Hammarlund Super-pro_BC-779A Service guide

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INSTRUCTION

*SUPER-PRO"

RADIO

-

(100

400 kc and

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II\STRUCTION

O'SIJPER-PRO''

RADIO

-

(f00

400

kc

and 2.5

BOOK

RBCBIVER

-

20

mc)

MANUFACTURED

HAMMARLI.IND

MFG.

BY

CO..

INC.

PUBLISHED

THE

CHIEF

oRDER

NO.--

BY

AUTHORITY

OF

SIGNAL

OFFICER

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29

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I

f . GENERAL.-The

consists

of two

units:

})O\rER

Thc

a,

2. TYPE
ceiving

cuit desig"ned
signals. It
a standard
tions. Although
tion, it
given

3. MECIIANICAL
Pro

mounting,

a.

b.

ìB

trrbes arc

conneclor

f

OF

EQLIP\ÍE\T.-The

equipment

for reception

is

generallv

commercial

the

should

precision

receiving

receive

technical

equipment

having

Rack model

(l)

Over-all

(2)

Depth

(3)

Ileight,

Rack model

(l)

Over-all

(2)

Depth

(3)

Ileight,

calrlci

the {ollowing

receiver

behind

l0/2

power unit

width,

behintl

Bll inches.

DESCRIPTION

Super-Pro

RIiCI]IVER

in

their rcspcctire

are

emplovs

intended
power line

Super-Pro

the

care

apparatus.

DESCRIPTION.-The

width

lg inches.

panel,

inches.

19 inches.

panel,

receiving

STJPPI,Y

Irar.kerl

of

is

available

phvsical

weighs

t'eighs

sr-Paratelr'.

a

superheterorìt'nc

ampliturìe

to be

under

is

of rugged

and

treatment

55 ltrs.

lSf{

inches.

45

B)( inches.

equipmenr

srx'kcts

Super-Pro

modulated

operated

fixed

for two
characteristics

lbs.

anrl

re-

cir-

from

condi-

construc-

usually

Srrper-

types

of

:

OF EQUIPÙIENT

c. Table model

(l)

Over-all

(2)

Depth,

(3)

IIeight,

d. Table model

(I)

Over-all

(2)

Depth,

(3)

Ileight,

e. Rack modcl

equipped u'ith
racks.

(l)

Rack model
dust cover which
panel uith knurlerl
thtrmb
erìge

of

'2)

Rack modcl
fastened

sarnc

the

screlrs

(3)

Rack rnodel
po\r'er unit,
power
tion

fa,sten

unit have

against

reeeiver

width,

23 inches.

16l$ inches.

l2l{ inches.

power unit

width,

81é

13 inches.

inches.

Br,1 inches.

panels are

notches

receivt--r

scre\rs

fa-sten

clrassis.

lre

I

prxter

to

the panel

as

tl.rc reeeiver.

the

equipment,

as

dust

well

bottom

weighs

73 lbs.

weighs

19 inches

to fit

standard

is equipperl

is

fastcned

thurnb

the cover

unit has

.rrith

Similar thumb

dust

cover

both receiver

as the table

plates for

and damage.

39

lbs.

wide

to the

nuts.

to

a rlust

knurled

to the

mounting

and

relay

with

front

Similar

the rear

cover

nuts,

chassis.

and

protec-

a

(41

All front

baked

.

All

.f

controls
tified
functions

page 7.
chassis
serve

to connect

antenna

(l)

Power
terminaì
eable

(.2)

The
on
chassis

tìre frrse-holdcr

g.

Terminal
supplies
covers.
eqnipment is

fie.

5).

ELECTRICAL

1.
Pro receiver normally
Feparate unit

volt,

50/60 cycle,

power

consumed is

paneìs

black finish,

on

the front

bv markings.

are

explained

On

the

rear

will be

found

the

and

earphones

supplies

strips

(see

page 28, fig.

protecrive

firse is

the rear skirt

and

can

be repìaced

cal).

strips on

are

txrth receivers

protected bv

These c<'rvcrs

pul irt operation

DESCRIPTION.-The

receives

which in turn

single

phase power line. The

lB0 watts.

arc coate(l

power

for connecting

also operate from a storage
heater

power, antl

C-Rias voltages

"8"

(see

page

batteries

28. fig.

u'irh

unless otlrerwise

panel

are clearly

These

under

skirt

terminal

(see

are

controls

"OPERATION,"

of the

strips

cable,

output

page 28, fig.

also

equipped

the

9).

in a holder

of the

power

bv unscrewing

and

small

rectangular

mrrst be

in

place before

(see

its

power

connects

battery

The

for the

Super-Pro

to a 105/125

to supply

plate and

f0).

a special

specified.

iden-

and their

receiver

which

load,

9).

wirll

power

mounted

supply

power

page 18,

Super.

from

a

ayerage

will

the

5. POWER
otherwise
propriatelv
rear edge
available is

is

put

in

increasing

a.

The

OIITPUT.-The

specified,

marked

of the

approximately

the neighhorhood

as the

600 ohrn
providetl
an

appreeiable

speaker,

mission
and all
be

b. An

is
no

line.

audio frequencv

taken

8000 ohm

providerl

attempt

measllrements

6. FRIiQUENCY
of

the

Super-Pro
bands.
determined

The

sclection

by

the
trol. This control
band in

use.

o.

The coverage

100-200 kilocycles
200-400

has

two

terminals

chassis.

power outprrt

output

for

use under

amount of

reeorder,

at this

Aìl

output

or a

power

outpur

for monitoring

should

at this

R,\NGE.-The

receiver

is

of

any one

position of

is clearly

of

five

the

kilocyclee

10.0-20.0

Srrper-Pro,

output

impedances.

are located

The

total ourput

B rvatts.

of

3

watts

Undistorterl

with

is inereased.

(marked

all contlitions

power,

600 ohm

output

fidelity

measurements

rearlings

terminal.

(marked

purposes

be

matle

to

terminal.

frequencl'

divided into

of

these bantlg

the bancl-switch

marked

to intlicate

bands is as

2.5-

5.0 megacyclea

5.0-10.0 megacyclee

megacyclee

unless

Ap-

along

power

out-

distortion

,.SpKR")

requirinq

such

as

loud-

audio

trans-

shoultl

"P[IONES")

only,

and

take

power

ranse

five

separate

con-

the

follows:

the

is

is

a. The

amperes

tr.

The

applied in

c.

Tlre

tl

.t

total lteater current

at 6 volts.

total

plate

voltage

the following

125 volts

Q0

volts

"C"

(J

antlreres.

at

at .0045

Ìrias

.ll7 amperes

voltage

reqrrired

manner:

amperes

requiretl

required

is

is 45

is

6.25

225 volts

volts

at

In

b.

arìdition
control,
rvindows,

main

tuning

selected

bv the
automatic
band switch

Band

c.

narrorr

spread: For

range

spreading control

an arbitrarr-

to the markings

a rotating

exposes

mask"

a calibrated

dial to correspond

band switch.

the mask

through

gears.

simphhed

of

frequency,
is

provided. This control has

scale reading

on

the band-switch

with

appropriate

scale on

with the band

This operation is

is controlled

tuning

a separate band

from 0 to

100 throu

the

bv the

over

gh

a

7.

DIAL

is

calibrated

o.

8.

TUBE

are

ueed

o.

approximatety

quency
from
dialo
how
capacity
as

(l)

covered
that indicated
to

some

far

the
of

the

the

scale

approaches

To

cover
spread
the

it

high

ia

deeired

dial,

band

frequency

CALIBRATION.-The

directly

BAND

l0

mc-20

mc

5 mc-10
100
200

2.5

The
band

kc-200
kc-400

mc-5.0

above

spread

mc

kc

kc

mc

calibration

dial

COMPLEMENT.-The

in

the

receiver:

The

TYPE

óK7
óK?
6L7
6J7

6K7
6SK7
6SK7
6H6

óN7
6SJ7
6SK7
6H6
6CS
6F6

2.6F6

following

TYPE

5A
80

FUNCTION

lst

RF

2nd

RF
Mixer..
HF

Oseillator

letIFAmplifier.........

2nd

IF

3rd

IF -{mplifier..
Second
Noise

BF

Oscillator. yl0A

AYC

Amplifier..........

AVC

Diode.

lst

AF

2nd

AF

3rd

AF

tubes

FUNCTION

Plate

Voltage

C-Biae

170'.

lower

band

by

moving

spread

by

spread

ff

set

at

the

the

setting

frequency,

dial

is

condenser

100,

dial

will

o{

depending

movecl.

0.

a specific

the

main

end

range

dial

of

with

ehould

the

band

to spread.

main

tuning

in

frequency

eet

at

ae

CALIBRATION

100

kc per

100

kc

2

kc

5 kc

50 kc

holde

true

100.

followe:

division

per

divieion

per

division

per

divieion

per

divieion

only

foilowing

SYMBOL

Amplifier.

AmpliGer.

Amplifier.

Detector.

Limiter

Amplifier.

Amplifier.

Amplifier........V15A-VI6A

Rectifier

are

used

Rectifier.

. .

. .. . ..

. .....

.......

in

. .

VrA

V2A
VBA
V4A
VsA
VóA

V?A
VBA
V9A

VlrA
Vl2A
Vl3A
Vl4A

the

power

SYMBOL

vlB
v2B

the

fre-

extend

the

main

The

increases

the

band

be

set

which

dial

with

the

tubes

unit.

on

to

SENSITIYITY.-Normally,

9.
more

sensitivity
termining
ground
Regardless
the

background
trical
the

Ievel

very

o.

b. Full

factor

or

external

of

apparatus

or

intensity

difficult

As

a

guide,
tivity
ered

by

benefit

the capabilities

or

to obtain

characteristics

a

Super-Pro

installedo
choice

f0.

SELECTIYITY.-A

available
selective
range

is
cycles.
receiver
a degree

the

beet

interference.

in fig.

12,

a.

Radio

sufficient

(removed

of location.

in

this

point

of

approximately

This

wide

to be

used

of selectivity

possible

Typical

page

30.

Frequency

to reduce

from

the intermediate

b.

fntermediate
variable
filter
16

takes
where
effect.

band

degree

secondary
control

performe

over

out

of

kilocycles.

place

the

Radio

Yariation

width

of coupling

coils

on

the

thia

than

can

actually

in

practical

noise

not

generated

external

or

atmospheric

of

the

noise

desired

satisfactory

fig.

13,

page

typical

can

with

receiver.

of

the

excellent

be obtained

respect

wide

receiver.

the

Starting

crystal

from

range

for

fidetity

of

a great

can

be

with

found

seleetivity

selectivity

images

the

main

frequency)

frequency (465

wide limits.

the

circuit,

Some

deviation

on

the

two

Frequency

of

the

intermediate

is

accomplished

between

of

the

panel

marked

operation.

the

be

operation

of

the

(generated

conditions)

signal,

reception.

31, illustrates

of

the

five

sensitivity

only

to

the

range

filter,

100

cycles

selectivity

many

services.

which

the

leasr

curves

(pre-eelection)
or repeat

freguency

to

a

kc)

Vith

the

range

from

low

frequency

Etages

by varying

the

IF

transformers.

BAND

Super-pro

used.

ie

the

in

the

receiver,

it

bands

when

properly

antenna

of

selectivity

with

the

the

selectivity

to

permite

will

amount

ere

by

minimum.

eelectivity

the

is

from

this

have

frequency

primary

VIDTH

ha

The

de

back

receiver

wher

by

elec,

reacher

becomel

sensi

cov.

of the

and

mosr

16

kilo.

the
Usually
provide

of

shown

is
spots
twice

,

ia

crystal

3 to

figure

bande

some

the

and

The

ie

crystal

The

c.

has a clistinct
filters.
five degrees
settings

(t)

Thc

selectivitv
ratlio telephone
extreme interfercnee, the thirtl
mar­intelìigibilit-v

removed

frequencies.

(2)

The
reception
selectivity
though telegraph
on any
course,
other signals
made

filter

ernploverl

advantage

Resitles thc

OFF'position.

of selectivitv

control knob

the

of

first tn-o settings

in

tl.re

ovcr

other types

governed

br

on the

of

the cr_vstal filter

Super-Pro

panel.

control are r.speciallv

reception.

be used, thorrgh a good

of

thc

voice

due lo lack of the

In

portion

signal may be

higher

last tl'o degrces of selectivity

of radio telegraph signals

is more important than

signaìs

dcgree

of -selectivity depending,

on the amount

or disturbances

may be received

of interference

of the

varietv.

there

different

suitetl

cases

position

of

the

audio

are for

*'here

quality,

from

man'

of

are

to

of

of

f

l.

AUDIO FIDIìLITY.-There

trolling the

o.

qualitv of reprotluction

f)uring reception the overall
receiver controls
adjrrsted

to a

qualitv u'ill be deepened in

lack

ofhigh audio frequencies. As

is broadened.

the qualitv of response.

high

higher frequencies

the

are two factors

of the

selectivity

degree of selectivitf,

tone due to

stronger.

b. The audio

of the receiver can

part
what has already gone through the IF ampli­fier. fhe Super-Pro audio
tively
ducing

high

voice

quality

system, capable of

music

or

amplifier

with a good

fidelity.

Fidelit,v

c.

in operation

curves taken with

reproduced

are

the entire receiver
on

page 31,

con-

receiver.

of the

Vhen

the
the

the selectivity

become

only

pass

is a rela-

repro-

degree of

fig. l4'

l. CONNECTING
operating
ment,
temperature
obtaining
perature
bration.
r

ibration
the
In
therc are t$'o

.|eration
f,,r

position

it shoultl

antl

uniform

humiditv

or

the

Vhile

have

will

adjustetì

receiver

addition

rrsc

o.

is

to

connector

r-ith

rtith batteries.

l'acuum tttbes

The

,'t..

These

.-1rt't'tion antl

-rrre
r,'r't'ir

,11,,11p,1 lltr trr,,

all

('r.

lttlrr'.

the

EQUIPN{F,NT.-In

the Super-Pro

for

be borne

humirìit)-

performance.

Super'Prti

some

lhe receiver

polver

îrtbes

adjustment

an,l

in mind that

pla]-

have

will

effect

a

for

cables.
unit. and

are

rvere enrPlovetl

are in tlrr-ir

retttove

glass

INSTRUCTIONS

selecting

receiving

important part

an

\l.ide changes

effect

some

of

solid

is

on

lterformance

degree

high

power

in rhcir

tlrr'

unit

is for

One

the

respe(ltive

tluring

al the

rectifìr'r

factorv.

l)t'()l)cr

<'ardboartl packing

of seìectivitv.

other

sockets

lrrbes

equip-

evenness

in tem'

on cali-

construction'

tubes,

antl

normal

cable is

frnal

\lakc
in the

in

the

in

when

sock'

in-

thc

of

II

FOR

INSTALLATION

Then

polr'cr

pon'er

(l)

(?)

unit'

supplr

Remove
rcceiver
supplv

strips

minal

removing

of thc

rear

terrninal

on thc

strip

will

It

cable

the

on

rvith

sions

and

ceiver

installed

be

FORCE!

USE
prnperlt-.

*'hether

mine

properlv.

the

and

eablc.

strip

be

connect

together

large

attach

The

the

is

a simiìar

power

of

power

noted

correspond

terminal

the

power

without

If

remove

not they

or

certain

Be

as

terrninal

one

cable

one

terminal

rtnit,

calile

the

unit.

the

that

These

unit.

diffrcultv'

thev

antl

the

receiver

thc

follorvs:

cover from

of the power

cntl

having

rcferretl

cover from

attach

to

See

terminal

exactlv

boards

terminals

not go

do
examine

being

are

screws

and

the

ter'

two

After

to.

the

other

the

the terminal

28'

page

strips

dimen'

in

re'

the

on

can

NOT

DO

together

deter-

to

applieil

fully

are

If

b.

the equipment
teries,
ance
cable

having
consists

be the

power

The

c.

to

either
proximately
ventional
is

an
secondary
This
anced
minimum.

(l)

In
the

"4".
used,

unscrewed.
the screws

connections

with the

used

only

same

unit.

antenna

electrostatic

screening,

lead-in,

the case

terminals

drawing

for

one

of free

as for

input

a balanced

ll5

single

of

each

.

of the

feeders

at

If a

single

its

lead-in

Terminal

from

the

is

to

should

in fig.

battery

terminal

wires. All

normal

has

been

transmission

ohms

impedance,

wire

antenna

screen

antenna

together

reduces

transmission

should

the rear

wire

should

lugs

should

top.

See

be operated

be

made in
10,

page 28.

operation

strip,

the other

other

operations

operation

designed

or

and

ground.

bett'een

rr-ith

noise

be

of

the
type

primarr.

input

transformer.

a two-wire

pick-up

line

connected

receiver

of

antenna

be

connected

elip under

page

with

accord-

is

the

with

to couple

lini

of

to

a con-

There

to a

lead-in,

to the

marked

28.

bat-

The

end

will

and

bal-

one

the

ap-

is

to

(2)

(3)

Earphones

d.

propriate
on

testing.

terminal

Next,

e,

the AC

one

of

o'4"
good

For reception
band
signed
connected
grade

efficiency.

It is

chassis

plished by
one

cover

the front

see

the
terminal
ground.

of high

doublet

lead-in

not essential

but this

of

the thumb

to

the rear

should

plug to

pane]

Earphones

strip on

connect

porver

line.

"OPERATION."

"4"

terminals,

should

over

frequencies,

or

similar

to

the receiver

cable,

will result

to

may

connecting

screws

of

be connected

jack

the

(see
may

the rear

the

power cord

For

and

be

connected

a relatively

a
tuned

through

ground

be readily

a ground

securing

the chaseis.

provided

fig.

2) for

also be

connected

skirt of

(see

further

the

othc

to

narror

suitably

in

exceptionr

the receiver

wire

with

preliminary

the chassie

information,

de

antenn

a high

accom

under

the dugr

an ap,

for them

to s

fig.

5) tc

l. PLACII.IG

the

equipment
possible
shipping.

o.

The
ready

oocket
of

(I)

mechanical

tubes

the

It
from

order

IN

OpE

RATTOII.-After

should

defects

for

this

installed

being

tube

is necessary

in

marked

which

the rack

to

make

be

checked
caused

equipment

their

proper

with

belongs

to remove

model

sure

that

ADJUSTMENT

installation,

.thoroughlv

by

handling

are

shipped

sockets-each

the

type

number

in

that

socket.

the

dust

cover

of

the

Super_pro,

all

tubes

are in

for

and

al-

in

III
AND

OPERATION

their

proper
moving
fasten
Similar

of

the chassis

This

dust cover

until

the equipment

ing

satisfactorily.

additional

vicing

(2)

The dust

power unit
jackets

places.

the knurled

the

dust cover

thumb

be

cover

from the

screlr-s

must

operation

required.

must

to remove

This

is done
thurnb
to the front

on

also be

mav

is

found

This will

should

also be taken off

two rectifier

nuts

the rear

removed,

be left removed

to be operat-

avoid an

further ser-

the cardboarJ

tubes.

by re-

which

panel,

edge

the

(3)

Roth dust covers
the equipment
operating

ADJUSTMENT.-This

2.

has

satisfactoril

equipment

pletell adjusted at the factory

ment

should be necessarv

prior to

should be replacetl

been found

v.

has

been com-

ancl no

further

adjust-

actual operation.

after

to be

interference
justed

pending
sired.

is

a wider

to

upon the amount

fn

general,

adjustetl to the

qualitv with

tone

ferenee.

not serious, it

can

dcgree of selectivity,

of fidelity

this eontrol shoultl

banil n'idth

providing

a minimum

be

ad­de­de-

be

best

of inter-

3. OPERATION.-Although
technical
of

eontrols, it is relatively
14 controls
used at the

sary for operation
for which
controls

A.

of

piece

apparatus with

easy

on the panel. Ilowever,

same time. The number

*'ill depentl

the receiver is

are:

RAND

SWITCII AT]DIO
T,ÍAIN TLINING
RAND SPREAD

(l)

The remaining

play as

b. Assuming

conditions

that the earphones,

controls

and antenna have been connected

instructions, the various controls
in the following positions:

the Super-Pro is a highly

quite a large

to operate.

thev

of controls

on the

tvpe of service

to be used.

number

There are

not

are

neces.

The maior

GAIN

SENSITIVITY

are brought into

demand

their use.

power

supplv

according

should be

all

to

set

(3)

All
shoulcl
trol
wider band

cult. Rand

tuning,

be done with

set at 3. Other settings provide

or

with

without the meter,

the hantl

making accurate

tuning diffi-

width adjustments

width con-

mad.e after the signal is tuned in properly.

14) The beat-oscillator
SIGNAT,

switch

is turned on when

is in the CW

position. The
heat-oscillator control varies the pitch of
the heterotlr.ne

or beat between

lator and the incoming signal. This feature

is used for code
weak moclulated

(5)

The I,IMITER
limiter on and off.
valuable

on the
automobile
similar disturbances

reception

signals.

control turns the noise

The noise limiter is

higher

ignition interference and other

are serious.

for loeating

and

frequencies where

a

should be

the

the oscil.

most

CRYSTAL SELECTIVITY...

PHASING.
BAND

LINIITER ......OFF

AUDIO
SEND_REC.

(l)

Then throw the
of the panel
position.

WIDTII .. . , . .. .3

AVC NÍANUAL. .. ....

sENSrIrVrTY.........

BAND SPREAD
MOD-CW.

GAIN.

BEAT OSCILLATOR...

switch in

power

(marked

This

puts

OFF-ON

the receiver in opera-

tion.

(

2) The band switch should be
band t'hich the operator
most active. Receiving
band u'ill
himself
band u'idth control

permit the operator

u'ith

the various

should be set at 3. If

, .OFF

.....On arrow

..AVC

.....10

.....100

...MOD

.. ..6

.....REC

....0

the center

the

to

adjusted to the

is likely to find

stations on this

{amiliarize

to

adjustments.

The

ON

So

c.

sary for
tion, the
set in the
TMTY

sensitivitv.

(l)

(2)

far, we

have consitlered adjustments

ratliophone reeeption.

AVC-MANUAL

MANUAL position

control turned

strong signals,

On
be turned

all the

cause overloading.

rìown to

this control should

rvay on because

If the

For code recep-

control should be

antl the SENSI-

,A.IJDIO GAIN
control is set at approximately
can be regulirted
adjustment

Because

of the type
in the Super-Pro,
effectively
The AYC action
have an
ters

effect

ofhigh speed

to control

with the SENSI'IIVITY

only.

of AVC system

signals

code

controlled

with

is slow enough

upon individual

code, but

the

overall

level of the signal.

it is fast

neces-

provitle

proper

it

volume

7,

can be very

this system.

not to

character-

enough

not

will

used

d.

The
operate
first
phone
tion

two

(l)

e.

The
SEND-REC
This
instant

when

ervstal

filter

beeause

three

positions

reeeption

where

interference

positions

After
control

are

rhe

is

adjrrsted
seleetivitv,
rrsed

to reject

t'rthistle.'o

receiver

can

switch

allows

the

service

it is

used

is

verl.

effeetive

of

its

exceìlent

are

generallr-

and

*-ill

serve

is

not

for

code

reeeption

CRYSTAT,

for

the

PII{SI\G

Ìreterotlvne

be

silenced

to

the
receiver
during

for

to

transmission

communication

and

stabilitv.

userl

for

code

serious.

erelusivelv.

SELECTMTY

the

desired

control

interference

bv

turning

SEND

remain

purposes.

easv

The

for

radio-

reeep_

The

desree

may

position.

reatly

periods

to

last

of

be

or

the

for

spread
easv

ú

For

earphone

into

the
panel.
the rear
These

jaek

the

The

S-meter
adjusted
as

a tuning

the receiver

coming
by

the
width
tuning

out

over

tuning.

operation,

jack

provided

A

set

of terminals

of

the chassis

terminals

on

are

the front

eonnecterl

operates

for

AVC.

This

guide. Its

approaches

signal.

lìxact

greatest reading

control

bv

rnust

means of

be

the

the

band

earphones

for

them

are

for

eonneeting

panel.

onlv

when

meter

reading

resonance

resonance

of

the

set

at

meter.

spread

are

on

rhe

also

available

earphone

in parallel

the

reeeiver

is

usetl

will

inerease
with
is

indieate,

meter.

The

3 for

dial

fr

plrrgqe

fror

wit

mainl

the

ir

ban

accrrrat

o

j

a

j.

All

tuning

I\G

control.

dial

is left

so

as

to
óelorr.
is

set.

(l)

The
ouslv
bands
maticallv
on

manner,

can

ar

spread

the

freqrrenev

band

throughout

covered

the

two

be

done

rvith

fn

this

ease,

100.

The

band

out

a narrow

to

sprearì

dial

the

bv

the

disconneeted

low

frequencv

high

frequeney

the

the

spread

band

rr.hich

the

operates

three

high

receiver,

br.

the

bantls.
bands

MAIN

of

TUI\_

bantl

spread

dial

operates

frequencies

main

dial

continu_

frequencv

but

is

auto-

band

switch

In

this

can

be

NTAINTENANCE

IV

AND

(I)

The
more
adjustment
the

s;stance
means
mav
approximately
The
on

an

so

adjusted
change
6 db.

REPAIR

meter

calibration

or less

second

arlritrary.

at

the rear

(letector

in shunt

of

this

a(ljustment,

be obtainerl

l0

normal

input

factory

of .50

each

in

signal

'.S"

in

A

of

diorle

with

the

on

ant

anrl

10,000

adjustment

mir:ro-volts,

"S"

nurnller

input

of

screw

the

varies

an

input

chassis

numbers

meter.

59 reatlin

i

drive

nea

the re

R.

betweer

micro-volts

is

madr

anrl

wher

reJ)resents

:

aJrJrrrrrirnatelr

f.

GENERAL.-The

spected
necessarv
tubes
indicating

justments

and it

tubes be

and

should

is

used

adjusted

over

bc

lo*-

sensitivitr.

u.ere

stronglv

for

receiver

and

long

periods

tested

at regular

shoukl

originallv

recommendetl

replacement

has

servicing

of

operation.

intervals

Ìre

rnatle

rvith

that

purposes.

been

carefullv

is

not

replacetl.

R.C.A.

the

generall\.

Vacuum

and

those

All

tubes

same

tvpe

in-

atl_

a.

If

the receiver

it

mav
condenser
socket
labrrlations

part can
lieve
describecl

bct'orncs

be rlrrc

voltagcs

bc

that rletailcrl

tr)

()l){'n

or

Íìrì

arrrl r.,rrnparing

in

tlrc clrarr

quir.klv

sint'c

most

r',rrnlrlclr,ll

a:[ìr)rt{,rl

r{':ist()r.

llragc

rliscor.cretl.

continuitr-

()t)crators

inoperative,

filtcr

or

br--pass

[lr

rneasuring

thcrn rvith

l3).

thc rlefecrive

\lte

do

not

tests

shoulrl

arc familiar

the

lre-

lrr.

with

ordinary

the

component

tive
power

cover

tom

are

parts
should

resistor

any
locating
gram,

b.

c.

receiver has been accurately

The
factory
should

either sensitivity

to be

pear

checked, it

been

alignment.

cover

tom
adjustments
structions

should
performance
Anv changes
tively

when

cised

true

cially
which should

tuning

main
calibration.
screw

The Test
calibrated

signals

kc and

400
oscillator

of 100
approximatelv
aÌigning

For IF alignment

frequency

Tl're

is e\tremel\
calibration is to be correct.

The Output

cI.

modulation frequency
preferablv

procedure

parts. fn both

supply

be removed

and

retain this

small

driYer

micro-volts and

units,

should be removed

plates

accessible.

from its cabinet.

or capacitor may

the symbol

referring to the

and under

plate

are

be experienced

checking adjustments.

of the fIF Oscillator

Oscillator

covering

should

the RF

normal

adjustment indefinitely.

or selectivity

below normal, and all tubes have

may

Removing

of

accessible. If the

carefully carried out, no difficulty

of the

original settings will be

from

and extreme

I\OT be disturbed unless the

is definitely

dial

not manipulate the insulated

Do

indiscriminatelY.

instrument

frequencies

2.5 and
have an outprlt

100

and
these

calibration of the test oscillator

important,

Meter should respond to the

{00 cps, and should provide

for determining

(rack

mounting)

The

table model

be obtained

number

the receiver will make all

20 mc

ohms {or best results

on the circuit

parts list.

aligned at the

operating conditions

(or

desirable to check the

be

the dust correr and bot-

restoring

in

receiver.

should

producing

an output

HF Oscillator circuits.

values are not critical.

of the test oscillator,

CALITION:-

care should be exer-

circuits

known to be off

be an accurately

between

(also

465

if

the

defec-

receiver

following in-

the

This is espe-

of

impedance of

receiver dial

and

the bot.

so that all

receiver

Values of

by

dia-

Vhen

both) ap-

original

rela-

(fig.

l1)

modulated

100 and

kc). This

the order

when

at

least half-scale deflection for l0 volts.

greater

sistance should

e. An insulated screw driver

thick at bit, is required for aligning

2. PRELIÀíINARY
OFF-ON switch to the ON position and allow
receiver to warm
beginning

the SPKR terminals

to
receiver chassis.

IF-AVC-BEAT OSC.

3.
the
neet the output
tector
panel

adjustments. Connect the output meter

test oscillator to approximately

(6L7)

tube

controls should

SENSITMTY.

AVC_MANUAL....,

N{OD
SEND_REC.
RAND SWITCH
AUDIO GAIN.
CRYSTAL
CRYSTAL

BAND WIDTII
BAND SPREAD

o. IF

ALIGNMEI\T

dial should

ing
should
local signal.

the

manner.

switch
AVC, and
Turn
and adjust
imum
The
in this

particular

be taken

proper

on 3, the

off the

deflection

adjustment

manner

agreement

exact

checked.

modulation

the
tuning
until

CRYSTA'L

of the

the

be

PROCEDURE.-Throw

up approximately

located at the rear

control

to the

through

be set

CW.

SELECTIVITY.
PHASING.

be set

to avoid

Now tune the

alignment

Set the

advance

quartz

After

alignment

CRYSTAL

modulation

frequencv

its

of the

of

is necessary

with

crystal

reducing SENSITIVITY

may

osciìlator

test

SELECTIVITY

than

500 ohms.

9

wide and

164"

one hour

ALIGNMENT.-Adjust

465

cap of the lst de-

grid

fixed condenser. Front

a

as follows:

. . . . . . . . . . . . .

. ......,3

DIAL........IOO

CHECK.-The

near

frequency

AVC-MANUAL

the SEI\SITIYITY

"S"

the test

the

be switched

check

. .0

...MANUAL

.....MOD

...,REC

.......2.5-5.0

........I0

. . . .OFF

2.5 mc, but

tuning

test

in the

SELECTMTY

of the

slightly

meter

oscillator

in order

natural period

in the

must

completed.

is

fts

.025"

the receiver.

before

of the

kc

and con-

mc

.(Jn arrow

main tun-

in a powerful

oscillator

following

switch

to 10.

oscillator

test

until

is obtained.

frequency

insure

to

receiver

but

on,

be altered

not

and

re-

the
the

care

to

on

max'

of the

being

to

the

The

AYC'

0

t0

MANUAL
their original
respectively
til a suitable
A

half-scale reading

5 or 10

b. Now check

antl lower

transformers

trimmer in

meter. If

results in
SENSITMTY
reading
plate circuit
tested in
loroer adjusting
This

screw varies
iron core
eetting

trrnes

the
properly
This

circuit

by

the

modulated

graph.

AVC ALIGNI{IINT

c.

other

controls as aboveo
the test
GAIN
SENSITIVITY
GAIN
meter
T6A for minimum

"S"

meter reading

time the output meter

BF

d.

OSCILLATOR

Continuing with

Alignment)

lator

leaving
connect
headphones,
loud speaker.
and

see that BEAT

exactl,v

controls

and SENSITIYITY

volts

the

(plate)

T4A for

one or

a material

back to half-scale.

of

the same

in coil

of the

grid coil

adjusted

mayo

"visual"

oscillator

oscillator frequencl-,

0, s*'itch

to

to restore half-scale

and

adjust single trimmer

switch off

it tuned

output

or replace

Throw

on zero.

may

now

settings

output

will be

alignment

T2A

screw on

upper

method

of

OFF

meter

reading

in

the

satisfactorv.

of

air trimmer

and

T3A

peak reading

more clf

increase

sufficiently

the crystal

fashion

the

L26A.

L27 A,

b.r the foregoing

however,

these

Alignment

filter

the

position of

f)o

adjtsting

as this circuit

be correctly

employing

and cathode

CHECK.-Leaving

and, uithout

to AVC,

to i0. Increase

reading

output meter
should

ALIGNMENT
controls

meter

If

o'peak"

reading

as

modulation

to same

and

plug

meter

SIGNAL

OSCILLATOR

tone in

be returned

and MANUAL

advanced

is

secured.

neighborhood

both

condensers

and

of

of output

to

bring meter

TIA

by means

side of

the

not

screw

a frequency-

reduce

and increaee

condenser

reading.

at

"dips."

CHECK.

above

of

frequency.

in a

with

switoh

headphones (or

(grid)

upper

in

the

single

the output

adjustments

reduce

of

can

of

the unit.

powdered

disturb

which

cannot

method.

aligned

rav

oscillo-

tlisturbing

AUDIO

AUDIO

on output

The

the same

(AVC

test oscil-

Dis-

pair

suitable

to CW

knob

un-

IF

the

the

the

be

all

in

of

is

to

of

be

epeaker)
trimmer
until such
perfect
sound will
the BFO

quency

audible difference

This

the
ofr 0 toward one side
movement results in an audible tone

pitch

either

IIF

e.

-The
depends

which
higher
when
the

10.,165
oscillator
frequency
is

far
ol known
readings.
at 100
frequencv

(-l)

is not very

condenser

is the case.

alignment

be heard since the test

will be oscillating

and consequently

condition

BEAT OSCILLATOR

as

the pointer is turned away

aide, the BFO is

OSCIT,I,ATOR

accuraey

solelr- on

in

the Super-Pro

than the

the

receiver

frequency

mc.

Vhile

can

bc

measuring

simpler

v'hen

When
calibration
correction, this mav be aceomplished
follows: Reference
(fig.
oscillator adjustments

frequencies at
made. If tÌre 2..5

corrected thc test osr-'illator rnal be
ratelv
monic

5.0 mc end of the band. The output
the test oscillator shoultl be
and the SIG\{L srvitch on the receiver

turned to CS-. The BEAT OSCILLATOR
control
at 10, the AVC-MANUAL switch on
MANIUAL,

to check

frequency

Be

sure

making

bands.

it has been tletermined

1t) rvill show

set to

(if

should be at 0, the

low in

near

when this test

or

may

be determined

CALIRRATION

of

the main

the

signal

is

tuned

of

the IIF

the

measured

equipment

and noting

the

this

is

sufficiendy

which

2.5 mc

strong enough) used for the

and the

pitch,

the

fn case

there

"beat"

frequency.

to 5.0

note

control knob

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LIST OF

MANUFACTURERS

No.

American

I

Beìden

2

Beede

J

Bussmann

4

D

Chicago
Cornell-Dubilier

6

Littìefuse

7

Ce'rcral

B

Ilamrnarlund

9

l0

International

l1

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13

Crrtler-HamIner,

Kurz-Kasch

14

Acrovox Corp..

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17
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19
20
21

22

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26

R.
\f,-eston Fllectrical
Utalì Radio
National Lock Co.

(

)aL \l

R.C.A.
R.C.A.
F. \\-. Sickles
\\'irt
Par-\Ietal
American

N,c.MB

Phenolic Corp.

N{fg. Co.

Fllectrical Instrument Co.

1\{fg. Co.

Transformet Corp.

Iilectric Corp.

Inc.

IÌlectric Co.

NIfg.
Resistance Co.

\lfg.

Co.

ones

Iì.

J

Inc.

Co.,

.

Co.

Inc..

.

Co.

\Iallorv & Co., Inc.

.

Instrument Co.

Products Co.

.

fg. Co.

Co.

.
.

NIfg. Co.
\Ifg.

Co.

Companv

Products

Corp.

limbìem ComJranr

Aoonpss

Chicago,
Chicago,

Ill.

Ill.
Penacook, N. H.
New York, N. Y.
Chicago,
South
Chicago,
Cleveland,
New

Ill.

Plainfield, N.

Ill.

Ohio

N. Y.

York,

Philadelphia, Pa.

Ill.

N.

Y.

Brooklyn,
Chicago,
Milwaukee, Wisc.
Dayton,

Ohio
lrlew Bedford, Mass.
Indianapolis, Ind.

Nervark,
Chicago,
Rockfortl,
Chicago.
Harrison,
Camden,
Springfield,
PhiladelPhia,
Long Island

Utica,

N.
Ill.

Illinois

N.

N.

N.

Y'

J.

Ill.

J.

J.

Mass.

Penna.

Citv,

N'

J.

Y.

33

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t

CAUT'ION

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banri

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io

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back

to

the

For

than

the

idler

result

turned.

can

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into

permit
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example:

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in

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with

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seen

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position

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iom
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wifi':
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tighfly

drive

pliei':.

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press

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a hex

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since

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of

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caused

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shiprnent

again:t

mask

is

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the

mask

relieved

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pernr;t

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a

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can

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the

niust

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fhe

main

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wiil

by

springing

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mask

dial

drive

sui"e

ihe

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sure

discs

fightened

dialto

be

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the

causiirg

dial

guides

fhrough

make

the

the

to

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remove

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friction

are

with

completely

iump

and

several

fhe

main

to pinch

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by

band

switch

dial

guide

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the

bot-

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replaced

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the

or

out

are