Teac A-100 - Page 6

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y

x.

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7

-

-------

u„.

Holder

Tray

to

insert

or

remove

the

cassette

tape.

Never

depress

the

EJECT

Key

during

a

Fast

Forward

or

Rewind

operation

as

this

may

damage

your

tape.

Also

never

try

to

depress

the

EJECT

Key

when

the

Play

Key

is

depressed

as

this

may

damage

your

deck.

Setting

the

recording

level

Due

to

the

thinness

of

the

base

material

and

the

oxide

coating

on

cassette

tapes,

the

setting

of

the

proper

recording

level

for

good

quality

recording

is

very

critical.

Cas



sette

tapes

are

easily

"saturated".

That

is,

a

large

signal

can

"over-magnetize"

the

tape.

This

results

in

a

poor

sounding

tape

with

the

high

frequencies

suppressed

or

a

lack

of

sufficient

dynamic

range

on

your

recording.

The

recording

will

sound

bad.

Music

that

is

recorded

at

too

low

a

level

may

be

buried

in

tape

hiss

or

produce

too

low

an

output

level.

Normally

a

cassette

tape

should

be

recorded

at

approximately

0

VU

on

the

VU

meters

for

the

louder

passages

of

a

song.

However,

if

you

record

music

at

this

level

and

the

recording

sounds

poor,

you

may

find

that

recording

at

a

slightly

lower

level

will

produce

better

fidelity

recordings.

If

you

reduce

the

recording

level

too

much,

the

signal-to-noise

ratio

may

suffer.

With

a

little

practice

you

will

be

able

to

select

that

critical

recording

level

that

gives

you

the

best

high

fidelity

recordings.

The

type

and

condition

of

the

tape

as

well

as

the

kind

of

music

you

are

recording

also

affects

the

optimim

setting

of

the

record

level.

ly

onto

the

left

reel

of

the

cassette.

This

will

move

the

tape

to

the

beginning

of

the

tape.

When

the

tape

is

completely

wound

onto

the

left

reel,

the

unique

end-stop

feature

of

the

A-100

will

automatically

release

the

Rewind

Key

and

stop

the

tape

movement.

Note

that

if

the

Rewind

Key

is

depressed

while

the

tape

is

already

rewound

onto

the

left

reel,

the

Rewind

Key

will

again

be

automatically

released

after

a

short

delay

of

3-6

seconds.

Play

Key

>

This

key

causes

the

tape

to

move

from

the

left

to

the

right

side

for

both

normal

Record

and

Playback

operation.

When

the

tape

reaches

the

end,

the

special

end-stop

feature

will

release

the

key

or

keys

that

were

depressed.

Fast

Forward

Keyk->

This

key

causes

the

tape

to

move

quickly

from

the

left

reel

to

the

right

reel

of

the

cassette

to

allow

you

to

by-pass

or

skip

over

portions

of

the

tape

that

you

don't

wish

to

record

or

play.

The

end-stop

feature

also

releases

this

key

when

the

end

of

tape

is

reached.

keys

and

de-activate

any

function

that

was

selected

except

PAUSE.

be

automatically

released

after

a

short

delay

of

3-6

seconds.

If

the

tape

is

already

at

the

end

of

tape

and

any

tape

movement

opera



tion

is

selected

that

would

move

the

tape

toward

the

end-stop,

the

end

stop

function

will

continually

release

the

selected

key

after

the

3

to

6

second

delay.

The

Pause

key,

if

selected,

will

not

be

released.

ing

or

playback.

When

the

clock

timer

reaches

the

pre-set

time,

power

will

be

applied

to

the

deck

and

the

PAUSE

Key

will

be

released

automatically

to

begin

the

desired

operation.

MIC

and

Headphones

Connections

Use

microphones

with

impedance

of

600

to

10,000

ohms

and

connect

them

to

the

MIC

Jacks.

Two

microphones

must

be

used

for

stereo

recording.

Low

impedance

mics

with

impedances

of

150

to

600

ohms

will

also

work

satisfactorily.

Connect

8

ohm

stereo

headphones

to

the

PHONES

Jack

to

listen

without

letting

others

hear.

deck,

it

is

advisable

to

somewhat

de



emphasize

the

treble

range

by

reducing

the

tone

control

on

your

amplifier.

The

Dolby

System

mentioned

in

this

manual

refers

to

B-Type

Dolby

System

unless

otherwise

indicated.

:coeo^Z

do

|b

y

/'[

Reference

/

j

Level

Direct

Function

Operation

This

deck

incorporates

direct

function

oper



ation

which

allows

you

to

go

directly

from

one

mode

to

another

without

depressing

the

Stop

key

to

release

the

previously

selected

function

keys.

You

can,

for

instance,

go

directly

from

Fast

Forward

>

>

or

Rewind

to

Play

or

Record

mode,

from

Rewind

to

Fast

Forward

or

almost

any

sequence

of

these

operations

you

wish.

However,

you

cannot

go

from

Play

mode

directly

to

Record

mode

because

there

is

a

record

interlock

which

requires

that

the

Record

key

be

depressed

prior

to

depressing

the

Play

key.

This

safety

feature

prevents

the

user

from

accidentally

depressing

the

Record

key

during

a

play

mode

and

thereby

erasing

a

good

tape.

You

must

depress

the

Stop

key

or

another

key

(except

Record)

to

release

the

Play

key

prior

to

selecting

the

Record

mode.

CAUTION:

Never

depress

the

Play

key

and

either

of

the

fast

motion

keys

(Fast

For



ward

or

Rewind)

at

the

same

time.

This

will

result

in

improper

tape

movement

and

possible

damage

to

your

cassette

tape.

Principle

and

Effects

of

the

Dolby

NR

System

The

principle

of

the

system

can

be

described

as

follows:

On

recording,

low

level

mid-high

frequencies

are

increased

in

amplitude

resulting

in

a

compression

on

the

program's

dynamic

range.

On

playback,

this

dynamic

range

is

expanded

so

that

the

same

signals

are

decreased

in

amplitude

to

their

original

level.

This

process

also

decreases

the

tape

hiss

noise

inherent

in

the

tape

recording

process.

Through

this

unique

manipulation,

the

tape

noise

and

hiss

are

reduced

below

normal

audibility.

In

the

frequency

range

of

1

kHz

or

higher

where

the

tape

hiss

and

noises

are

more

conspicuous,

the

B-type

Dolby

system

incorporated

in

the

deck

thus

can

reduce

such

noise

by

5

dB

at

1

kHz,

and

10

dB

at

about

5

kHz

or

higher

in

terms

of

S/N.

PAUSE

TIMER

Key

This

key

serves

two

functions

as

its

name

suggests.

First,

if

depressed

during

Record

or

Play

mode,

the

tape

movement

will

be

halted

due

to

the

pinch

roller

being

re



tracted

from

the

capstan

but

the

capstan

motor

will

continue

turning.

The

electronics

will

remain

in

the

previously

selected

state.

When

you

want

to

resume

tape

movement

just

depress

the

PAUSE

Key

and

release

it.

PAUSE

mode

can

also

be

used

to

set

the

RECORD

Level

Controls

prior

to

starting

actual

recording.

To

do

this

depress

PAUSE

Key,

depress

and

hold

down

REC

Key

and

then

depress

Play

Key.

REC

and

Play

Keys

will

both

lock

in

down

position

and

the

deck

will

be

in

REC

PAUSE

mode.

You

can

then

see

the

input

level

displayed

on

the

VU

Meters

and

set

the

RECORD

Level

Controls.

To

begin

the

recording

again

depress

and

release

the

PAUSE

Key.

The

PAUSE

Key

can

also

be

used

to

momentarily

stop

tape

whenever

you

want

to

stop

the

tape

without

releasing

the

selected

mode.

Mic

Recording

*

Plug

the

microphones

into

the

MIC

jacks

on

the

front

panel

of

the

deck.

Two

mics

must

be

used

for

stereo

(2

channel)

recording.

*

Set

the

Input

selector

switch

to

the

MIC/DIN

position.

*

Use

headphones

to

monitor

the

inputs

to

prevent

feedback

of

"howling"

that

might

occur

if

you

were

using

speakers.

*

Prior

to

actual

recording,

set

the

RECORD

level

controls

for

approxi



mately

0

Level

or

less

on

the

Level

meters

for

the

loudest

sounds.

*

Balance

the

sound

on

the

two

channels

by

adjusting

the

RECORD

Level

con



trols

and/or

by

repositioning

the

mics.

*

Follow

the

basic

recording

procedure

given

on

page

4.

End-Stop

Function

During

any

tape

movement,

when

the

cas



sette

tape

reaches

the

end

of

tape,

the

deck

will

stop

and

the

selected

key

or

keys

will

BIAS

and

EQ

Selector

Switches

Separate

2

position

BIAS

and

EQ

(equali



zation)

Switches

allow

you

to

set

these

two

parameters

independently

to

obtain

the

best

match

between

the

deck

and

the

tape

you

are

using.

See

the

chart

above

to

guide

you

to

the

proper

setting

for

the

tapes

listed.

The

user

may

wish

to

experiment

with

other

tapes

than

those

listed.

REC

Key

When

depressed

the

red

REC

indicator

will

light

and

the

record

circuitry

will

be

acti

vated.

To

actually

begin

recording

and

tape

movement,

depress

the

Play

Key

while

holding

the

REC

Key

down.

The

REC

Key

will

lock

in

the

down

position

and

the

tape

will

be

recorded.

The

REC

Key

must

be

depressed

before

depressing

the

Play

Key.

heard

somewhat

emphasized

when

very

soft

signals

are

reproduced.

Tapes

recorded

with

Dolby

may

also

be

de-coded

by

a

separate

Dolby

Noise

Reduction

system

using

the

standard

Dolby

calibration.

For

playback

of

Dolby-encoded

tapes

with

an

ordinary

tape

NOTE:

You

cannot

depress

the

REC

Key

if

a

cassette

is

not

inserted

in

the

cassette

holder.

You

cannot

depress

the

REC

Key

if

the

cassette

that

is

inserted

has

had

the

Record

protection

tabs

removed.

See

page

2

for

further

information

about

protection

of

recorded

tapes.

jquency

in

Hz

-10-

ffi

-20

|-3O.

§

-40-

z

-50

Dolby

System

Record

and

Playback

Frequency

Curves

RECORD

------

PLAYBACK

________

_

i

r

compressed

(viewed

down

from

the

reference

line)

[expanded

(also

viewed

down

from

___________

L

the

reference

line)

I

■

----------------------

tot

al

flatn

ess

["effects

of

noise

1

reduction

system

for

improved

S/N

ratio

Inter-deck

Compatibility

of

Dolby-Encoded

Tapes

Tapes

recorded

by

a

Dolby-system

recorder

(Dolby-encoded

tapes)

give

the

best

results

when

replayed

by

a

similar

Dolby-system

recorder

or

player.

Needless

to

say,

no

Dolby

effects

will

be

demonstrated

when

such

tapes

are

played

back

by

an

ordinary

tape

deck,

but

the

treble

range

may

be

■

w

1

i

1:4

,

-------

1

-------

Place

the

switch

to

IN

position

to

record

with

the

internal

Dolby

Noise

Reduction

circuitry

of

the

deck

or

when

playing

back

a

tape

that

was

previously

recorded

using

Dolby

Noise

Reduction

circuitry.

Place

switch

to

OUT

for

non-Dolby

recording

or

playback.

See

below

for

a

brief

explanation

of

the

Dolby

circuit

operation.

o

-10

(COMPRESSED)

a

-20

|

-30

£

-40

o

-50

|

hiss

&

noise

20

50

100

203

Fret

/

/

/

PLAYBACK

-/

/

/

(EXPANDED)

”

/

/

input

signal

!10kHz

■

/

1

i

i

i

i

-50-40

-30-20-10

0

INPUT

(dB)

_________

you

wish

to

record.

Set

switch

to

LINE

if

you

want

to

use

the

LINE

IN

Jacks

on

the

rear

panel

of

the

deck.

Set

the

switch

to

MIC/DIN

if

you

want

to

use

the

IN/

OUT(DIN)

Connector

on

the

rear

panel

or

the

MIC

Input

Jackson

the

front

panel.

The

recording

level

of

all

of

these

inputs

is

1

controlled

by

the

RECORD

Level

Controls.

..........

_

......

J

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