

"main

output"

modes

"Mono"

Combines

the

left

and

right

input channels

internally

to provide a

monaural

output

(common

output for both

left

and

right

main

outputs) .

"Reverse" - Provides stereophonic operation except channels are

reversed, i .e.

left

input to

right

output,

right

input to

left

output.

"Stereo" -Provides

normal

stereophonic operation without channel

reversal,

i .e.

left

input to

left

output,

right

input to

right

output.

''Left" -Left channel input sources are coupled to both the

left

and

right

"main

outputs" simultaneously.

The

"balance" control

functions

normal.

- 7-

"Right" -

Same

above

except

right

channel

inpu

t sources are

coupled to both the

left

and

right

"main

outputs" simultaneously.

Note:

The

"tape outputs" are unaffected

the position of the

mode

switch.

Source

(S4)

-Switch

selects

one

of five

rear

panel inputs

(program

sources)

marked.

The

selected source

also switched to the "tape

outputs" .

All

unused

inputs are shorted to ground.

Note:

Provisions for optional

(*)

Head

Amp

electronics

have

been

made

within the

-5

directly

behind the

Head

Amp

input

connectors .

These

inputs

and

associated

electronics

will

required only for

low

output

moving

coil transducers. Consult

your dealer for information

and

use

this

special input

feature.

These

inputs are not connected

internally

the

factory

and

are not

used

in systems employing moderate or high

output magnetic

cartridges.

Toggle Switches:

Power

(Sl) -Preamplifier on-off switch.

Move

handle

for

power

•

Also

turns

the "switched"

rear

panel

outlets.

Green

indicator

(LED)

illuminates

when

preamplifier

on.

Monitor

(S2)

Allows

instantaneous monitoring

tape recordings (inputs

Jl3

and

Jl4)

in the "monitor" position.

the "source"

position,

selector

switch

(S4)

controls the

program

source to the loudspeaker. Source

switch

(S4)

bypassed

when

(S2)

in the "monitor" position.

Indicator:

LED

Green

light

emitting diode. Illuminates

when

preamplifier

power

switch, Sl ,

•

-8-

GENERAL

OPERATION

Before operating,

familiarize

yourself

with the

front

panel control functions

referring

to the diagram

and

control description in the previous section.

operate your

music

system proceed as follows:

Set

"volume"

control

minimum

(full

counter-clockwise),

Turn

power

switch

"on"

-green

LED

ndi

tor

should i

umi

nate.

Note

: A controlled

warm

(10

second nominal)

initiated

power

turn-

on.

This minimizes

warm

pulses or

thumps

that

would

otherwise

heard through the speaker system.

Turn

desired source (record player, tuner, tape recorder,

etc.).

4. Set

source

switch to

program

source desired,

mode

switch to

"stereo",

"balance" control

o'clock

position,

and

the monitor toggle switch

to the

right

of the

power

sv,itch in a

down

position.

Turn

"volume"

control clockwise to desired

listeninq

level.

The

tape monitor switch allows a recording monitor function for

one

recorder.

The

normal

position

down

when

a tape recorder

not in use.

Refer to the previous section for a detailed description

and

operation of

the

front

panel

controls.

-9-

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