Hammarlund SP-600-JX User guide

GENERAL

PURPOSE

COMMUNICATIONS

MODEL

INSTRUCTIONS

SP-600-JX

RECEIVER

460

West

THE

Manufactured

HAMMARLUND

by

MFG.

34th St. New York

P,iftted

in

U.S.A.

CO.

1,

INC.

New York, U.S.A.

r

F"RONT

SP-600-JX

F'IG.l

VIEW

or

IN

RECEIVER

CABIIHT

TABLE

OF

CONTENTS

Titk

Technical

I General Description

II

III

IV

V

VI

VII

Table
Table

Table
Table
Table

Summary

.....................•....•....•..•.

,...............................................................

Circuit

Installation

Description _. . •. . . • . . . .•.. . . . . . . . . . . . . . . . . . . . .•...•. • . . .

..............................•.....•...•.•....•...•......•...•....•.....•...

Operation and Description of Controls .

Maintenance

Alignment

ConversionofTable

I-Tube

2-Tube

3-RF
4-Approx.
5-Parts

.............................................•........•......•.•.............

Mode! Receiver

Socket Voltages

Socket Terminal

and

HF

Oscillator Alignment Frequencies. . . . . . . . . . . . . . . . . . . . . . . . . . • . • . . . . . . . . . . • . .

Signal InputsatIF

List

...........................................•........•.....................

.....................................•....•...

Resistances.~

, . • . . . . . . •. . . . . . . . . . • . . . • . . . . . . . . . . . . . .

. .

for

Rack

Mounting,

.........................•...........................

and

AF

Stages.............................................

.•.

. . . . . . . ..•. . . . . . 6

, .

, .

..

Page

-+

3

8

8

9
l1
l6

lO

II

13

13

l7

figure

Figure 1

Figure l

Figure 4

Figure 5
Figurc

Figure

Figure 8

Figure 9
Figure 10
Fie-ure

Figure
Figure

It
12

13

ILLUSTRATIONS

Front

View

of Receiver SP·600·JX,incabinet
Block Diagram
LocationofTubes
Audio

and

Selectivity Curves
Rear

6

7

ViewofReceiver. . .. . . . . . •. . . . . . . . . . . •. . . . . . • . •. . . . . . • . •. . . . . . . .• . •. . . . . . . . . .

Top

ViewofReceiver..................................

Top

ViewofReceiver-Ca.pacitor
Bottom
Bottom

Circuit DiagramofReceiver. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . •. . . . • . . . . . . . . • . . . .

Connection
Connection

ViewofReceiver

ViewofReceiver-Tuning

........................................•...•............••..........

and

Adjustments........

Overall Fidelity

........................................•.•....•.•.•..............

Diagram-Receiver

Diagram-Tuning

Curves.....................................................

Shield

SP·6(X)·JX..................................................

Unit

Chassis

Unit

.........•...•........•....•........•............

.......................•...•....•..........

•...•...............•...•....

Removed.

Shield

. . . . . . . . .... . . . .... . . . .•...

Removed.................................

..

. . . . . . . . . . .

•..

. . . . .

2

7

l-i-

14

15

20
21
22
23
2-i­25

17

.

29

Figure

Connection

14

Diagram-Frequency

Control

Unit...........................................

3

3L

GENERAL

PURPOSE

COMMUNICATIONS

RECEIVER

MODEL

TECHNICAL SUMMARY

Electrical Charaderistics

Frequency Range--total 6 bands

Band 1

B.nd2.............................•...................•....•.•..............

Band3•........•.....•..•..•..•.••.....•..•......•...•....•........•....•....

Band

Band 5

Band 6

Maximum Undistorted
Output

Phone jack-winding; delivers

600

.....................................•................•.....••.••..•...

.oj.

•••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••

...•....................•.........•.....•...•....•..•.•......•......•..

................................................................•......

Output-approximate-2.5

Impedance-600

ohm

power loadisadjustedto500 milliwatts.

ohms-bOlla-need

Power Supply Requirements

Line

Rating..........................

Power

Consumption..................................

......•....•.•.•....•....•...•....•..................

watts.

split windings.

15

milliwattstoan 8000 ohm resistive load, when

9$, 105, 117. 130,

SP-600-JX

190,210.234

130 watts, 1.25 amps.at117 voltr-maximum.

.54to'4.0

.5"to1.35

1.35to3."5

3."5 to 7."0

7."0 to 1".8

14.80to29.7

29.70to5".0

the

audio outputtothe

and 260 volt taps, 50-60 cycles.

me

me
me
me

me

me
me

Tube

Complement-total

RF,

IF

and

BFa

·Amplificrll _

HF, 2nd
Crystal Controlled

Mixers.

Detector,
AF
Power

Rectifier. ••. . . •. . . . . . . . . . . . . . . . • . . • . . . . .• . . . . . . . . . . . •. . . . . . . . . • . ••. . . . • . • . . . . . . ..•1- 5R"GY

Voltage Regulator

Conversion and

HF

Oscillator. . . . . . . . . . . . . . . . . . . • . .. . . . . . . . . .. . . •. . . . •. . . . . . •. . ...1- 6AC7

. . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . • . . . . . . . . . . . . . . .

"C"

Bias Rectifier and Noise LimiterfTMeter

Amplifier and

Output

IF

Output

.................................•......•.....•.........•......•.....

.............•.............................•.....................

20

.....•...................................

BFa

Oscillators

....................................•....•..............

........................................•.....

Rectifier

...................•.....

7 - 6BA6
3-

..

2 - 6BE6

3- 6ALS
1- 12AU7
1-6V6GT

1-

Mechanical Specifications

Rack

Model-Dimensions;
surface.
Table

Weight66Ibs_

Model-Dimensions;

Performance Data- (approximate values-taken on a sample receiver)

Sensitivity is
of10to

Image rejection ratios are
TheIFrejection ratioat600 kcis2700 to 1
The

AVC

200,000 microvolts.

2.3

microvolts.orbetter, throughout

l.

action will maintain the

19

inches wide,

2Iti

inches wide.

better

than 80 db throughout the frequency range.

output

1O~

inches high and

12~

inches high and

the

entire frequency

constant within

12

16~

nnge,

db when

inchell deep from

17;4

inches deep.

for a signaltonoise power

the

input is increased from 2

Weight

nck

6C4

oAz

mounting

87}1lbs.

ntio

to

GENERAL

PURPOSE

COMMUNICATIONS

GENERAL DESCRIPTION

The

SP-6Q(}]X

R~cciW'r

suffix in

is made in ilc:urmnce with

the exceptionofthe
tors

"..lues

ferred

with

this

where

spectal design considerations require special

cnd

~lue

permit their use.
equalorsuperior to

The

receiver is supplied in either a well ventilated

sted.

table model cabinet finished in dark greytocom-

plement

the

in a standard 19 inch relay rack.

The

self contained power supplyisdesigned for
operation from a single phase. 50to60 cycle alternat­ing

current

primary is provided with tilps coveringa.line voltage

range

from 90to270

is

t

10

watts..

The

receiver is suitlble for either headphone or loud
spulc.e:r rttepcion
graph

or

AM

The

standard

OVtt

a frequency range from 0.S4 to 54.0

in six bands.

control knob,
frequency band
a small front pane! window indicates
hnd

in U$C. This control

indicator with the proper dial scale.

In

addition to

has an arbitrary scale which in conjunction with the
b;md spread dial provides continuous band spread
scales over each frequency
tate logging and tesetability.

The

single tuning control is large andofspecial de­aigntopermit m;lximum
ceptional operating ease.Itcontrols both

and

band

spread dials. An anti-backlash

provides extremely close calibration accuracy
pletely accurate resetability. A tuning
pll-'itive locking a.ction without alfecting the frequency

setting.

The

tuning ratio from the tuning control to

main dial is50to 1 and the n.tio from the

d~1

to the main

An

ingeniously designed rotary turretisemployed
to change bands
the

RF

amplifier. Mixer and First Heterodyne

isil20 tube Radio Communications

self

contained

modd

number &noUS

useofa few capacitOR

tolerances not included in

lists

or

where space limitatiOn! do not

The

special componentssoused are

the

powu

supply.

that

JAN

speci6carions. with

the

JAN

componentsinquality.

this

The

rtteiver

,lind

JAN

resis-

lighter grey front panel or for mounting

power source.

of

AM

MCW

The
on

telegraph signals.

modd

large

the front panel, selects

and

a hand indicator visible through

the

frequency scalu, the main dial

did

is 6

andtoplace

The

pov.·u tran.s(ormer

","Olts.

The

fIO'NU

radio telr:phone,

CQnNmprion

CW

provides continuous CQvcnge

megacyd~

QSI1y

operated

also

aligns the dial frequency

band

for extremely accu-

tr.lV1!:l'Se

to

apeed

1.

the

band

change

the

desired

the

frcqucm;:y

ill

weU:uex-

the

gen

and

lock

provides

band

sprud

coil assemblies

main
tnin
com'

tde'

Qscil-

]X

pre-

the

o(

RECEIVER

lator

sta.ges
tionsofthe four gang tuning capacitor and
spective
high signal to

Two

arr:

provided on ..II bands.

vemon, used on frequenciesupto
cludes a mixer, heterodyne o.sciHator, four stages

IF

amplification, detector and
limiter and meter rectifier. heat frequency oscillator,
beat frequency buffer amplifier, IF output,
ner

and
conversion, employed
cycles, includes a second mixer and a second hetero­dyne crystal controlled OKilIator.

system includes
a voltage rtgub.ror.

The

nel

crytta.l

chO!Cn
controls permit the

ity

continuously

selened fixed frequency

bed.

channel
dioaltothe
qumcy

trol.

No
desirable, when llwitching from
tion for

not

aupplied with

chased

MFG.

it

istofunction.
The

relative strengthofthe

microvolt. when operated on
Rain

controlatmaximum. 1\ rear control is provided

for adjustment~tthe

RF

signal

panel meter

cat£l1

the

wan

..

the0db

The
constants for
quency oscillatot employs a
cuit which gives a high order of frequency stability
and minimizes oscillator harmonics.
quencY oscillator voltageisintroduced into
teetQr throukh a bulfcr ampliner which eliminates
OKillator lock-in.
tune $ignais sharply to

diucrly

adjacent

to

their

respecti

....

e

.sec-

their

tuba.

stag..."

output

frequency control

within

This

noise.

assuIe5

ratio.

maximum sensitivity

of tuned r.\din frequency amplification

The

circuit (or single con-

7.4

megacycles., in-

AVe

tl:ctifier, noise

AF

power

~

controlled

the n.ngeofthe

stage.

for

The

circuit

for

frequencies above 7.4 mega-

The

power supply

B power rectifier, C bias rectifier and

Wlit

Open.tK)fl

provides

on any six frequencir:s

receiver.

(or

bed

front

ampli-

double.

chM!-

panel

wectionofthe normal high stabil-

vuiable

opention

signd

frequl:IlCY,

desired and

retWlingofthe

the

same signal frequency.

on

special

CO.

specifying

two

scale tuning meter normally indicates the

input

of

10

SWItch

audio

output

nming or eitherofthe

signak

it

tune

widt

the

recaver,

order

the

rectived signal in

plus20db

micro'l/Olu.

For crystal controlled

is only

5wilCb

necesstry

to the cry5Ul

to

.5rt

fn·

the delta frequency con-

mJ.in

tuning is nr:cessary or

VFQ

to

crystal open.-

Theae

crystals are

bur

from

HAMMARLUND

aMuld

be

pur'

signal frequency for which

db

from 1

Ave

and with the

scale

mding

On

depressionofthe

with

the lower scaleofthe metee indi-

pawn

level indbfrom 6 mllli-

A rear control is provided (oe adjustment of

reading.

Ave

drcuir

ON

is provided with $Cpan.te rime

and

MeW

operation.

high

capacity Colpitts cir-

The

The

beat

fo::'

beat fre-

the

This

feature makes it possible to

:ero

beat and

~mits

the

re-

of

six

the

RF

an

tk-

in-

at

5

c:hwonofthe
Iator injection

panel control nrielll

to plusorminw

The

noise limiter

ference. from ignition systems

type

noi.sc.

the

limiter.

The

antenm

a balanced

100 ohms_

conventional single

The

audio

lmdorline and is provided

windiog

power
phone circuit
vides

the

trolofsensitivityinthe

outputisapproximately

aignds

600

An

RF gain control is provided

rear

c:ontrol

to

suit operating conditions. A froot

the

a.udio

J :Ke.

circuit

The

limiter switch permits optional

input

circuitisdesigned

line.

The

input

The

nceiver

output

for

bclanced

....

hen

attenuated approximateh'

ohm

power output.

may

wire

antenna_

circuitisdesigned for a

10.1I.J

referredtoan 8000

presenceofstrong signals and

for

adjuacing

beat

effectively limits

Of'

other.sourasofpulse

impecance is nominally

also

the

beat

oacil-

frequency from 0

the

intu-

UK

for

use with

be

operated

with

of

operatesoneither

The

but

leavelll
tion between transmission periods. A
provides

Radiation is negligible and oomplics with

mttIts

install.ttions.

Frequmcy

nnga

a

quency depending

very unusual

600

with

a four terminal split

opt:r",tioll. UnJill.torted

'2.S

watu.

for

ohm

tS

the

manual con-

The

load

db below

ohm

head

pr0-

tuned

_;lily.

The

crysta(

ra.nging

crystal. niter embodies

have proved10effective
Super
mechanical design.

II

CIRCUIT DESCRIPTION

MANUAL

send

nceive

the

for

the

for

shipboard operation and for mu[ti-ccceivn:

drift

between

degru

HP

o.sciUa.tors

selectivity control provides th.r« degrees
and

three

ftom

shup

Pro

Receivers, incorporated in

switch desensiti:es

power

ontoprovide for

connectionofan

Uter a

.001 percent

011

fu

of

frequency stability

and

degrees

(.'2kc) to broad (13.:KC).

the

or

Aye.

the

in~nt

reu

external rd;ay.

l.S

minute warlnupperiod,

and

.01 pc.rcentoffre-

frequency wed.

for

closdy

()f

same circuit features

and

approaches crystal

nCJn-crystal selectivity

desira.bleinHammarlund

an

nceiver

Kcepta.de

require'

Thisisa

wriilblc

improved

recep-

of

The

that

Gmoual-

Figure
more

dearly

the

variou.a circuit sttt:iotu.

ou.s

tubesisshowninFigure J.

cmvcnion,

l"CII1aias

First:

Mixer

stagcaofIF

Detector

Beat

F.requency

amplifier

Y-17

and

Power

age

frequencies above
Second
the

Rectifitt

Regulator

In

the

Gate

Input Coupling-

to

provide

miaaion line. A balanced doubletorstraight

tenna

maybe

RF

AmpIi£e.r

turret

is employed

cciI.

&MCmblic.aofthe

V·ji

and
rectly adjacent
gang

tuning

a..ssutt5

nbo.

rani

The

rotary

The

circutt

II.

A bloc:k diagram, Figure 2, is provided

!how

the

uaed

for

of

two

ata~e:s

V-S, Fira:

amplification V-7.

and

Ave

ltttiiiu

Osc:il.latol"

V-l6-A

the

circuit

Heterodyne

tube

optimum coupling from a 100

;and V-I6-B.

Powel"

Y-19, e Bias Rectifier V-20

V-IS.

for

7.1-

V-7.

I.

.hewn KhelJliltic:aUy

arra.nRCmcnt and

The

locationofthe

The

circuit, for

~

frequenciet

of

RF

am.pJ.mcation

Hctuodyne

V·9,
V-H,
V-B.

Output

Supply

double conversion, used for signal

Oscillator V-8are substituted for

The

systcm which includcs B

me.

the

Second

antenna. coupling is designed

upto7."

OaC:illatOI"V-...

V-tO ilnd V-11.

Noise Limiter

IF

output

Mixer

UICd.

-

An

Pint

Heterodyne

to

capacitor

m.uimum

Hdnudyne

turTd:

in~ou!Iy

to

change

RP

their

respective sectionsofthe

and

sensitivityathigh

bands

I.!Il.plifiu

Osollacor

their

O$CiIWor-(VaMble

band

change switch, advanced de·

designed

and to place

V'I

and V-'2, Mixer

V-"

ttSpeetive tubes.

signal to

function.

V-I

Powel" stage

,m~le

and

V-IS.

;and

and

Volt-

V-6

ohm

tnns-

wire

rotary

stages di-

noi.sc

V-4)-

in

to

of

vui-

mc

V-2,

four

AF

and

In-

the

four

This

signofthe
capacitor and

vide

irequency

to;apreviowly

p;".

VoJ) -

frequency operation, a

quency oscillator
variable
of

m:

trol.

A second front panel control permits ;adjustment

of

the

.ooji

percent

Intennediate
sion to
low 7.4 mc.
incorporatini"
circuit. Six positionsofselectivity provide 6 db
widthsof.'2.,
rower

ention.

selectivity for

intctferinC

Double

ciu

above

mebythe

V·"orV-]

signal is

Miur

Osc:ilbtor V-S, foe aelectivity.

Dcucto.-

high. level

cuit

is provided

and

MCW

four

gang,

twin

aection, variable

rugjte.d

a:a.bility

wuttained

H

..

....tyn.

Por

aervicell requiring extremely stablc,

to

tty5ta1 controned oscillator, with a choict;

crystal. positionll, is

crystal oscillator frequency over a

range.

Frequency Amplifier - Single conver-

HS

kcisemployed for signal frequencies

There

the

.',

bandwidth

The

crystal phasing control provides extreme

the

construction

~d

dw

degree.

00ciIIa,,,,

crystal.

is provided..

are

HammarlWld

1.3, 8

positionll,
high

Instant

effaud

four

stage.s

and13kc:.

the

attenuationofdOKly

throughout,

calihnrion

- (C.,...a

controlled

changeover from

byafrant

plworminus

ofIfamplification

patented

On

the.thne

crystal filter isinop-

signitls.

convusion

7."

Pint

then

V-6

Deta:tor

me.

for

heterodyned

and

and

is employed

The

signa.!

Mixer

Y-S

and

high

image

to

the

J.S mc Fixed Crystal Controlled

Ave

-1bc

;and

Ave

with

separate time constants for

for

signal frequen-

is heterodyned

Heterodyne

ttjcction.

The

"SS kc by

V-

14

tube

Reetifi.er.

The

opention.

:u:cunq

Cantn>ll..J

high

pand

cry.5l:al

OscillatOr

3.955

the

is

wed

AVe

tuning

pro'

fixed.

fre-

coo-

be-

filter

band·

nu'

ildja~nt

to

~.9jiS

mc

Second

as a

cir-

CW

Beat

Fn:i:Juency

OlIciliator employsa high capacity Colpitts

gives a

rncillator harmonics.

V'l3.

fer

and permits variation of the beat oscillator injection

meansofa control located on
A front Panel control varies

from .tero beat to plusorminus 3 kc.

limits

other sourcesofpulse type noise. A separate control

high

is coupled into

Amplinel'

Noise

Limiter-

the

noise interference from

orderoffrequency stability

'\[7

- " " "

SBAS

" "

Oscillator-The

the

V.12,

which

The

.'"

CRY5TA.l.

beat

ffequency

circuit

and

minimizes

The

beat frequency Oscillator

detector circuit through Buf-

eliminates

the

noise limiter circuit V·15,

'FO

"

'"

1

MIXER

,

...

,"0

"

6OG7

CONTIIOUEO

05Cillator

the

rearofthe

audio beat frequency,

iR'nition

'FO

"

systems

""

irIllXER

"

"

,m

''''

..

".

-.~

"';."~

!

.'

,

,~ ~/

<"@.,.

, " ,

which

lad-in

ch~sis.

...

;

'FAMP

""

0

by

or

V9

Power Supply ­partofthe
and

the

low

pass

power transformer is provided with screw terminal

primary

90

to

former

Tuning

operation to indicate
relative strength

Meter Switch converts

of output level in db from

'"

'"

'"

,~

IFAMP

''''

receiver.

C rectifier Y-20,

filters and

taps,

270 volts, 50 to

is

protectedbya fuse in

Meter-The

BUFFER

'"

''''

'"

DRIveR

~

""

Vi6A

IFOUT

12AU7

IF

OOTPUT

The

power

It

includes

to~ether

the

Yoltage Regulator Y-18.

covering a power line source range of

60

tuning meter is used on

the

of

received signals. Depressionofthe

the

l,Iupply

cycles.

the

accuracyoftuning and the

meter circuit for indication

6 milliwatts.

is an intelitral

the

B rectmer Y-19

with their respective

The

The

power trans-

primary circuit.

Aye

'M'

'"

..."

Vi

....

OET

...

AFAMP

""

12AU7

"

Vl~A

LIMITER

GAL5

"'n>oT

6V6GT

.Em<

LEVEL

'"

"

""

~"

METER

""""

-<

''0

eRECT

~"

'SLOCK DIAGRAM'

FIG. 2

switch 8-6, permits optional useofthe limiter on
mode

of

operation when pulse type interference is

present.

Audio Fre<juency Amplifier - A resistance coupled

amplifier triode Y-16-B, amplifies
signal from the detector.

Audio

transformer coupled through a split, balanced wind'ng

to
load.
the direct curreht in the output circuit,
teletypeorsimilar

ing providell attenuated audio signal output for head-

phone
of
the 600
wattstoa

IF

a low impedance source of intermediate frequency

(455 Kc) signal to the connectoronthe rear skirt

the chassis.

Output-The

deliver 2.5 watts undi.storted output

The

split balanced winding permits balancing of

.service.

operation.

15

milliwatts into an 8000 ohm resistive load when

ohm

600

Output

This

power secondaryisdelivering 500

ohm resistive load.

- A cathode follower V-16-A provides

audio output tube Y

A separate secondary wind-

winding will deliver an output

the

audio frequency

to

a 600

as

<LIly

-17,

ohm

used for

milli-

of

".

B REeT

5R4GY

RF Gain Control and Power Switch ­g;lin controlisprovided for manual controlofIlenm­tivitytoprevent overloading on strong signals when
operatin,l?;
"MANUAL"
when

the

"ON

-OFF" switch is operated at

extremityoftheRFgain control.

is

Send·Receive Switch­sensitizes

provide for instant reception between transmission
periods.
receiver for

Convenience

is provided on the
tion

of

an accessory such as a lamporelectric clock.

Radiation - Advanced design and shieldingofthe

high frequency, second conversion crystal and beat

frequency

negligible point
common in multi-receiver installations,

a minimum.

---Si9nal

••

_._

•••• Signal

-----

with

the

Aye-MANUAL

position. This control also operates

switch

the

A receptacle is proVided on the rea.rofthe

is

in

receiver

the

external connectionofa relay.

Ourlee

rearofthe chassis for

OlIciliators

so

that

pafIl

_ to all

pafIll'or

frequMl:in

•

••

the

"Ave"

The

send-receive switch

but

leaves

- A convenience power outlet

'has reduced radiation to a

interference of this nature,

•

position.

the

counter-c1ockwi~e

the

"-..,;"

a~

'I'.4me

"/oW

'1'."

The

switch in the

The

Powt:r

power·

the

is

reduced

"on"

connec-

me:

RF

de-

to

to

7

III

INSTALLATION

Tubes

aD
any packing is removed (rom

Power Supply - Malee

Iud

u'ul.fOfmc("

to60cycle power

Anrtnna-The

and

Packing-Inspect

tubes are 6rmlyintheir

on

the

power

tap

tnns(onner

which

source

rnO$t

input

the

cha..uistoace

rupective

the

~e

nearly

voltage.

sockets and

recrivu.

that

the pritnary

is connected

agrees

with

to
the

impedance at the antenna

tbt

that

tap

the

SO

terminals is designed to match a 100 ohm transmission
lme:.

The

angle plug adapter and connector, supplied

with

the

receiver,isdesigned for use with a small

meter,

be:

desired

tenna lead-in wire shouldbeconnectedtoone

of

CMnected from

"TWINAX"

wed

with

a balanced antenna installation.

to

operate

the

connector plug and a ground lead should

transmission line, which should

with

the

a !ingle

other

win:

antenna,

terminalofthe

dia-

If

it

the

m'

terminal

~

connector

OPERATION

DESCRIPTION OF CONTROLS

The

front panel dials and controls are shown in
Figure 1 and
ala

are shown

Tuning

~d

~prQd

frtquency band acales, calihn.tedinmega.c.ydea
a.rbitrary, outer
bitrary,

pointerofthe main dial indicates

lutioN

at

any setting.
scale,ofthe
the band spread dial
for this
bUllJ

spread sy:;tem dividt3

dial

over

bilnd spread

firm

points. Slnce

sions,

on

quUlCY
ting&.
ltaticns..

CryNI

on

b:ed
CONTROL"
plied with

order.
frequency operation crystal
from HAMMARLUNO MFG. CO. INC. and
order should specify
each

unit

has provision for

the

rear

DiaI.s

dial is

in

-

Figure

The

to

chauis

the right.

skirt c:ontrolaand tennin-

6.

main dial

is

The

to

!M

mUn

left and the

dial haa aix

and an

scale.

The

0to100,

that

sc:a.Ie.

have been made by

Thus.ifthe

main dial indicates

band spread dial

The

indic:a.tea

numeral under the

the

the

painttl', for

over

87.6,

the

hu

an

number

band

of

sprad

the

rev0-

aliter

the 6.gure 4 and

reading to log

setting is read, 487.6. This precise mechanical

the

rotationofthe

each frequency band into approximately 600

divisions, with one half diviaion calibra-

itiscurtoestimate one tenth divi-

the

band

apre:ad sale., this divides each fn:·

band

into

apprcWm.:t.tdy 6000 readable set·

This prrmits extreme accuracy in

Control1ed

frequrncy channels

is provilUd.

the

receivu,

In

order

to

Hf

i~

o.dIIator

the

The

crysU..lJ

but

will

be

correct crystal controlled

uniu

the

&i~

frequency, for which

is to be used.

six crystals. Variable frequency op-

The

frequency control unit

the

logging

- Por operation

"fREQUENCY

are not:

supplied on ,pecial

should be

or&red

ar-

find

dial

main

1Up-

the

of

l5

plug to
antttuu.

the

Speakn

ground

input

R:\:epcadeatthe

-

The

tuminal,

whichisadjacenttothe

rearofthe tuning unit.

loud speaker mouldbeof
manent magnet dynamic type and
speaker voice
former for connectiontothe

COilto600

ohm

line matching

600

terminalsofthe receiver.

-

Headphones

phone"

may be used in

Either

pedilnce type is recommended.
ciUedatthe

Mounting -

or

mountw

is purchased,
cahinet

the

free access of

fower left side of

The

in a standard 19 inch

it

is SlJpplied with a steel cabinet.

ahould

he placed in a position

air

loworhigh imI:edance head-

the

phone jack.

The

the

front panel.

receiver maybeplaced on a

rack...

for

the

vcntibtion louvers.

IV

or

eration
any of
"CRYSTAL

agned

in

the rangeofthe

"DELTA

very small plus

""..a.

The
tion ahould
screw on topofthe cryaul unit
spring aSKmblytothe
stals in
retainer spring assembly forward so that
press
thumb

each
chart provided for this

switeh. Pencil

if

it is

numerals on
agree

which an:

main tuning

for which

$Aould

numba
Delta Frequency control shouldbeadjusted for
mum siRnalorfor
noted
quency cootrol must be made each time
nal frequencyU!changed and
should

crysu.l contrOlled frequency operation on

the

six crystal positions is selected by the

for use

fREQ"

SWITCH".

with

rtteiver

control is

or

The

crystal osdllatorisde·

suitable crystalsatany frequency

Wove one megacycle.

wedtocompensate for a

minw

frequency tolerance of

procedure for cry6tal frequency control opera-

be

:as

follows; l.oo&en

the

and

rear. Insert

the

crystal sockets, numbered 1to6.

on top of

screw. Mark

the

crystal holders and t\tthten the
the

signal frequency for which

crystal was selected. in megacyclesonthe plastic

pwpose illongside

or

ink may

dc.siced

with

to change

the

chart

the

numerals on the

a.1ao

indicated

dial

shouldbeletatthe

operation is

be.

set

at

the

for

that signal frequency on the chart.

tero

that

this tuning adjustmentofthe Delta Fre-

be

settoagree with

be

wed and can

theK

ligures

ahouJd

be

c:ryst:a.l

by

the

crystal switch.

desired.

The

position corresponding

beatasrequired.It!hould he

that

the

the

new signal frequency.

the

per-

should include a

mns-

ohm <ludic output

The

high

im-

phone jack is

If

a table

lo-

~ble

model

The

which

permits

The

the

knl.l1'led

push

the

crystalorcry-

the

thumb

retainer

Bring the

the

springs

the

crystal

be

era..sed

at

any time.

usedtothil.t

aoc:ket

The

they

positionJ.,

The

sign.aI

frequency

crystal

swrtm

to

the

The

maxi-

that

the

:;ig-

main tuning dial

Tuning
rightofthe
for

the
quency
shiftingofthe
under a severe condition of vibration.

Tuning

left on
signal and provides an indication of the
strengthofthe received
The
chassis provides adjustment
on

theRFscale, with a 10 microvolt input signal. De-

pression

meter circuit for indication of

level

returnedtothe RF scale circuit position when released

and

the audio

put, by

abserve

meter.
the
the
put
6

milliwatts or 1.9 volts across a 600 ohm load.

Band Change -

band change controL Each revolution of this control

turns
coil, trimmer and switch contact assemblies, from one
frequency band to
and may be turned in either direction
tive detent machanism assures correct locationofthe
\'anous bands.
ously
at

tht:: ct:nter uf

indicator

SelectivitySwitch -

three crystal and
tivity, ranging from extremely sharp, for C'W recep­tion,
control knob dial indicates

Lock-The

tuning knob, provides a positive locking

tuning mechanism without affecting

setting, whenitis desiredtoprevent accidental

tunin~·or

Meter-

the

front panel is usefulinaccurately tuning a

"METER

in db

should not be

meansofheadphonesorspeaker. Failure
this precaution

The
chassis provides adjustmentofthe
AF

scale, which shouldbemade when

power from

the

operates

to

broad for good fidelity Mewoperation.

AD]

of

the

"METER

from

output

turret, containing

with

bas been adjusted for low power out-

"METER

the

The

the

the

the

tuning lock, located to

when

the

receiver is operated

The

tuning meteratthe

si~nal

in db from 1 microvolt.

RP" control at the rearofthe

of

the

plus 20 db reading

SWITCH"

the

6 miljiwilttll.

depTe8lied

fUy

AD]

600 ohm audio output terminals is

The

large knob,tothe

the

next.

band change control simulta.ne-

small frequency

panel

proper

The

three

Thill

for

re.<"\1ltindamagetothe

AF"

control at

the

RF

The

anJ

.uign" the Jial frequency

f\C3.le.

selectivity switch provides

non-crystal degreesofselec-

the

6 db band widthateach

converts

AF

output power

IIwitch is Ilpnng

the

AF

scale unless

the

0 db reading on

the

left, is

and

HF

turret has no stops

desired. A

ba.nd

dial, loca.ted

the

the

fre·

upper

relative

the

rear of

AF

out-

the

oscilla.tor

posi-

The

setting.

Phasing Control -

high attenuation

ence on either sideofthe signal frequency, when

crystal selectivity positions are used.

Beat Frequency Oscillator -

o.scillator is turned

the

"MOD-CW"

The

phasing control permits

of

closely adjacent channel interfer'

The

beat frequency

"on"

for C'W signal operation by

switch.

The

beat frequency dial

the

to

should
adjusted to
quency oscillator injection voltage is adjustablebythe

"BFO

pendentofother controls andisusefulingready at­tenuating
pulse type sources, regardless
tion.

desensitizing
to prevent damage to
proximity

turn

rearofthe
send-receive switch and provides for the connectiorr of

an

receive

permits the choice
which insures maximum

strength,
justed

ing.

siredtouse
signal strength,

be set at

INj"

Noise Limiter-

Send-Receive-

to reception between transmission periods.

Rday

receive

AVC-Manual Switch

ity operationasdesired.

RF

adjustment
tion, in order that

on
to reduce undesirable noise during "ojf" periods in the
transmissionofthe

mum.

Justs

should be adjusted for the required audio

operating on
when operating on

df

quency

provided on
ing an accessory, suchasan electric clockorlamp.

Receptacle -

externally connected relay, to perform

operation.

switchisleft in

Gain

to

suit

This

AVe,inorder

Audio

the

Phono

the

receiver for phonographorother
source input to

Convenience

xero

for tuning-to.u:ro

~ve

the

desired audio pitch.

control on

noLse

interference from ignition

the receiver during transmission periods,

to

the

receiver, is connected in parallel with the

Control­of

the

when

under

the signal strength and prevent overload-

control is also in the circuit when operating

the

tuning- meter for indicationofrelative

the

Gain

Control-

audio

input

AVC

Input-Terminals

Ouder

the rear of

the

rear skirtofthe

The

noise limiter switch is inde-

of

The

send-receive switch permits

the

receiver, when operated in

transmitter and provides instant

The

relay receptacle, on the

When

of

the

that

RF gain control should beatmaxi-

and is best leftator

the relayisused

the

"open" or "send" position.

~

The AVC-Manual Switch

either

AVCorMa.nual sensitiv-

TheAVC

sensitivity for weak "ignab.

The

RF

gain control provides

sensitivity for signals

the

"manual" operating condi-

receiver sensitivity may be ad-

the

sensitivity may be adjusted

received signal.

The

audio gain control ad-

to the audio amplifier tube.

MANUAL

the

- A power outlet receptacle is
the

control.

are provided on

audio frequency amplifier.

receiver chassis for operat-

beat and then

The

chassis.

or

the

modeofopera-

the
the

has a delay bias,

of

\Vhenitis

output

near maximum

audio fre-

beat fre-

similar

send­send-

various

when

the

rear

re_

de-

It

MAINTENANCE

This

receiverisdesigned for continuous duty and
should normally require little attention beyond
replacement
velop
socket voltages and resistances should be measured
chassis.
shown in tables I and:2will genenlly indicate the

of

tubes. However,

that

cannot be eliminated with new tubes,

Any

a.ppreciable departure from

lShould

trouble de-

the

the
the

to

values

"

V

componentorcircuit at fault.

Operating- and maintenanceofthe receiver will
greatly facilitated if
manual are thoroughly digested. Approximate input

signal values for stage by stage gain checks are shown
in table

4.

the

contents of this instruction

be

TUBE

SOCKET

VOLTAGES-TABLE 1

Vol~e

utt:rUk

above 10 voltls

control at minimum and

TUB! I 1

V·I

V·I '-Sol
V·,

V·,
V·l
V·l

V·l
V·l
V·.
V·,
V·.
V·.

V.,
V·,

V·,

V.,

V·,

V.,
V·.

V.,

V·,

V·,

V·IO

V·IO

V-II

V·II

V.12

V·U
V·U
V·l

V•

.,

V·16
V·I6
V·17

V'17

V·II

V'19

V·19
V·10
V·l0

..

were

'-I

'-I

'-H

Ila

--11

$-11
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to

made.

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with Musurements Corp. Model

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f6.hc:

'6.3.c:

-

,.,

-

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Mcuuremenu

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CW-MOD

l

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'6.h.c

·6.3ac;, -

'6.bc

-

-

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'6.1i1c -

·6.)ac

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$6.31.c
$6.31.c

$6.hc
$6.1ac
$6.3«

$6.3«

$6.3a.c.

$6.be

$6.3i11c

$6.3Ic

$6.3i11c

$6.3.."

$6.3ac

$6.11"
$6.hc
$6.3i11£

u

1.'

'60

'80

- - 13a

- -

- -

$6.3ac

-6.3ac

made

with

Weston

62

for

voltap

switch

•

100

-

'60

-

210

-

'60

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-

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'60

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below

"ew-

SOCKET

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-

-

-

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-

- -

-

-

-

-

-

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-

Mood 661

VTVM.

10

volts. Line

NUMBERS

The

,

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-

- -

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-

a

- - -

-

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'-I

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-

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- -

-

-

-

- -

...

,

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12 - RF Gain

1l

-

'00

31.

-

Voh'()hmmetu,

500 volt scale was used

voluge

117,

,

-

-

-

-

-

-

-

-

-

-

- RP

-

-

- RP Gain

- RF Cain

-

-

-

-

-

-

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-

--

-

-

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$6.3Ic

-

-

-

-

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RP

RP Cain ",jn.
RF Gain

RF Gain

RI' Gain
RP GJin mu...----CrysuI
RF Gain

R.P

RF Cain

ItP

RF

RP Gain

RF,Cain

RP Oil;"

RP Gain 1Ilia.-Prfll&.
Prcqucnae. bel
Frequendu

RP
RP

RP

Rf
RP Gain
RP Cain
RoP
RF Gain
RP Cain
RF

Rf' Gaill
RF

R.P

RF Cain

RP Gain

RP

RF
RP Cain min.

acept

no

ligna!

MODE

Cain

mu.

lUX.

aiD.

mu..-VFO

!I.in.-Vl'O

Gain

min.-Cr,.stal

lUI.

Cain

au.ormin.

Gain

Ru.-Freq
nin.-Fer-qs.

Gun

1IU.x.-FnQ.s. above

min.-Freqs.

muc.-Preqa.
min.-Freqa.

1IIu.-Freqa.

above ' ...

G~in

DI.L

Gain

Jnin.

Cain

mas

.

miOl.

elin

mu.

lJIin.
mo.-BFG

Gain

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mall:.

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Ow

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CllU.

Cw

min.

laU.

Gain miD.

mu:.

mu.-$)

Gain

mln.--'

Cain max.

thoae indicated by

for

all

Of

or

Of.

(If

or

input.

min.

......

min.

min.

min.

Audio

OPERATION

operation

Puq.

oJl4'~tion

flreq.

•. below 7...
btlow 7."me:

abo"" 7."me

below '."mo;

htlow 7."mc

above 7."mc

aho~

?"me

mc

Tnj"e:tion

Injection mn:.

V.Ie Pin 2toPin"
Va.c Pin

voltages

Control

Coouol

me

7."me

7.4mc

mn.

210

Pin 8

G~

JO

TUBE

SOCKET TERMINAL

RESISTANCE-TABLE

Resistance to chassis. Measurements made with Weston Model 663 Volt-Ohmmeter.
Tube

removed from socket under measurement. Audio Gain Controlatmaximum. RF Gain Control at mini-

mum.

Limiter

Switch "OFF', CW·MOD Switch on "CW".

AVe-MAN

Switchon"AVe".

2

SQcket

Pin

No.

Tube

Socket

V-I
V_,

V-3

V-'

V-'
V-l
V-6

V-6
V-7

V-7
V_,

2 3

l.8M

l.8M

0 0

Inf. Inf. 0 Inf.

<OK

"K
21K

21K

llsK

llSK 0

0 0

0

lnf. 0

130 0

0 0

0 0

0 0

0

"K

0

0

,

<OK

<OK

0

In£.

<OK
<6K

<6K
<6K

<6K

Inl.

6 7

80K

80K

<6K

"K

"K

13K

Inf.

10K

InE.

80K

21K

0

0

0

0

'OOK

lOOK

lOOK

0

0

a

, ,

'6K

MODE OF OPERATION

Crysb.l Freq. control pos.

Crystal Freq. control

VFO

Operation

Frcq. Bands below

Frcq. Bands above

Frcq. Bands above 7.4mc

Frcq. Bands below

Frcq. Bandt below 7.4me

pos.

'.4me

'."me

7.4me

t-<i

1-6

V-'

V-'

V·1O

V·1l

V·12

Y·13

V-I-4-

V·I'

V-16

V-17

V-18

V·19

V·20

UM

I.3M 0 0

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0

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0 0

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K Inf.

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<6K
6lK 0

IK

<6K

0

lSOK

0

0

0 19SK

0

0

0 0

<6K

.70K Inf.

l5

52K

52K

<OK

<OK

16K

In£.

78K

SOK

21K

80K

80K

lOK

HSK

lOOK

0 220K

0

<6K

l5

0 6lK

a

0

a

0

•

a

nOK

"70K

0

680

360

<6K

Freq. Bands above

·0toIK (BFQ Injection control)

7.4me

/I

VI

ALIGNMENT

'The alignment

ceiver requires
knowledge of

mg a double ruper-heterodyne,

dun

is

~ven

Uncke

ment

Ronnal service

for

extremely long periodsoftime, consequrntly

ofamodem

p~dsion

the

circuiu involved.

more involved

the

communications re-

instruments

than

receiver will stayinalill:n·

and

a thorough

This

receivu,

the

alignment proce-

is

USlal.

be-

ALIGNMENT OF

The

low frequencyIFshouldbealiiflcd

recommended
IF

involves the useofa sweep frequency signal gen-

er.uar

andanoscilloscope. Since these instruments

not avaib.bleatthe
nate

mrthod

crator

and

The additional information

method

for aligning

the

averai:e service stiltion

using an amplitude modulated signal

an

output

meter will

be

ttquired

i1lignment method wiltbecoveredina later

The

signal g£nerator .shouldbecoupledtothe grid

of

the

mixer

tube

VS

th.rough a c:lpilcitance

proximately

be

required 10 milke

.0

I mfd. A miniature tube

the

mixer grid connection avail-

able. Such an ildapter is manufacturedbythe
Manufacturing Co.
nected across

the speaker voice coit.

the

An

output

output

meter shouldbecon-

terminalllofthe

The

receiver controla .mould

nowbeletaIfollow,,:

Control

ScJectivity
Send - Rc:ei

...

-e

CW-Mod

Phasing

AVC-Mm

Audio

Gain

RP Gain

Band Switch.

0;.1

The

signal generator shouldbemodulated 30 per-

centat.400

3 kc position

maximum. Set
kc

and

00

the

of

the

LH,

Ll9,
ducing
control u required

output.

est position,.2Ite.
quency

cycles.

adjust its

output

v:uious

L38, L36

the

signal

Now

for

the

and

the

meter.

:IIlignm~t

tum

muimum

output

Stt

Receive

Mod
Arrow

M",

Set

Stt

US

2.5

Tum

the
advance the
signal generator frequency to

untit some deflectionisnoted

Rdu

and

Ll2

Jiil:enerator

to

prev~t

the

Icleetivity switchtothe

and

.djuat

output.

correct signal frequalCY by the 455
IP amplifier and
should

not

the

frequencyofthe

be disturbed for

Posibon

tat

for

ilpprox..

t<n

-3.45

me

selectivity

mc

RF

to

figure 3

u1justmUits.

for

maximum output. re-

output

U1d

overload

the sillm.l gene-rator fre-

This

lee

the

remainderofthe
frequency IF alignment, unless it shouldbeto recheck
this establishmentofcryltal frequency to make sure
that

the

signal generator frequency

during the alignment.

The

selectivity switchisnow

nrst.

The

low frequency

are

the

alter-

~en

descnbed £rn.
for

the

visual

pangnph.

of

ap-

adapter

will

Alden

receiver

10

volts

switch

to

the

Gain control to

455

for

the

Ioation

Adjust

the

or

establishes
crystal for

L.n.

RF

Gain

excessive

narrow-

the.
the

siKnal R;tnen..tor

low

hou

not drifted

or

realip:nment

pouible
inated.

ment should

should

required readjustment should not

should

awes

ofaputicular

Whenithu

be

be.

aercised

not

be

attemptw.

been

detumined

attempt~

in

ma.king

unle.ss

trouble

lave

that

a great deal

th~

adjmtmenu.
cowl

.1.11

hem elim-

any

realign-

of

caution

mo~

other

as any

than a

5light angular motionofthe adjusting screw.

THE

turnedtothe3kc
L36
Now

IF

STAGES

position

and

L32 are again adjusted for maximum output.

tum

the

selectivity switchtotbe 1.1

and

L42. L41. L39.

Icc

U8.

po!;tion

and adjust L37 for maximum output. Before. chang­ing this

ing the CW-Mod switch
beat with
necessary

check and adjustment of
the

low frequency IF shouldbethe
cr.:pt
amplitudr.:
The
acro"

junctionofR64

the
l«tivity
the signal
L31,

heldtoa very

it

3.5 me

set·up

the BFO should

the

BFO knob diiil

L44

should

be.

be

to

turned

CW

and checked for

at

its

uro

on

by throw-

reading.
adju5ted for zero output.
the

BFO should

be

done with

signal generator carrier unmodulatcd.

Th£

procedure for the visua1 m£thod of aligning

I!ilmeasthe above ex-

that

the adjustments are

and

coincidence

of.

m:llde

for both maximum

the

oscillolcope images.

oscilloscope vertical input should be connected

the

diode detector load resistance. from

and

R65tochassis.

The

high frequencyIfshouldbealigned next. Set

band

switchtothe 7.4 - 14.8 me band.

The

is

LB

3.05

desired

to

switch should

genelOl.tor

and

L34

me

cry5ta1

dose

that

permit

be

in

the3Itc

frequencyto3.955 tnc

for

maximum output.

used in

position. Adjust

the

secood

and

osallator

frequency tolerance. However,

WI

its

oscillator

we

as a frequencY standa.rd,

frequency

be

1;UO

1'h.UI

the

the

The

adjust

exactly

hereinafter described, this may be accomplished by
adjusting capacitor
exact procedure is as follows;
mconthe
by

means of a jumper, the center and the open tennin-

3.45

als on llwitch 54atthe rear of

a two foot length
tuminal
on

switch

a

Now

and

the

3.S me oscillator tube

on

CW

beu

noteisheard in the headphonesorspeaker.

throw

couple a 1.0mcfrequency

put

tenninal.

R'emove
test lead.

the

If

CIOI,

underneath the chusis.

Set

the

receiver

The

to

- 7.4 me band. Temporarily connect,
the

tuning unit. Attach

of

insulated wire to

the

antenna

dress the free end around the tube shield

V8

with

the

CW-Mod

rock

the

tuning control slightly until

the

CW

-Mod

Adjust ca.pacitor

jUlrlper from 54

appreciable adjustmentofCtOI

switch

.!.ta.ndard

ClOI

and

remove

to

Mod

to

the antenn], in-

for

urn

the

two

and

beat.

foot.

was

quireditis advisilble to repeat the high frequency IF
alignment.

The

3.5

me oscill",tor
quency standardatmultiples of
upwards,
tengthofwire

by

temporarily connecting the

<l.S

deacribed above.

mOlY

now

3.5

be

uled

mc from

all

two

a fre-

10.5
foot

If

st.-

is

if

as

7.0

~

me

ALIGNMENT

To

adequately align the RF Amplifier and

OF

THE

RF

AMPLIFIER &

HF

Os-

cillator an accurately calibrated signal generator and
an

output

quired

justments

Uld Figure 3 should be made in following this part

the

alignment which will now be described for one

frequency

followed for

To

is

coupled to
100 ohm
modulated

meter

The

receiver controls should be set as follows:

Control

meter are required.

are shown in table

is shown in Figure3.The

band.

The

same

the

other frequency bands.

align the .54-1.35

the

me

antenna input terminal through a

carbon resistor.

30

percentat400 cycles and

connected

Selectivity
Send-Receive

acl"Olls

tne

CW-Mod

AVC~Man

Audio Gain
RF

Gain

Band Switch

Limiter

The

frequencies re-

3.

The

locationofthe

useofTable 3

procedure should then be

band the signal generator

The

generator should be

the

output

fcceiver

output

terminals.

Position

Jkc
R.et:eive

Mod

See

Text
Set for approx. 20 volts
See text
set for band to be aligned

off

ad·

of

HF

OSCILLATOR

Set

the

receiver and signal generator dials to .56

The

RP

Gain control should be set at maximum and

the

AVe

- Man .switch set on

adjustment

showninPigureJ,should now be set for

maximum output.

L

adjwstment:.!l

.mould be set for maximum output.

Then

Ave.

the

Ant., 1stRFand 2nd

The

HP

receiver and signal generator dials are now set

me and

the

e adjustments, shown in FigureJ,should

me.

Osc. L

RF

The

to

1.3

be adjusted for maximum output in the same order,
beginning with
ing

the

e adjustments for the

RF.

This
til no increaseinoutput can be realized.
Man switch should thenbeset to
generator should be set

volts.

The
checked for maximum output, adjusting
control as found necessary

the

Osc C adjustment and then mak-

Ant,

1st

RF

and 2nd

procedure should be carefully repeated un-

The

Ave-

Man

and

the

signal

for

approximately:3micro

L and e adjustments should now

the

RP Gain

to

maintain the output at

approximately20volts.

Following the frequencies, shown in Table

the

remaining bands using

the

same procedure

3, align

above.

be

as

TABLE

RF

AND

HF

OSCILLATOR ALIGNMENT FREQUENCIES

FREQ. BAND
INMC

RFfSHF
ADJUST

RFfiHF
ADJUST

OSC

LAT.

OSC

CAT.

.H-1.35

.56

1.3

APPROXIMATE SIGNAL

Output

30

percent at 400 cycles. Signals applied to tube grids through a

AVe-MAN

BAND

measured acroas a 600 ohm resistive load

SWITCH

My
A,y

1.35-1..045
US-1..04S

1.3S-3..045

1.3S-3."'5

1.3'-3.45

7."'0-'.04.8

7.

.040-1.04.8

switch on

me:
me
me
me

me
me
me

MAN.

1.35-3..45

1..

3.'

TABLE

INPUT

CW-MOD

FREQUENCY

Audio

-400

cyda

Audio

.0400

cycles

Mod

RF

.455

k" Pin 1.

ModRF.04SS

Mod

RF

ModRF
Mod RF4"Ite

Mod RF 3.95S
ModRP

"'''

.o45S

1.955

h:

ke
k.e

AT

switch on

me
me

3.45-7.'"

3.75

7.1S H.S 29.0 S2.0

No.4

IF

at

No.3

AND

ADJUSTMENT DESIGNATIONS

7

....

-+U

7.'

'"

loP STAGES

output terminals

.01

MOD,

RP

INPUT

PinS,V17

Pin 2, V16B

PinI,VIO 6000

PinI,V9
Pin1,V7
Pin 7,
Pin 7, VS
Pin 7,

FOR20VOLTS

of

receiver.

mfd capacitor. Selectivity switchat3

Gain and Audio Gainatmaximum.

TO

Vll

V,

V6

14.8-29.7

13.0

RP

APPROX.

l.'

150 microvolts

29.7-''''.0

10.0

OUTPUT

signals modulated

INPUT

~I.

.J

~I.

.35

volts

miC1'ov())ts

110 microvolts

-40

miel'OV(llts

6'

mierovoltl

.040

miel'OV(llts

kc

13

e

e e

L41

L42

OT50

e

L38 L39

OT40

®

L37 L38

OT30

e

e[]8

@

e

I

LM

L331

ona

Ctot

r-----~;)

' ,

' ,

lee!

L:

________

@

"",

~

0

GND

a

8

~c

0

ANT

0

L

0c

0

15

0
0

0

0

L32

0

T'

0

L3'

0

@~

2R

0)~

H

8?

v

1"'-

\.

OOOOOgl

000000

000000

123456

e 0

'\

T8

/

~

.3

,/

0

L44

00

TOP VIEW

SHOWING

•

AUDIO

CURVE-Audio

---------

5

ai

c

o

z

CURVE - Owroll

ALIGNMENT

AND

frequency amplifier.

Selectivity switchin13kcposition.

RF

Gain

Output

Audio gain control01maximum

OF

CHASSIS

ADJUSTMENTS

riG.

OVERALL FIDELITY CURVES·

fideliiy

set

measured

for

3

at

20

volts

across

2.5

mc.

outputat400

Q

600

Inputtophono

Modulation

ohm

resistive load.

for

both

30

cycles.

curves.

-

terminals.

percent.

,

:y

5

'00

CYCLES

F'IG.4

PER

<000

SECOND

m,ooo

• SELECTIVITY CURVES

Overall

at

2 Megacycles.

w

u

Z

<t

Z

o

13

a::

iOO

too

NUMBERS

i.2

1

0

2 3

DENOTE

AND3NON

456

SELECTIVITY

CRYSTAL

-

SWITCH

4,5

AND6CRYSTAL

654

POSITIONS

3 2

1

I-IIt

III

III

13

::E

;::

10

11111

,

tN-

I

~

....

1

15

10

505

KC

FIG.S

OFF

RESONANCE

J

10

15

/5

VII

CONVERSION OF

MODEL

The

SP·600 Receiver is designed for either table

nbinet

ordered, the receiverisr.ot

'Cover

nck

il

cover pla.te since in most

inet type.

conversion(0rack mounting where table

been

insu.lling the cover kit; To install
piau,

by

of
two

or

IOlck

mountinll_

p~te

since

the

cabinet serves this purpose.

models are ordered the receiverissupplied with

bottom cover plate,

A cover plate kit is provided.onsepara.te order, for

ordered and where the covers are desired.

The

following inSUUctions

remove the two

removing

the

nut

the

JarK"t

side

plate brackets with

but

rtar

three

.screwsatthe

mountinr

RECEIVER

When

supplied

is not supplied with a top

~ses

shouldbefollowed

corner

brackets and replace these

the

uble. models are

with

• bottom

the

rack.isof

the

nul:

lower rear ends

two slightly shorter

the

moods

bottom cover

plate

bad:ets

TABLE

FOR RACK MOUNTING

from

the

kit, using the same ~ws. Remove the

lockwamer from the screw, nearest the bot,

chassis, holding capacitor C1St (see

from the kit, using

nut

a.nd

washer were removed. with the

(smaller end)ofthe

CQver

plate is now installed using

the

bottomofthe receivertothe

To

in.so.lI

the

tOp

cover plate assembly, place

being

and with pressure appliedatthe rearofthe

front panel, .secure

the

four

6-H

5(:r~$

the

tapped holes in

side mounting bn.ckets.

When

cab-

have

when

one!

nut and

tom

edgeofthe
bottom of chassis photograph). Insta.ll the short angle
bracket,
which
ta.pped

the

The bottom

10,32 screws from the kit

that

previously held
cabinet.
the cover with tbe angles

&:husis
plate.toMigbdy compress the rubber channel
the

rearofthe

place with

them in

dearance holesInthe

the

same screw from

bracket replacing the nut.

the

iUld

the

two lO'32 screws

downwa.rd.

from the kit, engaging

the

brackeu through the

the

auembly in

to~rd

against

five

the

'0

TABLE

No.5

Symbol

Designations

CIA,

B, C, D,

E,F,G,H

C3,5,

19,20,

21,22,23,24,

27,29,40,41,

42,43,44,47,

49,61,64,66,
68,

70, 71, 72,

73,74,100,
105,115,116,

121,122,127,

135,153,154,

m

C6,

30,

50

ca, 32, 52, 132

Cg,

33,

53

Cl1,11,35,SS

el2,

138,

145

Cl.

CIS,

139

CIS,

25,

lIO,

C37. 57,

C39,

C60,88

45,

112, 113

61

59, 99, 134

CO2

C63

COS

C69,

107,

117,

12.

cn

C70

C79.80

CO,
CO,
CO,

C07

CO,

COl

CO2

C93

COS

C96

C97

Cga,

102, 103,

104.106,108,

109,118,123,

136,

146,

148, 156, 157

CtOI

CUI

ell4

C119,125

e120,126

el2a,lSt,ISS,

159, 160
C129A,

IS2A,152B

el30

Cl3I,133

CI37

C140

C141,142

C143,
C144

elSO

C161A,B.C

El

147.

12gB,

149

DESCRIPTION

Capacitor,

S

sections

Capacitor,
Capacitor,20mmf
Capacitor,
Capacitor,33mmf
Capacitor,

Capacitor,7
Capacitor,
Capacitor,15mmi

75,

Capacitor,
Capacitor,85mmi
Capacitor,51mmf
Capacitor,12mmi
Capacitor,
Capacitor,39mmf
Capacitor,

Capacitor,
Capacitor,

Capacitor,

Capacitor,S
Capacitor,
Capacitor,10mmi.
Capacitor,
Capacitor,

Capacitor,

Capacitor,
Capacitor,51mmf
Capacitor,

Capacitor,42mmi

Capacitor,
Capacitor,65mmi

Capacitor, .022
Capacitor,
Capacitor,
Capacitor,
Capacitor,

Capacitor,

Capacitor,10mfd,

HS

Capacitor,

HS
Capacitor,27mmf
Capacitor,
Capacitor,

Capacitor,
Capacitor,
Capacitor,
Capacitor•.05
Capacitor,

800V

Capacitor,

450V.

trolytic

2

Screw

Input,

variable,

.01

mfd

2400

mmf

1500

mmf.

mmi

1000

mmf

100

mmf

2200

mmf
variable
220

mmi

3300

mmf
404

mmi

mmi

810

mmi

1200

mmi
120

mmi

190

mmf

92'

mmf

379

mmf

610

mmf.

mid
variable
variable

270

mmf

300

mmf

1300

C;I,n,

El~ctrQlytic.

2 x .05

Can,

Paper

430

mmi

.25

mid

100:1

mmi_

100

mmi

5100

mmi

mid

2500

...

HS

Terminal,

mmf

,....

3 x 20

Can.

mmi

200V.

..

Phone

.

100V

mfd

.

.

....

mfd

Elec-

Hammarlund

.

3400I-GI

.

23012-1

.

23003-41C

.

23011-40C

.

23003-45C
23011-62C

.

23061-Hi8F

.

23011-58C

.

23061-155J
23003-94C

23071-59

.
.

23003-87C

.

23023-65UJ
2301l-17C

.
.

23003-47C

.

11126-Gl09

.

23003-I02C

.

23011-69C

.

23071-67

.

23023-8UJ

.

23072-53

.

23003-2B

.

23011-60C

.

23011-50

.

23011-&4

.

23071-71

.

23023-45UJ

.

23071-453

.

23071-69
23072_52

.

23071_58

23013_1

.
.

11725-0151

.

11776-01

.

23003_104C

.

23003-105C
23011-61C

.

15462_1

.

15461-1

.

23023-71Uj

.

23003-109C
23911-79E

23015_27A
23024-24SL

.

23015-16A
23911-77E

23070-40

.

15463-1

.

4904·5

PARTS

Part

No.

LIST

Symbol

Designations

E'

&3,4,5,6

E7

EO

E9,

10,11,

E13,H
E15, 16

E17
E18

Fl

n

J4,5

Ll

L2

L'
L.

L5

L7,

14, 24,

LO

L'

LIO

LU

LI'

4
Dial

Dial

2

1

12

1

6
8

15

3

Fuse,
Fuse

Fuse

Antenna
IF
Phone

PowerorRelay
RF

RF

RF

RF

RF

RF

35

RF

RF

RF

RF

RF

RF

DESCRIPTION

Screw

Terminal,

Output

Lamp,

]4azda

Lamp

Assembly
Solder
Solder
(Jeft)
Solder

Solder
Solder

Solder

Term.
term.

term.

(right)

term.
term.

Solder

(meter)

receptacle
cludes

Switch
SIA

cludes
Switch

SIA
cludes

Switch
SIA

cludes
and
for

cludes
and
for

dudes
and
for

henriel

sembly,
27,

contacts

bly, includes C28, 29,

L9,R8and

tactl
bly,

32,

contacts
bly,

35,
Switch
SIB

bly, includes C36, 37,
L12
tacts

tenn.

term.

3 Amp .
Holder

Holder,

Input

Output

Jack

Input

C2.3,Ll

Input

C4.5.L2

Input

C6,7.8,L3and

Input

C9, 10, 11,

Switch

SIA

Input

C12. 13, 14,

Switch

SIA

Input

CIS. 16,

Switch

SIA

Choke,

TranlfClrmer

includes

LB,

R1

ior

Transformer

for

Transfarmer

includes C30, 31,

LI0

Transformer

includes C33, 34,

Lll.

Transformer

and
for

Audio

No.

47

..,..

Socket

strip

strip

.

strip

strip
strip

strip..,.

strip

Spare

Socket..

Socket

usembly,
contacts
assembly,
contacts
assembly.
contacts
aSlIcmbly,

contacts

assembly,

contacts

assembly,

17,

contactl

192

micro·

assem·

and

Switch

SIB

assem-

Switch

SiB

assem-

and

Switch

fQr

SiB

assem·

RIO

contacts

Switch

SIB

, .

and

and

C26,

con-

.....

and

assm·

con-

.

.

.

.
.

.

.
.

.
.

.

in-

for

.

in­for

.

in­for

.
in­L4

.

in-

L5

.
in·
L6

.

..

.

.

for

.

.

Hammarlund

Part

No.

31141-1

16004-1

31453-1

16650-12
16650-9
16650-11

16650-10
31163-01
31162-01

31454-01

15928-8

15923_1

15923·4

15959-1

16111-1

5066-1

35013-1

31387-01

31390·01

31393-G1

31396.01

31399-01

31405-01

15612-01

31386-01

31392-01

31395-01

31398_GI

17

PARTS

LIST

(Continued)

Symbol

Designations

L13

LIS

LI.

LI.

Ll9

L2Q

L21

L2Z

L23
L25

L2.

L27

L28

L29

L30

L47

L48

L<49,50

L51

L52

MI

PI

P2

P3

"'

DESCRIPTION

RF

Transformer

bly,

LI3
tacts

Same

C<46,

Switch

includes

and

for

all

47,

Switch
SIB
LB,

LIS,

contacts

assem-

e38,

includes

Rl1

SIC

Same

Same

Same

Same

Same

RF

RF
RF
HF

HF

HF

RF
RF

RF

2nd
Tuning

as

C48,

Switch

SIC

eso,

and

for

C53,
and

for

C56,
Switch

SIC

e58,

Switch

SiC

Cboke,

ries.., .

ries

cludes
L25
tacts

dudes
and
for

HF

cludes
L27
tact$

HF

cludes
L28
tacts

HF

cludes
L29

tacts

cludes
and
for

Choke,

ries

Choke,2ohms

Choke,

Ist

Filter

170

+40

Power
Antenna
Antenna

nector

Cable

(for

L9, includes

49,

L16,

RI8

contacts

a.

LIO,

52,

includes

Ll1,

contactlJ

51,

Switch

SIC .

all

Lll.

5-4,
Switch

SIC

as

51,

includes

55, LIB,

(;onta~s

L12, inc1udcli

L19

contacts

as

LI3,

59,

includes

L20

contacts

1

Choke,
Choke,

Osc.

and

Osc.

millihenry

10

millihen-

25 mUlihen-

alsembly,

C76, 77,

Switch

f(X"

SID

assembly,

C81, 82, L26

Switch

contacts

SiD

Osc.

assembly,

C83. 84,

and

Switch

for

SID.

Osc.

assembly,

C86, 87, 88,

and

Switch

for

SiD

Osc.

assembly

C90, 91, 92,

and

Switch

for

SID

.......

Osc.

assembly,

C94, 95, 95, L30,

Switch

contacts

SID

3.8

millihen·

2.7

ohms

Choke

ohms

Filter

ohms

Meter

plug

Input

Adapter

_

Connector

}2)

dc

Choke

dc

and

....

8.5
20

cord.

Plug.

con-

Rig

con-

con-

con-

con-

de .

Con-

Plug

39,

.

and

for

.

and

for

.

H2O

.

and

for

.

and

for

"

.
in­78,

.

in.

.

in­85,

in-

89.

.

in­93,

in-

.

.

de.
Hy,

.

Hy,

.

.

Hammarlund

Part

No.

31404-01

31386-01

31392-01

31395·01

31398-01

31404-01
15617-01

15618-1
15619·1

31385-01

31388-01

31391_01

31394-0]

31397-01

31403-01
15616·01

15611-1
15613·1

31030·2
31031-2

4903-2
6143-1

16016-1

15987.1
16071-1

Symbol

Desirnations

RI,

13,

26

R2, 12, «, 52,

57,

S2,

90, 91,
92,70
R3, 14, 39, 48.

53

R4, 6. 16, 29,
30,47.83,102,
103, 104,
106,107,108,
109,110
R5, IS,

R7,8,
R9,19
RIO, 11,20,21,

R22, 23, 64. 65.

"

71

R24,25

17,

105,

32

18

R27

R2I

R31. 37, 41, 49,

54,58,80

R33

R34. 35, 38. 43,
51,56,62.67,
68,75,76,81,

10'

R36,96

R40

R42,

SO,

55

R46

R"

R60,61

R.3
R.6

R69,74

R"

R73

R78,98

R70
R84

R65

R86, 89,

R87,88

R93

95

DESCRIPTION

Hammarlund

Resistor

watt

Resistor

watt

Resistor

watt

Resistor

watt

Resistor

watt

Resistor

watt

Resistor

watt

Res;stor

watt

Resistor

watt

Resistor

watt.........

Resistor

watt

Resistor

watt

Resistor

watt

Resiaor

watt........

Resistor

watt

Resistor

watt...

Resistor- 20K

watt............

Resistor

watt........

Resistor

watt

Resistor- 2200

watt.

Resistor- 1

watt

Resistor

watt.

Resistor

watt...

Resistor

Ohmli 15363-1

Resistor- 20K

watt.

Resistor

watt......

Resistor

watt

Resistor

watt......

Resistor

ohms

Resistor
Resistor
Resistor
Resistor

S10K

ohms

!1

10K

ohms

33K

ohms

1000

ohms

__

.. ..

..

510

ohms

.

....

51

ohms

24

ohms

....

,..........

22

ohms

.....

47K

ohms

180

ohms

150

.....

.....,.....

.....

....._....

watts
watt
watt
ohms

S10 15342-21

ohms

,...........

6800

ohms

2200

1500

lOOK

22K

10

100

. 19310-57BF

27K

. . .... . . .. . .... . 19309-83BF

18K

variable

..

5CK

470K

680

variable

2500

82K

120K

variable

includes

,.....

ohms

,......

ohmlJ

.

...

ohms

ohms

..

ohms

ohms

.

.... ....

ohms

.... . . . . . .. 19309-2SBF

ohm.

megohm

'... 19309-12IBF

ohms
ohms

. 19309.79BF

ohms

. 19309-218BF

ohms

..

ohms

. . . . . . . ....19309-113BF

ohms

. 19309-45BF

ohm

ohms

.

ohms

switch

19317-76BF

Y2

19309-278BF

7'2

19309-262BF

n

19309·49BF

%

193og_170BF

n

19309_193BF

7'2

19309.189BF

Y2

19309-9BF

7'2

19309-89BF

7'2.

19309-31BF

tii

19309.259BF

7'2.

19309-69BF

7'2

.....

19309·57BF

7'2.

.....

19309-53BF

Yz

19309_97BF

7'2

. 19309-178BF

1

.....

19310-179BF

7'2

19309-IBF

Yo:

1

~

7'2
tii

1000

7'2.

1

1!)310-18CBF

y,;

y,;

500K

10

tii

..

!1.

SOK

15342-11

19309-287BF
19J09-181BF

Part

19396-1

No.

/8

PARTS LIST (Continued)

Symbol

Desiandions

R"

R07

R99

RI01

SlA,

B, C, D

'2

53

'4

SSA, B, C

56.9

57

58

'10

'11

Tl

T2

T3

T4

T5

TO

T7

T8

Xl,2,6,7,8,9,

10, 11, 12, 13,

14,15,18,20

X317,19

DESCRIPTION

Resistor

1100

watt

Resistor

Yz

Resistor

Rellistor

ohms

Switch,

watt

360

.,"

bue

3.3

.........•..•.

ohms1watt

vil.riil.ble

"." .

and

assembly

Crysal
Crystal

Swit~h.

Selectivity
TonIe

Toggle

Toggle

Switch

Switch,

Mixer

IF

Crystal

IF

selector

switch

~onver1lion

sWltchmg

tion

switch, 3

Switch

Switch

Switch

"ON-OFF"

of

R93

return
bly, includes C67,

bly,
99, L33,

DPDT,

plate

70,

L31,

32,

Transformer

includes C97,

34,

Filter
includes
112,
R41,

Transformer,

C1I7,

CI07, 110,111,

113,

114, L36,

Ya

118.

coil

L38, 39, 40,

Same

Beat

Transformer,
Transformer.

Tube

Tube

as
C123,
L41, 42. 43, R54

assy.,
131,

45. 46. R76,
Output

T4,

124,

Frequency

includes Cl3Il,

132, 133. 134,

socket.

socket.

octal

ohms

me,ohms

25K

sprine:

switch.

set-

SPST

DPST

DPDT.

part

....

spring

assem·

R31.

assem-

R35 .

assembly,

includes

119,

120,

R49.,

....

includes

125, 125,

.....

Osc.

L44.

77

Audio

Power

miniature.

Y2

19309-208BF

"

19309-133BF
19310-211BF

15342-4
31234-01

.

15879·1
31469-1

.

15862-1

.

.

15856-1
15864-1

..
...

15866·1
15867-1

.

15880-1

69,

31183_01

"

93.,

31116-01

37,

.

31114-GI

31102-01

31102-Gl

.

31106-01

,.

31029-2

.

31086-2

15989.4

16082-1

Hammarlund

Part

No.

Symbol

Designations

X4

XS

X16

X2l

Vl,2,3,4.5,6

Y7

Y8

Miscellaneous

DESCRIPTION

Tube

socket,

ceramic,

shield

Tube

socket,
ceramic,
shield

Tube

socket.

Crystal

for

crystalsVIto

Crystal,

specify
quency

Crystal,

Crystal,
Wrench,
Wrench.

Wrench••et

Snap

Button

Shaft

Coupling,

Shaft

Coupling. flexible,

soft

Shaft

Coupling. flexible.

stiff .

Spring,

coil

assemblies

Sprinl,

coil

Sprine.

transformer

Spring,

switch

Spring,
Spring,

detent

Knob.

frequency

Knob,

tuning

Knob&:Skirt
Knob&:Dial

Knob&:Di..l

(Audio

Knoba:Dial

(Crystal

Knoba:Dial

(Beat

Knoba:Dial

(Selectivity)

Chart,

frequency

Spring.

miniature,

less

miniature,

with

"Noval"

socket, ceramic,

order

signal

3.5mc
455kc .

set

screw

set

screw

screw

Plue

retainer

retainer

grounding

shields

conversion

....

indicator
band

change

lock

(larle)

(RF

Gain) .

Phasing)

Frcq.

anti-backb.lih

.

special,

..

riiid.

for

for

....

slide.

control

O.e.)

control

center

center

V6

fre-

No.6
NO.8

No.

RF
RF

for

IF

O

..

in)

...

....

...

Hilmmarlund

15989·5

.

15989-3

..

16100-1

16092-5

.

31473-stlec.

31130·1

31471-1

11806·2

11806-3

10

11806

_

2%19_2
31275_01

415_03

.

415-02

.
.

31004-1
31023-1

..

31125-1
31126-1

.

31205-1

31434-01

.

31462-01

.

31215-01

31227-01

31227-02
31227-03
312Z7-G4

.

31227·05
31463-1

31239-1

P,.rt

No.

....

/9

~

-:,:

,

~;

,

"

.

,

•

•

.'J

;~

~'fY

G·

.:~~

: .

~

0

I

-

..

'@3'"

~

.,

"

J'

~

.

,

'.

AtAR

\/'1[W

flC.6

or

R[C£IV[R

-"

•

....

_

....

-,

-

FIG.7

'0'

Vll::W

or

RECelV[R

;-:---~~--~~--_._--=---~

TOP

CAPACITOR

VIEW

FIG.

or

SHIELO

&

l'tt.C[lV[l't

AUAOV[D

"--

BOTTOM

VIEW

F'

IG. g

Of'"

R[CI:IVI:F1

'P-600-Jll.

!!lOTTO'"

TU

....

ING

UNIT

rIG.

VIEW

5H1ELD

10

or

IUCCIVEIt

IlE~OV[D

, , .

"

•

",0

RED

"

®

9

"

BL

'OK

c

w

"

"

CO2

" "

A

K-WHIT

REO-BLACK

'0

L.

.<

REO-WH

R93

R

CI61

13.

VI'

MAIN

WIRING

CABLE

o

"'@'"

0 0

o 0

OSCILLATOR

TERMINAL

LOCATED

ON

BOTTOMOFCHASSIS.

~

OVER

NOTE: SWITCHISMOUNTED

ON

TUNING

BY

e.~3

1-2

0

BANDSWITCH

CL.OSED

CLOSED

UNIT

BELOW

ABOVE

~O

~

•

O~

0

OPEftATED

t;

b>

0

RED

SOCKETS

[!H~Qi.[D.J

REEN

BOARD

va

a

0

V6

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7.4

hie

7,4

Me

I\

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CIOI

0

0

r

~"JJI

~

~

0

J.-.

WHITE-BLACK

WH-GREEN

P

S82

I

•

,

,

"

o

BLACK

,

.,

RB'

'---

__

L

2

~A<'

-!~

"

I

i:

"

"

27-28

/\

I R74 '

BLACK

WHITE

,@

'12"

Cl29A

'5

FIGURE NUMBER

12

CONNECTION DIAGRAM-RECEIVER CHASSIS

*THESE NUMBERS ARE

ONLY.

THEY

DO

NOT

TERMINAL

STRIP

RED-GREEN

FOR

REFERENCE

APPEAR

ON

1ST

RF

VI

6BA6

~

V2

6BA6

,

•

•

,

u

~

"

~

'"

,

..

'1

~

:il

'.'

(

f2

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L

__

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u

CI.

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C24

C26

I~

IIc27

§I

~,

t,l.""

~

L.

elc.1*"

C2.

r''=1

CI'ZZJ""I

.7

L

__

,

~1_C31

044

-C45

SIC

=-t--::---j

C4

•

"i'CIO

-L

TUNING r

1

__

,--,1

-

_

~,

In'

erE

..L__-"____

l!l~

.~~--~~==;-~::L~2~O=::;

r~

¥.,l;? IllZ/ll

@ If

r'"

/j'CIF

~t

1'7

,

--

" - ,

Li.

~L2',

~

-

_

-1

~

~

p~

074

mol

't1~~~'

Cl~;r.

SID

../

,

07.

<'J

•

,

,

I

,

i

~

,/

CIH!

:

I

,

I
I

,

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f-,j~§~IL-lt:j:+

:

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err

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c~

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o~c

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'9

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L20

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I I C

--

I

C86

l28

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c~o

I

I.... 0

,

9411f'"

',"

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N"

L29

en

·~n

C91

L30

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c)

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, : I

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1

1.....-

)

S9

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J

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1ST

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VS

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TO

GATE

V7

6BA6

,

S!5A

//

/

/

(

i

Lj\

I

/".-'

L..::-......

"

SELECTIVITY

-<>.

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o_-.}

R47

"

sw.

.46

••

S

I

I
I

I

I

-'

T4

55.

IF

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I

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1-

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250

Z54~

210

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14

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1

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511.

II

RECTIFIER Ree V

Vr9

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!5R4GV../

~

~rJ'~

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20

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RaO

V.

__

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RS

J4

117

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l~

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D

I~

10;.;

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5

7.5 V C

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DIAGRAM

,L~

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-:;-

OF'

25-26

2:

.,

1

2MQ

VI'

DfT

6AL5

SAve.

VI5

UMlTERS

OUTPUT

METER

6AL5

, ,

- --_

......

5.

VI.

)1

.l.-

~

<G.

,

_51'1.

J~

+~u

Kl

MIX.

/

,

•

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d!

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"AN.

_.

."

cc

.

~

..

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cu

~

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h

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r

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a

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J3

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ow

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o ,

31

c.L

11

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~

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t

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PHONES

r:

.,

METER

V.

~

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..;..

I

,

,~

,

•

•

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' I

II
II

,

"

A.F.

*

;;

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: .

r~

•

•

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R70

OUTPUT

LEVEL

'W.

VI7

OUTPUT

6V6GT

3

..

,-"":'-

••

.. ,

3

:~CI51

~

AF.

METER

\ I

RIO!

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•

tECEIVER

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