DYNACO Dynakit ST35 Instructions For Assembly And Operation Manual

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STEREO

35

POWER

AMPLIFIER

SERIAL

This

number tioned concerning

in all

NUMBER

must

be

men-

communications

this

equipment.

INSTRUCTIONS

ASSEMBLY

OPERATION

FOR

PATENTED

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3060

JeHersan

Price $1.00

929014

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St.,

Phila"~I~hia,

,

Pa.

19121

U.S.A.

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CONTENTS

3

Frequency

Intermodulatlon

Minimum

Power

Hum

Input

Output

Damping Channel Power

Tube

Shipping

General Mechanical Wiring 240·Yolt Installation In

CaseofTrouble

Parts

list

Schematic

SPECIFICATIONS

Power

Output:

Response: Response:

Distortion:

and

Noise:

Sensitivity:

Impedance: Impedance:

factor:

Separation:

Consumption:

Complement:

weight:

Wiring

Practice

• •

Assembly;

•...••..

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I

....:..".. . •

:.

•.

Instructions 6

Transformers

" .

..

. . . . . . . . . . . . ...10

"..

Diagram

35

IHF

± 1

20

exceeding 1%

1 dbof17.5

Less

channel. Less

watts

Music

db

from10cps

cps to

than

Back

Cover

continuous, 45

Power

(both to

20,000

cps

without

distortion

watts

each

1%

at

17.5

watts

than

0.1

40,000

channel

%

average listening levels.

Size:

Inaudible; rated

1 volt

put

500,000

8

and

10

from20cps to

80 db.

100 watts,

7247

silicon diodes

4// high, 13" wide, SW' deep.

more

output.

input

for

(each

channel).

ohms.

16 ohms.

50/60

(2),

6BQS/EL84/7189

than

17.5

-'

20,000

cycle a.c.

(2).

80 db below

watts

16 lbs.

4 5

9 9

11

watts

channels)

cps.

within

each

at

out-

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2

"

INSTRUCTIONS

THE

DESCRIPTION

The

Stereo simple conventional

configuration power degree of technical refinement, tive use of typical cost.

17.5-watt amplifier. rating,

at

"music amplifier, full power is audio Stereo

minimum 35 can, if amplifiers

output to

are

amplifier

Eachofthe

the

any

spectrum,

35,

its rating, is

upontodo

The

heartofthe

this extended cycles), designed quency previously power

loudspeaker

tortion

amplifier direct

dition abletomaintain

rating.

The

transformer

supplied

usedina

The

coupling

is unique; its

of

for

adjustmentorbalancing.

fier is

augmented

to

cathode.

Two

the

other

to

provide20dbofnegative

35isa

appearance

design is

representing

premium-grade

Dynakit

two

power frequency power"

although

available

even

abletohandle

detriment

necessary,

with

so,

transformer,apatented circuit.

frequency response

andiswoundbyspecial

core to

spectrum.

been

load

as a

circuit

and

high

output

negative

stageispreceded

and

cathodyne

operationisindependent

the

tube.

purely

dual

and

circuitry.

an

extremely

engineering

design offering

channels

Although

statedisavailableona continuous basis

from 20 to 20,000 cycles

rating

would

even

this at

Nor

would

when

driven

these

to

the

duplicate

much

higher

Stereo

The

insure Transformersofthis

usedinlow-cost

providesanoptimum

and

matched

configuration

stabilityoftheir

between

The

its

by a feedback

feedback loops,

capacitive,

35 is

transformerisfree of resonances,

low

the

output

phase

sections).

phase

capabilities

DYNAKIT

power

amplifierofdeceptively

Behind

sophisticated

the

most

recent

and

construction.

combined

components,

superb

in the

not

make rating

low

distortion

sucharating

to power

overloads

sound. As a result,

power

the

design

(from

distortion

group

which gives low

inverter(a7247

inverter

permanently

Gain

are

carried

feedback.

with

has

performanceatlow

Stereo35is

evident

the

techniques

equipment

tubes used.

d.c.

by a

The

in this

connection

one

from this

per

Stereo35a 45-watt

would

not

throughout

indicate

output

gracefully,

sound

ratings

special

tailored

6 to over 60.000

over a wide fre-

caliber

match

with

the

operating

composite

phase

of the

stageistherefore

partofthe

mostly

over

This

FOR

STEREO

its

seemingly

circuit

advances

This

high

the

conserva-

resulted

disclose

levels

intensity

when

Dynaco

on a

of

between

These kit, inherent

inverter

ageorcon-

withnoneed

from

resistive the

provides

in a

ratedasa

simple

second. A

that

beyond

with

the

Stereo

called

2-565

specifically

carefully

have

never

moderate

tubes

and

point.

voltage

tube

with used

ampli-

cathode

amplifier

ASSEMBLY

35

distortion benefits. all load for use with

in

the the

of

has

the

are

dis-

and

low

The been conditions the provides shift meet

builder,asit much boards characteristics. full

servatively

pletely prevents effectively.

One Stereo ductionoftransient for waves are

non-sinusoidalincharacter.Itis this type

upontoreproduce. ments cuits, operating approachisparticularly source

bourines,

these

whichisonly

frequency

In

from are low-efficiency signal

thing effortlessly

It

which

with

provideaperceptible

ness of 35, cost.

AND

USE

OF

POWER AMPLIFIER

and

noise. a

The

feedback loopisunconditionally

arrangements,

any

loudspeaker,

valuesofcomponents

carefullv

optimum

and

its specifications.

electronic

advantage

sealed

of

35 is

amplifiers

as

actually

of waveform which

help to

and

material

sounds

addition,

overload,

not

might

except

is

distinguishes

superficially

andithas

determined

f~r

each range.

additional

will

remain

gives

equipmentissubject.

give

additional

assuring of

rated

in a special

core

vibration

the

outstanding

the

attention

refer

the

signal

composedofnon-repetitive

evaluate

these

parameters

includes

piano,

withatransparency

obtained

response,

the

so

affectedbythe

speaker

overload

the

reproduced.

this

characteristic

sound;

this was

been

high

so

that

selected

to be

stage'

have

The

use of close

assurance

accurate

Thisisvery

immunity

stability

a level of

the

capabilitiesofthe

power

have

cymbals,

transformer.

encapsulating

and

also serves to

aspects

which

signals.

Pulse

Stereo

that

highest

similar

Specifications

only

to

performance

content;

the

amplifier will

tests

the

transient

been

applied

for

the

Stereo

evidentinlistening

percussive

etc.

·when

without

35 recovers

the

overload

systems,

the

amplifier, peakofthe

subtlety

the

Stereo

specifications.

improvementinclarity

the

design

achieved

damping

including

been

that

so

from

has

however.

and

The

an

bounce, Rutterorovershoot. tones

where

in a

factor.

the

Stereo

electrostatic

for the

certain

setatthe

these

that

every

important

the

variations Heavy-duty

and

performance

after

of the design of

been

irregular,ortransient

square

performance

to derive

35.

The

sounds-drums,

Stereo

and

absenceofblurring

amplifier

almost

immediately

signals.

an

reproduction

heaviest

of design

35 from

objective of the Stel'f'o

unitofremarkably

and

stable

35 is

Stereo

that

the

operating

center

tolerance

settings

amplifier will

to the kit

to which

reproducibility

which

dl:'sign.

paidtothe commonly

music

sounds

usuallybecalled

Thus,

other

These

The testing,iscommaterial

dissipate

with

pure

and

which

wave

measure-

the

success of this

tests

where

35

reproduces

has

extended

immediatply

following

even

occasional

of every-

passage

approach

equipment

differences

and

further

under

suitable

types.

35 have

parts

will

not

circuit

takes

con-

which

heat

the

repro-

quoted

sine-

spl:'ech

are

of cir-

corr('ct

the

tam-

with

peak

natural-

low

of

is

3

GENERAL

WIRING

PRACTICE

Assemblyofthe

Stereo comparedtothatofother plied

with

all

components arranged makes 35

When the by diagrams

Hav(~

your

to GO-watt

a

screwdriver.Ifyou

with

becauseofits not considerably;

The which quite solder

on

the

chassisinan

wiring

quick

and

should

takenomore

you

parts

list

matching

unpack

first.

them

the

You

to

supplied,

the

kit.

proper

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toolsathand

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needapencil-type

rating;along-nosed

haveasoldering

carp.

especially

higher

when

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essential.itwire-cutting

these

are

only

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requir('sabitoftechniqueissoldering.

easytomaster.

There

cOlUlection:

1.

Makeagood

2.

Heat

3.

Apply

both

soldertothe

mechanical

partsofthe

runs.

4.

Allow

the

connectiontocool

35 is

kits.

mounted,

easy.

than

kit,

can

identify

parts

working

necessary

avaibble

involved

are

exceptionally

The

circuit

and

the

open,

uncluttered

The

constructionofthe

a few

hours.

check

the

components

unfamiliar

illustrated

before

beginningtobuild

soldering

pliers;

diagonal gun,itshould on

the

heat

and

stripping

for less

in

building

four

stepstomaking

connection.

connection

untilitmelts

undisturbed.

simple

boards

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way

StNeo

against

components

in

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pictorial

iron

cutters;

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circuit

output.

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tool will

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a

Dynakit

and

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with

the

iron.

when

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parts

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of

30-

and

board.

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Oneofthe is to crimp amountofbare

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is

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bendasmall

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onto

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wire

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is too long,

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terminal

around

makesaconnection

error

endofthe

to

end

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or

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has

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WRONG

connection

wire.

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connect('d.

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is dane:crofthe

chassis.

terminal

There

mon' thatismuch made.

then

to

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is

than

mon:

ALL

SOLDERING

CORE

core

useisplainly hand

50/50or60/40

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solder

SOLDER.

isnowarranty

has

marked

of

doubtful

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origin,

rosin

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tion. are nection terminals

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by

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point

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number

endofa

each

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of

The

used,

of

wire

case,

first

roll

supplied

insulation

leadsoncomponents

the

length

tobemade

or

components.

as

closelyaspossible.

thatuninsulated

through

are

connectedtothe

uninsulated

touch

your

work

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and

go

ontothe

often;ifyou

should

the

steps

......

from

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should

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work

MUST

used.

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core

symbol

further

BE

on

any

equipment

Make

sure

Core".Ifyou it is wise to solder.

is to be

soldered,

(S).

connections

DONE

that

obtainanew

If

this

must

soldering.

in

the

instructions

with

the

lengthofthe

cutapieceofwiretothe

with

the

kit.

and

then

each

end

before

making

chosen from

pointtopoint

being

The

should

lead

that

be

which

without

"dress",

wiringisarrangedasit

follow

wires

do

that

showninthe

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not

touch

must

vibrationorsagging.

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wires

and

the

chassisorbottom

after

each

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correctly

check

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component

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work

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plate

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when

mark

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methodically.

wiringiscomplete.

WITH

have

in

the

ROSIN

which solder

solder

acid

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on

roll of

the

instructions

symbol

begin,

wire correct

remove

be

made

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specified.

the

connec-

is

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length

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trimmedasthey

permits

goes from

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a con-

strain

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on

the

one

pictorial

be

exercised

each

other,

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unless,ofcourse,

impor-

leads

or

ter-

accidentally.

you

are

sat-

the

space

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the

pictorial

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To

transfer

the

tip

of

the solder.Ifthisisproperly used,

the

tinning

a

clothorsponge

to

correctly nection

tinned,

almost directlytothe illustration

soonasthe

to

The

circuit components and

solden~d

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other

sections wirestoeyelets numbered To

solderawiretothem.

of

the

for

iron,

solderinthe

like

the

illustration3tthe

transition

from

heat

from t.he

iron

should

iron

be

clone

to

kept

the

maybemainl1.inedbywiping

ev('ry

few

minutes

the

tip

will

heatboth

immediately.

pal'ts

to be

above,

solder

hoards

and

flows freely.

of (resistors in

place.

of

on

identification,

and

the

endofthe

eyelet

flows. A

eyelet

the

Solder

soldered,asshowninthe

both

iron

the

and The the

StNeo

ampli

boards.

they

35

capacitors)

circuit

fier

These

are

filled

are

win~

correctly

right.

above,

to wire.

the

wire

and

terminal.

brightly

fIrst

while

should

tinned

time

the

soldering.

parts

of

then

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iron

tip

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middle

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solder

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boards

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with

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connection

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showsasmooth

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with

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as

all

to

are

tip

4

LEFT

3-SCREW

TERMINAL

STRIP

MECHANICAL

GROMMET

ASSEMBLY

FUSE HOLDER

RIGHT

3-SCREW

TERMINAL

STRIP

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r

V-2

6BQ5@

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CHECK

BEFORE

I ( )

2( )

3( )

4( )

5()Mount

6( )

AND

Mount side of

#4

screws, supplied). orientationofthe

Mount

place with ber washer goes on maintaining outside, with ring with mounted

fuse

holder

in

the

should be

holderatthe Mount

chassis,asshown in

lockwasher Install and

V-6 011 top of the two PC-13

that

the pictorial for each socket. of

#4

lar

cutoutsateach boards Before hardware,

boards will be Install chassis, using two each socket. should

<6

GD

Z-565

OUTPUT

TRANSFORMER

(LEFT)

GD

I

®

CIRCUIT

LEFT

PICTORIAL

the two 3-screw

the

the fuse

diagram. After mounting,

the 5-lug terminal

the

sockets

hardware.

the two

are

mounting

the

be closest to the

BOARD

INPUT

SOCKET

AFTER

chassis in

nuts

and

The

pictorial

holderinits

the

circular

pressure

one

the

other

securely

terminals

bent

away

angle

and

nut.

four sockets

are

diagram

Mount

Do

PC-13

mounted

study

properly

two

input

The

(LEFT)

DIAGRAMS

DOING

terminal

the

cutouts

lockwashers

diagram

terminal

hand, while

without

not

#2

endofthe

each

the

sets

long

strips.

brass

threaded

the

outsideofthe

against

hand,

shown in

the

not

from

the fuse

the

tools.

are

oriented

from the body of

strip

diagram,

supplied

all

installedinthe

shows

each

over-tighten.

circuit

the

board

diagram

orientedonthe

sockets from

of

#4

(center)

circuit

EACH

the

boards in the rectangu-

e

0

Pictorial

strips

(the

shows

cutout,

tightening

fuse

Be

exactlyasshown

the

pictorial diagram.

on

usinga#4

for V-2, V-3, V-5

circuit

correct

socket

chassis;

inside of the chassis.

with four

to be

hardware

lug of

board.

Diagram

# 1

AND

STEP.

on

the

provided, using

smallest

the

correct

fasteningitin

ring_

The

chassis; by

holder

terminal

the

from

the

holder

sure

with

sure

can

that

lug B

the

side of

screw,

boards.

same

orientation

two

note

that

sets

of :it4

that

chassis.

insideofthe

to

mount

each

socket

brass

Note way;

PA-774 POWER

TRANSFORMER

# 1: Top

#3

out-

size

rub-

the

be

the

fuse

the

viewofchassis.

7( )

8(

9(

IO(

sets

the

H(

'2)

OUTPUT

TRANSFORMER

(RIGHT)

9

CIRCUIT

Mount First, at oriented

the four

and

turn

against

)

Pass

(marked the chassis. through as loosely with four

(the tion so

possible,

)

Pass

(Z-565)

chassis, yellow leadsgothrough of four circuit Pass

)

through

chassis. A

nearest the four screws former so output

Insert

through

·Seven States. elusionofthese

the

filter

look

at

the

base of

then

with a pliers while holding

the

shown in

largest

thatitis

the

again

the

chassis.

setsof#8

boardaspossible,

the

to the fuse holder,

othel- hole.

sets

immediately. transformers.

the

leadsin2,10-

Special

each

as shown in

mounting

twist each of th moun ting lugs

chassis with

leads of

Z-565)

The hole closest to the

the

size

tighten

leads of the

through

observing

Mount

hardware, positionitas

leads of the power

the

two holes providedatthe

group

Mount

of

#8 thatitis evenly rubber

which the line

....

olt

instructions

instructions.

e

@

Z-565

V-5

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BOARD

(RIGHT)

RIGHT

INPUT

SOCKET

capacitorinthe

symbols

connecting

lugs of the

one through orange, black

diagram. #8

supplied).

as

the screws.

the

of four leadsgothrough the hole

hardware,

First,

Then,

grommetinthe

transformer

stamped

the

pictorial diagram.

your

of the

the two holes

Mount

screws,

After

close to the

other

two holes

that

the hole closest to the

the

transformer

and

the

power

but center spaced tighten

cord

PB-028.

[01'

in::ilaliinJ!

cutout

lug; these must be

capacitor

the

capacitor

other

hand.

output and

center

nuts

and

adjusting

circuit

output

provided

the black, orange

tighten

transformer

five':'

transformer

do

the power trans-

between the two

hole in

is to pass.

for

PU·U28

provided.

in the plastic

in the slots one-quarter

transformers

provided

yellow leads

of the chassis,

the transformer

lockwashers

its posi-

board

transformer

loosely with

close to

the

screws.

(PA-774)

centerofthe

leads throllgh

not

tighten

the screws.

the

lI~C

outside

bel!inatthe

Insert

snugly

in the

and

center

with

chassis

the

Unilt'd

in

go

as

the

('on·

5

)

,n

When

strip

about

it

with

onto

permits a

ure

end from

the lug remember, a connection is

the

2(

)

Cut to termmal

(.)Twist

3

Connect' one of them. to lug # 1 of

strip. .

4( ) Connect

'#2

5(

)

Cut

'. 3lJ2"

lug A of

6(

The

nected leads to

.

in

the

.7(,)

Connect

ofV-3.

~:.'

'.

are

"

all'connections'tothem stripped

in

the

diately'

time tobecertain

ware

ends,

8(

Cut

transformer leads to connect the brown-and-white lead to on the

9(

Connect the. qrown power transformer lead to

#4

lOr )

The

next. Carefully

WI.!UNG INSTRUCTIONS'. '

cutting

the

insulationatthe

114"

the

it; this

more

the

length with a ruler, from

of the

and

black leads to 11/

#4

of· the 5-lug

symbol

.~other

~ether

the

of

the

'red:ahd-yellow power transformer

in

length,

the

four

remaining

next.

6"

diagram.

#5

of V-3 on

the

IMP"ORTANT:'

smill(

wire

lugs 'up to

after

cannot

the brown

RIGHT

of V-6.

LEFT

transformer

leadstocorrect

endofeach

of wire.

soldering

wiI1

Tin

the exposed end,byheating

iron

and

melting a

keep

the

end

secure mechanical connection. Meas-

lead..while holding

the

perpendiculartothe"

"

in length,

2

terminal

(S)isprinted

,black

lead

Bof

the

fuse holder

the

two red power

other

red power

5-lug terminal

and

connectitto chassis-mounqng

strip.

only

to be soldered when

after to 3lJ2",

transformer

str~p.

filter capacitor. '

power transformer leads

Cut

the

green

and

each.

and

twist

them

Connect

the

green power

the

green-and-white lead to

LEFT

circuit board .

transformer

Because

'a~d

closely spaced;' it', is imperative

be

made

endsasshort

the

insulation;

soldering each connection; check

that

accidenta.Jly be

and

circuit

I

output

transformer leads

cut

the blue-and-white.

as possible;'

nearby

touched.bybare

the

brown-and-white power

6".

Twist

board.

length,

leadtoexpose

bitofsolder

from fraying,

the

chassis to

lead

straight

chassis.

the

Cut

and

connectitto

Do

not

instruction.

and

one

solder;

connect

(S).

transformer

the

5-lug terminal

leads

lead to lug

lead

are

green-and-white

together,asshown

leadtopin

the

tube

~ocket

with care.

cut

off excess imme--

terminals

them

together,

are

Keep

insert

and

hard-

#5

of V-6

connected

and

green-

them

and

the

out

of

to

con-

#4

lugs

that

each

wire

and

it

.

..

•

':.

-:l'

.and-white leads from

to

exactly2"in

-'

'twist

the'

leads

the

blue-and-white lead to

LEFT

11

( Connect

(S)

12( )

Twist

LEFT

13( Connect the green lead to

14(

Connect

.

together

output

#7

circuit

the

of V-3 on

the former to lug lug

nexttothe

in

the

side of

shown

the

LEFT

length.

together,

'Strip

as"inthe

and

boa~d

(S).

green-and-white lead to

the

blue

and

green leads from

transformer. Connect the

the

LEFT

red

lead (rom the

#2

of the filter capacitor.

square symbol

capacitor,

and

circuit'board

# 9 of V-3.

on

should

pictorial diagram,

LEFT

CIRCUIT

LEFT3-SCREW

output

tin

BOARD

transformer

the

ends,

diagrain; Connect

#7

oc'

V

-2

on the

#9

bll;le

lead tq

(S),

LEFT

output

Thisisthe.

the

plastic

be in the position

TERMINAL

and

of V-2

the

trans-

under-

51

Ci

6

,

/

DYNACO Dynakit ST35 Instructions For Assembly And Operation Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SPECIFICATIONS