Dyna Dynakit SCA-35 Instructions For Assembly And Operation Manual

SERIAL

This

number

tioned

tions concerning Dynakit.

NUMBER

. I

15350075

mustbemen-

in

all communica-

STEREO

CONTROL

INSTRUCTIONS ASSEMBLY

OP.ERATION

AMPLIFIER.

FOR

AND

,..

Patented

Price

$1.00

086315

SPECIFICATIONS

• •••1)

5

6

7

9

Tone

Control

Sensitivity

Rated

Power

Frequency

Power

1M

Hum

Tube

Complement:

Silicon

Power

Consumption:

Special

Inputs:

Outputs:

Controls:

Range:

Output: Output:

Response: Response:

Distortion:

and

Noise:

Diodes:

Features:

for

7 pairs: magnetic Ceramic (100,000

Constant loudspeaker

output,

Selector, Volume, Balance, Bass, Stereo-Mono Switch,

± 12

2.5 mv

RIAA

magnetic

phono high level (50,000 phono; ohms);

provision for

level

outputs,

NAB

71j2

radio, tape,

tape

output,8and

center-channel

headphone

Switch, Loudness

Filter

Switch, Power Switch.

dbat50

at

cps

and

15 kc.

tape

head, 4 mvatlow level

phono

i.p.s.

spare

low level,

ohms);

tape

head

(250,000

ohms)

16 ohm

loudspeaker

connection.

Treble,

Compensation

magnetic

phono, 1 voltathigh level inputs. 35

watts

Music

continuous, 45

Power

(both

watts

channels).

IHF

± 0.25dbfrom 20 cpsto20 kc.

to

20 kc

20 cps

without

within 1dbof 17.5

than

Less Less

1%at17.5

than

0.2%onany

exceeding 1%

watts

(each

watts

(each

inputataverage

distortion

channel)

.

listening levels.

70

db

below

rated

outputonlow level inputs.

db

downonhigh

80

12AX7/ECC83 6BQ5/EL-84/7189

500

MA,

1000

level inputs.

(2),

(4).

PIV

7199

(2).

(2),

110 watts, 120 volts 60 cycle AC,or120/240volts 50/60

cycle

AC

with

optional

PB-028

power transformer. Attractive

front outlets; provision for

center-channel level control;

output; encapsulating

quietest

Champagne-gold anodized

panel

and

die-cast knobs; 2ACconvenience

headphone

power

transformer

material

for coolest,

operation.

aluminum

output

center

or

speaker

sealedinspecial

INSTRUCTIONS THE

DYNAKIT

The

SCA-35isa amplifier combination which servesasa control various program sources radio.

The

SCA-35 desired, modification of sound

source,

nections for loudspeakers

The

made on

vided. the program source tween these components.

connection of loudspeakers to

inputs tom row for

operation of

viding use of switches

of listening pleasure.

.Jeledor

• permits

"phono"

will extends

switch being played,

single channel signal playing monophonic recordings with a stereo cartridge,

"mono" ponents a monophonic station, frequently eliminates noise

Volume

level of settingofthe

loudspeakers and/or

the is a specific loudness level desired knob pointer.

settingorvolume control, this should be

...

~e

..

itisswitched to

The

and

The

front suitable

the

Rotationofthe

be

The

Clockwise rotation of

control is

played-you

If

the

witching from one

same loudness.

Beneath

and

connection of various types of program sources

the

back

shielded

outputsisused

the

panel

the

SCA-35 using

and

the

other

switches

Switch

use of

for example,

available to you.

stereo-mono switch

its

utility.

in

the

position eHminates of the signal.

Control

the

signal

and

tuners.Itshould be recognized

not

sound

tuner,orother

the

high

quality such

permits

change

panel

audio

equipment

right

FRONT PANEL CONTROLS

controls

SCA-35 simple

flexibility. Althoughitis possible to enjoy

volume control, knowledge of

Each

selector switchtothe

the

marked

For

"stereo"

"mono"

through

control will

the size of related to

may

level.

inputtoanother,

volume control is

"loudness"

selection of

the of volume;itprovides and

through

cable'S There for

channel.

have

and

controls

of these will be described briefly.

input

start

the

stereo signal sources, leave the

position.

position of

through

mostofthe

When

the

"mono"

the

both

dependonthe

the

have a wide range of settings to give

Adjustment

without

input

stereo preamplifier

as

phonograph,

tonal characteristics of

headphones.

the

and

are

used

are

the

unit.

the

left channel,

been designed to

and

only

the

can

source. After switching to

record player,

beneath

When

the

both

loudspeakers. When

a stereo

and

volume control increases

the

regardtothe

equipment, has

there

FM

position of

distortion.

loudspeakers:

signals from

power levelatwhich music

should be

the

loudness switch.

is additional bass intro-

FOR

SCA-3S

the

program

several sockets proplugs

supplied

for connection be-

screw terminals for

The

upper

obvious while pro-

power

the selector switch

and

provide increased

marked

and

a mono source is

switch brings

vertical noise com-

tuneristuned

efficiency of

the

that

the

position of

its setsothat sound is close to

ASSEMBLY

STEREO

and

center

output

and

the

The

cartridges

position of

madetothe

for

tape

and

source

the

con-

with

row of

the

bot-

make

thf:

selector

function

positions

its

signal

this

the

to

switch

the

normal

the

own level

when

When

AND

OPERATION OF

CONTROL AMPLIFIER

into

duced

mid-pointorbelow.Athigh settings of the

loudness switch has no effect. tureisthat frequencies helps to correct for this. music which

is

Balance

The two loudspeakers, which helps the

balance control to the right speaker, the

left. to

the

Normally

the

mid-point

ming,

ponent

the

mid-point. Since gradual

offsetting

When off one signals reverse

not

wanted

Tone

The

the

with

bass control response is

at

counter-clockwise rotation gives

When uation will improve attenuation can

benefit from bass boost. whatever position that

departures

user

should

tonal characteristic.

Beneath isinthe attenuating This scratchy and

so on.

it

does used extremes of tonal correction.

Power

The

the

SCA-35onand

switched

warmup

for

the music when

the

human

at

low volume levels,

can

Control

balance control is used to equalize

Turningtothe

right.

the

(12

in

speaker

toleranceinthe

in

the

area

itinthis

rotatedtoeither

speaker appear track

Controls

bass

treble control affecting high frequencies,

without

12 o'clock. Clockwise rotation provides boost,

program

"filter" positionitgives a narrow

should be

records, excessive rumble, noisy radio broadcasts,

not

in

Switch

power switch has

outletonthe

in

of a mono

simultaneously.

and

the

should be used.

from

not

getinthe

the

tone controls is

both

used

By

attenuatingatboth

create

Conjunction with

after

ear

It

enhance

the

thus

making the sound source move to

right

balance control is centered whenitis in

o'clock),

efficiencies,inroom acoustics,

SCA-35

the

of rotation from 9 o'clockto3 o'clock,

region does

completely.

the two stereo channels

treble controls

low frequencies.

frequency discrimination when

sources

the

sound.Ifthere is boominess, bass

sounds

"flat"

high

and

with poor program material,

a shiftinoverall tonal balance.Itcan

off (along with

back

turning

the

volume control isatthe

the

volume control,

The

reason for this fea-

has decreased sensitivity to low

and

the

loudness switch

will

add

a fullness to low level

its

pleasure.

the

to

center

left will diminish

will move

but

differencesinprogram-

may

require a

effects of

extreme, the balance control cuts

This

tape

are

harshorstrident, treble Some

These

best,

are

ofa corrective

habit

low frequencies simultaneously.

the

panel).

this

switch to

this

not

indicate abnormality.

canbeused

machine),

operateinsimilar fashion

Each

attenuation.

thin sounding

controls should be

butitshould be remembered

of listening to a corrected

the

filter switch. When

endsofthe

tone controls for

obvious function of turning

any

Allow

signalsatthe

the

sound.

the

control

and

of these gives "flat"

equipmentinthe

about

"power."

Turning

the

sound

sound source

andincom-

setting

are

if different

(such

as

the

two

and

the

pointer

atten-

material

set

nature;

band

and

response,

such

spectrum,

15 seconds

very

the are

the

and

the

this

great

to

off

to

as

be

3

BACK

Phono

can

for use of all choice of magnetic ular if high

be used.Ifyou find

usingitin

magnetic

amplification

read mine dations

today nectedtothe

the yout wire,inadditiontothe

tridge, from a the desirabletomake ortoan

that nel).Ifyou

the

tiontohear

Connections

Either

the

In

If

a record

be used.

magnetic

level model,

that

instructions

phono

phonograph,

grounding screw

the you

stereo-mono

There

(1)

cartridge,or(3)

cartridgeisratedatmore

there

the

input

whether

for

its

many

of

there

is a

screwonthe

inputs.Ifsuchaground

ground

"earth"

phono

COlUlcct

wanttohear

the

PANEL

changerora professional

are

typesofphonograph

low level

cartridges

and

are

using seems to low level

may

be used.

without

which

its

manufacturer

connections

the

turntables

separate

thenitmay

pointonthe

on

further

ground.

cartridge

its

outputtoonly

switchonthe

program

CONNECTIONS

three

pairsofphono

magnetic

crystalorceramic

areofthe

the

high

a low level

be

phono

detriment

accompany

ground wire.

back

audio

the

ground is a mono one,

sound

through

cartridge,

than

level

too

much

input,

This

to performance. Always

has

and

use.

and

panelofthe

wire is

be necessary to

signal cables from

turntable

SCA-35.

conectionstowater

through

front

both

type

turntable

inputs,

cartridges.

type.

low level type. However,

20 millivolts

magnetic

amplification when then

will reduce

the

cartridgetodeter-

any

special recommen-

record changers

This

not

motororarm

Normallyitis

thenitis suggested

one

input both

paneltoits

loudspeakers.

allowing

Thereisa

(2)

high

level

Most

pop-

this

is a

input

should

cartridge

the

should

SCA-35 above

supplied

(either

channels,

mono posi-

high

level

the

total

made

be con-

connect

the

pipes

chan-

and

with

car-

not

turn

through direction unless

(1) thenbyusing the balance eliminate

cannotbeused recording preamplifier.

Radio

output

stereophonic, radio inputofthe connected ortoonly turn sound

out

a

(or for

to

made

Additional

typeofhigh moreofaudio back

orasecond

one

One cable sound

control

The

SCA-35

Connections

Radio

canbeused

input

the

from

If

the

its

own provision for switching these,

both)

AM.

with

The

spare

electronics huil t

the

SCA-35,

will

come

through

of

two

expedients

canberemoved

the

will come

sound

tuners

either

one

stereo-mono

tuner

of the

Then

the

mono

canbeturnedtoeither

through

canbeused

for recording

which

with

then

its

and

the

right

SCA-35.Ifthe

with a

input.Ifone

switchtothe

both

speakers.

has

separate

radio

selection of

selector switchonthe

Inputs

input

of

level

input

signal. A second

in)ortuner

phonograph

the

track

recordedinthe

one

channel

is

used

from

the

position of

through

the

for

can

supply

the

left

output

tuncr

"Y"

connectortoboth input

outputs

inputs

FMorAM

the

SCA-35 will

source which provides

which

the

both

unwanted

playing

withatape

SCA-35.Ifthe

for

tape

includes

stereo-mono

speakers,

extreme channel.

recorded

one

voltormore

is COlmectedtothe

goestothe

is monophonic,itcan

is used, mono

for

FM

and

SCA-35.

machine

maybeusedinthis

its

opposite

of

the

SCA-35

to

prevent

unwanted

or

deck which

tuncrisFM

radio

you

will have

position to receive

AM

and

you

may

the

spare

broadcasts

accommodate

(having

own preamplifier.

this:

chann*,

swit~)

(2)

The-

position to tape,

but

has

audio

upper

lower

radio

inputs,

FM

with-

use

inputs

can

one

volt

play-

inpue

it

no

be

to

one

be

any

or

~

'

Tape

Connections

The

SCA-35 which has withatape

If

the

machine putisatarelatively connected to AMP."Ifthe

low

and

The

tape

required

Generally, when

mustbeconnected

(see screwonthe wire for lowest

connect the the connectedtothe Whatever corded

Thus

tone the recorder.

track

NAB

instructions

If

the

tape

the SCA-35tothe

phonographorfrom

tape

unaffectedbyvolume

you

controlstosuit,

In

the

tape

can

its

own

tape

deck

having

hasatape

the

inputofthe

machineisa

the

input

head

input

7%

i.p.s.

the

supplied

SCA-35.

hum.

machine

recorder

socket

is being

can

listentoa

special case whereitis

withamonophonic

be

used

either

amplifier, or

direct

output

playback

high

level.Inthis

SCA-35 deck

marked

has

tape

from a specific

(not

played

without

"From

very

equalization

head

input

with

tape

Tryitwith

has

a recording amplifier,

tape

the

tuner.

the

microphone

marked

through

and

program

affecting

withatape

playback

from

amplifier,

case

marked

only,

the

TAPE

high

amplification

for

tape

is used, a

point

on

deck)tothe

and

without

machine

tone

for recording from

The

high

input)

"To

TAPE

the

SCA-35 will be re-

controlsofthe

and

adjust

the

signal going

desiredtoplayamulti-

recording

machine

electronics, or

the

tape

then

the

this

output

"From

outputisvery

HD"

is

and

head

playback.

ground

the

tape

grounding

this

you

level

input

should

RECORD."

volume

on

all

head.

out-

TAPE

used.

the

wire

deck

ground

can

of

be

SCA.

and

into

tracks

Loudspeakers

The

SCA-35

the

most cations Generally

is

of these ances used canbeused

upper shouldbeused

(marked

The

lower

on

N terminals. However,itis possible to speaker-asacenterorremote Details connect coveredindetail

identical.Ifthisisnot

considerably of to

of

the

SCA-35

terminals

than

for

speakers

The

left

output

right

output

each

eitherofthe

on

headphones

In

any

sounds

the

correct

can

provide

inefficient

the

this

marked.

with

channel

HC")

speaker

strip

this use

music

between the

loudspeaker

loudspeaker will be 8or16 ohms. are

marked

will

accommodate For

of 4 to 11 ohm ratings;

speakers

loudspeaker

strip. A

strip.

distorted,

localization of those sounds.

pair

with

one

and

the

should

Note

are

connected

two

speakers

are

to the

later.

systemitis

speakers

sufficient power to

systems.

to

determine

The

for

speakersofthese

a wider range of imped-

example,

from 12to20 ohms.

of wires,

wire going to

othertothe8or16ohm

that

given later.Itis also possible to

loudspeaker

possible, the

and

the8ohm

shouldbeconnected

such

the

be

similarly

the

extreme

together

shouldbeconnectedtothese

connect

speaker--·to

terminals, a

best

that

both stereo

there

will be shifting of

in a way which is

drive

Check

speaker

the16ohm

as

by

the

its

impedance.

terminals

values,

output

# 18

lamp

common

connected

left

hand

a wire

a thiJ:d loud-

these

terminals.

loudspeakers

effect

unrelat~P'

all

specifi-

can output

to the

terminal

terminal.

to

screws

strap.

subject

may

positicA'

but

be

cord,

the

be be

4

-

Other

switched power cord is plugged in. to power a radio with a require mechanical switching automatically

suitable nating models) .

used for tion is explained below.

SCA-35 trols,

Hum

"phono,"

v

ance left Repeat loudspeaker, These and

normal listening levels.

and then

satisfaction.

deck, using

willbeat phonoortape will be where

this case, since whether

Phasing

erly thenbeleft fixed.

In

on

Back

Panel

There

are

two AC

wer cords of

these

outletsisswitchedinunison

e

SCA's

the

turntable,

The

line cord of

outlet

current

There

Once

and

you

Adjustments

Turn

the

5 seconds, ear

some control to

hum

this

controls

this

Turn

the

advance

you

The

same

much

the

For

best stereo effect,

phased-an

{

the

speaker

unison, movinginthe

monophonic signals.

auxiliary

power switch is operated.

and

will

furnish

tunersothat

SCA-3S.

are

hum

the

are

and

hum

control

point

can

about

minimum

the

Loudspeakers

The

record changer,ortape

when

furnishing

(120or240 volts, 50or60 cycles for

two

knurled

adjustmentofthe

USING

associated

you

are

readytotryitout.

volume down low,

turnonthe

advance

from the loudspeakers.

cutoff

(on

with

the

adjusting

should

volume down,

the volume

adjust

setup

the

tape

the

head

lower,

hum

controls

adjustment

Phasing

connections so

Connections

outletsonthe

equipment

poweratall times

The

lUlswitched

the

SCA-35 is

the

SCA-35

nominally

shaftsonthe

YOUR

equipment

familiar

SCA

the

volume control slowly

the

right

the

back

balance

the

give some

be

until

balance

procedure

head

input.

same

inputs

anditmay settingsofthe

should

are

set

the

consists of

same

back

panel to which the

may

be connected.

with

the

SCA-3S when

The

other

outletisnot

that

switched

this

and

with

set

power switch. After the first

loudspeaker,

panel)

control

right

low enough to

place

a recordonthe

you

and

can

pointaswith phono.Ifneither

are

to be used,

be inaudible,itis

accurately.

loudspeakers

which is

that

directionatthe

outlet

maybeused

canbeturnedonand

outlet

shouldbeused

machine. should turnedonor

should

120 volts, 60 cps

back

two channels.

SCA-35

is connected to

the

operationofthe

the

settocut

channel

minimum

have a

tone controls to

be followed

The

minimum

be difficult to

hum

arranging

both

These

not

be switched

be plugged

panel

Their

selector switch on

Then

turn

and

for

minimum

hum

point

be

inaudible

suitable

withatape

the

controls fall.

not

should

made

once

the

speakers

One

the

SCA's

for

devices

off.

into

alter-

export

which

are

func-

the

con-

until

you

the

bal-

adjust

the

hum.

off the left

control.

{or hum;

turntable,

level;

your

hum

point

hum

level

determine

important

be prop-

and

can

polarity

function

same

time,

Switch

the

balance speakers. equal

distance

trying correctly, the

center,

you

off

a

at

In

approach.Ifthe

be

will will

shift

ornoapparent

To

correct

rect,

you SCA-35 the

amplifierorat

Ventilation

When

quate

ventilation.

and

you with a 110 tainer-the

should There

should

unit

and

the

cover when

of

Cabinet

The

inet

installations.

A

supporting

1

3

:;{o"

A

3Y2" shelf to coincide with bottom which eliminates from

Dynaco

Adequate

not

cover

result

of insufficient ventilation. quently larly

where where vertical (face circumstances above

or

Under

use a

center signal two

partsofthe

can

eliminate which can

alsobeused reproduction speaker out

need

the

stereo-mono switch to

so

that

the soundisequal

Stand

to loeate

the

an

abrupt

suddenly

and

using

can

have

behind

Mounting

oversize

by

square

plate,

equipment

require

below

CONNECTING

some conditionsitis advantageous to be

(sum

are

is availableonthe

for

slightly forward of the speakers from each. Move from side to side while the

sound

source.Ifthe

source willbein

and

will

shift

smoothly to whichever

the

must

speakers

jumpinthe location of the sound,

from one side to the

centering.

phasing interchange

are

of the loudspeakers, ifitis incor-

the two wires between the

one of the speakers.

the speaker.

the

SCA-35itis essential

This

unit

dissipates 110

see

that

thereisthe

watt

incandescent

case will get

air

space

always be several inches of

it. Never

the

front

The

shelf

13Yt

widely

cutoutinthe

"

o

ventilation

under

the

for $2.00.

ventilationisimperative.

the

useofa

the

SCA

should

the

Dynatuner.

loudspeaker

of left

another

and

stereophonic signal.

the

"hol.e-in-the-middle" effect of

separated.

with

in

another

quite

above to

place

amplifier is operating.

panel

on

rubber

installed

the

need for the shelf, is available directly

which

mustbemounted

up)

the

A

a remote

amplifier.

feet

cutout

punched-out

output

No

C.O.D.'s please.

has

small

mounting

SCA

CENTER

which

right

The

area.

back

"mono."

from both loud-

speakers

the

center, when

phased

This

,

lampina small metal con-

watm

permit

anything

the SCA-35 facilitates cab-

are

flush with

cabinet

tubes. A

been

Cabinet

be stacked immediately

handles

channels) derived from

composite

loudspeaker

The

panelofthe SCA-35 with-

incorrectly, there

other

canbedone

thatithave ade-

same

heating effect

to the touch,

the

heat

air

space above the

directlyontop

not

used.

the

panel is required.

shouldbemade

section of

PBK

The

subject

installations fre-

circulating fan, particu-

close to a tuner,

is necessary.

LOUDSPEAKER

the

This

for monophonic

signal for

Then

are

phased

you

speaker

with

either

watts

of heat,

to dispell.

bottom of a

the

bracket

warranty

to abuse as

Under

able

monophonic

center

speaker

speakers

center

the

adjust

at

an

are

in

and

it

little

at

as

and

in the

SCA

kit,

does

the

or

no

to

the

signal

center.

-

L liiiiiiiiiliiiiiiililll

5

iiiiiiiiiiiiiil

the

Connection of removing most screws connecting two screws. or

level setting, control

the

level of

the

wire link,orjumper,

on

the

The

the

center

the

two loudspeaker

two wires from

diagram below also shows how a volume,

speaker. wirewound, potentiometer at

all

radio

parts

supply

The

control for

the

back

panelofthe

oritcanbeconnectedatthe

able, thisisparticularly

REMOVEJUMPER WHEII SPEAKERISCON·

IIECTEO

It

is

best when using levelatthe the

stereo speakers.

level of

of

function

the can

This

together switch the is and

be done

sound

the

extra

this

speakertozero,

in

their

If

the

control is

center

speaker

be donebyre-installing

can

also

the

canbelocated

speaker

closed,

there

normal

The

center

by

between speakers while moving back

between them. the

sound,

the

center

convenient for a remote speaker.

@I/

CEIITER

that

this

center

I,

all

the

arrangement.Ifthis is done,

speaker

The

speaker.Itcan

normal

not

to restore

be

done

two leads

location,orat

will benosound from

stereo reproduction willbeobtained.

speaker

should be

listening to

If

there

two wires to

speaker is accomplished by

can

be optionally

The

or

rheostat.

which connects

terminal

the

extra

speakertothese

added

control itself is a 4 watt,

They

strips

to control

are

available

the

stores.

SCA

.J

" /

//

I

speaker

using

,,//i'

'"/'//";/

/.

....

//.,.

f/,

CENTER

SPEAKER

/;;':-'

/

can

be connected

the

hole which is avail-

loudspeaker

__

..

~

....

-:..~--~~.

-

,,~?®\!

v~-_ll::~~-~"'l

-',

(~I'''

RIGHT

SPEAKER

LEFT

SPEAKER

location-

/---

....

CONTROl..

V I

/.

-'

,

...

_-_

....-...

CONTROL MO/JNTEO

Ci/ASSISAS~N

DRATCEIITER SPEAKER TIOII,

100fl,4W

"

M~Y

INSlbE

I.tJCA·

8£

speakers shouldbeidentical types

the

sound

will be comparable with

that

volume control will reduce

and

be used to reduce

then

the

stereo speakers will

the

way.

added,

any

are

anditis desiredtocut

by

to

normal

the

adding

the

stereo operation, this

jumperonthe

a switch to connect

center

loudspeaker.

back

place which is convenient -

the amplifier.

phased

the

smoothness of

When

the

center

properly.

transition

the

and

sudden

jumpsinlocalization of

the

center

speaker

should

panel.

switch

speaker,

This

forth

left-

and

on

of

the

level

out

This

at

can

of

be

interchanged. Correct phasing should provide a smooth changeinlocation of speaker.Ifthe not

important.

NOTE:

the

jumper

If

neither resulting There

will be

At

any

between

the

jumper

sound

center

sound

from side speakers to

speakerisused

time

that

the

screw terminals must be reinstated.

nor

center

remotely, phasing is

center

speaker

is connected,

center

is removed,

will have no monophonic components.

no

sound

with monophonic sources

the

and

unrealistic effects with stereo sources.

USING HEADPHONES WITH

Headphones

of

the

low

the

loudspeaker terminals of

course, be

with

the

In

addition, for ease of

a hole for a

of

the

SCA-35. A equivalent, or

equivalent, should be headphones proper

to

drop phones.

The

the

jack

diagram

headphone

the

If

resistors value recommended

made

for

high

impedance

used

instructions of

type, designedtobe connected

directly with

the

headphone

jack

jackofthe

canbemountedinthis

used

are

supplied with a different

should

be obtained for

below shows

jack.

The

signaltothe

level which is required for head-

thereisinadequate

can

be reduced

by

to

the

fidelity usage

the

is available on

the

100 ohm, % watt, resistors

level

47 ohms,

manufacturer phones. Some headphones have itisnot

latedtoavoid

of

for double pole switch the be it

necessarytoinstall them,

short

circuits) .shouldbeconnectedinplace

the

resistors shown.

If

it

is desired to

headphone

loudspeakers

mounted

any

cut

listening,

can

during

place along

out

the

pictorial diagram shows how a

be

used

headphone

the

canbekeptina convenient place if switching is required

THE

SCA-35

are

generally

amplifier.

These

can,

SCA-35inaccordance

manufacturer.

connection

Switchcraft

hole. A

the

type

and

back

12B,

290 plug,

with the 12B jack.Ifthe

type

of plug,

the

plug

used.

best

the

and

method

after

resistors

of connection

installation, these

ortoany

straight

specific

of

the

built

in.

wires (insu-

loudspeakers completely

to eliminate sound from

use.

This

switch

loudspeaker wires so

frequently.

SWITCH

CRAFT

TYPE

128

If,

after

the

headphones

the

right

and

left sides

not

of a construction which

this

can

be

most simply corrected

resistors from

the

two

TO

LEFT

SPEAKER

are

jack

are

incorrect

can

lugs

TO

RIGHT

SPEAKER

installed,itis

and

the

be reversed

by

disconnecting

and

interchanging

found

phones

on

the

connections.

use,

panel

or

the

head-

Then

can

that

are

head,

th the

• I

'\\

\

6

-

TECHNICAL DESCRIPTION

The

DYNA

lete stereo preamplifier

ed on a single chassis with a single power supply.

SCA-35 uses new

arrangement

ill

a compact aminationofthe apparently closer

scrutiny

Stereo Control Amplifier, SCA-35, is a com-

and

stereo power amplifier com-

circuitry

which provides highest

and

moderately priced unit. Superficial ex-

circuitofthe

simple

and

new components in a unique

quality

SCA-35

and

conventional design. However,

might

performance

indicate

will revealanextremely sophisticated

The

an

and

carefully refined design.

There

stereo preamplifier; (2) the dQal tone control section;

the stereo power amplifiers,

of these utilizes novel circuitry

ponents conservatively operated.

are

four basic sections of

and

the

SCA-35:

(4)

the power supply.

with

premium grade com-

The

four sections combine

(1)

the

(3)

Each

inaninter-relationship which develops the maximum poten-

tial of these components.

The

Preamplifier

The

preamplifier section of

cuit

moduleinwhich a 12AX7

channel. All low level

inputs

these tubes via a portion low level magnetic cartridges are

introduced to the

(packaged electronic

tape

head

input.

'through two stages

amplification of cal

maximumbythe

circuit).

These

(the

this

tube

application of positive feedback from

the

SCA-35isa

are

of

the

and

input

tubeisused

fed to selector switch. crystaVceramic cartridges

switch through a

The

switch also selects a

the

for

input

low level signals

two halves of

the

12AX7).

is increased almost to

printed

each

are

its

cir-

stereo

stages of

High

and

PEC

amplified

The

theoreti-

cathode to cathode.

A negative feedback loop containing

tion circuits to

is carried

shape

around

the

response of phono

the

12AX7. Operating selected to enable this stage to levels below 0.1

produce

one voltat1000

The

outputofthe selector switch, whichatthis level

inputs

The Tone Controls

Dual tone controls

pletely passive;

is also a

PECinwhich Associated with balance control,

this section normally

normal

output

design is such

%.

A 4 millivolt magnetic cartridge will

12AX7 is fed to

suchasradio

are

it

has

no distortionornoise.

the

tone controls

and

the are

of

the

preamplifier

that

signals of

cpsatthe

point

and

usedina network' which is com-

all

components

volume control. Signal levels to

about

any

tape

one

the

proper

and

tape

parameters

carry

signalsatdistortion

output

another

can

of this section.

section of the

also select higher

preamplifier.

This

are

encapsulated.

are

the

filter switch,

volt (which is also the

stage).

magnitude

However,

canbehandled

equaliza-

head

are

network

the

without possibility of overloading the power amplifier

inputs.

he

Power

Each

Amplifiers

power amplifier is on its individual

printed

circuit

module. use is

is dc

thedcoperating from cathode to stage.

that

the values of its associated resistors.

inversion is unaffected

Careful investigation

parameters for

The

These

madeofthe

The

first stage is a pentode section of a 7199 tube.

directly coupled to a cathodyne

feedback is

The

its

phase

The

phase

output

are

truly

unique circuitsinwhich optimum

components.

phase

inverter. Negative

taken

from cathode to screen to stabilize

pointofthis cathode

cathodyne

inversion capabilities

inverter drives a

has

the

output

pair. A positive feedback loop

augments

inverter

by

tube aging

determined

tubes

has

pair

the

amplification of the

the

unusual

are

dependent

The

accuracy of phase

and

similar variations.

of 6BQ5

the

and

output

transformer designed for the circuit

This

advantage

solely

on

output

tubes.

precise operating

transformer.

(DYNACO Z-565) provides maximum linearityinthis configuration. This

transformer representsanadvance in artasit handled

small size.

permits

throughout

the full power of

the

It

also permits a high

audio spectrumina

complete stability of operation

the

order

under

the

stateofthe

output

tubestJbe

unit

of very

of feedback with

all amplifier load

conditions.

Contrary

is

used formance of match carefully

The

Power

The wave rectifiers using silicon diodes. ings

are

for individual

The resin which serves the from

the

to traditional usage, a single cathode resistor

for

all

four ou.tput tubes.

the

four

matched

output

Supply

stage,

tubes.

for this circuit.

SCA-35 is poweredbya power transformer

includedinthe

hum

power transformer to provide means

adjustmentsoneach

power transformer is impregnated with

dual

core

and

prevention of noise

GENERAL

WIRING

This

improves the per-

butitmakesitdesirable to

The

output

tubes supplied

Separate

heater

stereo channel.

purpose of

PRACTICE

and

heat

dissipation

vibration.

an

and

wind-

epoxy

are

full

Assembly of the SCA-35 is exceptionally simple when compared to are

supplied with

ing

parts

way

that

of

the

SCA-35 should

When the

parts

by

matching them to

that

of other similar kits.

all

components mounted,

arranged

on

the chassisinan

makes wiring quick

take

you

list

unpack

first. You

the

kit, check

can

parts

The

circuit boards

and

the remain-

open,

uncluttered

and

easy.

The

construction

no more

than

a few hours.

the

components

against

identify unfamiliar components

illustrated

in

the

pictorial

diagrams supplied.

Have

the

proper

your

kit. You will need a pencil-type soldering iron of 30to 60-watt rating; long-nosed pliers; diagonal cutters; a screwdriver.Ifyou have a soldering gun,itshould be with care, especially when working because of not

its

essential, a wire-cutting

considerably; these

toolsathand

higher

are

before beginning to build

than

necessary

and

available for less

and

used

on

the

circuit board,

heat

output.

Although

stripping tool will help

than

a dollar.

7

J

The

only

procedure involved

which requires a

easytomaster.

quite solder connection:

1.

Make

a good mechanical connection.

2.

Heat

both

3. Apply solder to runs.

4.

Allow

the

ALL

SOLDERING

CORE

SOLDER.

in

building a

bit

of technique is soldering,

There

are

four steps to making a good

parts

of the connection with

the

connection

connection to cool undisturbed.

MUST

BE

DONE

the

untilitmelts

WITH

Dynakit

and

iron.

ROSIN

this is

and

WRONG

Thereisno core solder use is solder 60/40

the

two

bol (S-2) is shown; when

the five is shown, do connection before soldering.

pictorial diagrams. Capacitors Resistors will be the is may

one In from

plainly or (60%

Whenever one

instructions will

(2)

symbol (S-3) appears, etc.

(5)

Components

color code specifiedinthe

nearest

be ignored.

A

numberofstepsinthe

endofa wire

each case, first

the

%" of insulation from

The

tion. are

used, nection to be terminals should follow as

possible.

wires

do vibrationorsagging, unless, of course, to

the

same

lated

wires

the

chassisorbottom

Check

thatithas

isfied vided

and diagrams often; if amplifier should workassoonasthe

One of nection is thentocrimp

The

amount exactly the

isnoneedtowrap one time,asthis makes a connection

difficult

lit

excess touching

to

warranty

has

been used.

marked

solder of doubtful origin. Recommended solder

tin,

40%

(l)

wires

are

wires to be soldered to a connection.Ifno

not

solder;

can

marked

the

endofthe

...

roll

supplied

leads on components should be trimmedasthey

the

length chosen being

made

or

components. that

showninthe

Care

must

not

touch

point.Itis especially

and

component

your

work

been

go ontothe

you

the

best

to

bend

this

of bare wire exposedatthe

-inch; however,ifit

remove ifanerror

on

any

equipmentinwhich acid

Make

sure

"ROSIN

lead)

wire is to be soldered to a connection,

indicate

to be soldered to a connection,

further

be identified

resistor,

", with

cut

a piece of wire to

with

each

from

be exercised to see

each

plate

after

correctly done,

ways to

a small hookinthe

hook

onto

another

the

wire

CORE."

rosin core.

thisbythe

three

(3)

wires

There

wiring will be

by

are

either

with

instructions.

and

instructions begin,

the

lengthofthe

the

kit,

and

end

before making

that

pointtopoint

The

position of all wire

pictorial

other,

and

important

leadsorterminalsdonot

accidentally.

each

step,

and,

step.

Examine

your

work methodically,

make

a good mechanical con-

the

terminal to be connected.

is too long,

terminalorthe chassis.

around

has

been made.

the

that

the

solder

you

Do

not

use cheap

symbol

are

maybeas

comparison with

individually marked.

their

any

the

then

which permits a con-

without

diagramasclosely

cannotdoso

they

when

mark

wiringiscomplete.

end

terminal more thatismuch

(S).

When

the

sym-

to be soldered,

many

symbol

madetothat

values,orwith

The

first color

fourth color

wire specified.

correct

remove

that

are

that

you

the

the pictorial

of a wire,

end

need

thereisdanger

band

"Connect

length

about

the

connec-

strain

leads

uninsulated

through

connected

uninsu-

touch

are

space pro-

your

not

There

than

more

the

sat-

and

To

transfer

the

tip

solder.

is

used, a cloth

correctly tinned,

as

nection directly to illustration soonasthe

on

components (resistors and the wires to eyelets on

numbered for identification,

To

be

ingitwith

of

is wire correctly right, above, which shows a smooth to wire.

If

the

or

The

circuit

soldered in place.

other

solder a wire to them, first

then

heated

insertedassoonasthe

heat

from the iron to the wire

of

the

iron should be

this is properly done

tinning

sponge every few

almost

sections of

made

maybemaintainedbywiping

the

immediately.

the

parts

to be soldered,asshowninthe

above,

solder flows freely.

the

and

boards of

iron

and

with

the

connection looks like the illustrationatth

minutes

tip

will

heat

Solder

both

iron

the

SCA-35

and

cap;:lcitors)

The

circuit boards

the

amplifier channels

the

boards.

are

"tin"

flowing

tip of

the

solderinthe

and

terminal,

kept

brightly

the

first time

while soldering.

both

should

and

solder removed

are

These

filled with solder already.

the

bared wirebyheat-

solder

over it.

iron,

and

transition

tinned

the

iron

the

tip with

When

partsofthe

thenbeapplied

middle

supplied with all

already

are

eyelets, which

connected

by

The

the

endofthe

eyelet

from

mounted

soldering

eyelet

flows. A

eyelet

with

con-

are

is

as

to

8

-

fRONT

1(/)Place

are

facing you,

at

the

pictorial

be

sure

pilot

light

with a

lockwasher panel

smallest

(v'>

Install

2

the

pilot

%/f lockwasher on

shaft nut.

Before tightening

necting lugs of

)n

the

("""'"

Install

3

Place

and

secureitfrom

fore tightening

the

connecting lugs shown on

and

see

(\A

InstaIl

4

using lugs

as

(v,

Install

5

with

%" hardware, positioning

..,.as showninthe

6(

I"}

The

switches

power switch from

out

nearest

ing lugs

diagram. threaded Install

fierted

VJ

The

7(

three They cutouts--their

NOTE: called

lorinthe

PANEL

the

front

bottom~

that

socketatthe

#4

which

size

the

light (see

through

diagram.

the

a %" lockwasheronthe

that

the

%"

hardware

showninthe

the

power switchisthe

with

areinthe

The

anddonot

the

from

shouldbemountedinthe

The

selector

MECHANICAL

panel

before

with

the

asinthe

diagram

you

are

proceeding correctly.

screw

inserted

and

nut

from

is toward

supplied

treble control

the

panel,

the

control

bass control (167205) in

the

nut,

the

bass control is positioned correctly.

balance control (167754)inthe

and

pictorial diagram.

volume control (177254)inthe

pictorial diagram.

only

two connecting lugs.

the

pilot

light socket so

position showninthe pictorial

slide switch

require lockwashers

power switch

the

front side of

remaining slide switches

orientationisnot

switch

instructions.

should

yousothat

rectangular

pictorial diagram.

before

and

extreme left

from

the

inside

you).

The

with

the

(marked

pictorial

shaft

and

the

nut,

are

outside with a %/f

observe

positioning

only

inside,inthe

with

the

notbeinstalled

ASSEMBLY

its

"wings"

switch

after

endofthe

the

outside,

(the

#4

screws

kit.

167504) next to

diagram).

before inserting

secureitwith a %"

see

positionedasshown

the

shaft,

insert

the

pictorial diagram

the

connecting lugs

one of

rectangular

that

mounting

two

#4

panel.

three rectangular

important.

cutouts

Refer

each

step

Install

panel

and

sideofthe

are

Place

that

the

next hole.

the

shaft,

nut.

orientation

Install

its

connect-

holes

and

nuts.

screws in-

are

identical.

until

later.

the

con-

Be-

hole

slide

the

cut-

are

when

to to

of

4(~The

5(

~Connect

6(vrConnect one

a

7( ...,--connect one

a

8(..-)

9(

~bserve,

numbering of

the

on red

other

trollug trol lug

lug

Twist nect

#

control

which

wired to by modules exactly to insulating sleeving on the leads modules should be connected whileintheir

position.

The the bass control so visible; this the the

flat connected the like

pictorial diagram.

wiretotreble control lug

end

to bass control lug

one

#2

#2.

# 5. Connect

#6(8).

#2.

Connect

#1

(8).

together a

one

endofthe

4.

Connect

lug

on

the

PEC-555002 tone control modules

the

carefully Gutting

Lead

#1

#2 #3

#4 #5 #6 #7

PEC

modules

picture.

front panel. After first module,

againstitin

to

controls.

the

diagram.

the

lugsonthe

Connect

end

(8).

end

the

#5

(8).

the

bass, treble,

2/f

1

of a 2

12"

green wire to treble con-

Connect

of a2"red

the

of a2"green wire to bass control

the

5"

same

pictorial diagram, the

the

other

black

and

black wire to

endofthe

and

the

leads of

the

following lengths; slip black

2"

Ph/f

1%" 1114" 2"

DO

NOT

CUT

should

Place

the

that

module

the

terminalsonthe

The

complete assembly should look

be connectedasshown

first module flat

the

numbers

connects to

all

connections

second module will be placed

same position,

controlsisshown

one

#5

#5.

other

wire to bass control

end

endtobalance control

volume controls. Begin

as

lo/i" of sleeving 1%" of sleeving 1" 1" 1"

1%"of sleeving 3%"

end

(8).

end

to balance control

a

5/f

red

balance

red

wire to balance

one

of

specified.

of sleeving of sleeving of sleeving

of sleeving

markedonit

terminals

and

rear

of a

Connect

to bass con-

wire. Con-

control lug

manner

the

The

against

nearest

are

made

its

sections of

2Vz"

the

in

are

circuit

PEC

final

in

the

are

to to

leads

These gether some wires. tightlyorthe twistissufficiently will remain together;

1(

2(

3(""'f

A

~.

instructions frequently specify

0"

Twist of one wire to the

same

lug

#2

.)ater

v1

Twist they ing

ends

pd

of

Cut

each Connect power to

power switch

fRONT

wire

together two9"green wires.

endofthe

(8).

be connected to

together a

are

evenatone end.

to power

the

other

leadofthe

one

switch lug

PANEL

This

twisting should

may

cut

tightaslongasthe

thereisno

pilot

light

The

opposite

12%"

switch

wiretopower switch lug

leadofthe

#1

lug

WIRING

through

need

socket lug # 1

other

wire to

ends

the

main

and

a Connect lug #1.Connect

.02

mid

.02

(8-2).

#2

Connect

(8-2).

that

you

twist to-

not

be done too

the

insulation.

wires

are

for excessive twisting.

Connect

(8).

pilot

light socket

of these wires will

chassis assembly.

15/f

black wire so

oneofthe

disc

capacitor

mfd

disc capacitor

the

neat

one

Connect

match-

the

#2.

to

other

The

and

end

that

same

1;2/f.

lead

10( 11("") 12( 13( 14(~Connect 15(

16(...-r

17

to

..,

Connect Connect

"'1'

Connect

-?l

Connect

~onnect

Connect

(V)

The

remaining PEC-555002 will nowbeconnected.

First, carefully lengths lating

Lead

PEC

lead

PEC

lead

PEC

lead

PEC

lead#4to bass control lug

PEC

lead

PEC

lead

PEC

lead

cut

and

slip

sleeving on

#1 #2 #3 #4 #5 #6 #7

#1totreble control lug #2

to treble control lug

#3

to bass control lug

#5

to bass control lug

#6

to balance control lug

#7

to volume control lug

its

leads exactly to

the

specified lengths of black insu-

the

leads which require it.

2"

7/s"

10/0" !

%"

lI

IVz

DO

NOT

CUT

1%"of sleeving

No

3%"

the

sleeving required

of sleeving

-

#4

(8).

#6

(8).

#4

(8).

#5

(8-3).

#6

(8).

#4.

#5

(8).

following

9

18

(~

Connect

19 (

'1'

Connect 20(,)Connect 21

(~

Connect

_

22(..{

23(,,1)

24(~

25(

26(

27 (

28

29(~Connect one

Connect

v('Connect

lug

~Connect

filter switch lug

switch lug # 5.

~

Connect one

lug

trollug

(0'

Connect one switch lug ance

lug control lug

30(~nnect

lug trol lug

31 (~Connect

switch lug stereo-mono switch lug which this

(v)Connect one

32

#2 switch lug switchesasshowninthe

33

(~wist

nect

#3. ance

34(

~onnect

control lug ume

35(vr-Connect

control volume control lug

36(

~nnect

orange) resistor to loudness switch lug the

37(~

38(

39M

Connect gray-orange) resistor

9'>nnect

..,..

Connect one loudness switch leadtovolume control lug #

Cut a %" piece of insulating sleevingonthis lead connectitto loudness switch lug nect

PEC

lead

PEC

lead

PEC

lead#4to bass control lug

PEC

lead

PEC

lead#7to volume control lug

one

lead

#1.

Connect

one

leadofthe

lead

#3

(S).

Connect

#4.

leadofanother

#6

control lug

end

#4

(S-2).

#3

one

end

#1

(S-2).

#6

(S).

one

endofan

#5

lead

end

(S-2).

one Connect

control lug

control

other

one

the

Connect

#5,

togethera9"

endofthe

the

one

end

#3

lug#1.

one

end

lug

#4

one lead of

lead to volume control lug

one

leadofthe

other

lead

leadofthe

other

# 1 to treble control lug # 1 #2

to treble control

lead

# 3 to bass control lug # 1

#5tobass control

lead

#6

to balance control lug

of a 10ofcapacitor

other

lead to filter switch

other

#4.

Connect

of a 3.3nfcapacitor

the

(S).

Connect

#3.

of a

6%"

Connect

(S).

of a

6%"

Connect

(S-2).

is positionedinthe

of a9"red

the

positioning this lead above

green

black wire to balance control-lug

same

#2

(S).

of a

(S-4).

Connect

of a 3

(S-4).

#4.

an

to volume control

of a 22oftubular

lug

#1

other

lead

to volume control lug

the

other

lead to balance con-

3.3ofcapacitor the

green wire to filter switch

the

other

red

wiretofilter switch

the

other

1

8

12'"

green wire to filter

Conn'ect

#4.

Note

wire to filter switch lug

other

end

pictorial diagratp.. anda9"

endofthe

3Vz"

black wiretobalance

the

1

/2"

black wire to balance

Connect

18,000

other

18,000

to

loudness switch lug

(S-2).

8.

22ofcapacitor

lug

to filter switch

10nfcapacitor

other

lead to filter

to filter switch

other

end

to volume con-

the

other

the

diagram.

to stereo-mono

black wire. Con-

green wiretobal-

other

the

other

ohm

(brown-gray-

#1.

#4

ohm

lug

capacitor

Connect the

- .

#4

(S-2).

(S).

#3

(S). (S).

#2

(S-3).

#3

(.8).

#3.

#2

(S).

lug

#2.

to

to filter

lead to bal-

to volume

end

to

manner

endtovol-

(S-2).

# 1

to

#7.

the

end

Connect

(brown-

#4.

(S-2).

other

I".

Place

and

Con-

in

to

40(

~onnect

lug

control lug

41

(~Connect

switch lug

...;rme control lug

42(

1'5

Connect orange) resistor to stereo-mono switch lug

nect

43 (0'Connect one lead of the

black-orange) resistor to stereo-mono switch

#3.Connect

lug

44

(....f

Connect switch lug

45(v1"Connect

switch lug

This

completes

(.I)

Place Four with

in

diagram; Use a washer When outs,

.J)Ot touch

(~

There with each of shown from over diagram

on

Set

time.

REAR

nection check to see panel which is still switch. present

1

2

"-

one

end

of a2"red

#2

(S).

Connect

#8

(S-2).

one

end

#5

(S).

#7

one

lead of a 10,000

other

lead to stereo-mono switch lug

#5

the

that aside

the

identical

four

each

#4

mounting

center

are

four screw terminals.

on

the

(S-2).

one

PANEL

of

-ihese

and

the

-

end

#1

(S-2).

end

#3

(S-2).

the

front panel sub-assembly.

front

panel

this has been done

empty

the

front

MECHANICAL

rear

panelsothat

input

sockets on it.

the

cutouts

strips

screw,

nut\

the

stripssothat

the

chassis.

two identical

two

the

pictorial qiagram; these

outside.

screwatthe

instead

of a lockwasher.

7 each hole.

3(V"fThere

(~ount

4

should

5(vJ

6(

~he

fits a hole

are

two AC convenience outlets.

in

of these in

the

inside. Use

holder sideofthe against to

fasten

B. .

lug

I~>the

two

the

position of

pressing panel

each of

pictorial diagram.

the

fuse holder.

be fitted

beforeitis insertedinits

panel. While pressing

the

panel,

it

,in

.,.-

rubber

hum

controls

the

in

them

firmly

from

the

#4

place.

the

inside.

wire to loudness switch

the

other

end

to volume

-

1

of a 2

12"

green wire to loudnes

Connect

(S-2).

other

of a5"green wire to stereo-mono

of a

shoulld have been soldered;

will

panel

socket strips

are

inserted

for

each

two

cutouts

Be

suretomount

place

the hardware.

against

use

Note

grommet for

are

locating lug on each control which

chassis.

into

the

other

endtovo

ohm

(brown-black-

#4

other

10,000

lead

to stereo-mono switch

4"

red wire to stereo-mono

The

later

be filled by

sub-assembly for the

its

Mount

as

shown

mounted

from

mounting hole.

stripsinthe

the

output

cutouts

The

the

terminal strips,

Mount

providedatthe

indicatedonthe

The

rubber

the

shoulder of

special

position of connecting

"snap-in"

Snap

the

mounting

ohm

Every

hole in

the

ASSEMBLY

"wings" face you.

are

supplied,

one of these

in

the

from

the

outside, a lock-

two large cut-

metal

portions do

one

of these

strips

the

ground lug

Use

#4

Mount

provided,asshown

outlets

the

mount

washer provided

hole, from

the

fuse holder

%"

circular

line cord in

types. Observe

theminplace

holes on the

#1.

Con-

(S-2).

(brown-

lug

con-

the

front

selector

each

pictorial

inside.

NOTE:

each

in

locations

mount

pictorial

hardware

one

from

the

fuse

the

out-

nut

its

by

10

REAR

1(

~There

\,

2(~Connect

3

(/

4(iConnect

}he

5(

tI)

6(

0'Connect

L?"Note

7(

~(.4'Connect

U"

are

a total of sixteen

panel; the

number, shown

one

end

of a lugs between sockets endtothe and

#4

(8).

another between the

Connect between lugs between

between

#5

short lugs between

another

#9

one

#13

short lugs between # 15

Connect

lugs between endtothe

lugs between # 15

remains free for

input

#2,

sockets

#

1,

#2,

and

to to socket # 10,

one

the

circuit module to

#3

and

#1

lead

2 to socket

lead 4 to socket

the

following lugs: lead 1 to socket

the

short lugs between

to socket # 12

9(

0'

length of flat, 4-conductor cable

plied

with one 10" long rate

the

four wiresateach

about

11;2", ends. Connect lugs of

The

)pter.

10(!""')

11

(i

i.2(~

Connect the

The later.

(0

Connect one

(8-2). thatitcan gether

Connectanend

the

Brown to socket # 5

Redtosocket

Orangetosocket

Yellowtosocket

opposite

one

long lugs of

Brown to socket # 13 Red Orange to socket # 15

Yellowtosocket

opposite

Bend with

PANEL

center

(long) lug of each socket

in

1112"

pair

of short lugs between sockets

1

and

#6

1112"

and

# 10,

#11

more

and

end

of a

#7

and

WIRING

the

pictorial diagram. Connect

black wiretothe

#1

and

1

12"

black wire to

(8).

#7 black wire to

and

#12

11;2"

black wire to

#14

(8);

11;2"

#8

short lugs between

end

of a

2%"

and

# 16

the

present

method

0 to

other

the

and

input

be identified

other

of connecting

#4,

and

#2.

the

short lugs between # 1

#2,

#4

PEC-555003

lead

3 to socket # 11

(8).

kit.

Cut

and

the

other

strip

one

endofthe

sockets in

ends

are

endofthe

the

input

to socket

ends

are

end

of a 101;2"

the

free

endofthis

wires.

of a

101;2"

the

to

Connect

lead 3tosocket (8).

the

If.t'' of insulation from all 16

#6

not

12" piece of flat cable to

#14

nottobe connected

later

input

sockets on

#2.

Connect

and

the

black wire to

(8-2).

black wire to

long lugs of sockets # 1,

the

#9

12"

(8).

# 7

#8

socketsasfollows:

#16

red

the

#8.

other

endtothe

(8).

and

the

and#16.

Connect

#15

and

(8-3).

time.

The

the

short lugs between

lead 1 to socket

input

circuit

and

# 10,

(8),

has

cable

into

long.

Carefully

end

of each piece for

!O"

piece to

the

following

(8).

to be connected

(8).

red

wiretolug''''#10

wire to

whenitis twisted to-

wire to

the

has

pair

of short

the

short lugs

other

end

the

short lugs

the

short lugs

other

end

the

other

#16.

the

other

PEC-555003

#3

module

#9,

lead 0

lead

and

lead 4

been 'sup-

two pieces,

the

manner:

markitso

lug

#9

(8-2).

other

short

(8),

2 to

sepa-

long

until

rear

#3

to

end

and

13 ( vt'

Connect

short lugs between sockets

Twist

a

this

nectedtolugs

14(~onnect

(8-2).

15(~

16(~Connect one

17

Connect

.

Y:;-2).

of short lugs between sockets # 1 Twist nectedtolugs

(..-1'

The strips the

bare wire

of endtooutput

18

(wi.!

Connect one lug minal

19(,;(Connect

in

#4

a piece of bare wire across

which correspond to amplifier will furnish a signaltoa derived channel speaker connection

20(/(

21

22(

23 (

24

25

26( )

panel sub-assembly. soldered connections. present.

Connect one AC AC

(0'Connect one

AC of

.....,

Connect the lug

~onnect

the

(6Twist

end control

to lug

(v(Twist

end control to lug

Insert

"GRND"

of for amplifier.

This

Bend

this

lugsonthe

are

pictorial

the

upper

on

the

strip

(8).

Feed

output

(8).

outlet

outletB.Connect

the

fuse holder

left

#2

right

together two 11" green wires. Connect one

of one green wire to lug

(8).

#3ofthe

together two 11" green wires.

of one green wiretolug # 1 of

(8).

#3ofthe

a sheet-metal screw

above

the

chassis.

an

external

completes

one

end

of a

12"

wire together with

#9

and

# 10.

one

endofan

the

free

one

endofan

wire

together

#1

rearofthe

numbered

diagram~onnect

to

the

ground lug on

output

lug

end

mounting

(8-2).

one

end

of a

the

other

lug

#3

On

the

speakerifthis

connected

are

coveredinanother

end

A. Connect

B.

endofa

one

end

hum

control

of

the

right

one

end

hum

control

Connect

left

Connect

the This

ground wire when installing

the

first portion of work on

Note

8et

8%"

endofthis

8112"

11

and

#2.

from # 1 to # 8,

terrpinal strip.

ff8. '

of a

4"

screw of

2"

bare wire to

endofthe

(8)

and

outside of

#4

wire is removed

in

its place.

of a

Ph"

the

1"

the

(8).

of a2"black wire to lug

(8).

hum

of a

10"

(8-2).

the

hum

the

right

hum

input

will furnish a connection

that

aside

black

wire to

#9

and

# 10

the

two

red

green wiretolug

wiretomark

green wiretolug

%" black wire to

and

with

the

green wires con-

output

black wire to

connectitto

the

and

#8

black wire to lug

other

black wire to lug

other

Connect

control.

black wire to lug

same

control

same

control

in

sockets, from

there

this

screw

as

one

end

the

mounting

Connect

the

upper

output

wire

through

back

panel

two screw

output

Instructions

section.)

end

to lug

endtoterminal

the

other

#1ofthe

endofthe

(8).

Connect

the

endofthe

(8).

the

hole

are

several non-

assembly for

the

pair

(8-3).

wires con-

the

# 2

(8-3).

terminal

shown

of a l,,%"

screw

the

other

the

ground

output

lug

the

output

connect

terminals

lugs.

center

and

a loud-

for

#2

#1

#2

end

#2

left hum

other

right

other

marked

the

outside

point

the

of

#2

it.

#1

pair

on

ter-

#7

hole

lug

(The

this

of of

of

B

of to

of

wire

one

hum

wire

'.

the

rear

the

1-

MAIN

1

(~ss

Z-565 through

front of

the are leads which pass five

Before four

with cable clamp screwsasindicatedonthe

the and

lug, nut

2(V)

Pass

through of

the

in

the

with on diagram.

NOTE: outside

assembly

3(....-)Use

transformeratthe

tion black closest to

.

~ds

4(V)

Before stall V-8onthe components sockets tion. Refer to tion.

bottom

washer

5

(~Mount

bottomofthe gram, board.

~ween

6tv"'5

Mount position shown hardware, from

v5"

Install

7(

the the secure

8

(1,1'

The 1(0) the

chassis; note

on

the pictorial diagram. in

this provided, from diagram

located. %-turn

firmly

12

CHASSIS

the

leads of one of

the

correct

in

two groups:

other

leads which

attaching

setsof#8

the

kit),

MECHANICAL

the

two holes provided

chassis (see

location).

through

the

hardware

mount

under

two of

the

The

leads of

the

orange, black,

the

pass

transformertothe

(the

a 5-lug terminal

the

pictorial diagram.

lockwasher between

between

and

under

the

nut

under

all

the

cable clamp.

leads of

the

two holes providedatthe

chassis, observing

pictorial diagram.

#8

hardware,

one

of

the

mounting

Instructions

the

instructions.

#8

hardwaretomount

United

for

States.

indicatedonthe

and

yellow leads should pass through

the

rearofthe

through

mounting

the

on

four

each

the

sockets

top

of

are

mounted).

boarddonot

the the

the

Use

#4

hardware;

of

the

circuit

and

nut

from

the

two

PC-lO

the

and

terminal

other

nuts.

the

power transformer PA-774

the

Mount

and

install

screws

PB-028. a 120/240

willbefoundatthe

rear

of the chassis,inthe

pictorial diagram.

chassis,

other

hole. .

two

PC-lO

supplied

boards

pictorial for

insert

board

the

top.

circuit

chassis,asshownonthe

using

four

setsof#4

Note

their

orientation,

the

boards.

the

PC-11 preamplifier

on

the

bottomofthe

the

two filter bottom of rear

corner, using two sets of # 4

each

wafer.

capacitor

the

chassisinthe

four-section filter

mountsinthe wafer

the

position of the symbols

underside

.of

the

The

position.

Then,

with

against

Insert

the

top of

to

'see

that

twist

pliers, while holding

the

wafer from above.

hardwaretomount

pictorial diagram, using

capacitor

nearesttothe

capacitor,asshownonthe

capacitor

the

mounting

the

markings

each

ASSEMBLY

output

transformers

nearest

pictorial

rear

through

diagram

the

transformer

and

chassis hole;

the

front hole.

yellow

chassis with

largest

transformer

size strip

mounting

supplied

and

Insert

nut

and

cable clamp,

strip

mounting

Do

not

tighten

rear

corner

lead

orientation

the

shown

transformer

a 5-lug terminal

as

the

volt

other

shown

transformer

endofthe

Z-565

The

in

for regular

output

orange,

the

and

the

remaining

circuit

for V-5, V-6, V

(the

side on which

Note

that

faceinthe

the

and

boards in-

-7

the

pairs

same

direc-

correct orienta-

screws from

install

the

boards from

pictorial dia-

and

leave

air

space

circuit

boardinthe

chassis.

mounting wafers from

cutouts

provided

hardware

(marked

60/40/20/

center

stamped

must

be

mounted

lugsinthe slots

the

chassis; check

are

correctly

of

the

mounting

the

capacitor

the

for

and

the

strip

the

use

posi-

holE!

~d

the

lock-

the

each

#4

at to

of

the

lugs

~The

9(

same procedureasin to install 50/50)

symbols are

differently positioned

capacitor.

inserting

The

leads of

than

longer with former

proper

is necessary to

lead

lead connection point, following diagram. After %"ofthe the

end

insulation

by

heatingitand vents fraying cal bond before soldering.

1(

..('

Connect former to section filter capacitor.

position.

2 (

\t

Connect

former to lug

section filter capacitor.

"'position.

3

(V'J

Twist white leads from

front

of

to

leadtopin

4 (

~Twist

output chassis. Connect

(S).

of

5

(V"')

Connect

Twist

white leads from to

the white and-white lead to

6( vf

Twist put

transformer nearest to Connect nect

the

7

(vr--Twist

transformer leads to

8(

~Connect

.

~

#5

9 ( J.1""Connect

Jp-mounting

10(0"Twist

from

the

cable clamp,

lug # 1 of terminal

and-white

NOTE:

into

the thereby other

11

(prTwist

from

the

cable clamp,

the

two-section filter

in

the

remaining wafer.

stampedinthe

undersideofthe

than

Mount

and

MAIN

the

positioning. In

the

two-section filter

twisting

its

CHASSIS

transformers

make

mounting

WIRING

may the

each

is to be connected, first

the

path

cutting

the

from

proper

the

endofthe

length of

applying

strands

the

lug

and

red

#4

ensures

lead from

(square

a more secure mechani-

the

See

the

red

lead

from

the

#4

(square

See

together

the

#7

together

transformer

together

rear of

leadtopin#7of V-5

together

the

blue-and-white

the

output

chassis. Connect

of V-7

#9

(S).

of V-7 the

blue

Connect

(S).

nearest

the

blue lead to

the

green

the

blue-and-white

the

output

the

chassis.

#9

the

blue

transformer

the

and

leadtopin

Connect

(S).

of V-5

and

the

blue

leadtopin

green

together

leadtopin

the

two red leads from

#9

PA-774. Connect

lug

#4

of terminal

the-

other

red power transformer

of terminal

the

red-and-yellow power transformer lead

strip

lug.:Aofthe

together

the

brown

strip

TS-l.

four-section filter capacitor.

and

power transformer.

and

connect

strip

TS-2.

leadtolug

These

transformer leads

eyelet

providing

wires

tobeconnected.

together

the

power transformer.

that

and

#2

holds

more

green

connect

of TS-2.

the

space

and

Pass

-

preceding

capacitor

stepisused

Note

(marked

that·

the

capacitor

for

the

other

filte

capacitor

lugs.

often be somewhat

connections required

case where a trans-

run

the

lead to

showninthe

lead,

the

pictorial

lead,

and

strip

"tin"

solder to it; this pre-

rear

output

symbol) of

the

trans-

four-

pictorial for wire

front

output

symbol) of

the

trans-

four-

pictorial for wire

and

green-and-

nearesttothe

blue-and-white lead

the

green-and-white

green leads from to

the

front of

#7

#9

of

and

green-and-

transformer

nearest

the

Connect

the the

of

N-

V-B.

blue-and-

the

green-

(S).

green

leadsofthe

rear of

#7

of V-6

the

chassis.

(S).

out-

Con-

of V-6.

the

power

either

one of

the

red

TS-l.

lead

brown-and-white leads

Pass

the

leads

under

the

brown lead to

Connect

the

brown-

shouldbeinserted

terminal to

on

the

lug

the

for

strip,

the

green-and-white leads

these leads

the

green

lead

unde to lug

b

its

to

\

I

#4

of

terminal

white

lead NOTE: into thereby other

12

(nhe

with types although

they

nect

one

#2

the

#4 IMPORTANT: shown hold

the sive

13(""""Connect

diode to other

14( """-Connect

terminal excessive end section filter capacitor.

15

V)

Connect lug capacitor

~6(

v1"'Connect

17

(Vf

watt section filter to

Connect red)1watt the other two-section filter capacitor.

(square

These

the

eyelet providing

wirestobe connected.

silicon rectifier diodes

the

shown

are the

of

the

of

terminal other of

terminal in

pliersonthe

solder

heattothe

leadtolug#5of

to

lug

#3

(semi-circle

symbol)

resistor

lug

#1

four-section filter

leadtolug

~~onnect

-====

19(

20(

21

22(

(semi-circle

tor.

Connect

PC-lO

circuit

~Connect

Ih

watt

resistortolug

the

two-section filter

other

leadtolug

capacitor.

\1"'Connect

(triangle (S-2).

PC-l1

(0'Connect

mounting

Connect the

"'fConnect

lug B of nect section filter

Connect

circuit

same

the

strip

TS-2.

to lug#5of TS-2.

transfonner

that

holds

more

kit

maybeanyofthe

in

the

different

electrically

cathode

rectifier diodes

lead

the connection to avoid

the

cathode

lug

#2ofterminal

one

endofa7"red

strip

heatingofthe

#3

one

leadofthe

(S-2).

one

lead

to lug

capacitor

(triangle

one

leadofthe

resistortolug

one

symbol)ofthe

the

one

lead

one

symbol)ofthe

board

one

leadofthe

lug

the

other

capacitor.

one

end

the

four-section filter

other

capacitor.

in

equivalent. Con-

(or

plus)

strip

TS-l.

of

the

diode

strip

TS-1

Arrange

pictorial diagram.

lead

between

diode.

(or

terminal

TS-1

(S-3).

(semi-circle

symbol)ofthe

Connect

of

the

of a 2200

#4

(square

(S-4).

symbol)ofthe

capacitor

#2

(semi-circle

end

of a 61!z" red wire

other

endtoeyelet

board

end

B of

(S).

of a 22,000

#2

capacitor

# 1

(triangle

of a 61!z"

the

~ther

(S).

the

four-section filter capacitor.

leadtolug

of a

2"

endtomounting

Connect

leads

the

space

supplied

illustration;

appearance,

lead

to

Connect

to

(S-2).

the

diode

plus)

strip

wire to

Use

diodes.

symbol)

50 ohm, 5

the

other

same

ohm

Connect

other

#1

two-section filter capaci-

ohm

(semi-circle

two-section filter

endtoeyelet

95 ohm, 5

black wiretomOlmting

capacitor

the

green-and-

shouldbeinserted

tenninaltothe

on

the

lug for

three

~

UJ

Cl

O~Cl

.~~~.

U

of

lug

~

"

lug

leads

exactly

When

the

application

leadofthe

TS-l.

strip

caution

Connect

four-section filter

capacitor.

symbol)ofthe

2200

(triangle

(S-2).

(S-3).

symbol)ofthe

red

#2

lug D of

soldering,

diode

body

of exces-

Connect

TS-l

(S-2).

lug

# 2 of

to

the

of

the

watt

resistor to

leadtolug

(red-red-red)

the

othef..lead

same

capacitor.

ohm

(red-red-

symbol)

Connect

symbol)

to

lug

#5ofthe

(red-red-orange)

symbol)

Connect

wire

to

lug

capacitor

#12

watt

resistor

(no

symbol)

(S-2).

the

strip,

the

UJ

<t

as

and

second

the

avoid

other

four-

#4

four-

of

the

of

the

#2

rear

of

the

same

#1

on

the

to of

ton-

two-

23( 0

24(

25 (

26(

27(

28(,0Connect

29

30

31

Connect lug

D of

nect

the

cuit

board

v(Connect

on

the wireisalready insert eyelet

V"'Connect

lug

C of

the

other

cuit

board

W"'Connect

lug

C of

nect

the

eircuit

~onnect

V-7

(8).

V-8

(8-2).

(U

Co~p.ect

V-6

(S-2).

(VConnect

(8-2).

of

the

(~Connect

V-7 of

JP.

eyelet

32(~Connect

of V-8 of endtoeyelet

33(

1

~Connect

V-5 of to

eyelet

34(

~onnect

V-6 of

to

eyelet

35(

'1""

Connect V-8 of to

eyelet

36( ....,..-connect

V-6 of to

eyelet

37(

1>'Connect

of front

#10

38(

~onnect

of rear

#10

39(A'"

40

Twist 3"

#3

of

(8).

#5ofV-5.

wiretopin

(V!.wist

2%"

#5ofV-5 wiretopin of endofthe

long.

on

the

one

end

of a 61!z"

the

two-section filter

other

endtoeyelet

(S).

one

end

of a

rear

PC-lO

the

second

#5

on

one

end

the

endtoeyelet

(S).

one

end

the

four-section filter

other

board

one

Connect

one

Connect

.

one

Co~.he

one

end

Connect

four-section filter capacitor.

one

end

the

front

#9

one

the

one

endofa 1Yt" green wiretopin

the

rear

#9

(S).

one

the

rear

#8

one

end

the

front

#11(S).

one

the

rear

#11(S).

one

PC-10

(S).

one

end

PC-lO

(S).

togetherapairofblack

Connect

the

rear

green wiretoeyelet

Connect

Connect #4

togetherapairofblack

long.

Connect (S-2).

#4

black

wiretopin

green

circuit

connected;

wire.

the

front

of a 4

four-section filter

of a 6

endtoeyelet

(8).

endofa

the

end

of a

the

end

of a 1

'of a

the

other

of a 11;4" green wire to

PC-lO

(S).

e~d

of a 1Yt" green wiretopin

front

PC-lO

#8

(S).

PC-lO

end

of a 1

PC-lO

(S).

of a 1

PC-lO

end

of a

PC-lO

end

of a 41!z" green wiretoeyelet

(S).

Connect

of a 4Yz" green wiretoeyelet

(S).

Connect

one

PC-10

the

other

the

of V-5.

one

Connect

of V-5

wiretopin

black

2Y2"

red

board

reheat

Connect

PC-lO

1

h"

black

#6

of

1

/2"

black wiretomounting

#6

11;4"

red

other

endtopin

21!z"

red

other

1

14"

red wiretopin

other

7."

red

.fmdtolug

(S).

Connect

-

(S).

Connect

J

14"

green wiretopin

(S).

Connect

Y2"

green wire to

(S-2).

Ph"

green wire to

(S-2).

the

endofthe

(S).

Connect

#4

endofthe

remaining

endofthe

the

(S-2).

# 5 of V-6,

#4

wiretomounting

capacitor

#4

circuit

capacitor.

the

capacitor

on

wire to

endtopin

encLt.9-Pin..#3 of-V-5,-

wiretopin

Connect

other

and

black wire to

on

and same-end of

Connect

of

(S-2).

on

the

PC-ll

wire to

the

wire to

Connect

eyelet

(S-2).

green

black wire to

endofthe

green wires, black wiretopin

Note

the

eyelet other board

mounting

rear

PC-lO

(S-2).

the

front

#3

pin #3

# 3 of V-5

#2

(no

symbbl)

the

other

the

other

the

other

the

other

the

other

endtoeyelet

wires,

the

same-end

the

rear

the

other

and

the

end

(S).

Connect

PC-lO

# 3 of

of V-8.

#3

of V-6.

# 3 of

# 2 of

#2

# 9 of

eyelet

PC-10

green

V-G.

Con-

cir-

#5

one

and

cir-

Con-

end

other

end

each

end

other

to

of

#2

of

#2

13

--

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

-----

41

(vf

Twist

together a

2%"

long. Connect one

lug

#1

of terminal

to

#5

green wire to lug

Jof

the

green wire to

42(~Twist

j to lug

43 (.,J)

j!!

V!wist

44 (

45(Vf'Twist

/!.f V-8

46

(1'>

WIRING

The

of

the switch. when

itisdone

are

connectedtothe gram shows exactly which wires the

eyelets. wiresinplacebyheating while

checkin~

been

insertedinthe

\

1(

Vl

2('£{ 3(

4(0

together a

10%"

long. Connect one

eyelet

the the strip

Twist

3"

#3

of

2%" wire to

of endofthe

3" the

endofthe nect

Twist 12" long. Connect let green wire to other strip wire

following wires

#9

green wire to

other

endofthe

T8-2. Connect

#2

of T8-2.

together a

long.

Connect

on

the

green wire to

(8).

Connect the

# 5 of V

# 5 of V-7(8-2).

#4oftenninal

PC-11 preamplifier circuit board to To

-7.

#4

together a

long. Connect one

the

black wire to

together a

long. Connect one

green wiretolug

the remaining

(8-2).

together a

#15onPC-11

endofthe

T8-2.

to

lug # 5 of T8-2.

TO

make

Insert

the

LENGTH

5(a

6(

7(~

8(' 9(

~

10(~

H(

12(

)

pair

of green

strip

of V-6

on

front

Connect the

of V-7.

#4

green wiretopin

black wire to

Connect

the

laterinthe

the

eyelet

1%"

2"

2%"

1%"

4"

H

5

1%" 4" 51,4" 1%" 2%"

2"

(8-2).

#2

of T8-2'. Connect

pair

of green

PC-11

eyelet

THE

proper

(8).

eyelet

#10onPC-ll

black wire to lug # 1 of

the

pair

of black

one

end

PC-lO

eyelet

other

pair

of black

Connect

of V-7

strip

are wiring to

circuit

(8-2).

pair

of green

endofthe

T8-2. Connect the same

#5

endofthe

pair

of green

one

endofthe

(8).

Connect the

# 13onPC-11

black wire to lug

the

PC-11 CIRCUIT BOARD

all

to be connected from

assembly process,

board

wires from the top,

the

eyelets from below

numbers to be

eyelets.

and

black wires,

endofthe

T8-2;

connect

Connect one

#4

of V-6

and

endofthe

Connect

other

endofthe and

of the black wire to

(8).

Connect

#4

end

of the black wire to

other

endofthe and

end

of the black wiretopin

the

same

Connect the

# 5 of V-8,

# 4 of V

and

of T8-2.

#5

green wiretopin

and

remaining

the

selector switch easier

now.

are

connectedtoeach

COLOR

red red red red

red I

black green green black green green green

black wire to

the

end

the

(8-2).

bla<;k

wires,

black-wire to

the

same

(8).

green wires, each

the

on

the front PC-lO

green wires, each

endofthe

and

-8.

black wires, each

black wire to lug

Connect

of V-8

sure

(8-2).

black wires each

black wire to eye-

same

(8).

Connect

#4

of

endofthe

the

The

pictorial dia-

and

that

each

other

end

of the

other

end

each

end

of

Connect

tenninal

green wire

eyelet

same

end

green wire

green

other

end

the

other

end

of

the

other

Con-

#4

endofthe

the

tenninal

green

the

top

selector

the

wires

of solder the

the

board,

they have

EYELET

#16

#17 #14

#19

#20 #5. #2

#3

#1

#8 #11

#7'

FINAL

The

top of

With

the a locating lug diagram shows the wafersasA

location has separate lugs wafer, be

1

(n

Connect one lead of a 1.5 megohm (brown-greengreen) resistor to selector switch lug B-2. Connect

2

(Y5

Connect one lead of a 3.3nfcapacitortoselector switch lug B-5 lug B-2.

3

(VConnec1

green-green) resistor to selector switch lug A-2.

"connect

(v'f Connect

4

switch lug A-5

5("-'r"Attach

chassis with four each the

6

(\IfCarefully install the selector switch

panel

the

selector switchismarked

shaft pointing toward you,

protrudes

tenninal

(front)

sure

you

solder each wire to

the

other

lead to lug B-5. .

one

lead of

the

other

one

lead

lug A-2.

the

front

sideinthe

two wires from

under

the

chassis.

as

showninthe

%" lockwasher

switch, front indicates the panel. front of the with a

7(

~Connect

circuit board to lug A-7onthe

B(

if

Connect circuit

9(

lI"I

Connect

>-J;.

lOvP0sition

red Position wafer A (between the wafer the

(8).

11

(~onnect

A-2

C0

12

13( lIIf

14(~Connect 15(

16 17

Connect B-7

Connect B-9

fi-6

"'1'

Position green wire from Position wafer B (between wafers B Connect black wire to B-3

C,j)

Connect

B-2

(\l'.Connect

to lug

insert

panel

and

the

In

the

switch should engage

front panel.

%"

nut.

the

red

the

red

boardtolug A-9onthe

the

(8).

the

black wire from

wire from

the

twisted

main

chassis).

Connect

the

(8-3).

the

(8).

the green wire from

(8).

the

(8).

the

black wire from

the

twisted

the

green wire to lug B-4

the

(8-3).

the

red wire from

A-l.

ASSEMBLY

and

from

the

left front.

numbers,

andB(rear).

on

(8-2).

the'

lead to lug A-5.

ofa.3.3nfcapacitor to selector

(8-2).

panel

sheet

holes provided.

the

on

the

switchinthe

rotateitso

top of

the

this position

Fasten

wire from wire from eyelet

red

wire 'from

eyelet

the red

green wire from eyelet # 8 to lug

green wire from

# 20

pair

Connect

black wire to lug A-3

wire from

'

eyelet

#3

pair

(8).

Wheneveraterminal

the

front

Connect

other

Connect

sub-assembly to the main

metal screws, using two

stereo-mono switch

pictorial diagram.

bushingatthe

that

switchistoward

the

switch securelyinplac

eyelet

and

in

front of selector switch

and

the

eyelet#lover

and

in

front of selector switch

andA,but

the

with a red dot.

the

dotatthe

The

and

identifies

and

backofthe

both

lugs.

the

other

1.5 megohm (brown-

the

other

Note

that

on

frontofthe

hole providf'donthe

the

red

locating lugonthe

the

small hole

#16

on

selector switch

#17onthe

selector switch

eyelet

twist

red

eyelet

twist them together.

eyelet

stereo-mono switch •

# 19 to lug

#5

over to

them

the front flange of

wire to lug A-4

#14

eyelet eyelet

(8).

# 7 to lug #2

closetoB).

Connect

# 11 to

top,

pictori

th

lead to

all

but

pass

the

front

Place

dot

which

the

top

the pc-n

(8).

PC-11

(8).

the

together.

(8).

to lug

to

lug?

to

the

the lu

on

a

of

in

14

-

18(y(Connect 19

(~Connect

a

,'.

to

pair

front

the green wire from

lug

B-lo

the

black wire of

from

the

PC-10

(8-2).

balance

control to eyelet

Thisisthe

. nected to this eyelet. Connect

pair

to eyelet

20(~Connect

twisted on

the

. connected

.)his

pairtoeyelet

21(""'Feed

the light socket through of these wires to

...£onnect

"1'"

Place

22 (

the

panel faces you. Bring

close

to

do

not

four

conductor

wires from

chassis. All

.

23

~tom

(~~nnect

between

fasten in placeatthis

the

pair

rear

twisted

the

main

the

of

the

input

#7

(8).

black wire of

from

the

balance controltoeyelet

PC-10

to

(8-2).

this

eyelet. Connect

#7

(8).

pair

of green wires from

the

lug

#4

other

green wire to lug

chassis

upside

cable clamp. Connect one

the

proper

the

position (also upside

cables

input

and

socketsonthe

other

wires will be connectedonthe

chassis.

black wire from the

sockets # 15

lug A of the four-section filter

24

(Y1'"

Connect the black wire from

tt

output

terminal

25(

"'~onnect

y 774) leads to lug

the the

NOTE:Ifu.inl<

this

26(A

Connect the longer black wire of

terminal

strip one of

other

black power transformer

fuse holder

steP

with

the

strip

T8-l

the

#1ofAC

(8).

the

120/240

steps

specifiedonPage

mounting

(8).

black power transformer

volt

power

power switch to lug # 1 of other

27

( \-("Cut

black wire of this

B

(8-2).

;;able

put

chassis to the

black

Position these twisted wires

clamp.

the

black, orange

transformer Z-565

3/1

leadtooutput

leadtdlug

each.

#2

Twist

(8).

pair

and

nearest

these together

lug

Connect

Jug #1.

28 (

'ItI'f

Connect

lug # 1

/to

29

(./)

Twist from

the Connect the black Connect

.

yellow

30("A'"Connect one

lug

eyelet

31

(itConnect

-hum section filter

.

r1

~

~he

32(11Connect one of

control to lug

Connect

(8-4).

one

end

(8·2).

eyelet

#1

on

together

the

output

chassis.

Place

the

orange lead to lug

leadtolug

end

#5

(8-2).

Connect

# 1onthe

the

black wire from

controltolug

capacitor

rear

panel.

the

other

Position these wires

of a 7112/1

Connect

the

rear PC-lO

black, orange

transformer

these leads

leadtooutput

# 5.

of a

9"

the

front

PC-10

#2

(8·3).

the

green wires from

#1

of terminal

green wire to lug

the

stereo-mono switch

the

red-and-black twisted

#6

second wire con-

the

red

wire of

the

green-and-black

Thisisthe

of terminal

second wire

the

green wire of

strip

#5

down so

rear

that

panel sub-assembly

down),

time. Position

the

twisted three sets of

top side of

ground

and

# 16 to

capacitor

the

(8-2).

ground lugonthe

screwtolug

outletB(8-2).

lead

to lug A

transformer,

16.

AC

outletA.Connect

to lug

PB-028.

the

pair

#2ofAC

under

yellow leads from

to

the

rear of

and

#8.

Connect

the

green wire to

other

the

yellow

output

endofthis

(8).

and

yellow leads nearesttothe under

the

cable clamp.

strip

lug

#8

#6

(8).

Connect

red wiretooutput

other

end

of this wire to

(8).

lug

#2

of

(no

symbol)ofthe

Place

this

wire

the

strip

T8-2

#2

under

the

cable clamp.

on

the

this

#6

the

pilot

-'1'8-2. of TS-2. the

front

but

the

flat

the

lugs

mounting

#3

(PA-

Connect

on

replace

from

the

outlet

the

out-

the

connect

orange

lead

strip

wire

front

(8-3).

the

strip

the

right

four-

against

left

hum

(8-4).

of

T8-2

33

34(.,t

35

36

37(vj

of

38(~ist

to

39 (

40(

41(""') Connect

of

42~

43

44(JConnect

45(

46

THE THE

V

Connect

control to lug

Connect

(8·5).

Now Attach

one of the green wires from

#4

of terminal

the

other

green wire to lug

Position

tighten

the

these

wires

the

hardware

rear

panel sub-assembly to

holding

under

the

strip

the

T8-2

#5 cable clamp. cable clamp.

chassis with four sheet-metal screws, using two on each

side in

(~Pass

mounted enough to tie a Then, for 2".

~

ends

(VConnect

to

lug

conductor to lug

tum

the

Twist

#9

and

between them. Connect

viously

cuit

board shown on of

the connect circuit

nected

wire to lug A-8 of these wires from

the

holes provided.

the

line

cord

in the

rear

panel,

knot4"from

separate

Cut

the

two conductors of

'h" from one of them,

through

the

and

pushitthrough far

the

end.

and

of both. the

#2

of AC

shorterofthe

outletA(8-2).

#1

of

two line

Connect

AC

outletA(8-2).

chassis over.

together the two red wires from

#10

and

the

black wire from

the

red

wire with

bent

endtoeyelet

(8).

(Note

the

pictorial diagram.)

black wire

the

board

to

around

black wiretoeyelet

(8-2).

this

eyelet. Connect

the

#18

on

the

correct wire position

Twist

the

remaining

Thisisthe

the

selector switch

rear

panel

#5

second wire con-

against

rubber

Tie

the

strip

cord

input

the

another red

on

remaining

(8).

conductors

chassis.

together sockets short with PC-ll

#1

lugs betweeft them. Connect

the preyiously

circuit position shown another

tum

green wire

the

on

PC-ll wire connected to ing

green wire to lug B-8 of the selector switch Position these wires from main

chassis.

eI

Connect

)he

the

rear

panel to lug A-I of

D(Connect the orange wire from

/Iug

A-12

(8).

the

A-ll

(8).

Connect the brown wire from

lug A-lO

(v{

Connect lug B-1

lug B-12

VConnect

B-ll

(J

Connect lug B-lO

This

completes

AC CORD

COVER

(8).

AND

(8).

the

(8-2).

the

(8).

the

(8).

UNTIL

BO'ITOM

the

two

gr~en-·Wires

and

#2

and

the

bent

endtoeyelet

board

of

and

circuit

on

the

connect

board

(8).

pictorial

black

the

this eyelet. Connect

the

yellow wire from

the

red

wire from

yeUow wire from

orange wire from

red

wire from

brown wire from

the

wiring of the..-ubit. DO

THE

TUBES

HAVE

PLATE

ARE

from

black wire from the

the

(Note

the

correct wire

diagram.)

wi,re

on

the

black wire to

(8-2).

Thisisthe

the

rear

panel

against

input

socket # 16 on

selector switch

input

socket

input

socket

input

socket

input

socket # 8 to

input

socket

input

socket

input

socket # 5 to

NOT

BEEN

INSTALLED

SECURELYINPLACE.

right

hum

(8-5).

of

T8-2

the

main

grommet

the

knot

line cord

and

tin

the

longer

Now

sockets

short

lugs

the

pre-

PC-ll

cir-

tum

wire

and

the

PC-ll

red

Position

the

main

input

green wire #6

on

the

Twist

remaining

eyelet

# 1

second

remain-

(8).

the

(8-2).

#15

to

#14

to lug

#13

to

#7

to

#6

to lug

PLUG

IN

AND

.

15

PLACES

Be

sure

Compare

showninthe

securely soldered, with enough space between connections

to

the

tube

ofanaccidental short-circuit.

Compare

to

that

showninthe

see

that

lead

length

to

the

chassis.

Examine

that

noneofthem to touch terminal

Check

panel, to be

Check

soldered to see

shorted

a been

applied twisted too tightly. going to V-B,

and

T8-2.

The

wires to

shown below.

and

A4,

the

front surface of

TO DOUBLE-CHECK

that

all

mounting

the

wiring of each of

pictorial diagram. All connections should be

socket connecting lugs so

the

wiring to each lug of

pictorial

all connections

has

not

caused

all

connections with

have solder blobs which

the

bottom

strips

each

sure

the

twisted wiresatthe

condition.

when soldering these wires

pins

#4

to lugs

Note

and

to lugs B3

plate

and

the

lug on

that

the

This

Pay

and

#1,

the

selector switch

particularly

each

screws

have

been soldered,

any

whenitis installed. Check

filter capacitorsinparticular.

eachofthe

all of them

insulation has

will occuriftoo

particular

#5

of tube sockets V-5, V-6, V-7

#2,

#4

and

B4.

wafer.

AFTER

and

the

that

diagram. Check carefully to

connection to short-circuit

particular

controls

have

ends

where

attentiontothe

and

#5

should

the

twisted

These

WIRING

nuts

are

tube socketstothat

there isnochance

the

filter capacitors

and

care,tobe sure

project

been soldered.

they

not

melted

much

and

they have been

of terminal

be positioned

pairstolugs A3

should

tight.

that

on

the

have been

to cause

heat

be close

excess

enough

the

front

has

leads

and

strip

as to

The

bottom time, by which fits outside cover

onto

are

fastened together by four

the

sides of

panel

is installed.

Install sertingitfrom gripping to squeeze spring over place.

The

over

the placedonthe hold

the

attaching

the finish of

if necessary,

the

All secure required. shaft

and

shaft

has a flatted portion,

should be tightened

rotated

is knob

should

The

balance control setsothat 7 o'clock will correspond to 5 o'clock.

balance control operation. However, offset if desired so average volume

The

bass control knob should be

clockwise

that

full clockwise isat6 o'clock.

will

thenbethe

plate

and

the cover

setting

the

control shafts,

panel

them

The

on

the

amplifier chassisonthe

the

main

the

chassis.

the

cover.

pilot

the

jewel

it

open,

the

panel

control

the

nuts

the

panel.

without

knobs of

to

two large knobs go

the

volume control shaft.

fully counter-clockwise,

pointto"Tape

the

full counter-clockwise

a clock face,

point

isat6 o'clock,

The

This

light

jewel

front of

spring

and

jewel

to

should

in

and

electrically "flat"

thenbeplaced

and

shaft

place.

Use

to avoid scratching

The

removing

the

8CA-35 use small

the

shafts. A small tip screwdriver is

against

and

to 12 o'clock for nominally

either

that

the

balanceinyour

and

are

attachedatthe

bottom plate,

chassis,

chassis, bottom should be done before

the with pliers sliding

holditin

%"

bushings

cover

and

the

head".

volume control knobs should be

This

of these knobs

12 o'clock position represents

the

and

then

plate

sheet

metal screws throu

by

in-

panel,

the

nuts

to

care

in

can

afterward

the

front panel.

set

on

the

selector switch

The

selector switch

the

set

screwinthe

flat.

Then

when

the

index

point

corresponds to

then

full clockwise

makes

the

canbeinstalled

individual system.

setsothat

treble control knob

The

12 o'clock position

setting

for each.

lowering

mark

index on

full counter

same

the

and

cove

the

fron

be removed,

screws to

knob

the

knob

on

the

rotation

the

balanced

set

so

Tum

the

chassis upside down,

dislodge

torial TANT: first time, chassis to avoid

tight

tubes

tubes; one of each is closest 6BQ5;EL-84/7189 tubes,

PC-10 sockets.

holes of

machine screwinthe

it

16

any

The

tubes

diagram

When

fit of

and

to

The

four

the

witha#6

wire clippingsorbits of

and

the

fuse should now be mstalled.; shows inserting

the

socket should be

new

are

installedinPC-ll.

the

PC-ll

rubber bottom plate.

nutonthe

the

strainonthe

sockets.

installed

board. V-5, V-6, V-7

Insert

the

feet should be

recessed

and

shakeitvigorously to

sol~er.

location of each tube.

the tubesintheir

supported

circuit

V-I

and

on each

and pilot

To

mount

inside of

board

V-2

are

V-3

and

PC-10inthe

they

go

lampinits

installedinthe

each foot,

endofthe

the

bottom

in

the

pIC-

IMPOR-

sockets for

from below

because of

12AX7;ECC-83

V-4

and

the

socket.

inserta#6

foot,

and

plate.

the the the

are

7199

socket

V-8

are

remaining

corner secure

.

Dynakit transformer PB-028 or 240 volt, 50

For r

1( ) Connect

2( )

3( ) Connect 4(

) Connect

SPECIAL 120-240

INSTRUCTIONS FOR OPTIONAL

VOLT POWER TRANSFORMERS

BLACK

•

VIOLET aWHITE

BLACK

aWHilE

I

.

VIOLET

120·Yol'

8CA-35 amplifiers

canbewired for

or

60 cycle,

20

Volt

Operation

the

black lead from

#1

of AC

to lug Connect

transformer to lug #

fuse holder

the

outlet

black-and-white

violet lead to lug A on

violet-and-white lead to lug A on

(8-2).

,

1 of AC

BLACK

VIOLET

a

BLACK

aWHITE

t

VIOLET

240·yolt

supplied

AC

B.

with optional power

use

with

power sources,asfollows:

the

power transformer

lead

from

outletB(8-3).

the

fuse hoide

WHITE

either

the

.

120

power

the

for

240

Volt

Operation

1( ) Connect

minal

) Connect

minal

3( ) Connect

B

4( ) Connect

. holder

When using

blo fuse should be

recommended for

Although assembly, sometimesanerror ponent

may

difficulty

matic

approachisused.

the

inter-relationship between

circuit,

and circuit will be helpful in achieving suggestions for servicing which follow

the

strip

violet-and-white

TS-l.

the

black-and-white

TS-1

(S-2).

the

black

lead

to

lug # 1 of

(S-2).

the

violet lead to lug A on

(8).

the

240 volt connection, a one

used

insteadofthe

the

120 volt connection.

IN

CASE

your

SCA-35 should function

OF TROUBLE

of wiringora defective com-

require trouble shooting.

can

be determined most efficiently if a syste-

This

is based

the

reference to

the

section which describes

The

different sections of this

understanding.

are

to localize the circuit section which isatfault.

Naturally,

ing

as

a first

you

should

step

check

and

double check

in trouble shooting.Itis goodtohave somebody else checkitthrough for you,ashe error

which

you

be done with

the step instructions. check

on

the

accuracy

ires

and

componentsgoto

that

all

see

parts

or

bit

of solder will

solder connections

touch spots where

overlook consistently.

pictorial diagramsorwith

If

you

use both,

of wiring. Look

the

correct points,

are

they

run

from one

pointtoanother

This

you

will have a double

not

good

should not. Sometimes a

connection is desired. Sometimes a lead is left and

hangs out, touching

should be examined

Another tightly together cause

source of trouble is

that

short

circuits -

with

they

this

or

another

in mind.

break

the

point. All connections

that

wires

through

wire itself

within the insulation if twisted too tightly.

made

One general test should be shooting begins. in

the

SCA-35orin nections to the

pickup cartridge is

Pilot

If

turning see whether tubes.Ifthe then

the

Light

and/or

after

plugging

the

power switch on,

there

tubes glow while

the

fault

loudspeakers

is in should be replaced socket.

connections

If

wiring to two sets of

~hich

\

....

to TS-2 to see

some of

hite.

This

wiring should be traced to see whether

are

correct

the

tubes light,

the

unlighted

heater

is brown

These

and

should be traced from

if

This

is to determine whether

associated equipment. Sometimes, con-

areatfault,orit

not

connected properly in

TubesDoNot

the

SCA-35

the

is a

normal

the

pilot

orinthe

and

soldering makes good contact.

but

others

tubes

wires, a

set

brown-white,

the

wiring compares with

before serious trouble

light

into

an

pilot light does

glowinthe

the

pilot

light does

light itself -

wiring to

do not,

should be traced.

for

each

the

other

the

PA-774 transformer

diagram.

to lug # 1 of ter-

to lug

two

properly

#1

AC

the

ampere

of ter-

outlet

fuse

slo-

fuse

after

location of a

on

understanding

the the

The

based on

checking

only

and

thatnowires

your

may

the

step-by-

to see if

but

trying

wir-

see

can

also to

where no

too long

are

twisted so

the

insulation

may

the

and

be broken

fault

maybethat

the

player.

AC

outlet

and

notgoon,

centerofthe

not

light,

and

the

bulb

the

pilot

light

the

then

the

heater

There

are

channel, one of

green

and

green-

the

pictorial

If

all

the

tubesinone

channel,

interchange

brown-white with green-white whether one of these sets example,ifthe were formerly

the

with

interchange

not

wiring to the tubes,

something wrong with

(which should be

mentinthis for locating

If

neither to check is rating

models).Ifthe

volt to

determine

replace fuses.

higher rating be used.

Siown

The

ment.

should be capacitor each section of of

these

case).

the

source of trouble.

tubes

the

fuse.Ifthis is blown,

should be used, 2

the

Under

fuses

fuse will blowifthere

If

an

ohmmeter

made

terminals.

the

measurements.

over 50,000 ohms

the

of ohms. Any lesser resistance values indicate

an

failureora

nect

four-section

path

wires to each All sections should disconnected - if not,

all

If

one of installed ably

have been

if

the

four-section

failure of

diodes

are

Blown fuses

former

the

silicon diodes is defective,orifithas been

backwards,

permanently

the

silicon diodes. Therefore, if

found to beatfault, both should be replaced.

can

(though

thisisa

channel

the

light,

but

noneinthe

brown with green wires

temporarily

of

windings is defective.

should

lighted,

the

returnedtoDYNA

This

principle of

nor

pilot lamp light,

make

tubes

then

thereisnothing

hut

most probably there is

wiring from

the

Company

substitution

then

anotherofthe

ampere

second fuse blows,

reason for this

no circumstances should. a fuse

(except1ampere

thenitis essential

instead

is a

short

circuit in

of continuing to

is available, resistance measurements

at

the two

Unplug

capacitor

on

all sections except

capacitor

and

four-section electrolytic

the

power cord

to ground before making

The

resistance to ground should be

the

whereitshould be

either

to chassis which

capacitor

read

high resistance once wires

the

four-section

should

not

section to isolate

capacitorisat

capacitor

damaged.Insimilar

capacitor

is defective,itmay

either

also indicate a defective PA-774 trans-

rare

possibility).

this, disconnect all leads of the PA-774 except the two

primary

black they touch

in

the

is

unit dition, the trouble is definitely in is proven satisfactory capacitors except

the four-section filter capacitort leaving capacitor on

then

ated,

anditis necessary to seek a

in

the

circuit.

The

output fuses by removing sockets.Ifthis cures fuse blowing, probably bad. one, twoorthreeofthese

the

remaining tubes is probable. bottom of each tube is normal, black metal a probable put

tube

the

heater

leads;

and

with these leadsinposition where

neither

and

by

wire from lug

each

other

turniton.Ifthe

in

this test,

disconnecting all wires to

#2

terminals.Ifplugging in

does

not

blow a fuse, these components

tubes

can

be testedasthe

all

the

6BQ5's

The

unit

should

four tubes

part)ofthe

shortinthe

sockets,ora

output

tubeorat

shorttothe

wiring.

nor

other

components, plug

fuse blows

the

PA-774.Ifthe·PA-774

test

the

on

TS-l

to lug

the

resistors on

the

unit

short

circuit elsewhere

source of blown

simultaneously

then

one of

never be

operated

insertedordamage to Heater butifthe

glowatthe

plate

tubes glows reditindicates

#3ofanyofthe

chassis of some

to

determine

light which

wrong

transformer

for replace-

is helpful

the

first

for 240

the

equip-

and

discharge

blank

terminal

about

capacitor

exist. Discon-

the

capacitor.

fault.

will prob-

fashion,

cause the

capacitor

To

check for

under

this con-

diodes

the

capacitors

#3

of

and

turning

are

exoner-

from

them

with

top

(the

part

other

and

For

thing

same

of

any

95

are

or

and

the the

it

their

is

only

and

large

out-

of

17

Both

Channels

Should

thatasimilar

Thisisan

sides. by visual comparison of

Generally, together lies mon to both channels this

section is covered earlier.

It

is also possible

other

high level

this is

supply checked, nels in

One

must changed between

upafaulty

dently necessary to determine whether

(the inputissatisfactory while is inputs,orin

front panel wiring which includes the tone control sections,

or

former which connects to front channels. change

faultison the However, a fault

and but

trouble is in

switch

through preamplifier sectionsina parallel parison visually of wiring thereisany

appearance

fully. see if one is

Hum

noise, SCA-35orassociated equipment. checked alone, with all disconnected, SCA

other what

equipmenttoreduce from chassis to chassis ful. Reversing line plugs on associated helpful. when associated is

true

wiring which connects to

as

the

Channel

If

tubesinone

be checkedasdescribed above.

the

If

itisnotatube

PC-ll)

in

the

PC-ll

If

no

inputs

in

the

panel

the

Z-565

this should be triedasa

If

both

only

orinthe

the

Each

section of

The

and

If

the

secured in place.Ifthe

equipment,

kind

It

not

a problem of

Not

Working

neither

preamplifier section.

faulty tube has been located.

mustbecarefully

It

output

channels workonradioorother

one works

12AX7's on

Noise

unit

first

mustbeunderstood

channel

mistake

unlikely situation,

the

cause of

in

the

input,

for

both

this is

PC-lO

one of these.Itis also possibletointerchange

and

of ground connections

the

Not

Working

channeldonot

the

tube.Ifthis cures

or

the

section which

the

wiring associated with

function,

section

is possible to re-do

two PC-lO

transformerstotrytoisolate

in

the

either

front

front panel controls.

difference between these sections.

the

in wiring.

at

fault.

is working,

step

and

with

thenitwill be necessary to determine

equipment

the

function,

has

been made in

the

wiring with

malfunction

one section of

the

power supply.

that

the

but

not

channels

only

element

two sides to see if

which causes

amplifier section

phono

then

or

that

compared

boardstodetermine

output

on

phono or tapehead

the

PC-ll

panel

and

selector switch should be identical

These

the

PC-ll

but

is to see whether

other

equipment

the

cover

the

hum. Sometimes connecting wires

are

good, sometimes

is disconnectedorturned

SCA-35.

thereisthe

the

butitshould be checked

the

of

the

unit

is working on

on phonoortape

together, then

the

PC-ll common to both chan-

light,

the

Tubes

substitution

the

bad

channel,

the

trouble,

itisin

handles the

in

channel.

transformer is most unlikely,

last

wiring from selector switch

The

parts

there

hum is reduced

that

the

(the

is not,

phono

the

difficulty is

the

Z-565

The

on bothleft

the

wiring

resort.

boardorin

PC-ll

arrangement,

should

should be compared careshould be interchanged to

is excessive

the

The

SCA-35 should be

except

and

bottom

are

necessary between

equipment

hum

which disappears

possibility

wiring to both

diagrams.

both

channels

whichiscom-

The

checking of

the

board should be

heater

can

be inter-

then

thenitis

preamp

PC-lO).Ifradio

then

the

and

tapehead

selector switch.

either

output

wiring of the

and

whether

the

high level

input,

then

the

board has

indicate

trouble is in

the

speakers

plateonthe

without

they

are

radio head.

circuits

section

trouble

to inter-

trouble.

selector

so com-

whether

hum

may

power

shows

evi-

in the

trans-

right

the

input,

the

both

the

harm-

be

off,

Hum

which persists

as

a source of troubleisgenerally a

or

wiring showninthe

particularly transformer, since these wires may

If

appear with

or

to be associated with

If

or

tapehead itismost the checked

An defective resistor with 7199

the

of

affected. turned circuit.

Some speaker negligible some noise will always be audible, masked minimum, noise with a millivolts across mum,

Sometimes, former

audible

placing a' small wedge of fibreboard

transformer, betweenitand

Distorflon

If

make sure nected

speaker taneously, cartridge is if a overloading of

If

itisin

if

in

circuitry supply

the

If

described previously lem

or

cause of it. should identical.

Voltage

The be of considerable vacuum Voltages with this chart. Deviations

abnormality,

tioning of helptolocate defective

a faulty tube. Wires which

diagrams,

true

for

the

be a source of hum. a

tube

causes

in both

the

volume control

inputs

likely to be associated with

channel which shows

by

substitutinginthe

objectionable level of hiss is

the

volume

circuit

distortion is encountered,

tape the

6BQ5 tubes.

only

and

-itcan

resistor (using insu]ated pliers) to see if

If

it

up,

then

hum

efficiency

at

normal listening levels.

by

the

it

should

may

cause some vibration of

as

a buzzing sound.

that

and

properly

have

frayed cables

this

inserted

amp

trouble seems to beinthe

one channelorboth.Ifin both channels,

common to

and

the95ohm

one

tubes should be

Inspectionofpartsonthe

be

made

Measurements

voltage

tube

voltmeterorsimilar

through

but

the

channels

with

onaprinted

turned

is on

phonoortapehead

the

same possibility

and

hiss will always exist -

and

loud sound.

the

not

exceed 40 millivoltsatthis point.

the

magnetic field

all

inputs

can

be a source of distortion.Ifa ceramic

goesinthe

the

input

channel

to see if both sides of

chart

shown with

aid

the

past

circuitatthat

after

other

equipment

resultofeither

are

may

be a

cause

wires which lead from

carry

problem, thenitis simultaneously.Ifthe turned

.down,

the

7199 tube.Ifit

the

volume

the

down,itis likely to be

often be located by wiggling

other

factors. However,itshould be

With

shorted

16 ohm

functioning.Ifthe

into

both

should be used to localize

circuit

output;

This

the

and

the

magnetic

tapehead

and

severe distortion.

channels is

resistor in

has

distortion, tests similar to those

interchangedtosee if they

in troubleshooting if

should up

this

range

point.

parts,

miswiring,orbad

thenitis most likely

turnedupa bit,

hum.

These

other

channel.

most

circuit

input

cover.

touch

board.Ifitisheard

appliestothe

At

but

of course this will be

the

should be less

with volumeatmaxi-

around

can or

the

first thing to do is to

outputs

several screws simul-

input)

SCA-35,

the

printed

the

schematic diagram will

test

instrument

be compared carefully

to 20%

they

Such

is eliminated

not

positioned

of hum.

AC

currents

not

occursonphono

the

12AX7 tube for

tubes

likely caused by a

input,

the

woodontop of

cartridge

indicate a malfunc

with volume

depending

very

volume control

the

PA-774 trans-

cover which is

be e]iminated by

are

properly con-

leads to a loud-

there will be

then

thatofthe

cathode circuits of

circuit boards

the

are

not

measurements

faulty

This

the

PA-7

which

likely to

hum

is loud

can

part

of the

the

hiss is

12AX7

high

levels,

than

input

determine

the

power

the

circuit

there

available.

signs 0

tubes.

as

then

be

body

on

th

(or

only

probare

are

is

can

.

at

2

a

18

-

1.2 megohms

R 1

R 2

150,000 ohms 1 watt 5%

R 3

5,600 ohms 5%

120

_i

120

1.2

R 7

47,000

R 8

390 ohms

R 9

18,000 ohms 5%

R10

100,000 ohms 5%

R

11

47,000 ohms

R 12

1.5

1.2

R13

R14

150,000 ohms 1 watt

R15

5,600 ohms 5%

R16

120

R17

120 ohms 1 watt 5%

ohms ohms

1 watt 5%

megohms

ohms

megohms megohms

ohms

1 watt 5%

5%

R

18

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R

23 R24 R25 R26 R27

R

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R29

R30

R

31 R32

R33

R34

megohms 47,000 ohms 390 ohms 18,000 ohms 5% 100,000

4~000

1.:>

megohms 10,000 ohms

10,000 ohms

18,000 ohms

megohms

4.7

270.000 ohms 1 watt 560 ohms 5% 22,000 120,000 27,000 ohms 1 watt 5%

ohms

5%

1 watt

5%

All

resistors are

5%

Y2

watt, 10% unless otherwise noted.

R35 470.000 ohms C 9 330pfmica

R36 470,000 ohms C10 3.3

R

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R38 22.000 R39 2200 ohms 1 watt C13 3.3 R40 2200 ohms 1 watt C14 3.3

R

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R

42

C 1

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C 2 22 nf @400v. C19

C 3

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11

C12 10nf10%

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C16 22 nf 10% C17

C18 1 mfd

C20 1 mfd 400 v

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nf

10%

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nf

10%

nf

10%

22 nf 10% .lmfdI16V.

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250v.

mfd 400

pf @ 600v.5%

c 5 3.3 nf 10% C22 .02 mfd @ 500

C 6

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C 7

C 8

mfd @ 16 22nf@400v. .1

mfd @ 400

v.

C23

50/50

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FACTORY

The

SCA-35isdesignedtoprovide perfonnance assembled 120-volt

AC

and

power

for a long

ationsofseveral

no

pronounced

the

nonnal

if

it

is your suggested

guarantee

operated

local

poweristhis

thatavoltage

installedtoprotect

All

parts

usedinthe

of

one

year

from

carry

the

standard

ranty.

Defective

are

returned

the

dealer

guarantee

any

non-standard

standard

purchased

n

itisbelieved be

disconnectedbyunsoldering,

so

short

prepaidtothe

from

period

(resistors,

from a local

thatitcannotbere-used. Warranties on the trans-

formers are void

If

the

kit

has madetofunction a

short

periodofuse, chargeof$10.00, side

the

warrantyorhave

SERVICE

installed.Itis

suppliedtomost

volts

aboveorbelow

effect

upon

on

with

AC

the

amplifier.

the

dateofpurchase

electronic

parts

willbereplacedatno

whom

has

passed,

parts

capacitors,

thatatransfonner

if

the leads are

been

completely

properly, plus

the

AND

WARRANTY

reliable,

period

of time,

intended

when

for

homes.

this

figure will

performanceorcomponent

the

equipmentisnot inputs high

greater

or

than

higherinvoltage,itis

regulatingoradjusting

SCA-35

are

guaranteed

except

industry

factory

the

kit

DYNACO,

usedatnet

electronics

was

either

purchased.

prices.

tubes)

supply

(EIA)

directlyorvia

Inc.

Parts

can

store.

is defective,itshould

neverbycutting

cut

too sJwrt for re-use.

assembled,

orifdifficultyisapparent

we will service

costofthe

been

damaged

the

parts

kit

by

trouble-free

properly

use

with

Although

the varihave

life,

applicable

130 volts.

device

for a

period

tubes,

which

gO-day war-

chargeifthey

After

the

will

supply

which

are

generally

its

leads

yet

cannot

after

for a fixed

which

are

out-

the

user.

Factory

assembled

rantyonlaboraswellasparts.

Fixed-charge

for

kits

If

be

which

solder

other electrically The

serial

book

mustbementionedinall

case

where

the

factory

It

is

the

to

one

year

When service, and kit.

attachanote

addressofthe

The

are

than

modified

number

parts

for

service.

factory

from

shipping

kit

should abusesofhandlingintransit. protected removed. rounded packing

be

fierissuppliedissuitable are

Shipment possible; C.O.n. charges

be

METHOD

NOTBEUSED

The bility

withaplasticorwax

The

unit

by

several

material.

properly

used.

shouldbemadebyprepaid

repaired

for

freight

have

been

FOR

THE

FOR

DYNA

for

Company

damages

operationofthe

amplifiers

service

incompletely

rosin

without

on

and

core

the

includeaone-year

maintenance

wiredorkits

type,

prior

factory

front

coverofthis

correspondence

are

returned,

or

kits

prerogativetolimit

the

dateofpurchase.

the

amplifier

specifying

sender,

be

securely

to

the

and

the

packedtowithstand

The

front

paper

shouldbeplacedina

inches of

The

original

kits

and

prepaid).

SHIPMENTOFASSEMBLED

THIS

PURPOSE.

or

shredded

for

shippingifthe

will

then

service

PARCEL

assumes

injuries

cartoninwhich

be

charges

no

sustained

Dynakit.

war-

are

not

available

wired

with

or

kits

physically

authorization.

instruction

andinany

sentorbrought

the

service facility

DYNACO, symptoms,

serial

plate

covering,orit

rugged

number

should

carton

Inc.,

the

name

of

may

paperorother

the

ampli-

original

EXPRESS,

returned

(unless

POSTISNOTASAFE

KITS,

inserts

where

EXPRESS

these

AND

SHOULD

liabilityorresponsi-

in

assembly

or

to

for

the the

be

be sursoft

or

PARTS

Partsofsimilar as a matter

Reslsfors

1¥""50 ohms, 5 watts,

~

95 ohms, 5 watts,5%- R42

0. 2200 ohms (red-re<!-red), 1 watt, 20% - R39, R40

IV

10,000 ohms (brown-black-orange), 'hW, 10% - R25, R26

,jl-

18,000 ohms (brown-gray-orange).

J-

22,000 ohms (red·re<!-orange), lhW, 10% -

.%' 1.5 megohms (brown·green-green), %W, 10% - R12, R24

Capac/for.

~2

n!

(.02

'9-"10n!(.01

......

3.3

oJ...-'.02

YTwo-section

J...-

Four·section filter capacitor, 6Oj40nO @ 450V; 100 @ 25V - C24

Hardware

57

49

4

.

4

~

12 12

12 #8 Lockwashers

111':

i('

"f"

k'

..

'lY"Rubber

l'"

#I'

mid) mid)

n!

(.0033

mid

#4 #4 #4 #6 #6 #6

#8

%" Control mounting

%" Lockwashers

Ground lug Pilot

Pilot

Cable clamp

Rubber

mid)

500V disc - C22

filter capacitor,

Machine screws

Nuts

Lockwasbers

Machine screws Nuts Sheet

metsl

Machine screws Nuts

light jewel light jewel spring

grommet

feet

type which do not change performance may sometimes be included

of

expediency. This

10%

- R41

10% - C15, C16

10%-Cll,

10% - C5, CI0, C13, C14

screws

C12

50/50

nuts

will

account

'/2

W, 10% - R27, R28

R38

@ 450V - C23

LIST

for

slight

variations in va,lueorappearance.

CDnfrols

,y

V Volume

J,..

.v

IV

12""

fY

Y"SPST

.... Fuse holder with rubber washer

or' Fuse, 2 ampere, Slo·Blo

8"

.t'"

.:.Y

~

\l.o

~

'"

.....·4 socket

~

IY

..

~

""

_.L

~Irisulating

u,...

Y'Chassis

",",PA-774 power transformer

Q'

,z..--PC-I0 circuit

~

yOutput

e--

02"

• Large knob '8 Small

\l/

-r

.):-

Selector switch - 134601

control-177254 Balance control - 167754 Bass control - 167205 Treble oontrol - 167504 Hum

oontrol - 147102

DPDT

slide switch (six lugs)

slide switch (two lugs)

and

circular

PEC

tone control circuit module(7leads) - 555002

PEC

input

Silicon rectifier, 500 rna 1000 PIV Mounting wafers for filter capacitors Pilot Pilot AC outlet

4 screw terminal 5 lug terminal strip 9 pin tube socket Hookup wire(Ieach Flat

Line cord with plug

Z-565

PC-ll Driver tube 7199

Preamplliler tube 12AX7

Front Instruction manual with pictorial diagrams Warranty

circuit module(5leads) - 555003

light socket lamp

#47

input

socket

strip

4-conductor cable

sleeving (black) r

assembly(5pieces)

output

circuit

tube 6BQ5/EI.r84/7189 (matched)

kn.ob panel

card

red, green, black)

transformer board

assembly

board

assembly

jECC-83

nut

21

-

s

Dyna Dynakit SCA-35 Instructions For Assembly And Operation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SPECIFICATIONS