DYNACO Stereo 70 Instrucciones de montaje

SERIAL

NUMBER

6701028

This

number must be

men-

tioned

all

communica-

tions concerning Dynakit.

INPUT

DYNAKIT

STEREO

LEFT

RIGHT

MONO

~mQ

TfREO

•

PAT.

NOS. 2815407

and

2815408

BLASE.

RIGHT

v...

PREAMP

POWER

()'rNA

COMPANY

P""ILA-,.

MAor

S A

('ltCUII_Y

"AnNlEP

Price $1.00

Power

Output

Frequency

Response

Power

Response

Inte

rmodulation

Distortion

Hum

and

Noise

Sensitivity

Output

Impedances

Damping

Factor

Minimum

Channel

Separation

Power

Consumption

Preamp

Provision

Tube

Complement

Size

Weight

Finish

SPECIFICATIONS

watts

continuous,

watts

peak

each

channel

±.5 db

from

cps

20 kc within 1db of 35

watts

less

than

distortion

Less

than

watts

(normally

about

.5%).

Less

than

.05%

1watt

Inaudible;

better

than

90 db

below

rated

power

1.3

volts

rms

input

for

watts

out

4, 8, 16

ohms

each

channel

55 db

190

watts

50/60

cps

Two

power

takeoffs

with

independent

heater

windings

eliminate

interaction.

Each

6.3

volts

amp,

350

volts

dc 10 mao

Dynakit

pre-

amplifiers

plug

directly

without

modification.

EL-34

(4), 7199 (2),

GZ-34/5AR4,

selenium

rectifier.

13"

9-1/2"

6-1/2"

high

pounds

Chassis

and

bottom

plate

bright

nickel

plated.

Cover

finished

charcoal

brown

vinyl

paint.

-l:!

'70

70~~

INSTRUCTIONS

FOR

ASSEMBLING

THE

DYNAKIT

STEREO

DESCRIPTION

Your

Dynakit

stereo

complete

dual

watt

power

amplifier

kit

which

offers

the

highest

possible

fidelity,

low

cost

and

in a

compact

arrangement.

uses

patented

circuit

out-

standing

performance

characteristics,

along

with

top

quality

parts,

including

the

new Dynaco

Super-

Fidelity

A-470

transformers

--the

finest

available.

The

measured

specifications

show

that

the

stereo

amplifier

unequalled

performance,

and

its

lis

ten

quality

also

unrivalled

any

regardless

price.

This

amplifier

has

characteristics

and

power

rating

ideal

for

either

stereophonic

monophonic

use.

The

two

non-interacting

watt

channels

provide

adequate

power,

stereophonic

two

channel

system,

for

loudspeakers

any

level

efficiency.

The

channels

can

paralleled

for

full

watts

low

distortion

output,

suitable

for

practically

any

monophonic

use

even

where

several

loudspeakers

are

use

different

areas.

The

high

power

capability

and

low

internal

imped-

ance

provide

excellent

damping

for

all

types

high

quality

speaker

systems

without

need

make

adjustments

match

specific

speaker

installations.

The

design

features

your

Dynakit

which

con-

tribute

its

superior

listening

quality

include

some

which

are

not

revealed

the

customary

steady-

state

laboratory

measurements.

For

example,

the

stereo

does

not

exhibit

bounce

and

flutter

when

pulsed

with a

transient

signal.

Thus

sharp

per-

cussive

signal

drum

beat

piano

note

will

reproduced

with

sharpness

and

clarity

and

neit~er

overhang

nor

muddiness.

The

Stereo

70,

unhke

many

other

amplifier

circuits,

has

been

designed

provide

its

specified

performance

on a

loudspeaker

load,

not

just

under

laboratory

measuring

condi-

tions.

Therefore,

the

connection

of a

loudspeaker

the

amplifier

does

not

deteriorate

its

perform-

ance

listening

quality.

addition,

due

the

high

quality

the

output

transformers

used,

the

Dynakit's

power

handling

capabilities

are

maintain-

over

the

entire

audio

band

without

the

sharp

rise

distortion

which

characterizes

most

amplifiers

the

extremes

high

and

low

frequencies.

The

Stereo

uses

circuit

arrangement

based

that

the

Dynakits

Mark

and

Mark

III which

has

become

world

famous

one

superior

qual-

ity while

essentially

simple

and

trouble

-free.

The

new

7199

tube

used as

pentode

high

gain

voltage

amplifier

directly

coupled

cathodyne

phase

inverter.

All

parameters

are

adjusted

for

minimum

distortion.

This

type of

phase

inverter

has

the

unique

advantage

that

its

operation

independent

of tube

aging

that

adjustments

are

required

maintaining

optimum

performance.

internal

capacitive

feedback

loop

balances

the

phase

inverter

the

highest

frequencies,

and

the

a r

ran

gem

e n t

provides

accurately

balanced

driving

signals

the

output

tubes.

These

tubes

are

type

EL-34's

(one

pair

for

each

channel)

oper-

ating

well

below

their

maximum

ratings.

The

out-

put

tubes

use

fixed

bias

arrangement

which

set

through

use

Dyna

Biaset

(pat pending) which

provides

optimum

linearity

the

tubes

and

mini-

mizes

the

effects

unbalanced

components.

The

connection

the

output

tubes

includes

small

percentage

screen

which

improves

the

regulation

the

output

stage

and

makes

corr--

paratively

uncritical

load

impedance.

The

imp

dan

c e

match

and

bias

conditions

utilized

the

output

stage

provide

minimum

dis-

tortion

over

very

wide

dynamic

range.

addi-

tion,

20 db of

negative

voltage

feedback

lowers

the

distortion

unmeasurable

proportion

normal

listening

levels

and

less

than

intermodulation

distortion

watts

output

each

channel.

The

use

of a

minimum

number

phase-

shifting

stages

along

with

car

e f u I

transformer

design

makes

practical

have

unconditional

stability

both high

and

low

frequencies.

This

feature

the

design

means

that

there

tend-

ency

toward

motorboating

oscillation

under

any

condition

use.

The

inherent

lin

e a

the

circuit,

the

complete

stability,

and

the

prefabrication

all

critical

wiring

the

printed

circuit

assembly

make

construction

completely

non-critical.

The

use

conservatively

per

ate

highest

quality

components

insures

superior

and

pendab

I e

operation

over

along

period

time.

GENERAL

WIRING

PRACTICE

Assembly

the

Dynakit

stereo

quite

simple

compared

general

kit

assembly

require-

ments.

This

true

because

all

critical

parts

the

Dynakit

are

factory

assembled

for

you on

the

printed

circuit

assembly.

Other

parts

are

put

out

the

open

through

free

and

uncluttered

layout

there

easy

accessibility

for

wiring

trouble

shooting

purposes.

Construction

your

Dynakit

should

not

take

than

about

five

hours

because

these

simplifications.

Upon

opening

your

kit,

check

the

components

with

the

parts

list.

Familiarize

yourself

with

the

components;

they

can

identified

comparison

with

the

pictorial

diagram

and

specified

color

coding.

Proper

color

coding

will

mentioned

for

each

resistor

used.

Tools

r e

qui

e d

for

easy

assembly

your

Dynakit

are

soldering

iron

(small

tip)

soldering

gun, long

nose

pliers,

screwdriver,

and

wire

cutters.

Although

not

essential,

low

cost

wire

stripper

and

cutter

the

type

which

can

pur-

chased

for

less

than

$1.00

will

greatly

facilitate

cutting

and

stripping

the

various

leads

the

kit.

Good

soldering

technique

valuable

obtain-

ing

sat

i s f

act

results

from

any

electronic

equipment.

ALL

SOLDERING MUST

DONE

WITH ROSIN CORE SOLDER.

There

war-

ranty

any

equipment

in which

acid

core

solder

has

been

used.

Make

sure

that

the

solder

used

plainly

marked

"Rosin

Core."

you have

solder

on hand

the

origin

of which

doubtful

wise

obtain

new

50/50

60/40

sin

core

solder.

Whenever

sol

del'

required,

the

assembly

instructions

specify

it by

"(S)."

this

symbol

not shown

aiter

connection

specified,

indi-

cates

that

further

connections

will

made

that

point

before

soldering.

Soldering

accomplished

heating

the

joint

with

the

iron

until

solder

hot

enough

flow

when

touched

the

joint.

not

desirable

feed

the

solder

the

iron.

should

fed

the

junction

iron

and

joint.

After

the

solder

flows,

the

iron

should

held

place

for

afew

seconds

and

removed

when

seen

that

the

solder

has

contacted

both

parts

the

connection

the

lug

and

the

wire

which

connected.

should

not

show

ball

solder

but

smooth

transition

from

solder

component

lead.

Before

a p

ply

solder

the

joint

should

clean

and

the

lead

should

crimped

place

have

mechanical

security.

not

neces-

sary

wrap

leads

around

contacts

many

times.

single

turn

and

pinching

together

with long

nose

pliers

suitable.

After

soldering,

there

should

play

the

joint if

the

lead

wiggled with a

pair

plie

rs.

practical

all

soldering

with a

pencil

type

iron

low

wattage

rating.

small

tip

extremely

useful

when

working

in a

confined

space.

solder

ing gun

used,

should

used

with

discretion

since

the

amount

heat

available

far

than

qui

red

for

soldering

light

wires.

Component

leads

should

trimmed

they

are

used;

the

length

should

such

that

the

proper

connection

can

made

from

point

without

strain

lugs

components.

Care

should

exercised

not

allow

wires

touch

one

another

unless

they

are

actually

connected

the

same

point.

The

ins

Uc t

ion

swhich

have

been

arranged

for

simplified

procedure

in which

the

work

can

done without

interference

between

the

various

portions

the

wiring.

recommended

that

the

instructions

followed

on a

step

basis,

checking

off

each

stage

completed.

The

pictorial

diagrams

should

used

for

refer-

ence

and

all

connections

checked

against

these

before

going

the

stage.

the

wiring

done

methodically

and

each

step

checked

carefully,

your

amplifier

should

work

without

difficulty

soon

completed.

MECHANICAL ASSEMBLY

PICTORIAL

DIAGRAMS SHOULD

CONSULTED

DURING

ALL

PHASES

ASSEMBLY

1("I) Mount

the

seven

octal

sockets

with

4/40

hardware

(the

smallest

screws

supplied).

Note

that

there

small

slot

keyway

the

center

hole

each

socket;

sure

each

instance

that

this

keyway

properly

oriented

shown

the

pictorial

diagram.

Insert

screws

from

the

top of

the

chassis

and

mount

the

sockets

from

the

bottom.

Fasten

with

nuts

and

lockwashers.

Place

the

bakelite

insulator

over

the

front

the

two

socket

input

connector

and

mount

the

combination

from

the

inside

the

chassis

using

4/40

hardware.

(II)

Mount

the

SPDT

slide

switch

(with

three

lugs)

the

input

connector.

nuts

lockwashers

are

necessary

since

this

item

has

threaded

holes.

4(.;) Mount

the

two

four

screw

terminal

strips

the

has

sis

rear

from

the

outside.

Fasten

with

4/40

hardware.

5(v') Mount

the

two 10,000

ohm

potentiometers

the

3/8"

holes

near

the

center

the

chassis.

Locate

with

the

three

connecting

lugs

facing

the

front

th,:

chassis.

Put

3/8"

lockwasher

each

shaft,

insert

from

the

inside,

and

fasten

with a

3/8"

nut.

Fasten

the

long

4/40

screw

between

the

two

potentiometers

with a

4/40

nut.

Then

place

the

selenium

rectifier

over

the

screw.

The

lug

marked

(+)

should

closest

the

chassis

and

both

lugs

should

face

the

rear

the

chassis.

Fasten

with

4/40

lock-

washer

and

nut.

7(J) Mount

the

rubber

grommet

the

3/8"

hole

the

cente

the

rear

a n g e of

the

chassis.

(/).

Mount

the

fuse

post

the

shaped

hole

the

rear

the

chassis.

The

rubber

washer

goes

between

the

chassis

outside

and

the

shoulder

the

fuse

post.

ten

with

special

nut

provided.

9(L1

Mount

the

SPST

on-off

switch

(two

lugs)

the

chassis

rear.

The

con

nee

tin

lugs

should

located

shown in

the

pictorial

diagram.

lockwashers

nuts

are

necessary.

WIRING

PROCEDURE

EACH LENGTH

HOOKUP WIRE

SPECIFIED

SHOULD HAVE

APPROXIMATELY

1/4"

INSULATION

STRIPPED

FROM EACH END

UNLESS OTHERWISE SP

ECIFIED.

(---)

Mount

both

A-470

output

transformers

with

hardware.

Note

that

the

shorter

leads

come

through

the

holes

the

rear.

12 (-1 Us ing

4/40

hardware,

mount

the

seven

lug

terminal

strip

the

left

side

opposite

the

choke,

following

the

pos

ition

shown

the

pictorial

diagram.

()

Mount

the

choke,

C-354,

the

right

side

below

the

has

sis.

Put

the

screws

through

the

chassis

from

the

top

and

fasten

underneath

with

lockwashers

and

nuts.

The

leads

should

face

the

front

the

chassis.

(V[

Connect

the

red-black

transformer

lead

the

lower

(+)

lug

the

selenium

rectifier

(S)

2 (

Twist

the

pair

white

leads

and

dress

them

from

the

power

transformer

socket

VI.

Connect

one

lead

#2 of VI (S).

Connect

the

other

white

lead

#8 of

VI.

3('-)

Twist

the

red

pair

leads

and

dress

them

socket

VI.

Connect

one

red

lead

(S).

Connect

the

other

red

lead

(S).

(?1

Twist

the

pair

green

leads

together

and

dress

socket

V2.

Connect

one

green

lead

1/2

of V2.

Connect

the

other

green

lead

#7 of

V2.

('/1'

Twist

the

brown

pair

and

dress

them

socket

V7.

Connect

one

brown

lead

V7.

Connect

the

other

brown

lead

#7 of V7.

6 (

'1'

Dress

the

brown

-yellow

and

green

-yellow

leads

the

even

lug

terminal

strip.

Connect

the

brown

-yellow

lug #7

and

the

green-yellow

lug

#5.

(1.-1

Connect

the

red

-yellow

lead

the

solder

lug

near

the

filter

capacitor.

(-1

Feed

the

red

lead

from

the

left

0u t

put

transformer

through

both

cable

clamps

and

the

red

lead

from

the

right

output

trans-

former

through

the

right

clamp.

Connect

both

red

leads

filter

capacitor

lug

#1.

(The

lead

from

the

right

output

transformer

can

trimmed

the

required

length).

('/)

Feed

the

two

choke

leads

through

the

right

cable

clamp,

con

n e c t one

lead

filter

capacitor

lug

and

the

other

lead

lug

(These

leads

can

trimmed

re-

qUired).

Tighten

the

two

nuts

holding

the

cable

clamps.

10 (v')

Dress

the

power

transformer

black

leads

around

the

end

bell

and

connect

one

lead

lug

Aof

the

fuse

post

(S).

Connect

other

black

lead

lug

of on

-off

switch

(S).

('1

Connect

the

short

black

lead

from

the

right

output

transformer

lug #4 of

the

screw

terminal

strip.

Connect

the

brown

lead

lug

#3 (S).

Connect

the

orange

lead

lug

(S).

Connect

the

yellow

lead

lug

Mount

the

quadruple

section

filter

capacitor

the

special

cutout.

Fasten

twisting

each

mounting

tab

one

-quarter

turn.

Note

that

the

four

connecting

lugs

are

identified

markings

the

base

the

lugs.

sure

orient

the

capacitor

properly,

with

the

lugs

positioned

the

pictorial.

Mount

two

solder

lugs

with a

screw

and

nut

the

quad

filter

capacitor.

This

the

main

grounding

point

the

entire

amplifier

and

should

tightened

securely

with

the

two

lugs

pointing

shown

the

pictorial.

10 (...y-Mount

the

power

transformer,

PA-060,

the

large

center

cutout.

The

wires

should

face

the

front

the

chassis.

Fasten

the

two

mounting

screws

the

rear

with

lockwashers

and

nuts.

Place

cable

clamp

over

each

the

two

front

mounting

screws

and

fasten

loosely

with

118

lockwashers

and

nuts.

The

green,

red,

and

white

pairs

wires

should

threaded

through

the

left

cable

amp

should

the

green

-yellow

and

brown-yellow

ones.

Pass

the

brown

pair

through

the

right

clamp.

MOST

TRANSFORMER

LEADS ARE

PRE-CUT

THE

PROPER

LENGT

AND DO NOT

REQUIRE

CUTTING. HOWEVER,

THEY

CAN

SHORTENED WHERE DESIRED. IT IS

ESSEN-

TIAL

THAT

THEY

NOT

CUT

TOO

SHORT

FOR

CONNECTIONS WHEN

THE

LEADS ARE

POSITIONED

A C

COR

DAN

C E WITH

THE

PICTORIAL

DIAGRAM.

THE

EVENT

THAT

THE

TRANSFORMERS

ARE

RETURNED

THE

FACTORY

FOR

REPLACEMENT

INSPEC-

TION,

THE

ADS

,MUST

SAB

LENGT

HOR

THE

WARRANTY

WILL

VOIDED.

('1

Repeat

step

for

the

left

output

trans-

former

and

the

left

screw

terminal

strip.

(v{

Connect

the

negative

end

the

other

MFD

capacitor

lug

the

lug

strip

and

the

positive

end

lug

#1.

18 (v1

Repeat

step

for

connection

and

V3.

(VJ

Repeat

step

for

connection

left

power

takeoff

socket.

(v)

Repeat

step

for

right

output

transformer.

The

blue

lead

twisted

with

the

green

and

goes

V6 (8),

green

#4,

while

the

blue-white

and

green-white,

after

twisting

together,

are

connected

pins

(8)

and

(8)

V7.

("'1

rim

the

leads

of a

6800

ohm

(blue

-gray-

red)

resistor

1".

Connect

one

lead

lug

#1of

the

filter

capacitor

(8).

Connect

the

othe

end

lug

the

filter

capac

itor.

("1

Connect

one

end

of a

wire

lug

1of

the

right

ide

bias

potentiometer

(8).

Con-

nect

the

other

end

lug

#1of

the

left

side

potentiometer

(8).

(t1"

Connect

one

end

of a

5-1/4"

wire

lug

(8).

Connect

the

othe

end

lug

the

quad

filter

capacitor

(8).

24 (0'

Cut

both

leads

another

10,000

ohm

(brown-

black-orange)

resistor

1".

Connect

one

end

lug

the

seven

lug

strip.

Connect

the

other

end

lug

1of

the

strip

(8).

Connect

one

end

of a

wire

lug

the

lug

strip

(8).

Connect

the

other

end

the

ground

lug

near

the

filter

capacitor.

See

pictorial.

(t..r

Connect

one

end

of a

wire

lug

3of

the

lug

strip~,

(S).

Connect

the

other

end

lug

1of

the

left

bias

potentiometer.

("1

Connect

one

end

of a

wire

lug

the

lug

strip

(8).

Connect

the

other

end

the

negative

(top)

lug

the

selenium

rectifie

(8).

(V'j

Connect

one

end

wire

lug

#3 of

the

right

side

bias

potentiometer

(8).

Con-

nect

the

other

end

lug

#3of

the

left

side

bias

potentiometer

(8).

(0'

Connect

one

end

wire

lug

the

lug

strip

(8).

Connect

the

other

end

lug

the

left

bias

control.

(.-1

Connect

one

end

15.6

ohm

res

istor

the

ground

lug

base

of V2

socket

(8).

Connect

the

other

end

#8 of

V2.

(VI

Strip

both

ends

of a

wire

1/2".

Feed

one

end

through

V2 (8)

and

connect

#·8

of V2 (8).

Feed

the

other

end

through

of V3 (8)

and

connect

411

V3.

Connect

one

end

of a 4

-1/2"

wire

of V3 (8).

Connect

the

othe

end

the

left

power

takeoff

socket

(8).

36 M

Connect

one

end

the

othe

15.6

ohm

resistor

the

ground

lug

the

base

socket

(8).

Connect

the

other

end

#1 of V7.

Twist

together

pair

wires

except

for

1-1/2"

each

end.

Connect

one

end

one

wire

#2 of

(8).

Connect

the

other

wire

#7 of

(8).

Connect

one

the

other

ends

V6.

Connect

the

remaining

end

V6.

Twist

together

pair

wires

except

for

1-1/2"

each

end.

Connect

one

end

of one

wire

(8).

Connect

the

other

wire

#7of

(8).

Dres

the

pair

the

front

panel

the

chassis

and

over

tothe

right

power

takeoff

socket.

Connect

one

end

the

pair

#1 of

the

takeoff

socket.

Connect

the

other

the

twisted

pair

the

takeoff

socket.

(.q'

Connect

one

end

of a5"

wire

lug

#1of

the

lug

strip.

Connect

the

other

end

lug

#6.

Connect

the

negative

end

(-)

of a50

MFD

capacitor

lug

the

seven

lug

strip.

Connect

the

positive

(+)

capacitor

lead

lug

#1.

(t:1"

Cut

both

leads

of a

10,000

ohm

(brown-black-

orange)

res

istor

1".

Connect

one

end

the

resistor

lug

#4 of

the

lug

strip

and

the

other

end

lug

#3.

(-7

Twist

the

blue

and

green

leads

from

the

left

output

transformer

together

and

connect

the

green

lead

#4 of

V3.

Connect

the

blue

lead

(8).

Twist

blue-

white

and

green-white

together

and

connect

the

blue-white

lead

#3 of V2 (8).

Connect

the

green-white

lead

(8).

(p1f

16 (0

(ur

Connect

the

center

(common)

lead

the

double

x.02)

disc

capacitor

lug

the

lug

terminal

strip.

Connect

one

the

outside

wires

lug

the

strip

(8)

and

the

other

outside

wire

lug

#7 of

the

strip

(8).

(-1

Strip

both

ends

of a

wire

1/2".

Feed

one

end

through

#8 (8)

and

connect

#1 of

(8).

Feed

the

other

end

through

#1 (8) of V6

and

connect

of V6.

(v)

Connect

one

end

4-1/2"

wire

(8).

Connect

the

other

end

the

right

power

takeoff

socket

(8).

39 (I/j

Connect

one

end

of a

1000

ohm

(brown-

black-red)

resistor

of V2 (8).

Connect

the

other

end

#6.

Repeat

for

V3, V6

and

V7.

Keep

the

resistor

pigtails

short

(about

1/2")

for

all

four

these

resistors.

40 (0{

Mount

the

printed

circuit

board

-3

from

the

bottom

the

chassis.

Note

the

num-

bers

the

eyelets

are

upright

when

look-

ing

from

the

rear

the

chassis.

Use

4/40

screw,

lockwasher

and

nut

each

mounting

hole.

The

two

wires

from

the

board

s h a u Id

straightened

carefully.

These

are

used

later

step.

making

solder

connections

the

printed

circuit

board,

all

connections

are

made

the

numbered

eyelets

the

board.

this

way,

there

danger

damaging

the

printed

wiring

the

components

which

are

part

the

board

sembly.

These

eyelets

already

have

solder

them

and

very

easy

make

sol

connections

the

board.

The

lead

wires

should

have

their

ends

stripped

back

about

1/4",

and

these

stripped

ends

should

tinned

heating

with a

soldering

iron

and

touching

against

the

solder.

When

the

wire

soldered

the

eyelet

the

board,

the

eyelet

heated

until

the

solder

flows;

and

then

the

wire

end

pushed

into

the

eyelet

and

held

place

until

the

solder

sets.

This

type

soldering

can

done

with

very

small

iron,

and

preferable

not

use

any

heat

the

eyelet

the

board

than

required

get

the

solder

flow.

(~Connect

2-3/4"

wire

from

eyelet

#23 (8)

the

printed

circuit

board

(8).

('-1

Connect

wire

from

eyelet

U22 (8)

tl6 of

(8).

Connect

wire

from

eyelet

#19 (8)

filter

capacitor

lug

#3.

44 (tI) Cut

the

leads

of a

22,000

ohm

(red-red-

orange)

res

isto!'

1".

Connect

one

end

the

resistor

capacitor

lug' #3 (8).

Con-

nect

the

other

end

capacitor

lug

114.

45 (0

Connect

3-1/2"

wire

from

eyelet

#20 (8)

capacitor

lug

(8).

("1

Observe

two

wires

extending

from

the

printed

circuit

board

just

under

the

input

socket.

Connect

the

extended

wire

the

right

the

ground

(short)

lug

the

right

input

socket.

Con

n e c t

the

left

extended

wire

the

ground

(short)

lug

the

left

input

socket.

47 (V)

Connect

1-1/2"

wire

from

eyelet

#18

(8)

lug

the

right

power

takeoff

socket

(8).

Twist

together

pair

3-1/4"

wires.

Connect

one

pair

ends

eyelets

(8)

and

#16

(8).

Connect

the

other

ends

pins

#1 (8)

and

#2 (8) of

the

right

power

takeoff

socket.

49 (v')

Connect

one

end

of a

ohm

(brown-black-

black)

resistor

from

eyelet

#10 (8)

#3 of

the

right

power

takeoff

socket

(8).

50 ("1

Connect

one

end

of a

2-1/2"

wire

eyelet

(8).

Connect

the

other

end

lug

#2of

the

right

potentiometer

(8).

('"1

Connect

one

end

of a

5-1/2"

wire

eyelet

#14

(8),

and

connect

the

other

end

of V6 (8).

Connect

wire

from

lug

#3 of

the

input

switch

(8)

the

long

lug

the

right

input

socket.

({/)

Connect

one

end

of a

470,000

ohm

(yellow-

violet-yellow)

resistor

long

lug

right

input

socket.

Connect

the

other

end

the

ground

(short)

lug

the

right

input

socket

(8).

(£11

Connect

one

end

of a

470,000

ohm

(yellow-

violet-yellow)

resistor

lug

#1of

the

input

switch

(8).

Connect

the

other

end

the

ground

short

lug

the

left

input

socket

(8).

Connect

one

end

of a

1-3/4"

wire

eyelet

#17 (8).

Connect

the

other

end

the

long

lug

the

right

input

socket

(8).

(/.-1

Connect

one

end

of a

3-1/2"

wire

eyelet

#7 (8).

Connect

the

other

end

the

long

lug

the

left

input

socket.

Connect

short

link

wire

from

the

left

input

socket

long

lug

(8)

lug

2of

the

input

switch

(8).

Connect

1-1/4"

wire

from

eye

let

#3(8)

115

the

left

takeoff

socket

(8).

59 (t/f"

Con

n e c t

one

end

of a10

ohm,

(brown-

black-black),

sis

tor

eyelet

#8 (8).

Connect

the

other

end

#3 of

the

left

power

takeoff

socket

(8).

(,;/)

Twist

pair

3-1/2"

wires

together

and

connect

one

pair

ends

eyelets

(8)

and

#5(8).

Connect

the

other

pair

ends

pins

(8)

and

(8)

the

left

power

takeoff

socket.

(vj

Connect

one

end

of a

2-1/2"

wire

eyelet

(8),

Connect

the

other

end

#6 of

(S).

Connect

one

end

of a

3-1/2"

wire

from

eyelet

(S).

Connect

the

other

end

(8).

63 (I/)

Connect

one

end

of a

2-1/2"

wire

eyelet

#6(S).

Connect

the

othe

end

lug

#2of

the

left

potentiometer

(S).

(V)

Connect

one

end

wire

(8).

Connect

the

other

end

eyelet

#11 (8).

important

keep

this

wire

the

chassis

and

carried

around

the

printed

cir

cui

board,

shown

the

pictorial.

Connect

one

end

of a

wire

eyelet

(8).

Connect

the

other

end

solder

lug

near

filter

capacitor.

66 (r/)

Connect

one

end

of a

12"

wire

lug

#1of

the

left

screw

terminal

strip

(S).

Connect

the

other

end

eyelet

#12 (S).

See

pictorial.

("1

Connect

one

end

of a

10-1/2"

wire

lug

(S)

the-

teft

screw

terminal

strip.

Connect

the""'other

end

the

solder

lug

near

filter

capacitor.

«(.))

Connect

one

end

of a 9

-1/2"

wire

lug

the

right

screw

term

ina

strip

(S).

Connect

the

other

end

eyelet

(8).

See

pictorial.

69 (e-j

Connect

one

end

wire

lug

#4 (8)

the

right

screw

terminal

strip.

Connect

the

other

end

solder

lug

near

capacitor.

(v)

Connect

short

link

wire

from

capacitor

ground

lug

(8)

solder

lug

near

capacitor.

Solder

all

six

wires

which

the

pair

solder

lugs.

( )

Insert

the

line

cord

through

the

grommet

the

rear

the

chassis.

Pull

through

about

five

inches,

tie

knot

and

then

pull

from

the

outside

till

the

knot

a g a

ins

the

grommet.

Separate

the

two

conductors

the

line

cord

the

knot

then

strip

about

1/2"

insulation

from

each

end.

Connect

one

end

lug

Bof

the

fuse

post

(S).

Con-

neet

the

othe

end

lug

the

-off

switch

(S).

This

completes

the

wiring

your

amplifier.

wise

back

and

check

all

connec-

tions

for

correctness

and

for

good

solder-

ing.

All

hardware

should

also

checked

for

tightness.

The

fuse

can

now

in-

stalled

the

fuse

post

the

rear

the

chassis.

The

four

rubber

feet

should

then

pushed

into

the

four

holes

the

bottom

plate

from

outside

tow

inside

and

seated

with a

twisting

motion.

INITIAL

ADJUSTMENT

Plug

the

EL-34

tubes

V2, V3, V6

and

V7.

Also

plug

the

7199

tubes

into

pI'

ted

circuit

sockets.

not

plug

GZ-34

rectifier

tube.

0h m

met

available,

measure

resistance

from

capacitor

lug

ground.

This

should

excess

one

hundred

thousand

ohms.

Inspect

wiring

make

sure

that

all

joints

are

soldered

and

that

parts

are

shorting

together.

Plug

line

cord

into

117

volt

line

and

turn

switch.

While

tubes

are

warming

up,

set

the

bias

adjusting

potentiometers

the

tel'

their

rotation.

This

approximately

the

correct

setting

and

can

serve

emergency

operating

adjustment

test

instruments

available.

V E

OPERATION

WITHOUT

CORRECT

BIAS

ADJUST-

MENT

NOT

RECOMMENDED

A8 IT

RE8ULT8

POOR

PERFORMANCE

AND

PROBABLE

DAMAGE

COMPONENTS.)

Your

D y n a

kit

includes

Dyna

Biaset

(patent

pending)

which

greatly

simplifies

setting

the

bias

voltage.

This

can

now

done

with

the

most

simple

and

inexpensive

types

meters

long

they

have

rating

of 1000

ohms

per

volt

higher.

The

correct

setting

the

bias

provides

total

cathode

current

for

each

pair

EL-34

tubes

100 mao

This

current

through

the

precision

15.6

ohm

resistors

produces

voltage

drop

exactly

volts

dc,

and

this

age

can

checked

#8 of

each

preamplifier

power

take-

off

socket.

volts

also

the

voltage

which

furnished

"0"

type

flashlight

dry

cell

Thus

any

fresh

cell

this

type

can

used

for

accurate

reference

standard

for

bias

setting.

The

procedure

for

setting

the

bias

meas-

ure

the

voltage

output

of a

"D"

type

dry

cell

and

note

the

meter

reading.

Then

insert

the

positive

meter

probe

the

hole

the

left

pream-

plifier

power

socket

(note

that

outside

the

chassis

the

n u m

bel's

are

counted

counterclockwise

from

the

keyway

while

inside

the

chassis

they

are

counted

clockwise).

The

negative

met

e r

probe

should

touch

the

has

sis.

lug

the

-34

rectifier

tube,

and

about

seconds

there

will

current

flow

which

will

cause

meter

deflec-

tion.

the

rectifier

warms

up,

the

reading

will

increase.

The

left

bias

potentiometer

should

adjusted

until

the

meter

reading

the

same

across

the

dry

cen

(this

reading

will

1.56

volts

the

meter

sufficient

accuracy).

This

adjustment

should

then

made

using

the

right

bias

potentiometer

and

measuring

the

voltage

118

the

right

power

takeoff

socket.

Then

repeat

the

setting

for

the

left

control

and

left

set

tubes.

There

may

Some

drifting

the

read-

ing

the

tubes

heat,

but

this

will

stabilize

within

minutes

after

which

further

adjustment

required.

Small

variations

will

occur

with

line

voltage

changes.

These

will

have

effect

performance.

the

setting

semi-

permanent

one,

times

tube

replacement

similar

repair

maintenance

work,

resetti.ng

the

bias

will

preserve

peak

performance

and

keep

distortion

absolute

minimum.

the

course

bias

setting

found

that

the

control

range

the

potentiometer

insuffi-

cient

obtain

the

correct

setting,

not

operate

the

amplifier

until

the

cause

the

difficulty

has

been

established.

Operation

with

incorrect

bias

can

lead

damage

the

output

tubes

and/or

other

components.

Note

that

the

use

directed

the

wiring

instructions

means

that

this

cannot

used

connection

point

for

preamplifiers

the

preamplifiers

take

power

from

the

power

takeoff

sockets

the

front

panel.

Most

preamplifiers

not

require

the

use

this

pin.

However,

for

those

which

do,

some

other

must

used

bias

check

point.

other

available,

the

connection

from

pins

1/8

and

the

pre-

amplifier

power

sockets

must

omitted;

and

bias

measurements

should

based

voltages

read

directly

#8 of

for

the

left

channel

1i8

for

the

right

channel.

PREAMPLIFIERS

The

Dynakit

Stereo

can

used

with

any

conventional

stereo

monophonic

preamplifier,

pair

monophonic

preamplifiers.

Preamp-

lifiers

which

con

t a i n

their

own

built-in

power

supply

can

used

connecting

their

audio

cables

the

input

socket.

Those

units

which

require

power

from

the

amplifier

can

readily

used

with

the

Dynakit

provided

that

the

power

sockets

the

front

panel

the

Dynakit

are

properly

wired.

The

preceding

instructions

include

the

proper

wiring

for

both

Dynakit

and

Heathkit

WA-P2

preamplifiers

that

these

can

inserted

without

modification.

Should

others

requiring

different

socket

connec-

lions

used,

the

socket

wiring

can

changed

suit

their

requirements.

PROTECTIVE

COVER

The

protective

cover

which

supplied

with

the

Stereo

has

been

designed

both

functional

and

good

looking.

should

used

the

amplifier

the

amplifier

located

where

can

inadver-

tently

u c h e d

anybody.

There

voltage

appearing

above

chassis

the

printed

circuit

board

which

not

lethal,

but

which

can

give

uncomfortable

shock.

addition,

the

tubes

get

hot

normal

operation,

and

touching

them

can

result

minor

burn.

Therefore,

the

protective

cover

should

generally

used.

The

amplifier

should

located

where

there

adequate

ventilation

least

one

foot of

space

above

and

afew

inches

all

around.

The

amplifier

can

located

away

from

other

elements

the

high

fidelity

system

there

should

need

put

it in

too

confined

space.

NEVER

put

anything

on top of

the

cover

which

can

obstruct

air

flow.

Always

use

the

amplifier

with

the

tubes

vertical

position.

The

cover

and

bottom

plate

arc

affixed

the

same

time.

The

amplifier

chassis

should

set

over

the

bottom

plate,

the

cover

lowered

over

the

chassis,

and

then

the

three

pieces

are

fastened

together

with

the

six

sheet

metal

rews

through

the

chassis

sides.

USING

THE

STEREO

The

Dynakit

Stereo

designed

used

any

three

different

modes

operation:

stereo-

phonic

use

which

separate

stereo

channels

are

carried

through

the

two

sides

the

amplifier;

high-low

frequency

amplification

where

one

chan-

nel

carries

the

low

frequencies

and

the

other

the

high

frequencies

with a

frequency

dividing

network

ahead

the

amplifier;

and

monophonic

use

with

the

two

channels

paralleled

that

watts

power

are

available.

stereo

use,

the

stereo

provides

watts

per

channel.

stereo

preamplifier's

two

output

cables,

other

left

and

right

signals,

are

con-

nected

the

input

jacks

the

ste

reo

70.

The

input

switch

set

"stereo",

and

remains

that

pos

ition

whenever

two

input

cables

are

connected,

allowing

the

preamplifier

all

the

switching.

The

right

loudspeaker

connected

the

"right"

screw

terminal

strip

between

the

"c"

terminal

and

the

terminal

corresponding

the

speaker's

im-

pedance.

The

left

loudspeaker

similarly

con-

nected

the

"left"

terminal

strip.

there

are

two

monophonic

preamplifiers

which

require

power

from

the

amplifier,

each

connected

the

respective

preamplifier

power

takeoff

socket.

provided,

these

will

accom-

modate Dynakit monophonic

preamplifiers

without

modif

ication.

The

stereo

can

turned

on and off

from

the

back

panel

switch,

this

switch

can

left

"on"

position,

and

the

amplifier

switched

from

one

the

switched

outlets

the

associated

pre-

amplifier.

High-Low

frequency

amplification

For

this

type

operation

the

input

switch

the

Stereo

70 should be

put

"stereo"

position.

The

low

frequency

output of

the

dividing

cross-

over

network

should

fed

the

left

input,

and

the

"left"

loudspeaker

output should

connected

the

bass

speaker.

The

high

frequency

output

the

diViding

cross

-over

network

should

fed

through

the

right

channel,

and

the

tweeter

con-

nected

the

"right"

loudspeaker

terminal

strip.

Monophonic 70 watt

amplification

For

monophonic

operation,

the

two

channels

the

Stereo

may

paralleled.

For

this,

only

one input

cable

connected

either

the

left

the

right

input (but not both),

the

input switch

set

"mono",

and the outputs

are

connected

together.

insulated

wire

jumper

should be

connected

from

"c"

the

screw

terminal

strips.

Another

insulated

wire

jumper

should be

connected

from

"8"

a 4 ohm

loudspeaker

used,

from

"16"

to"

16"

an 8ohm

16 ohm

loudspeaker

used.

When

using

the

16 ohm

loudspeaker

this

fashion,

the

amplifier's

maximum

power

output

not

great

because

of the impedance.

mismatch,

but

there

loss

power

when

using

a 4 ohm

8ohm

loudspeaker

specified

above.

The

maximum

power

available

intoa16 ohm

loudspeaker

still

watts,

however,

and

there

compen-

sating

factor.

The

distortion,

levels

below

max-

imum,

will be

reduced

this

type of connection.

What happens

that

the

operating

conditions

are

shifted

from

maximum

power

output

minimum

distortion.

This

same

operation

can

also

achieved,

course,

by connecting

8ohm

loud-

speaker

paralleled

8ohm

taps,

a 4 ohm

loudspeaker

paralleled

4ohm

taps.

Note

that

whenever the two outputs

are

paralleled,

only one

input

cable

should be

used,

the

other

input

socket

should not

used,

and

the

switch

"mono".

also

practical

use

the

"mono"

position

with a

single

input

source

with two

separate

loud-

speakers.

this

case,

each

speaker

connected

one of

the

screw

output

strips

using

the

imped-

ance

which

pertains

the

respective

speaker.

jumpers

are

required

between

the

output

strips.

Amonophonic

preamplifier

i c h

requires

power

from

the

amp

can

connected

either

of the two

power

takeoff

sockets.

ENJOYING

STEREOPHONIC

SOUND

tel'

0n i c sound 0

e r s

important

enhancement

enjoyment

your

high fidelity

system.

The

proper

setup

and

use

your

stereo-

phonic

system

will

bring

considerable

satisfaction.

However,

stereophony

introduces

problems

in high

fidelity

reproduction

which

can

dim

ish

your

enjoyment

your

system

unless

these

prob-

lems

are

understood

and

corrected.

These

few

notes

the

subject

should

assist

materially

the

installation

and

use

of a

stereophonic

system

which

adds

your

listening

pleasure.

The

pieces

equipment

used

should

similar

possible

each

channel.

This

particularly

true

for

the

loudspeaker

used.

Different

types

and

brands

speakers

have

very

great

differences

frequency

response

and

other

important

characteristics.

If,

for

example,

one

speaker

has

peak

response

certain

fre-

quency

where

the

other

does

not,

the

stereophonic

balance

will be changed

that

frequency.

The

need

for

frequent

rebalancing

due

this

type

dissimilarity.

There

has

been

relatively

high

proportion

dissatisfaction

with

stereo

which

has

arisen

be-

cause

the

attempt

attach

inferior

second

channel

complete

system.

this

channel

differs

from

the

first

channel

frequently

destroys

any

potential

benefits

stereophonic

sound.

The

proper

reproduction

of monophonic

discs

through

the

stereo

system

requires

the

cancella-

tion

identical

signals

(of

opposite

phase)

that

there

no unwanted

vertical

signal

component

the

output.

This

requires

either

the

parallelling

the

two

sides

the

cartridge

the

parallelling

the

outputs

identical

preamps.

the

preamps

are

slightly

different,

the

vert

cal

components

cannot

eliminated

properly.

In Dynakit

pre-

amplifiers,

the

critical

components

which

deter-

mine

the

response

characteristics

of the

preamp-

lifier

playback

characteristics

have a

tolerance

of only 1%

that

this

pro

b I e m cannot

cause

difficulty.

Channel

phasing

is a

problem

stereo

which

readily

solved,

once

understood.

If,

on a

single

sound, one

speaker

cone

moves

inward

while the

other

moves

out, the s y s t

not

properly

phased,

and

the

sound

area

between

the

speakers

will

lack

homogeneity.

All

tapes

and

all

discs

are

now

reproduced

that

their

phasing

consistent.

Therefore,

once

phasing

the

playback

equipment

set

can

maintained

for

all

tape

and

disc

sources

without

further

change.

check

for

proper

phasing,

playa

monophonic

recording

that

one

signal

comes

through

both

channels.

Then

move

back

and

forth

between

the

speakers.

phasing

correct,

there

will be a

Otros manuales para Stereo 70

Tabla de contenidos

Otros manuales de Amplificador de DYNACO

DYNACO

DYNACO Stereo 70 Manual de usuario

DYNACO

DYNACO Stereo 120 Manual de uso y cuidado

DYNACO

DYNACO PAS-4 Manual de usuario

DYNACO

DYNACO Dynakit ST35 Instrucciones de instalación

DYNACO

DYNACO SCA-80 Manual de usuario

DYNACO

DYNACO SCA-80 Manual de usuario

DYNACO

DYNACO PAT-4 Manual de usuario

DYNACO

DYNACO Stereo 70 Manual de usuario

DYNACO

DYNACO PWRAMP80 Manual de usuario

DYNACO

DYNACO Stereo 120 Manual de uso y cuidado

DYNACO

DYNACO PAT-5 Manual de usuario

DYNACO

DYNACO ST-70 Manual de usuario

DYNACO

DYNACO PAT-4 Manual de usuario

DYNACO

DYNACO PAS-4 Manual de usuario

DYNACO

DYNACO PAT-4 Manual de usuario

DYNACO

DYNACO MARK VI Instrucciones de instalación

DYNACO

DYNACO Stereo 80 Manual de usuario

DYNACO

DYNACO Stereo 400 Manual de usuario

DYNACO

DYNACO st416 Guía de inicio rápido

DYNACO

DYNACO ST-70 Manual de usuario

DYNACO

DYNACO Stereo 120 Manual de usuario

DYNACO

DYNACO PAS-2 Manual de usuario

DYNACO

DYNACO Stereo 70 Manual de usuario

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ASTRO HVO V40 P Manual de usuario

Marantz

Marantz SUPERSCOPE BLA-545 Instrucciones de montaje

NAD

NAD CI980 Manual de usuario

Technics

Technics SE-CH770 Manual de usuario

Harman Kardon

Harman Kardon HK6300 Manual de usuario

NAD

NAD T975 Manual de usuario

McIntosh

McIntosh MA6850 Manual de usuario

Electro-Harmonix

Electro-Harmonix ENGLISH MUFF’N Manual de usuario

Viatron

Viatron Autrix Manual de usuario

GME

GME GA9800 Manual de usuario

Atlas

Atlas CP700 Manual de usuario

Roland

Roland KC-1000 Manual de usuario

Pyle

Pyle PFMRA350BW Manual de usuario

Advantage

Advantage S-250 Manual de usuario

IRT Electronics

IRT Electronics DVA-3007 Manual de usuario

Dimavery

Dimavery BA-100 Series Manual de usuario

Sony

Sony XM-S400D Manual de usuario

Schertler

Schertler ROY X Manual de usuario