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2

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secas

YAMAHA

offers

you

thanks

and

congratu-

lations

on

your

choice

of

the

CT-610

AM/FM

Stereo

Tuner.

Product

of

research

directed

at

making

the

best

possible

audio

performance

available

to

the

widest

range

of

enthusiasts,

the

CT-510

ts

currently

setting

new

standards

for

its

class.

1.

Audio

Quality-First

Design

Building

on

YAMAHA’s

unique

audio

and

ele-

ctronic

engineering

know-how,

as

developed

for

the

top-of-the-line

CT-7000,

the

CT-610

features

low

distortion,

high

sensitivity,

and

excellent

S/N

ratio.

2.

High

Performance

Reception

Junction-type

FET,

three-gang

tuning

capaci-

tor,

six

special

ceramic

filters,

and

six-stage

con-

stant

bias

current

differential

limiter

assure

superb

radio

reception.

3.

High

Fidelity

Waveform

Transmission

Low

distortion

(and

therefore

high

audio

quali-

ty)

are

the

result

of

special

YAMAHA

integrate

gain

analysis,

not

only

for

all

frequencies,

but

also

over

a

wide

range

of

input

levels,

from

weak,

distant

stations,

to

powerful

local

stations.

4.

NFB

PLL

MPX

Stereo

Demodulator

Section

Negative

Feedback

(NFB)

phase-locked

loop

(PLL)

multiplex

(MPX)

circuitry

has

all

been

built

into

one

high

performance

IC,

replacing

a

host

of

individual

components,

for

greater

reliability,

im-

proved

performance,

and

lowered

cost.

5.

Signal

Meter

with

Quality

Indication

Waves

that

reach

the

antenna

after

being

re-

flected

from

nearby

hills

or

buildings

(‘multipath’

CONTENTS

AND

FEATURES

Front

Panel

and

Controls

teaser

eh

kennen

4

Rear

Panel

and

Connections

—

|.--------csccecececesserscneecesesecseces

ais

5

|

Connecting

and

Operating

the

CT-610

with

Other

Components

+}...

6

Block

Diagram

and

Specifications

|...

nen

een

10

Trouble

Shooting

—

|»-..----

waves)

interfere

with

the

main

broadcast

signal,

and

degrade

performance.

The

CT-610

has

a

special

circuit

which

detects

these

waves,

and

uses

them

to

produce

a

‘waver’

in

the

signal-strength

indication.

It

is

simple

to

turn

the

antenna

for

minimum

variation,

giving

maximum

quality.

6.

Standard

333

Hz

Signal

for

Level

Setting

The

REC

CAL

function

gives

a

standard

signal,

ideal

for

recording

calibration

and

optimum

level

setting.

The

variable

level

setting

has

a

center

click-

stop

for

known

rated

output.

7.

Muting

Circuit

for

Quiet

Inter-Station

Traverse

8.

Low

Distortion

AM

Circuitry

for

Added

Enjoy-

ment

CAUTION-READ

THIS

BEFORE

OPERATING

YOUR

CT-610

The

CT-610

is

a

high

performance

AM/FM

stereo

tuner

with

excellent

selectivity,

sensi-

tivity,

and

several

special

features.

This

manual

is

required

reading

if

you

are

to

get

the

best

from

it.

Do

not

drop

or

otherwise

jar

the

CT-610,

which

is

a

precision

instrument.

Do

not

place

the

CT-610

where

it

will

be

exposed

to

direct

sunlight,

excessive

heat

(for

instance

over

a

radiator

or

on

top

of

an

amplifier

which

generates

a

fair

amount

of

heat),

moisture,

or

dust.

Do

not

use

chemical

solvents

(such

as

benzene

or

alcohol}

to

remove

traces

of

dirt.

Wipe

only

with

a

soft,

slightly

damp

cloth.

a

Do

not

attempt

to

carry

out

internal

adjust-

ments

or

repairs.

Leave

this

to

your

local

service

representative.

Do

not

assume

your

CT-610

is

faulty

before

checking

the

‘Trouble

Shooting’

list

on

page

11

for

common

operating

errors.

Operate

all

switches

and

knobs

in

accord-

ance

with

the

instructions,

Avoid

applying

undue

force,

which

should

never

be

necessa-

ry,

and

to

not

attempt

to

use

intermediate

settings.

Keep

this

manual

in

a

safe

place

for

future

reference,

and

refer

to

it

frequently

until

you

are

perfectly

familiar

with

all

CT-610

controls

and

functions.

If

your

CT-610

has

a

voltage

selector,

check

that

it

is

set

to

your

local

voltage

before

you

plug

in

the

AC

supply.

If

not

properly

set,

unscrew

the

two

switch-

guard

retaining

screws,

and

reset

the

switch

to

indicate

your

supply

voltage

(110—130V,

or

220—240V).

Canadian

models

are

set

for

117V,

60

Hz

alone,

and

have

no

voltage

selector.

Be

sure

to

replace

the

switch-guard

and

its

two

retaining

screws

after

making

the

adjust-

ment,

inverting

it

so

that

the

new

voltage

setting

shows.

VOLTAGE

SELECTOR,

VOLTAGE

SELECTOR,

U

i

a

lire

a

9

10-130"

e

FRONT

PANEL

AND

CONTROLS

FM

88

es

SO

sı

92

93

ı

Leit

a

Bere

braved

PLease

eer

re

Phe

Bu

u

De er

BB

BB

Ba

beret

1

1 I

+

I

AM

550

soo

700

soo

sb

PIWER

OUTPUT

LEVEL

FUNCTION

MUTING

«FM

AUTO

AAS

Ces

LENO

aM

de

y.

>

s

r

FMMOND

3,

7

A

ON

—

2:

+8

MEC

CaL-

q

ca

La

bd

a

o

10

©

@

FM

Tuning

Scale

This

scale

is

frequency

linear,

so

that

stations

are

spread

out

evenly

across

the

dial,

not

clumped

together

at

one

end.

The

units

are

MHz.

D

@

AM

Tuning

Scale

This

scale,

marked

clearly

in

kHz,

is

used

when

tuning

in

AM

stations.

8

Tuning

Indicator

This

pointer

indicates

accurately

the

frequency

of

the

station

to

be

tuned

in.

The

slide-ruler

type

pointer

ensures

high

precision

for

rapid

station

location.

94

935

98

97

95

es

106

101

104

SE

IS

LT]

MA

O

A

ead

Enz

1

L 1

I

1

I

I

i

!

l

1000

1f00

12004300

1400

15001600

kHz

103

104

105106

107108

O

da

da

Ma

FM

STEREO

I

POEPEPEerber

bat

rete

Ed

11111341414

POWER

FIM

TUNING

O

===]

O

@

EM

STEREO

Indicator

Lamp

This

lamp

illuminates

when

FM

stereo

broadcasts

are

being

received.

It

goes

out,

however,

if

the

FUNCTION

selector

is

turned

to

the

FM

MONO

setting.

@

POWER

indicator

Lamp

This

lamp

illuminates

when

the

POWER

switch

is

in

the

ON

position,

indicating

that

electrical

power

has

been

connected.

If

it

goes

out,

with

the

POWER

switch

still

ON,

this

can

mean

that

the

power

fuse

has

blown.

@

POWER

Switch

Switch

ON

to

connect

the

main

electrical

supply.

@

OUTPUT

LEVEL

Control

This

sets

the

output

level

to

suit

the

input

requirements

of

your

amplifier

unit.

Adjust

it

so

that

the

volume

setting

of

your

amplifier

does

not

need

to

be

changed

when

switching

from

TUNER

to

other

sources,

such

as

PHONO

or

TAPE.

The

center

click

stop

gives

a

calibrated

output

which

is

detailed

in

the

Specifications.

O

FUNCTION

Selector

Switch

This

selects

whether

FM

or

AM

broadcasts

are

to

be

received,

and

if

FM,

then

whether

in

MONO,

STEREO,

with

HIGH

BLEND

and/or

MUTING,

and

also

offers

a

REC

CAL

position

for

tape

recorder

calibration.

©

SIGNAL

Meter

This

indicates

the

strength

of

the

signal

for

both

AM

and

FM

station,

and

indicates

FM

multipath

interference

by

fluttering,

with

the

amplitude

of

the

variation

showing

the

extent

of

the

interference.

©

FM

TUNING

Meter

This

is

used

when

tuning

in

FM

stations:

the

indicator

points

to

dead

center

when

the

station

is

perfectly

in

tune.

@

Tuning

Knob

|

The

tuning

knob

is

large,

and

the

precision

tuning

mechanism

eliminates

backlash,

for

smooth

and

positive

station

selection.

|

REAR

PANEL

AND

CONNECTIONS

ein

WARNING-TO

PREVENT

FIRE

OR

SHOCK

HAZARD,DO

NOT

EXPOSE

THIS

APPLIANCE

TO

RAIN

OR

MOISTURE

FM

ANT

GND-AM

ANT

OUTPUT

75NUNBAL

SOON

EAL

-

.

.

2|®

QQAQA

je

@

YAMAHA

voce

creo

®

“0

A

©

@

@®

©

Q

FM

ANT

(75

Q

Coaxial

Cable)

This

special

bracket

and

terminal

is

provided

for

use

with

759

coaxial

cable.

Coaxila

cable,

in

@

AM

Bar

Antenna

This

rod

is

a

special

indoor

antenna

for

AM

reception.

It

should

be

folded

out,

away

from

the

chassis

of

the

CT-610,

to

get

the

best

results.

In

most

situations

this

bar

antenna

will

give

satisfac-

tory

reception,

but

in

locations

remote

from

the

broadcasting

station,

or

where

the

terrain

(hills

or

mountains)

or

the

environment

(steel-frame

build-

ings,

etc.)

are

unfavorable,

an

external

antenna

may

give

noticeably

better

results.

which

the

central

core

is

shielded

by

an

outer

braided

sheath,

reduces

losses

in

signal

strength

between

the

antenna

and

the

CT-610,

and

also

reduces

the

amount

of

interference

picked

up.

Some

models

of

the

CT-610

are

provided

with

a

coaxial-piug

jack

in

addition

to

the

coaxial

bracket

and

terminal,

as

shown.

@

FM

ANT

(3000

Balanced

Feeder)

This

is

the

pair

of

terminals

used

with

ordinary

twin

type

feeder

wire,

like

that

used

in

the

indoor

FM

antenna

provided

with

the

CT-610.

Although

the

high

sensitivity

of

the

CT-610

means

that

an

indoor

antenna

can

often

give

satisfactory

results

with

local

stations,

a

proper

FM

antenna

will

always

give

better

results.

@

GND

(Ground)

Connection

Connection

of

a

ground

or

‘earth’

connection

can

make

a

worthwhile

difference

to

AM

reception,

effectively

increasing

sensitivity

and

reducing

in-

terference,

particularly

hum.

Q

AM

ANT

(External

AM

Antenna

Terminals)

in

areas

where

the

bar

antenna

proves

inadequate

for

satisfactory

AM

reception,

or

wherever

recep-

tion

of

remote

or

low

strength

stations

is

required,

an

external

antenna

should

be

connected

to

this

terminal.

@

OUTPUT

Terminals

The

output

terminals

of

the

CT-610

provide

a

fully

variable

signal,

suitable

for

all

types

of

pre-main

amplifier

or

tape

recorder.

The

level

is

set

by

the

OUTPUT

LEVEL

control

on

the

front

panel.

Use

the

pin-plug

cables

provided

with

the

CT-610

to

connect

the

OUTPUT

terminals

on

the

rear

panel

to

the

TUNER

or

AUX

input

terminals

of

your

preamplifier

or

pre-main

amplifier.

Make

sure

that

you

connect

the

LEFT

(upper)

output

terminal

of

the

CT-610

to.

the

left-channel

input

terminal,

and

the

RIGHT

to

the

right-channel.

Adjust

the

OUTPUT

LEVEL

control

so

that

there

is

no

significant

change

in

volume

when

|

|

Amplifier

Connections

switching

from

TUNER

to

other

sources

(PHONO

or

TAPE)

with

your

amplifier.

You

can

record

directly

from

the

CT-610

with

a

tape

recorder:

use

pin-plug

cables

to

connect

the

OUTPUT

terminals

to

the

tape

recorder

LINE

IN

terminals.

Check

that

the

LEFT

(upper)

output

terminal

is

connected

to

the

left-channel

input

terminal,

and

the

RIGHT

to

the

right-channel.

See

also

the

instructions

for

using

the

REC

CAL

setting

of

the

FUNCTION

switch,

which

can

be

particularly

useful

when

recording

direct

from

the

CT-610.

.

ADJUSTING

THE

AM

BAR

ANTENNA

-

The

high

efficiency

ferrite

bar

antenna

provided

with

the

CT-610

is

all

that

is

required

for

satisfactory

reception

except

in

low

signal

strength

areas,

so

that

usually

no

external

AM

antenna

will

be

needed,

The

bar

antenna

is

hinged

so

that

it

can

swing

out:

try

swinging

it

while

watching

the

SIGNAL

strength

meter.

Set

it

at

the

angle

which

gives

the

maximum

reading

for

the

weakest

station

you

will

normally

be

listening

to.

In

a

metal-frame

building,

or

in

locations

remote

from

the

station

or

where

reception

conditions

are

unfavorable,

an

external

AM

an-

tenna

should

be

connected

to

the

AM

ANT

terminal.

Even

better

results

will

be

obtained

if

at

the

same

time

a

good

ground

(earth)

connection

is

made.

A

good

ground

connection

can

sometimes

be

made

to

a

water

pipe.

However,

under

NO

circumstances

should

you

attempt

to

make

a

ground

connection

to

a

gas

pipe.

Your

dealer

will

advise

you.

1

Set

the

FUNCTION

switch

on

the

front

panel

to

AM.

`

2

Turn

the

tuning

knob

until

the

tuning

indicator

is

at

the

station's

frequency.

3

Adjust

the

tuning

knob

to

give

the

maximum

reading

on

the

SIGNAL.

meter.

4

Note

that

the

TUNING

meter

does

not

work

for

AM.

First,

connect

the

T-type

internal

(indoor)

antenna

provided

with

the

CT-610

to

the

300

Q

BAL

Terminals

on

the

rear

panel.

The

two

arms

of

the

‘T’

should

be

tacked

at

full

stretch

to

the

ceiling

or

walls

of

your

room.

Try

them

in

different

positions,

and

choose

that

which

gives

the

best

reception

for

the

weakest

station

to

which

you

will

normally

be

listening.

If

you

cannot

obtain

satisfactory

reception

even

varying

the

angle

of

the

horizontal

T

through

a

full

180°,

this

is

an

indication

that

you

need

an

external

FM

antenna.

The

T-type

antenna

is

adequate

only

in

high

signal

strength

areas

under

favorable

conditions.

In

all

other

cases,

an

external

multi-element

FM

antenna

is

needed.

To

ensure

the

very

best

results,

a

motor

driven

antenna

assembly

with

remote

control

of

orientation

is

best,

but

the

CT-610

has

CTING

AN

FM

ANTENNA

_

sufficient

sensitivity

to

operate

extremely

well

with

a

fixed

antenna.

External

antennas

are

available

for

use

with

the

30082

and

75Q

terminals:

the

latter

will

use

the

shielded

coaxial

cable

which

reduces

losses

and

interference.

Antennas

intended

for

3002

bal-

anced

feeder

wire

can

also

be

used

with

75Q

coaxial

cable,

but

a

matching

transformer

is

neces-

sary

at

the

antenna.

Coaxial

cable

shuld

be

used

where

the

antenna

must

be

located

some

way

from

the

CT-610,

or

where

interference.

from

automo-

bile

ignition,

etc.,

is

troublesome.

The

external

antenna

should

be

located

as

close

as

convenient

to

the

CT-610,

and

as

high

as

possible,

It

should

be

oriented

to

give

the

highest

SIGNAL

meter

reading

possible

for

the

weakest

station

you

will

normally

be

listening

to.

If

this

direction

is

not

too

critical,

you

can

orient

the

antenna

for

minimum

interference

from

auto-

mobile

ignition,

etc.

CONNECTING

COAXIAL

CABLE

1

Strip

insulation

from

outside

braided

sheath,

and

bend

back

outside

the

insulation.

Expose

the

projecting

central

core

wire

as

shown.

2

Slacken

the

two

retaining

screws,

insert

the

coaxial

cable,

and

re-tighten

the

screws

so

that

the

clip

grips

the

exposed

braided

sheath.

3

Connect

the

central

core

wire

to

the

752

terminal.

4

If

your

CT-610

is

provided

with

a

coaxial

jack,

use

this

with

a

coaxial

plug

on

the

75

Q

coaxial

cable,

Whether

you

use

plug

or

terminal,

ensure

that

the

braiding

does

not

come

into

contact

with

the

inner

core.

||

FM

BROADCAST

RECEPTION.

1

Set

the

FUNCTION

switch

on

the

front

panel

to

FM

AUTO.

2

Turn

the

tuning

knob

until

the

tuning

indicator

is

at

the

station’s

frequency.

3

Adjust

the

tuning

knob

to

give

the

maximum

reading

on

the

SIGNAL

meter,

and

to

bring

the

FM

TUNING

meter

pointer

to

the

exact

center

position.

This

will

ensure

optimum

tuning.

4

When

the

broadcast

is

in

stereo,

the

STEREO

indicator

lamp

will

light,

and

will

automatically

go

out

when

MONO

broadcasts

are

being

made.

|_|

[rm

BLEND

POSITION

When

you

are

listening

to

a

weak

FM

station

in

stereo,

there

can

be

unpleasant

high

frequency

noise

(a

kind

of

‘hiss’).

If

this hiss

noise

is

bothering

you,

switch

to

the

FM

BLEND

position,

which

cuts

out

the

noise

very

effectively.

By

switching

to

the

MONO

position

this

kind

of

noise

can

be

reduced

still

further,

but

of

course

you

will

no

longer

be

able

to

enjoy

stereo

reproduction.

REC

CAL

POSITION

—

In

this

position,

instead

of

broadcast

reception,

the

CT-610

output

will

consist

of

a

333

Hz

signal

`

corresponding

to

50%

modulation.

When

using

a

tape

deck

to

record

from

the

CT-610,

the

OUT-

PUT

LEVEL

control

and

tape

recorder

input

level

controls

should

be

adjusted

to

give

a

level

of

—6

VU

on

the

tape

deck

level

meters.

This

can

be

increased

to

—2

VU

depending

on

the

tape

deck

and

the

kind

of

tape

being

used.

Once

you

have

determined

the

ideal

setting

for

your

tape

deck,

the

REC

CAL

position

enables

you

to

find

it

again

quickly

and

conveniently.

So-called

‘multipath’

waves,

reflected

-from

nearby

hills

or

tall

buildings,

can

seriously

degrade

tonal

quality

in

FM

reception.

In

addition

to

the

obvious

deterioration

in

tonal

quality,

the

SIGNAL

meter

can

also

give

you

an

indication

of

the

existence

of

multipath

waves:

it

will

show

slight

fluctuations.

If

you

notice

this,

alter

the

orientation

of

your

antenna

to

give

a

steady

meter

reading.

You

will

enjoy

generally

better

tonal

quality

even

if

this

level

is

a

little

lower

than

the

maximum

when

indication

is

fluctuating.

bh

BLOCK

DIAGRAM

SPECIFICATIONS

FM

Section

Tuning

range

Sensitivity

(IHF,

38

MHz)

Quieting

Characteristic

5

uv

10

uV

Image

rejection

(88

MHz)

IF

rejection

(88

MHz)

Spurious

rejection

AM

suppression

Capture

ratio

Selectivity

(IHF)

Signal/noise

ratio

Mono

Stereo

Total

harmonic

distortion

Mono

400

Hz

50

Hz

to

10

kHz

Stereo

400

Hz

50

Hz

to

10

kHz

10

BLOCK

DIAGRAM

AND

SPECIFICATIONS

88

to

108

MHz

1.8

uV

(300

2)

0.9

uV

(750)

55

dB

60

dB

55

dB

75

dB

75

dB

56

dB

1.0

dB

75

dB

77

dB

71dB

0.15%

0.3%

0.25%

0.8%

Sub-carrier

suppression

Stereo

separation

400

Hz

50

Hz

to

10

kHz

Frequency

response

Muting

signal

level

Multipath

indication

AM

Section

Tuning

range

Sensitivity

(IHF,

bar

antenna)

Selectivity

(1000

kHz)

Signal/noise

ratio

(80

dB/m)

Image

rejection

(1000

kHz)

IF

rejection

(1000

kHz)

Spurious

rejection

(1000

kHz)

40

dB

40

dB

30

dB

50

Hz

to

10

kHz

+0.5

dB

20

Hz

to

15

kHz

+35

dB

5uV

Signal

meter

fluctuation

(re-

duction

in

indicated

level).

525

to

1605

kHz

52

dB/m

25

dB

50

dB

50

dB

40

dB

45

dB

Total

harmonic

distortion

(80

dB/m)

0.6%

Audio

Section

-

Output

level/Impedance

(1

kHz)

FM

(400

Hz,

100%

mod.)

With

level

centered

AM

(400

Hz,

30%

m

od.)

With

level

centered

-

REC,

CAL.

signal

333

Hz

With

level

centered

(corresponding

to

50%

FM

modulation)

General

Semiconductors

used

Power

supply

Power

consumption

Dimensions

(W

x

H

x

D)

Weight

0.1V

to

1.0

V/2.5

kQ

500

mV/2.5

kQ

25

mV

to

250

mV/2.5

kQ

125

mV/2.5

kQ

50

mV

to

500

mV/2.5

kQ

250

mV/2.5

kQ

22

Transistors,

3

ICs,

1

FET,

10

Diodes,

4

Zener

Diodes,

2

LEDs,

and

6

FM

ceramic

filters.

120

V,

60

Hz

USA

&

Canada

220—240/110—130

V,

50/60

Hz

Europe

7

Watts

435

x

160

x

349

mm

(17-1/8"

x

6-1/4"

x

13-3/4”)

6

kg

(13.2

Ibs)