Dual 1009 F User manual

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1

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OWNER’S

MANUAL

DUAL

1009

F

AUTO/PROFESSIONAL

TURNTABLE

OPER

ATING

Needless

to

say,

we

are

delighted

that

you

have

chosen

the

Dual

1009F.

Now,

like

most

new

owners,

you

are

probably

eager

to

get

set

up

and

i

N

STR

U

Cri

Oo

N

Ss

play

your

first

record.

This

won’t

take

long,

but

it

is

important

that

you

read

the

installation

instructions

carefully

(on

the

inside

of

this

flap).

We

also

suggest

you

familiarize

yourself

with

the

1009F’s

many

operating

features

as

described

on

the

following

pages.

Each

of

them

is

a

typical

example

of

Dual’s

advanced

technology.

Pleasant

listening!

Master

Operating

Switch

This

one

feather-

touch

slide

switch

controls

all

operat-

ing

functions,

in

both

single

play

and

changer

operation,

as

described

below.

For

automatic

start,

you

move

it

past

STOP

to

START:

For

automatic

stop,

move

it

to

stop,

To

start

the

platter

rotating

without

putting

the

tonearm

into

cycle,

move

to

MANUAL

after

lift-

ing

tonearm

frdm

resting

post

and

moving

it

toward

the

center.

Preparations

for

Play

Select

the

correct

speed

and

record

indexing

size

for

the

record

to

be

played,

then

insert

either

the

short

spindle

(for

single

play)

or

the

Elevator-

Action

spindle

(for

changer

operation).

Single

Play

1.

Automatic

Start:

move

the

slide

switch

to

START.

2.

Automatic

Start

with

Cue-Control.

First

move

Cue-Control

to

position

‘W,

then

move

slide

switch

to

sTaRT.

(This

provides

an

even

more

gradual

tonearm

descent,

as

sometimes

preferred

for

ultra

high

compliance

cartridges.)

3.

Manual

Start

(on

rotating

record):

a.

Lift

tonearm

and

move

switch

to

MANUAL.

(This

can

easily

be

done

with

one

hand

as

shown.)

b.

Place

tonearm

on

record.

4,

Manual

Start

(on

motionless

record):

a.

Place

tonearm

on

record.

b.

Move

switch

to

MANUAL.

5.

Cue-Control

Start

(on

rotating

record):

a.

Move

Cue-Control

to

position

W.

b.

Place

tonearm

over

lead-in

groove

(or

over

any

other

groove).

c.

Move

switch

to

MANUAL.

d.

Flick

Cue-Control

to

position

W.

6.

Cue-Control

Start

(on

motionless

record):

Same

as

5,

but

reverse

steps

d

and

c.

7.

To

stop

play:

(tonearm

returns

to

rest,

motor

shuts

off)

Push

to

stop.

8.

To

interrupt

play

and

replay

from

beginning:

Push

gently

to

stop,

pause,

then

continue

to

START.

9.

To

interrupt

play:

(when

play

is

to

be

resumed

where

interrupted).

Move

Cue-Control

to

position

W.

10.

To

resume

play:

Flick

Cue-Control

to

position

W.

NotE:

at

the

end

of

play,

the

tonearm

will

return

to

its

resting

post

and

the

entire

machine

will

shut

off

automatically.

Automatic

Changer

Operation

Insert

the

changer

co

es

spindle

by

placing

i

the

key

at

its

base

into

the

slot

of

the

shaft.

Then

turn

the

spindle

clockwise

until

it

stops.

Up

to

ten

records

can

be

placed

on

the

spindle.

All

the

functions

for

single

play,

as

described

above,

are

exactly

the

same

in

changer

operation,

plus

these

additional

functions:

1.

To

reject

a

record

during

play

and

change

to

the

next

record

on

the

spindle:

Push

gently

to

stop,

pause,

then

continue

to

START.

2.

To

skip

the

next

record

on

the

spindle:

Push

to

stop.

After

that

record

drops,

push

to

START

and

the

next

record

will

drop.

Note:

Any

record

already

on

the

platter,

can

be

replayed

either

automatically

or

manually,

just

as

with

the

single

play

spindle.

If

there

are

any

rec-

ords

on

top

of

the

one

you

wish

to

replay,

simply

lift

them

back

onto

the

platform

or

off

the

spindle.

(The

3-pronged

platform

will

retract

into

the

spin-

dle

as

the

records

slip

past.)

No

need

to

remove

the

spindle

itself.

Jamproof

Tonearm

During

either

single

play

or

changer

operation,

the

tonearm

can

be

lifted

from

the

record,

moved

and

placed

down

again

either

by

hand

or

by

the

Cue-Control.

The

tonearm

may

even

be

restrained

during

cycling

without

causing

any

malfunction

. . .

thanks

to

its

foolproof

slip-clutch.

Open

flap

for

Installation

Instructions

INSTALLATION

INSTRUCTIONS

Installation

on

Base

or

Mounting

Board*

Required

dimensions:

12%"

width;

1142“

depth

(including

1”

for

rear

overhang

of

tonearm).

642”

height

above

base,

3”

below.

These

ingeniously

designed

mounting

screws

make

it

possible

to

install

and

remove

your

Dual

from

either

base

or

mounting

board

entirely

from

the

top.

There’s

no

need

to

fumble

underneath

or

to

take

anything

apart.

1.

Position

the

chassis

over

the

base

so

that

the

three

cupped

spring-mounted

footings

will

fit

into

their

cut-outs.

(The

notch

on

the

base

for

the

rear

top/mount

spring

screw

will

then

be

at

the

upper

left.)

Tilt

both

mounting

screws

to

let

them

slip

past

the

notches

as

you

lower

the

chassis.

(Fig.

5A)

2.

Turn

each

screw

clockwise

until

it

is

firmly

seated

into

the

top

of

the

chassis.

(Fig.

5B)

That’s

all

there

is

to

it.

To

remove

the

Dual,

simply

re-

verse

the

above

procedure.

To

Transport

the

Dual

Without

Demounting

1.

Loosen

both

top/mount

spring

screws,

depress

the

chassis

against

the

base,

then

continue

to

turn

each

screw

counter-clockwise

until

it

stops.

The

chassis

will

then

be

locked

firmly

against

the

base.

(Fig.

5C)

2.

To

avoid

possible

damage

to

the

platter

bearings

in

transit,

insert

the

plastic

wedges

(supplied

in

the

accessory

bag)

between

the

platter

and

chassis.

Position

the

wedges

at

equal

distances

for

maxi-

mum

support.

Or

you

can

remove.the

platter

from

the

chassis

(See

below).

With

the

chassis

now

on

its

base,

slowly

and

gently

lower

the

platter

onto

the

shaft.

The

oiled

felt

plug

in

the

center

hole

will

lubricate

the

shaft

as

it

is

forced

out,

and

it

may

then

be

discarded.

The

platter

can

be

secured

to

the

chassis

if

de-

sired,

by

the

spring-clip.

Use

the

special

accessory

cone

(supplied

in

hardware

bag)

to

press

the

spring-clip

down.

As

shown

in

fig.

25,

a

coin

makes

this

easy.

(The

same

cone

is

used

to

re-

move

the

spring-clip

as

shown

in

fig.

26.)

Finally,

insert

the

decorative

round

disc

under

each

of

the

three

lips

on

the

mat.

Mounting

the

Cartridge*

Note:

Any

cartridge

weighing

between

1

and

8

grams

and

meeting

standard

U.S.

mounting

specifications

can

be

used

with

the

Dual

1009F.

For

cartridges

weighing

up

to

13

grams,

order

special

counterbalance

shaft

12L-U118.

1.

Release

the

cartridge

holder

from

the

tonearm

head

by

pressing

the

tonearm

lift

a

short

turn

to

the

rear.

Be

ready

to

catch

the

holder,

as

it

will

drop

right

into

your

hand

(Fig.

10).

2.

The

special

gauge

supplied

with

your

Dual,

when

snapped

onto

the

holder

as

shown

in

fig.

9,

will

indicate

the

correct

stylus

depth

for

the

cartridge

when

mounted.

(Be

sure

the

ridges

on

the

inside

of

the

gauge

walls

fit

into

the

cor-

responding

tracks

on

the

side

of

the

cartridge

holder.)

When

the

cartridge

is

mounted

at

the

correct

depth,

the

tip

of

the

stylus

will

protrude

slightly

into

the

notch

of

the

gauge.

(Use

the

necessary

spacers

and

screws

provided

in

the

accessory

bag.)

3.

The

specially

tapered

wedge,

also

supplied,

is

for

use

when

you

intend

to

play

single

records

either

exclusively

or

primarily.

(Fig.

8)

This

wedge

provides

the

optimum

15°

vertical

tracking

angle

when

one

record

is

on

the

platter.

(However,

even

without

the

wedge,

the

vertical

tracking

angle

will

still

be

well

within

standard

industry

tolerances

for

single

record

play.)

4,

Remove

the

gauge

when

actually

mounting

the

cartridge,

then

snap

it

on

again

—

carefully

—

to

check

stylus

overhang.

When

viewed

from

the

top

(Fig.

9.

),

the

stylus

should

be

centered

within

the

notch

of

the

gauge.

5.

Finally,

tighten

screws,

making

sure

cartridge

is

positioned

straight.

Note

dotted

line

in

fig.9.

6.

Connect

each

lead

on

the

cartridge

holder

to

its

corresponding

pin

on

the

cartridge.

Each

lead

is

color-

coded

as

shown

in

fig.

10.

7.

Attach

the

cartridge

holder

by

placing

it

against

the

tonearm

head

as

shown

in

Fig.

11,

lift

it

up

and

lock

it

by

pressing

the

tone-

arm

lift

forward.

fi)

Balancing

the

Tonearm

*

1.

With

the

tonearm

locked

and

the

stylus

force

scale

set

at

0,

screw

the

shaft

of

the

tonearm

coun-

terbalance

onto

the

rear

of

the

tonearm.

2.

Lock

the

tonearm

on

its

post,

push

the

operat-

ing

slide

switch

to

START,

then

rotate

the

platter

by

hand

two

or

three

times

to

be

sure

the

switch

is

in

“neutral”

(Fig.

1).

3.

Unlock

the

tonearm,

lift

it

off

the

rest

post,

and

rotate

the

counterbalance

until

the

tonearm

is

per-

fectly

balanced.

To

raise

the

tonearm

head,

rotate

the

counterbalance

clockwise

..

.

and

vice

versa.

The

tonearm

will

be

perfectly

balanced

when

edges

A

on

the

tonearm

head

and

B

on

the

resting

post

line

up

as

shown

in

Fig.

12.

As

a

further

confirma-

tion

of

perfect

tonearm

balance,

let

the

tone-

arm

float

freely,

then

tap

the

chassis

from

the

top.

The

tonearm

should

remain

hori-

zontal,

even

while

the

chassis

vibrates.

Perfect

tonearm

balance

is,

of

course,

especially

im-

portant

with

extremely

lightweight

tracking.

()

Note:

the

counterbalance

has

been

pre-set

at

a

mid-

Position

on

its

threads.

If

at

any

time

in

the

future,

you

find

it

too

close

to

either

end

of

the

shaft,

simply

rotate

it

in

the

opposite

direction

for

a

few

turns,

Then

resume

with

instruction

1.

Applying

Stylus

Force

Once

the

tonearm

is

balanced

at

zero,

you

simply

dial

‘the

stylus

force.

The

number

on

the

direct-

reading

dial

11]

is

accurate

to

within

0.1

gram.

The

instructions

accompanying

your

cartridge

will

give

you

the

range

of

minimum

and

maximum

tracking

forces

its

manufacturer

suggests.

As

the

tonearm

of

the

Dual

1009F

can

track

flaw-

lessly

as

low

as

%

gram,

the

only

limitations

on

tracking

are

those

imposed

by

the

cartridge

itself.

That

is

why

you

can

use

any

cartridge

you

prefer,

including

those

with

ultra-high

compliance

styli

not

ordinarily

recommended

for use

in

automatic

tonearms.

Applying

Tracking-Balance

Control

The

Dual

1009F

is

designed

to

provide

continu-

ously

variable

Tracking-Balance

Control.

(See

page

6

for

full

explanation.

)

To

apply

Tracking-Balance

Control

for the

track-

ing

force

you

have

set

for

your

cartridge,

simply

rotate

the

Tracking-Balance

dial

§AJ

to

the

same

number

as

on

the

stylus

force

dial.

Connection

to

Amplifier

(or

other

audio

equipment)

«The

red

phono

cable

is

for

the

left

channel,

the

yellow

cable

for

the

right

channel.

Connect

to

your

amplifier

or

other

audio

equipment

according

to

their

instructions.

Connection

to

Power

Supply

AC

voltage

and

line

frequency

(cycle)

require-

ments

are

indicated

on

both

the

outside

of

the

car-

ton

and

on

top

of

the

chassis

beneath

the

turntable

platter.

Check

before

connecting

to

power

supply.

Note

to

servicemen:

The

Dual

can

be

set

for

either

110

VAC

or

220

VAC.

It

can

also

be

used with

line

frequency

of

either

50

or

60

cycles.

The

60

cycle

pulley

is

Part

Number

12X-U

20;

the

50

cycle

pulley

is

Part

Number

12X-U

14.

Power

Control

for

Amplifier

Shut-Off

Your

Dual

1009F

is

equipped

with

a

unique

pro-

*Instructions

for

installing

on

base,

mounting

cartridge

and

balancing

tonearm

apply

for

Duals

purchased

as

separate

components.

If

your

Dual

is

already

mounted

within

a

console,

these

installation

procedures

have

already

been

made

for

you.

However,

reading

these

three

sections

will

help

familiarize

you

with

the

unit.

vision

for

controlling

the

power

to

the

amplifier,

so

that

the

entire

system

can

be

switched

on

and

off

automatically.

by

the

turntable.

To

take

advantage

of

this

special

feature

(which

handles

up

to

3

amps),

consult

your

Dual

dealer

or

a

qualified

serviceman,

in

accordance

with

UL

requirements.

Adjustment

for

Lead-In

Groove

The

Dual’s

tonearm

has

been

carefully

set

at

the

factory

to

set

down

accurately

in

the

lead-in

groove

during

automatic

start.

However,

the

dimensions

of

some

cartridges

may

cause

the

stylus

to

set

down

either

too

far

in

or

too

far

out.

In

such

cases,

the

necessary

adjustment

can

be

made

quite

simply

as

follows:

1.

Move

record-size

selector

switch

to

7”

position.

This

will

expose

the

adjustment

screw

through

the

opening

in

the

chassis

near

the

tonearm

post.

2.

If

the

stylus

had

touched

down

outside

the

lead-

in

grooves,

turn

the

screw

clockwise

(very

slightly).

If

the

stylus

had

touched

down

on

the

recorded

grooves,

turn

the

screw

counter-clockwise.

(Although

it

is

most

convenient

to

use

a

7”

record,

any

size

record

can

be

used

to

make

and

check

the

adjustment,

as

once

the

tonearm

has

been

cor-

rectly

set

for

one

size

record,

it

will

be

correct

for

all.

Just

be

sure

to

set

the

size

selector

switch

back

for

the

record

size

you're

using

if

you

don’t

have

a7”

record.)

Servicing

if

your

Dual

1009F

ever

requires

servicing,

either

take

it

to

your

Dual

audio

dealer,

or

ask

him

for

the

address

of

the

nearest

Authorized

Dual

Service

Station.

Be

sure

that

authentic

Dual

parts

are

used

whenever

replacement

is

neces-

sary.

Always

ship

the

Dual

in

its

original

packag-

ing,

or

if

it

has

been

discarded,

write

for

special

shipping

instructions.

Tonearm

Pause

5

Ledge

Adjustment

for

Tonearm

Indexing

Tonearm

Rest

(not

visible

Post

in

photo)

Auto/

Manual

8

|

Cue-Control

Tonearm

Lock

Record

Size

Selector

Master

2

|

7

|

Operating

Tonearm

Lift

Switch

and

Cartridge

Pitch

37

Holder

Lock

Control

Top/Mount

3

|

Spring

Screw

Cartridge

Holder

Counterbalance

Shaft

Direct

Dia!

Stylus

Force

Adjust

Tonearm

Counterbalance

Speed

Selector

Tracking-Balance

Control

DUAL

1009F

AUTO/PROFESSIONAL

15

16

TURNTABLE

Spindle

single

Ply

pring

Sere

Spindle

Spring

Screw

DUAL

1009F

PRECISION

DESIGN

AND

ENGINEERING

FEATURES

CONTINUOUSLY

VARIABLE,

DIRECT-DIAL

TRACKING-BALANCE

CONTROL™

CAnti-Skating)

What

You

Should

Know

About

Skating

Skating

refers

to

the

side-thrust

imparted

to

the

stylus

from

the

offset

angle

of

the

tonearm

head

and

the

friction

between

the

stylus

and

the

rotat-

ing

record.

This

causes

the

stylus

to

“skate”

toward

the

center

of

the

record,

thus

causing

increased

force

against

the

inner

groove

and

correspondingly

less

force

against

the

outer

groove.

This

results

in

distortion,

increased

wear

on

the

inner

groove

and

uneven

wear

on

the

stylus

itself.

Skating

is

actually

not

a

serious

problem

with

ordinary

tonearms,

as

their

bearing

friction

in

the

pivot

is

generally

high

enough

to

cancel

out

or

minimize

the

tendency

to

skate.

Of

course,

bearing

friction

high

enough

to

prevent

skating

is

also

high

enough

to

compromise

tracking

performance

at

the

ultra-lightweight

forces

now

made

possible

by

today’s

finest

high

compliance

cartridges.

Actual

Forces

Present

at

Stylus

Point

(13)

K

—

theoretical

force

against

Sk

—

skating

force

tonearm

bearing

if

head

=

4

_

angle

of

offset

were

not

angled

head

Z

—

direction

of

force

against

tonearm

bearing

because

of

angled

head

tonearm

bearing

The

amount

of

skating

force

is

directly

measur-

able,

and

amounts

to

about

12%

of

tracking

force.

Fig.

13

illustrates

the

physical

principle

behind

skating

and

the

forces

that

cause

it.

A

tonearm

with

2

gram

tracking

force

will

thus

have

a

potential

skating

force

of

.24

grams.

We

say

potential,

since,

as

noted

above,

if

a

tonearm’s

bearing

friction

is

above

.24

gram,

it

won't

skate.

The

bearing

friction

of

the

Dual

1009F

tonearm,

on

the

other

hand,

is

lower

than

0.04

gram.

Thus,

Tracking-Balance

Control

of

the

same

high

order

of

precision—and

with

continuously

variable

con-

trol—was

one

of

the

major

goals

and

achievements

of

the

1009F’s

design.

Applying

Tracking-Balance

Control

Just

as

you

set

stylus

force

on

the

Dual

with

a

continuously

variable

direct-reading

dial,

so

do

you

set

Tracking-Balance

Control

for

that

same

force

(Fig.

14).

Tracking-Balance

Control

for

Stylus

Radii

(in

mils)

As

shown

by

the

bold-face

numerals

in

the

chart,

Tracking-Balance

Control

is

calibrated

for the

most

commonly

used

round

stylus

radius

(0.6

mil).

This

calibration

is

also

sufficiently

accurate

for

other

stylus

radii

as

well.

What’s

more,

for the

perfectionist

who

wishes

to

take

the

fullest

possible

advantage

of

the

precision

Tracking-Balance

Control

now

made

possible,

the

other

columns

indicate

the

adjustment

to

be

made

for

other

radii

from

0.4

mil

to

0.8

mil,

as

well

as

the

elliptical

stylus

(0.2

mil

x

0.9

mil).

This

means

that

for

the

first

time

you

can

actually

balance

stylus

force

on

both

walls

of

the

stereo

groove!

All

this

is

one

more

example

of

how

Dual

assures

you

of

the

best

possible

performance

from

any

cartridge/stylus

combination.

ft)

.

4

Direction

of

=

;

Skating

Force

a

e

a

4

Tracking-Balance

Direction

of

Control

Skating

Force

These

illustrations

show

how

Tracking-Balance

Control

is

applied

within

the

tonearm

system

of

the

Dual

1009F.

(A)

No

Tracking-Balance

Con-

trol

applied.

(B)

Tracking-Balance

Control

applied

by

special

non-fatiguing

spring.

Tonearm

in

rest

position.

(C)

Tonearm

now

in

extreme

center

posi-

tion.

Though

spring

is

extended,

Tracking-Balance

Control

remains

constant

through

the

entire

area

of

tonearm

travel,

due

to

angle

which

correspond-

ingly

reduces

pull

of

the

spring.

AUTO/MANUAL

CUE-CONTROL"™

Precise

Stylus-to-Groove

Cueing

With

the

Auto/Manual

Cue-Control,

still

another

measure

of

flexibility

and

precision

has

been

added

to

the

unrestricted

automatic

and

manual

play

that

has

long

been

available

in

all

Dual

automatic

turn-

tables.

The

Cue-Control

makes

it

possible

to

pre-position

the

stylus

over

any

groove

and

then

lower

it

more

smoothly

and

gently

than

would

be

possible

by

hand.

You

can

also

play

to

any

point,

interrupt

with

the

Cue-Control,

and

resume

play

where

you

left

off.

A

close

look

at

the

stylus

as

it

descends

will

show

how

the

vertical

piston

action

of

the

Cue-Control

mechanism

lowers

the

tonearm

with

no

side-shift

whatever,

regardless

of

portion

of

the

record

being

played.

You

will

also

notice

how

the

silicon

damping

slows

the

descent

of

the

tonearm

.

. .

a

far

more

gentle

descent

than

would

ever

be

possible

by

hand.

Using

the

Cue-Control

The

Cue-Control

has

two

positions:

YW

to

lift

the

tonearm,

and

‘W

for

lowering

it.

(Fig.

16)

To

lower

the

tonearm

to

any

groove,

you

need

give

only

the

lightest

flick

to

the

Cue-Control.

The

descent

of

the

tonearm

is

immediately

taken

over

by

silicon

damping

and

a

piston

action.

Lowering

speed

is

0.5

cm/second,

and

is

unaffected

by

tem-

perature

or

humidity

changes.

To

raise

the

tonearm,

on

the

other

hand,

you

do

control

the

rate

of

ascent

by

the

speed

with

which

you

move

the

Cue-Control

from

position

VW

to

position

W,

With

Automatic

Start

Too!

The

Cue-Control

can

also

be

used

together

with

automatic

start

for

a

slower-than-normal

rate

of

descent,

as

may

be

desired

with

ultra-high

compli-

ance

styli.

Once

the

cycling

action

has

placed

the

tonearm

over

the

lead-in

groove

and

it

begins

to

descend,

then

Cue-Control

takes

over.

The

Cue-

Control

itself

is

automatically

shifted

to

position

XW,

where

it

is

ready

to

raise

the

tonearm

at

any

time

during

play.

Cue-Control

is

shown

at

position

W,

with

tone-

arm

supported

by

piston

(A).

When

Cue-Control

is

shifted

to

position

WW,

the

piston

is

released

and

permits

tonearm

to

slowly

lower

to

record.

At

this

point,

the

tonearm

is

completely

disen-

gaged

from

the

Cue-Control.

DUAL

100SF

PRECISION

DESIGN

AND

ENGINEERING

FEATURES

DYNAMICALLY

BALANCED

TONEARM

WITH

DIRECT-DIAL

STYLUS

FORCE

ADJUST

Flawless

Tracking

as

Low

as

1/2

Gram

Not

all

so-called

“dynamically

balanced”

tonearms

actually

measure

up

to

that

important

qualifica-

tion,

as

dynamic

balance

requires

that

the

tone-

arm’s

integral

mass

remain

balanced

at

all

times

when

tracking.

This

tonearm

main-

tains

its

true

dy-

namic

balance

in

all

planes

because

tracking

force

is

ap-

plied

at

the

pivot

point

by

along,

mul-

tiple-coiled

main-

spring

(Fig.

18A).

The

weight

of

the

tonearm

itself

re-

mains

in

constant

balance.

Friction-Free

Pivots

The

Dual

1009F’s

tonearm

pivot

is

virtually

friction-free

(less

than

0.04

gram)

in

both

vertical

and

horizontal

planes.

For

its

vertical

movement,

the

tonearm

is

pivoted

on

two

hardened

steel

points,

each

supported

by

precision

ball

bearings.

(Fig.

18)

In

the

horizontal

movement,

double

ball

bearing

units

are

used.

(Fig.

18C)

Direct-Dial

Stylus

Force

Tracking

force

is

applied

with

the

same

order

of

precision

as

used

in

balancing

the

tonearm.

The

continuously

variable

adjustment

(from

0

grams

up)

is

also

essential

with

ultra-lightweight

track-

ing.

The

readings

on

the

dial

(Fig.19)

are

accurate

to

within

0.1

gram.

“At-Home”

Demonstration

of

Tonearm

Balance,

Tracking

and

Low

Bearing

Friction

Among

the

final

“torture”

tests

that

each

Dual

1009F

must

pass

at

the

factory

are

some

which

you

can

easily

duplicate

at

home.

We

believe

that

you

will

find

them

both

interesting

and

impressive

demonstrations

of

the

precision

tracking

possible

with

this

truly

remarkable

instrument.

Featherlight

Tripping

The

tripping

action

is

accomplished

by

a

light-

weight

glider

which

rides

freely

on

a

ball

bearing

toward

the

center

as

the

tonearm

approaches

the

run-out

grooves.

When

the

stylus

reaches

these

grooves,

the

glider

is

brought

into

featherlight

con-

tact

with

the

free-suspension

trip

switch,

and

the

automatic

trip

immediately

takes

over.

Less

than

0.4

gram

force

is

sufficient

to

activate

the

switch.

Tripping

at

/2

Gram

If

you

have

a

high

compliance

cartridge

and

a

new

record

with

smooth

run-out

grooves

you

can

witness

the

phenomenon

of

a

tonearm

actually

tripping

at

%

gram!

Just

set

the

stylus

force

scale

accordingly,

and

place

the

tonearm

on

the

rec-

ord

near

the

center,

just

outside

the

run-out

groove.

Then

press

the

slide

switch

to

MANUAL

and

watch

the

effortless

tripping

performance,

Tripping

at

“Zero”

Try

this

also.

With

the

stylus

force

scale

set

at

0,

allow

the

tonearm

to

float

over

the

record

in

mid-

air.

Push

to

MANUAL

to

rotate

the

record,

then

blow

gently

on

the

tonearm

from

the

side

.

. .

just

enough

to

ease

it

toward

the

center.(Fig.20)

As

your

breath

alone

moves

the

tonearm,

it

will

again

trip

and

then

float

gently

back.

(Because

it

is

set

at

0

tracking

force,

the

tonearm

will

not

descend

to

its

resting

post.

So

be

sure

to

restore

the

normal

tracking

force

for

your

cartridge.)

Tonearm

Balance

With

a

12”

33-rpm

record

on

the

platter

and

the

stylus

force

set

at

1

gram,

prop

the

Dual

up

as

shown

in

Fig.

21*

at

any

angle

up

to

60°.

When

you

push

to

START,

the

tonearm

will

index

and

track

flawlessly,

as

a

demonstration

of

its

perfect

balance

in

all

planes.

(While

tracking,

the

Dual

can

be

tilted

even

further

to

almost

90°.)

Vertical

and

Horizontal

Movement

Now,

without

tilting

the

Dual

itself,

place

a

ciga-

rette

or

short

pencil

between

the

record

and

platter

to

simulate

the

effect

of

a

badly

warped

record.

Again,

the

tonearm

will

track

flawlessly,

this

time

as

a

demonstration

of

the

low

friction

in

the

vertical

pivot.

*You

can

actually

tilt

the

Dual from

any

side

except

the

right,

as

the

free

action

of

the

trip

switch

would

then

cause

it

to

be

activated

at

about

20°

tilt.

Needless

to

say,

the

Dual

requires

no

leveling.

Finally,

for

the

“piece

de

resistance,”

test

for

low

friction

in

the

horizontal

pivot.

To

do

this,

place

a

large-hole

7”

record

on

the

platter,

but

off

center.

(Fig.

22)

Place

the

tonearm

on

the

lead-in

groove

and

push

to

MANUAL.

The

sight

of

the

tonearm

swaying

back

and

forth

while

tracking

is

indeed

startling.

ACOUSTIC

FEEDBACK

ELIMINATED

The

only

vibrations

induced

upon

the

stylus

should

be

those

originating

from

the

recorded

grooves.

Any

others,

such

as

those

present

in

the

speakers,

must

be

isolated

from

the

stylus,

or

it

will

repeat-

edly

transmit

those

spurious

signals

throughout

the

system

—

as

“acoustic

feed-

back.”

Dual

has

taken

extra-

ordinary

care

in

elimi-

nating

anything

that

would

tend

to

induce

acoustic

feedback,

For

example,

the

spring-mounted

foot-

ings

(Fig.

23)

are

internally

cushioned

with

rubber

between

spring

and

caps.

Further,

the

springs

them-

selves

are

“soft,”

because

the

feathertouch

side-to-

side

action

of

the

operating

slide

switches-do

not

require

stiff

vertical

resistance.

The

tonearm

counterbalance

is

also

rubber-isolated

from

its

shaft,

as

you

will

notice

when

handling

it.

And

the

motor,

of

course,

is

thoroughly

insulated

against

both

shock

and

vibration.

These

are

some

of

the

“inside”

reasons

why

you

will

find

Dual

automatic

turntables

in

the

highest

quality

single-

cabinet

consoles

that

can

reproduce

the

full

fre-

quency

response

range

without

concern

for

acoustic

feedback.

POWERFUL,

CONSTANT

SPEED

CONTINUOUS-POLE™

MOTOR

‘oF,

Of

entirely

new

design,

the

Dual’s

powerful

and

utterly

quiet

Continuous-Pole™

high

torque

motor

effortlessly

brings

the

heavy

turntable

to

full

speed

virtually

instantaneously.

The

rotor

is

dynamically

balanced

in

both

planes.

Together

with

the

evenly

and

precisely

distributed

poles,

this

eliminates

at

the

source,

one

of

the

major

sources

of

rumble

and

assures

speed

constancy.

DUAL

100SF

PRECISION

DESIGN

AND

ENGINEERING

FEATURES

All

three

speeds

are

accurate

within

0.1%,

with

one

to

ten

records.

Further,

voltage

variations

can

ex-

ceed

+

10%

with

no

effect

on

speed

whatever!

Thus

the

Continuous-Pole

motor

combines

the

ad-

vantages

of

the

induction

and

synchronous

motors.

PITCH-CONTROL™

Each

of

the

three

standard

speeds

(

33,

45,

78

rpm)

can

be

varied

over

a

6%

range

with

the

ver-

nier

Pitch-Control(™),

This

opportunity

to

change

pitch

by

more

than

a

half

note

is

especially

valu-

able

to

serious

music

listeners,

students,

those

re-

cording

onto

tape,

and

every

perfectionist.

Wherever

you

set

the

Pitch-Control,

speed

will

remain

absolutely

constant.

(

You

can

check

it

your-

self

with

the

strobe

disc

supplied.)

How

the

Pitch-Control

Works

This

has

been

achieved

by

a

simple

and

foolproof

method

that

does

not

change

or

affect

motor

speed

or

power

in

any

way.

The

motor

drive

pulley

(A)

has

three

precisely

tapered

sections,

one

for

each

speed,

as

shown

in

Fig.

26.

The

idler

wheel

(B)

is

positioned

at

one

of

these

sections

by

the

speed

selector

switch,

[J

Then

the

idler

wheel

is

raised

and

lowered

along

the

section

by

the

Pitch-Control

BJ.

The

motor

drive

pulley

and

the

idler

wheel

disengage

automatically

after

play,

thus

prevent-

ing

any

possibility

of

flat

spots

developing

on

the

idler.

ELEVATOR

ACTION’

CHANGER

SPINDLE

The

Elevator-Action

changer

spindle,

which

holds

up

to

ten

records

offers

another

exclusive

Dual

fea-

ture

that

protects

your

records

against

any

possible

damage

such

as

may

occur

from

the

use

of

pusher

arm

mechanisms

or

offset

spindles.

Fig.

27

illustrates

the

four

steps

of

the

Elevator-

Action.

First,

the

entire

stack

rests

upon

a

three-

pronged

platform

(a).

When

the

slide

switch

is

pushed

to

sTaRT,

the

weight

of

the

entire

stack

is

lifted

off

the

bottom

record

(b),

which

is

then

re-

leased

to

descend

to

the

turntable

(c).

The

stack

now

lowers

(d)

to

await

the

next

change

cycle.

This

method

is

foolproof

with

all

records

that

con-

form

to

the

international

standards

of

the

record

Dual

Gebriider

Steidinger,

St.Georgen/Schwarzwald

industry

as

to

the

size

and

concentricity

of

the

center

hole.

(On

rare

occasions

when

a

record

does

not

drop

properly,

it

is

most

likely

due

to

excess

label

paper

extending

into

the

record

hole,

which

should

be

clean.)

Power

Control

for

Amplifier

Shut-off

Your

Dual

1009F

is

equipped

with

a

unique

pro-

vision

for

controlling

the

power

to

the

amplifier,

so

that

the

entire

system

can

be

switched

on

and

off

automatically

by

the

turntable.

To

take

ad-

vantage

of

this

special

feature

(which

handles

up

to

3

amps),

consult

your

Dual

dealer

or

a

qualified

serviceman,

in

accordance

with

UL

requirements.

When

used

with

a

receiver,

we

suggest

an

external

on-off

switch

be

included,

so

that

the

tuner

section

can

be

used

without

operating

the

turntable.

Servicing

If

your

Dual

1009F

ever

requires

servicing,

either

take

it

to

your

Dual

audio

dealer,

or

ask

him

for

the

address

of

the

nearest

Authorized

Dual

Service

Station.

Be

sure

that

authentic

Dual

parts

are

used

whenever

replacement

is

neces-

sary.

Always

ship

the

Dual

in

its

original

packag-

ing,

or

if

it

has

been

discarded,

write

for

special

shipping

instructions.

12X

-

D4

Printed

in

Germany