Hammarlund SP-600-JX User manual

GENERAL PURPOSE
COMMUNICATIONS RECEIVER
MODEL SP-600-JX
INSTRUCTIONS
Manufactured by
THE HAMMARLUND MFG. CO. INC.
460 West 34th St. New York 1, New York, U.S.A.
P,iftted in U. S. A.

F'IG.l
F"RONT VIEW or RECEIVER
SP-600-JX IN CABIIHT
r

Titk
TABLE OF CONTENTS
Page
Technical Summary .....................•....•....•..•. , . •. . . . . . •. . . . . . . . . . • . . . • . . . . . . . . . . . . . . -+
IGeneral Description ,............................................................... 3
II Circuit Description _. . •. ..•.... •. ..................... •. . .• . • . . . .•. ........ .• ...... 6
IV Operation and Description of Controls .
III
Installation ..............................•.....•...•.•....•...•......•...•....•.....•...
..8
8
V
Maintenance
9
Table 2-Tube Socket Terminal Resistances.~ .........................•...........................
Table I-Tube Socket Voltages .....................................•....•... , .
VI Alignment .............................................•........•......•.•.............
VII
Conversion of Table Mode! Receiver for Rack Mounting, , .
l1
l6
lO
II
Table 3-RF and HF Oscillator Alignment Frequencies. .........................•.•..........•.. .. 13
Table 4-Approx. Signal Inputs at IF and AF Stages............................................. 13
Table 5-Parts List ...........................................•........•.....................
ILLUSTRATIONS
l7
Connection Diagram-Frequency Control Unit........................................... 3L
Location of Tubes and Adjustments........ l-i-
Audio and Overall Fidelity Curves..................................................... 14
Selectivity Curves ........................................•.•....•.•.•.............. 15
Rear View of Receiver. . . . . . . . . •. . . . . . . . . . . •. . . . . . • . •. . . . . . • . • . . . . . . . . • . • . . . . . . . . . . .. 20
Top View of Receiver.................................. •...•...............•...•.... 21
Top View of Receiver-Ca.pacitor Shield Removed. ......... .. ..... .. ..... •. .. ........... 22
Bottom View of Receiver SP·6(X)·JX.................................................. 23
Bottom View of Receiver-Tuning Unit Shield Removed................................. 2-i-
Circuit Diagram of Receiver. ..............................•....•........•.... •.. . . . . . 25
figure
Figure 1
Figure l
Figure 4
Figure 5
Figurc 6
Figure 7
Figure 8
Figure 9
Figure 10
Fie-ure It
Figure 12
Figure 13
Figure 14
Front View of Receiver SP·600·JX, in cabinet .......................•...•....•..........
Block Diagram ........................................•...•............••..........
Connection Diagram-Receiver Chassis .........•...•........•....•........•............
Connection Diagram-Tuning Unit .
2
7
17
29
3

.54 to '4.0 me
.5" to 1.35 me
1.35 to 3."5 me
3."5 to 7."0 me
7."0 to 1".8 me
14.80 to 29.7 me
29.70 to 5".0 me
GENERAL PURPOSE COMMUNICATIONS RECEIVER
MODEL SP-600-JX
TECHNICAL SUMMARY
Electrical Charaderistics
Frequency Range--total 6bands ......•....•.•.•....•....•...•....•..................
Band 1 .....................................•................•.....••.••..•...
B.nd 2 .............................•...................•....•.•..............
Band 3 •........•.....•..•..•..•.••.....•..•......•...•....•........•....•....
Band .oj. •••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••••
Band 5 ...•....................•.........•.....•...•....•..•.•......•......•..
Band 6 ................................................................•......
Maximum Undistorted Output-approximate-2.5 watts.
Output Impedance-600 ohms-bOlla-need split windings.
Phone jack-winding; delivers 15 milliwatts to an 8000 ohm resistive load, when the audio output to the
600
ohm power load is adjusted to 500 milliwatts.
Power Supply Requirements
Line Rating.......................... 9$, 105, 117. 130, 190,210.234 and 260 volt taps, 50-60 cycles.
Power Consumption.................................. 130 watts, 1.25 amps. at 117 voltr-maximum.
Tube Complement-total 20
RF, IF and BFa ·Amplificrll _ .....•................................... 7 - 6BA6
HF, 2nd Conversion and
BFa Oscillators ........................................•..... 3- 6C4
Crystal Controlled HF Oscillator. ..................•...............•....•......•... .. 1- 6AC7
Mixers. .........................................................•............... .. 2 - 6BE6
Detector,
"C" Bias Rectifier and Noise Limiter fT Meter Rectifier ...................•..... 3- 6ALS
AF Amplifier and IF Output ....................................•....•.............. 1- 12AU7
Power Output .................................•......•.....•.........•......•..... 1-6V6GT
Rectifier. ••. . . • . . . . . . . . . . . . . . . . • . . • . . . . . • . . . . . . . . . . . • . . . . . . . . . • . •• . . . . • . • . . . . . . . .• 1- 5R"GY
Voltage Regulator .............•.............................•..................... 1- oAz
Mechanical Specifications
Rack Model-Dimensions; 19 inches wide, 1O~ inches high and 16~ inchell deep from nck mounting
surface.
Weight 66 Ibs_
Table Model-Dimensions; 2Iti inches wide. 12~ inches high and 17;4 inches deep. Weight 87}1lbs.
Performance Data-(approximate values-taken on asample receiver)
Sensitivity is 2.3 microvolts. or better, throughout the entire frequency nnge, for asignal to noise power ntio
of 10 to l.
Image rejection ratios are better than 80 db throughout the frequency range.
The IF rejection ratio at 600 kc is 2700 to 1
The AVC action will maintain the output constant within 12 db when the input is increased from 2 to
200,000 microvolts.

GENERAL PURPOSE COMMUNICATIONS RECEIVER
GENERAL DESCRIPTION
The SP-6Q(}]X is il 20 tube Radio Communications
R~cciW'r with self contained powu supply. The ]X
suffix in this modd number &noUS that this rtteiver
is made in ilc:urmnce with JAN speci6carions. with
the exception of the use of afew capacitOR ,lind resis-
tors where spectal design considerations require special
" .. lues cnd tolerances not included in the JAN pre-
ferred ~lue lists or where space limitatiOn! do not
permit their use. The special components so used are
equal or superior to the JAN components in quality.
The receiver is supplied in either awell ventilated
sted. table model cabinet finished in dark grey to com-
plement the lighter grey front panel or for mounting
in astandard 19 inch relay rack.
The self contained power supply is designed for
operation from asingle phase. 50 to 60 cycle alternat-
ing current power source. The pov.·u tran.s(ormer
primary is provided with tilps covering a. line voltage
range from 90 to 270 ","Olts. The fIO'NU CQnNmprion
is t 10 watts..
The receiver is suitlble for either headphone or loud
spulc.e:r rttepcion of AM radio telr:phone, CW tde'
graph or AM MCW telegraph signals.
The standard modd provides continuous CQvcnge
OVtt afrequency range from 0.S4 to 54.0 megacyd~
in six bands. The large QSI1y operated band change
control knob, on the front panel, selects the desired
frequency band and ahand indicator visible through
asmall front pane! window indicates the frcqucm;:y
hnd in U$C. This control also aligns the dial frequency
indicator with the proper dial scale.
In addition to the frequency scalu, the main dial
has an arbitrary scale which in conjunction with the
b;md spread dial provides continuous band spread
scales over each frequency band for extremely accu-
tate logging and tesetability.
The single tuning control is large and of special de-
aign to permit m;lximum tr.lV1!:l'Se apeed ill weU :u ex-
ceptional operating ease. It controls both the main
and band spread dials. An anti-backlash gen tnin
provides extremely close calibration accuracy and com'
pletely accurate resetability. Atuning lock provides
pll-'itive locking a.ction without alfecting the frequency
setting.
The tuning ratio from the tuning control to the
main dial is 50 to 1and the n.tio from the band sprud
d~1 to the main did is 6 to 1.
An ingeniously designed rotary turret is employed
to change bands and to place the coil assemblies o(
the RF amplifier. Mixer and First Heterodyne Qscil-
5
lator sta.ges diucrly adjacent to their respecti .... e .sec-
tions of the four gang tuning capacitor and their re-
spective tuba. This assuIe5 maximum sensitivity at
high signal to noise. ratio.
Two stag .. ." of tuned r.\din frequency amplification
arr: provided on ..II bands. The circuit (or single con-
vemon, used on frequencies up to 7.4 megacycles., in-
cludes amixer, heterodyne o.sciHator, four stages of
IF amplification, detector and AVe tl:ctifier, noise
limiter and meter rectifier. heat frequency oscillator,
beat frequency buffer amplifier, IF output, AF ampli-
ner and output power stage. The circuit for double.
conversion, employed for frequencies above 7.4 mega-
cycles, includes asecond mixer and asecond hetero-
dyne crystal controlled OKilIator. The power supply
system includes ~ Bpower rectifier, Cbias rectifier and
avoltage rtgub.ror.
The frequency control Wlit provides (or bed chM!-
nel crytta.l controlled Open.tK)fl on any six frequencir:s
chO!Cn within the n.nge of the receiver. front panel
controls permit the wection of the normal high stabil-
ity continuously vuiable nming or either of the six
selened fixed frequency signak For crystal controlled
bed. channel opention it is only necesstry to .5rt the
dioal to the signd frequl:IlCY, 5wilCb to the cry5Ul fn·
qumcy desired and tune widt the delta frequency con-
trol. No retWling of the mJ.in tuning is nr:cessary or
desirable, when llwitching from VFQ to crystal open.-
tion for the same signal frequency. Theae crystals are
not aupplied with the recaver, bur aMuld be pur'
chased on special order from HAMMARLUND
MFG. CO. specifying the signal frequency for which
it is to function.
The two scale tuning meter normally indicates the
relative strength of the rectived signal in db from 1
microvolt. when operated on Ave and with the RF
Rain control at maximum. 1\ rear control is provided
for adjustment ~t the plus 20 db scale mding with an
RF signal input of 10 micro'l/Olu. On depression of the
panel meter SWItch the lower scale of the metee indi-
cat£l1 the audio output pawn level in db from 6mllli-
wan .. Arear control is provided (oe adjustment of
the 0 db reading.
The Ave drcuir is provided with $Cpan.te rime
constants for ON and MeW operation. The beat fo::'
quency oscillatot employs a high capacity Colpitts cir-
cuit which gives ahigh order of frequency stability
and minimizes oscillator harmonics. The beat fre-
quencY oscillator voltage is introduced into the tk-
teetQr throukh abulfcr ampliner which eliminates
OKillator lock-in. This feature makes it possible to
tune $ignais sharply to :ero beat and ~mits the in-

c:hwon of the rear c:ontrol for adjuacing the beat oacil-
Iator injection to suit operating conditions. Afroot
panel control nrielll the a.udio beat frequency from 0
to plus or minw J:Ke.
The noise limiter circuit effectively limits the intu-
ference. from ignition systems Of' other.souras of pulse
type noi.sc. The limiter switch permits optional UK of
the limiter.
The antenm input circuit is designed for use with
abalanced line. The input impecance is nominally
100 ohms_ The nceiver may also be operated with a
conventional single wire antenna_
The audio output circuit is designed for a 600 ohm
lmd or line and is provided with afour terminal split
windiog for bclanced 10.1I.J opt:r",tioll. UnJill.torted
power output is approximately '2.S watu. The head
phone circuit .... hen referred to an 8000 ohm load pr0-
vides aignds attenuated approximateh' tS db below
the 600 ohm power output.
An RF gain control is provided for the manual con-
trol of sensitivity in the presence of strong signals and
operates on either MANUAL or Aye.
The send nceive switch desensiti:es the nceiver
but leavelll the power on to provide for in~nt recep-
tion between transmission periods. A reu Kcepta.de
provides
for the connection of an external rd;ay.
Radiation is negligible and oomplics with require'
mttIts for shipboard operation and for mu[ti-ccceivn:
install.ttions.
Frequmcy drift Uter a l.S minute warln up period,
nnga between .001 percent and .01 pc.rcent of fre-
quency depending 011 fu frequency wed. This is a
very unusual degru of frequency stability for wriilblc
tuned HP o.sciUa.tors and closdy approaches crystal
_;lily.
The selectivity control provides th.r« degrees of
crysta( and three degrees ()f nCJn-crystal selectivity
ra.nging ftom
shup (.'2kc) to broad (13.:KC). The
crystal. niter embodies the same circuit features that
have proved 10 effective and desira.ble in Hammarlund
Super Pro Receivers, incorporated in an improved
mechanical design.
II
CIRCUIT DESCRIPTION
Gmoual- The circutt I. .hewn KhelJliltic:aUy in
Figure II. Abloc:k diagram, Figure 2, is provided to
more dearly !how the arra.nRCmcnt and function. of
the variou.a circuit sttt:iotu. The location of the vui-
ou.s tubes is shown in Figure J. The circuit, for ,m~le
cmvcnion, uaed for ~ frequenciet up to 7." mc
l"CII1aias of two ata~e:s of RF am.pJ.mcation V-I and V-2,
First: Mixer V-S, Fira: Hctuodyne OaC:illatOI" V- ... four
stagca of IF amplification V-7. V·9, V-tO ilnd V-11.
Detector and Ave ltttiiiu V-H, Noise Limiter V-IS.
Beat F.requency Osc:il.latol" V-B. IF output ;and AF
amplifier V-l6-A ;and V-I6-B. Output Powel" stage
Y-17 and the Powel" Supply systcm which includcs B
Power Rectifitt Y-19, eBias Rectifier V-20 and Volt-
age Regulator V-IS.
In the circuit for double conversion, used for signal
frequencies above
7.1- me. the Second Mixer V-6 and
Second Heterodyne Oscillator V -8 are substituted for
the Gate tube V-7.
Input Coupling - The antenna. coupling is designed
to provide optimum coupling from a 100 ohm tnns-
miaaion line. Abalanced doublet or straight wire In-
tenna maybe UICd.
RF AmpIi£e.r - An in~ou!Iy designed rotary
turret is employed to change bands and to place the
cciI. &MCmblic.a of the RP I.!Il.plifiu V'I and V-'2, Mixer
V·ji
and Pint Heterodyne Osollacor V-" stages di-
rectly adjacent to their respective sections of the four
gang tuning capacitor and their ttSpeetive tubes. This
a..ssutt5 m.uimum sensitivity at high signal to noi.sc
nbo.
rani Hdnudyne O$CiIWor-(VaMble V-4)-
The rotary turTd: band change switch, advanced de·
sign of the four gang, twin aection, variable tuning
capacitor and rugjte.d construction throughout, pro'
vide irequency a:a.bility ~d dw calihnrion :u:cunq
to ;a previowly wuttained degree.
p;". H .. ....tyn. 00ciIIa,,,, -(C.,...a Cantn>ll..J
VoJ) - Por aervicell requiring extremely stablc, fixed.
frequency operation, a crystal. controlled high fre-
quency oscillator is provided..
Instant changeover from
variable to tty5ta1 controned oscillator, with achoict;
of m: crystal. positionll, is effaud by a frant pand coo-
trol. Asecond front panel control permits ;adjustment
of the crystal oscillator frequency over a plw or minus
.ooji
percent range.
Intennediate Frequency Amplifier-Single conver-
sion to HS kc is employed for signal frequencies be-
low 7.4 mc. There are four stage.s of If amplification
incorporatini" the HammarlWld patented cry.5l:al filter
circuit. Six positions of selectivity provide 6db band·
widths of .'2., .', 1.3, 8 and 13 kc:. On the.thne nu'
rower bandwidth positionll, the crystal filter is in op-
ention. The crystal phasing control provides extreme
selectivity for the high attenuation of dOKly ildja~nt
intctferinC signitls.
Double convusion is employed for signal frequen-
ciu above 7." me. The signa.! is heterodyned to ~.9jiS
me by the Pint Mixer Y-S and Heterodyne OscillatOr
V·" or V-] for high image ttjcction. The 3.955 mc
signal is then heterodyned to "SS kc by the Second
Miur V-6 and the J.S mc Fixed Crystal Controlled
Osc:ilbtor V-S, foe aelectivity.
Dcucto.- and Ave -1bc V- 14 tube is wed as a
high. level Deta:tor ;and Ave Reetifi.er. The AVe cir-
cuit is provided with separate time constants for CW
and MCW opention.

Beat Fn:i:Juency Oscillator - The beat ffequency
OlIciliator employs ahigh capacity Colpitts circuit which
gives a
high order of frequency stability and minimizes
rncillator harmonics. The beat frequency Oscillator
V'l3. is coupled into the detector circuit through Buf-
fer Amplinel' V.12, which eliminates 05Cillator lad-in
and permits variation of the beat oscillator injection by
means of acontrol located on the rear of the ch~sis.
Afront Panel control varies the audio beat frequency,
from .tero beat to plus or minus 3kc.
Noise Limiter- The noise limiter circuit V·15,
limits the noise interference from iR'nition systems or
other sources of pulse type noise. Aseparate control
Power Supply - The power l,Iupply is an intelitral
part of the receiver. It includes the Brectmer Y-19
and
the Crectifier Y-20, to~ether with their respective
low
pass filters and the Yoltage Regulator Y-18. The
power transformer is provided with screw terminal
primary taps, covering apower line source range of
90
to 270 volts, 50 to 60 cycles. The power trans-
former
is protected by afuse in the primary circuit.
Tuning Meter-The tuning meter is used on Aye
operation to indicate the accuracy of tuning and the
relative strength
of received signals. Depression of the
Meter Switch converts the meter circuit for indication
of output level in db from 6milliwatts.
'" """"
LEVEL METER
IF OOTPUT
'"
'"
'M'
'"
BUFFER
'"
'"
''''
..."
-<
... V9 ,~
'"
Vi ....
"" "
; 'FAMP
IFAMP
~
DRIveR
OET
AFAMP
"'n>oT
""
''''
""
... "
12AU7 6V6GT
0
Vi6A Vl~A
""
IFOUT LIMITER .Em<
12AU7
GAL5
~"
-.~
"';."~
"
'FO
""
"
irIllXER
".
!"
..
,
,~ ~/
<"@.,.
,",
,m
''''
CRY5TA.l. CONTIIOUEO
'\[7
"
'FO
'"
1
-" " "
.'
" " MIXER
SBAS
.'"
, ...
"
,"0
6OG7
'SLOCK DIAGRAM'
''0
eRECT
~"
".
BREeT
5R4GY
FIG. 2
---Si9nal pafIl _to all "-..,;"
•• _._ •••• Signal pafIll'or frequMl:in a~ 'I'.4me
----- • •• • "/oW '1'." me:
switch 8-6, permits optional use of the limiter on <LIly
mode of operation when pulse type interference is
present.
Audio Fre<juency Amplifier - A resistance coupled
amplifier triode Y-16-B, amplifies
the audio frequency
signal from the detector.
Audio Output - The audio output tube Y -17, is
transformer coupled through asplit, balanced wind'ng
to deliver 2.5 watts undi.storted output to a600 ohm
load. The split balanced winding permits balancing of
the direct curreht in the output circuit,
as used for
teletype or similar .service. Aseparate secondary wind-
ing providell attenuated audio signal output for head-
phone operation.
This winding will deliver an output
of
15 milliwatts into an 8000 ohm resistive load when
the 600
ohm power secondary is delivering 500 milli-
watts to a 600 ohm resistive load.
IF Output - A cathode follower V-16-A provides
alow impedance source of intermediate frequency
(455 Kc) signal to the connector on the rear skirt of
the chassis.
RF Gain Control and Power Switch - The RF
g;lin control is provided for manual control of Ilenm-
tivity to prevent overloading on strong signals when
operatin,l?; with the Aye-MANUAL switch in the
"MANUAL" position. This control also operates
when
the switch is in the "Ave" position. The Powt:r
"ON -OFF" switch is operated at the counter-c1ockwi~e
extremity of the RF gain control.
Send·Receive Switch - The send-receive switch de-
sensitizes the receiver but leaves the power· "on" to
provide for instant reception between transmission
periods. Areceptacle is proVided on the rea.r
of the
receiver for the external connection of arelay.
Convenience
Ourlee -Aconvenience power outlet
is provided on the rear of the chassis for the connec-
tion
of an accessory such as alamp or electric clock.
Radiation -Advanced design and shielding of the
high frequency, second conversion crystal and beat
frequency
OlIciliators 'has reduced radiation to a
negligible point so
that interference of this nature,
common in multi-receiver installations,
is reduced to
aminimum.
7

III
INSTALLATION
Tubes and Packing-Inspect the cha..uis to ace tbt
aD tubes are 6rmly in their rupective sockets and that
any packing is removed (rom the recrivu.
Power Supply -Malee ~e that the pritnary tap
Iud on the power tnns(onner is connected to the
u'ul.fOfmc(" tap which rnO$t nearly agrees with the SO
to 60 cycle power source voltage.
Anrtnna - The input impedance at the antenna
terminals is designed to match a100 ohm transmission
lme:. The angle plug adapter and connector, supplied
with the receiver, is designed for use with asmall dia-
meter, "TWINAX" transmission line, which should
be: wed with abalanced antenna installation. If it l5
desired to operate with a!ingle win: antenna, the m'
tenna lead-in wire should be connected to one terminal
of the connector plug and aground lead should ~
CMnected from the other terminal of the connector
plug to the ground tuminal, which is adjacent to the
antttuu. input R:\:epcade at the rear of the tuning unit.
Speakn - The loud speaker mould be of the per-
manent magnet dynamic type and should include a
speaker voice
COil to 600 ohm line matching mns-
former for connection to the 600 ohm <ludic output
terminals of the receiver.
Headphones -
Either low or high imI:edance head-
phone" may be used in
the phone jack. The high im-
pedilnce type is recommended. The phone jack is lo-
ciUed at the fower left side of the front panel.
Mounting - The receiver may be placed on a ~ble
or mountw in astandard 19 inch rack... If atable model
is purchased, it is SlJpplied with asteel cabinet. The
cahinet ahould he placed in aposition which permits
the free access of air for the vcntibtion louvers.
IV
OPERATION
DESCRIPTION OF CONTROLS
The front panel dials and controls are shown in
Figure 1and the rear chauis skirt c:ontrolaand tennin-
ala are shown in Figure 6.
Tuning DiaI.s - The main dial is to !M left and the
~d ~prQd dial is to the right. The mUn dial haa aix
frtquency band acales, calihn.ted in mega.c.ydea and an
a.rbitrary, outer scale. The band spread dial hu an ar-
bitrary, 0
to 100, sc:a.Ie. The numeral under the find
pointer of the main dial indicates the number of rev0-
lutioN that have been made by the band sprad dial
at any setting.
Thus. if the painttl', for the aliter
scale, of the main dial indicates over the 6.gure 4and
the band spread dial indic:a.tea 87.6, the reading to log
for this setting is read, 487.6. This precise mechanical
bUllJ spread sy:;tem dividt3 the rotation of the main
dial over each frequency band into approximately 600
bilnd spread divisions, with one half diviaion calibra-
firm points. Slnce it is cur to estimate one tenth divi-
sions,
on the band apre:ad sale., this divides each fn:·
quUlCY band into apprcWm.:t.tdy 6000 readable set·
ting&. This prrmits extreme accuracy in the logging of
ltaticns..
CryNI Control1ed Hf o.dIIator -Por operation
on b:ed frequrncy channels the "fREQUENCY
CONTROL" is provilUd. The crysU..lJ are not: 1Up-
plied with the receivu, but will be supplied on ,pecial
order. In order to i~ correct crystal controlled
frequency operation crystal uniu should be or&red
from HAMMARLUNO MFG. CO. INC. and the
order should specify the &i~ frequency, for which
each unit is to be used. The frequency control unit
has provision for six crystals. Variable frequency op-
eration
or crysu.l contrOlled frequency operation on
any of
the six crystal positions is selected by the
"CRYSTAL SWITCH". The crystal osdllator is de·
agned for use with suitable crystals at any frequency
in the range
of the rtteiver Wove one megacycle. The
"DELTA fREQ" control is wed to compensate for a
very small plus or minw frequency tolerance of the
""..a.
The procedure for cry6tal frequency control opera-
tion ahould
be :as follows; l.oo&en the knl.l1'led thumb
screw on top of the cryaul unit and push the retainer
spring aSKmbly to the rear. Insert the crystal or cry-
stals in the crystal sockets, numbered 1 to 6. Bring the
retainer spring assembly forward so that the springs
press on top of
the crystal holders and t\tthten the
thumb screw. Mark
the signal frequency for which
each crystal was selected. in megacycles
on the plastic
chart provided for this pwpose illongside
the crystal
switeh. Pencil
or ink may be wed and can be era..sed
if it is dc.siced to change theK ligures at any time. The
numerals on the chart ahouJd be used to thil.t they
agree with
the numerals on the c:ryst:a.l aoc:ket positionJ.,
which an: a.1ao indicated by the crystal switch. The
main tuning dial should be let at the sign.aI frequency
for which operation is
desired. The crystal swrtm
$Aould be. set at the position corresponding to the
numba for that signal frequency on the chart. The
Delta Frequency control should be adjusted for maxi-
mum siRnal or for tero beat as required. It !hould he
noted
that this tuning adjustment of the Delta Fre-
quency cootrol must be made each time that the :;ig-
nal frequency U! changed and that the main tuning dial
should
be set to agree with the new signal frequency.

Tuning Lock-The tuning lock, located to the
right of the tuning knob, provides apositive locking
for the tuning mechanism without affecting the fre·
quency setting, when
it is desired to prevent accidental
shifting of the tunin~·or when the receiver is operated
under asevere condition of vibration.
Tuning Meter- The tuning meter at the upper
left on the front panel is useful in accurately tuning a
signal and provides an indication of the relative
strength of the received si~nal in db from 1microvolt.
The "METER AD] RP" control at the rear of the
chassis provides adjustment
of the plus 20 db reading
on
the RF scale, with a10 microvolt input signal. De-
pression of the "METER SWITCH" converts the
meter circuit for indication of the AF output power
level in db from 6miljiwilttll. Thill IIwitch is Ilpnng
returned to the RF scale circuit position when released
and should not be
depTe8lied for the AF scale unless
the audio
output bas been adjusted for low power out-
put, by means
of headphones or speaker. Failure to
abserve this precaution fUy re.<"\1lt in damage to the
meter. The "METER AD] AF" control at the rear of
the chassis provides adjustment
of the 0db reading on
the
AF scale, which should be made when the AF out-
put power from the 600 ohm audio output terminals is
6milliwatts or 1.9 volts across a600 ohm load.
Band Change- The large knob, to the left, is the
band change controL Each revolution of this control
turns
the turret, containing the RF and HF oscilla.tor
coil, trimmer and switch contact assemblies, from one
frequency band to
the next. The turret has no stops
and may be turned in either direction desired. A
posi-
tive detent machanism assures correct location of the
\'anous bands. The band change control simulta.ne-
ously operates
the small frequency ba.nd dial, loca.ted
at tht:: ct:nter uf
the panel anJ .uign" the Jial frequency
indicator with the proper f\C3.le.
SelectivitySwitch - The selectivity switch provides
three crystal and three non-crystal degrees of selec-
tivity, ranging from extremely sharp, for C'W recep-
tion, to broad for good fidelity Mewoperation. The
control knob dial indicates the 6db band width at each
setting.
Phasing Control - The phasing control permits
high attenuation
of closely adjacent channel interfer'
ence on either side of the signal frequency, when the
crystal selectivity positions are used.
Beat Frequency Oscillator - The beat frequency
o.scillator is turned "on" for C'W signal operation by
the
"MOD-CW" switch. The beat frequency dial
should be set at
xero for tuning- to .u:ro beat and then
adjusted to
~ve the desired audio pitch. The beat fre-
quency oscillator injection voltage is adjustable by the
"BFO INj" control on the rear skirt of the chassis.
Noise Limiter- The noise limiter switch is inde-
pendent of other controls and is useful in gready at-
tenuating noLse interference from ignition or similar
pulse type sources, regardless
of the mode of opera-
tion.
Send-Receive- The send-receive switch permits
desensitizing the receiver during transmission periods,
to prevent damage to
the receiver, when operated in
proximity
to the transmitter and provides instant re_
turn to reception between transmission periods.
Rday Receptacle - The relay receptacle, on the
rear of the receiver, is connected in parallel with the
send-receive switch and provides for the connectiorr of
an externally connected relay, to perform the send-
receive operation.
When the relay is used the send-
receive switch
is left in the "open" or "send" position.
AVC-Manual Switch
~ The AVC-Manual Switch
permits the choice
of either AVC or Ma.nual sensitiv-
ity operation as desired. The A VC has adelay bias,
which insures maximum sensitivity for weak "ignab.
RF Gain Control- The RF gain control provides
adjustment of the sensitivity for signals of various
strength,
when under the "manual" operating condi-
tion, in order that the receiver sensitivity may be ad-
justed to suit the signal strength and prevent overload-
ing.
This control is also in the circuit when operating
on
AVe, in order that the sensitivity may be adjusted
to reduce undesirable noise during "ojf" periods in the
transmission of the received signal. \Vhen it is de-
sired to use the tuning- meter for indication of relative
signal strength,
the RF gain control should be at maxi-
mum.
Audio Gain
Control- The audio gain control ad-
Justs the audio input to the audio amplifier tube. It
should be adjusted for the required audio output when
operating on
AVC and is best left at or near maximum
when operating on
MANUAL control.
Phono
Input-Terminals are provided on the rear
df the receiver for phonograph or other audio fre-
quency source input to
the audio frequency amplifier.
Convenience Ouder - A power outlet receptacle is
provided on the rear of
the receiver chassis for operat-
ing an accessory, such as an electric clock or lamp.
V
MAINTENANCE
This receiver is designed for continuous duty and
should normally require little attention beyond
the
replacement of tubes. However, lShould trouble de-
velop
that cannot be eliminated with new tubes, the
socket voltages and resistances should be measured to
chassis. Any a.ppreciable departure from the values
shown in tables Iand :2 will genenlly indicate the
"
component or circuit at fault.
Operating- and maintenance of the receiver will be
greatly facilitated if the contents of this instruction
manual are thoroughly digested. Approximate input
signal values for stage by stage gain checks are shown
in table
4.

TUBE SOCKET VOLTAGES-TABLE 1
Vol~e to chaW!. Mcuuremenu made with Weston Mood 661 Voh'()hmmetu, acept thoae indicated by
utt:rUk were made. with Musurements Corp. Model 62 VTVM. The 500 volt scale was used for all voltages
above 10 voltls and the 10 volt ecale for voltap below 10 volts. Line voluge 117, no ligna! input. Audio G~
control at minimum and CW-MOD switch on "ew-
SOCKET PlN NUMBERS
TUB! I1l•,•,•,MODE Of OPERATION
V·I
'-I
-
'6.3:1.c -
100
"---
RP Cain mu.
V·I '-Sol -
'6.h.c
-
'60
'"
---RP Cain ",jn.
V·,
'-I
-·6.3ac;, -
210 100
- - -RF Gain
lUX.
V·,
'-H
-
'6.bc -
'60
'40
---RF Gain
aiD.
V·l
-
-6.),c
---0-
'"
-RI' Gain
mu..-VFO operation
V·l
-'6.31.c: ---
Il0 -
,.,
-RP GJin mu...----CrysuI
Puq. Control
V·l
-
f6.hc:
---0 a 190 -RF Gain
!I.in.-Vl'O oJl4'~tion
V·l
-'6.3.c: --- 130
a
'00
-
R.P Gain min.-Cr,.stal flreq. Coouol
V·.
Ila
-'6.1i1c -
lIa
--- - RF Cain
lUI. or min.
V·,
-
,.,
·6.)ac
-
'40
110 ---
ItP Cain au. or min.
V·.
--
'6.)«
-m- '-I
--
RF Gain Ru.-Freq •. below 7... me
V·. --
'6.3ac
-
'60
- '-I
--RP Gain
nin.-Fer-qs. btlow 7."me:
V.,
-- '6.3.c - 22l
"
'-I
--RP
Gun 1IU.x.-FnQ.s. above 7."me
V·,
-- -6.3ac -26a IOl '-I
--RF,Cain
min.-Freqs. abo"" 7."me
V·, --11
-
·O.llc -
'"
".
---RP Oil;"
muc.-Preqa. below '."mo;
V.,
$-11 -
$6.31.c
-26a .90
---RP Gain
min.-Freqa. htlow 7."mc
V·,
$-lL
-
$6.31.c
-m0---RF Cain
1IIu.-Freqa. above 7."mc
V.,
$-11 -
$6.hc
-160 0---RP Gain 1Ilia.-Prfll&.
aho~ 7.4mc
V·. 0-$6.1ac -•----Prcqucnae. bel
...... ?"me
V.,
la
-
$6.3«
- la
----
Frequendu above '... mc
V·,
'-I
-
$6.3«
-
'0'
"---RP
G~in DI.L
V·,
$-H
-
$6.3a.c.
- '60
2ll
---
RP Gain Jnin.
V·IO
,-,
-
$6.be
-20' ..
---RP Cain mas .
V·IO
--H
-
$6.3i11c
-
'60
m---RP Gain
miOl.
V-II --11
-$6.3Ic -
110
I"
-- - Rf elin mu.
V·II
$-11 -
$6.3i11c
- Ha
I"
-- - RP Gain lJIin.
V.12 --$6.3
.. "- 11. .."
---RP Cain mo.-BFG Tnj"e:tion mn.
V·U --$6.3ac -240 "--
-- RoP Gain min.-BFO Injection mn:.
V·U
"-$6.11" -"- - --RF Gain
mall:. Of. min.
V·l .. -- $6.hc
-'" --- - RP Cain
mu. Of min.
V•
.,
--
$6.3i11£
---- - -RF Ow lDiIIX. (If min.
V·16
,a
-u--210 - ...
-6.3ac Rf' Gaill
CllU.
V·I6
"-
1.'
--
'40 -,
.•
$6.3Ic RF
Cw min.
V·17
--
'60
m--
-6.h.e
12 -RF Gain laU.
V'17
--
'80
16l
--
-6.be
1l - R.P Gain miD.
V·II
.SO
---13a ----RF Cain
mu:. or min.
V'19
-
lOO
-----
'00
-RP Gain
mu.-$) V.Ie Pin 2 to Pin"
V·19 -31a - - ---
31.
-
RP Gain mln.--' Va.c Pin 210 Pin 8
V·10 -
'-', $6.3ac ---
$-96
--
RF Cain max.
V·l0
-
$-9?
-6.3ac -
$-97
RP Cain min.
JO

TUBE SOCKET TERMINAL RESISTANCE-TABLE 2
Resistance to chassis. Measurements made with Weston Model 663 Volt-Ohmmeter.
Tube removed from socket under measurement. Audio Gain Control at maximum. RF Gain Control at mini-
mum.
Limiter Switch "OFF', CW·MOD Switch on "CW". AVe-MAN Switch on "AVe".
SQcket
Pin No. 23,67,,MODE OF OPERATION
Tube
Socket
V-I l.8M 0 0
<OK 80K 0
V_,
l.8M 00
<OK 80K 0
V-3 0 0
"K
0 <6K
'6K
Crysb.l Freq. control pos. t-<i
V-' Inf. Inf. 0Inf. "K
0Crystal Freq. control
pos.
1-6
V-'
<OK lnf. 0 In£.
"K
0
VFO Operation
V-l
"K
130 0 <OK 13K
'OOK
V-6 21K 0 0
<6K Inf.
lOOK Frcq. Bands below '.4me
V-6
21K 0 0
<6K 10K lOOK
Frcq. Bands above '."me
V-7
llsK 0 0
<6K InE. 0Frcq. Bands above 7.4mc
V-7 llSK 00
<6K 80K 0Frcq. Bands below
7.4me
V_,
0Inl.
21K aFrcq. Bandt below 7.4me
V-'
0lSOK
21K aFreq. Bands above
7.4me
V-'
UM 0 0
52K 80K 0
V·1O I.3M 0 0
52K 80K
a
V·1l 12SK
00
<OK lOK
0
V·12 0 0 0
<OK
HSK
•
·0 to IK (BFQ Injection control)
Y·13 019SK
lOOK
a
V-I-4- 0 770K 0 16K 0220K
V·I'
.. KInf. 0 In£.
0 nOK
V-16 1S0K lOOK IK 0 0
<6K
"70K
680
V-17 0 0 <6K <6K
.70K Inf. 360
V-18
U8K
78K 0
V·19
<6K
0 l5 l5
<6K
V·20 lOK 6lK 0 SOK
06lK
/I

VI
ALIGNMENT
'The alignment of a modem communications re-
ceiver requires p~dsion instruments and athorough
knowledge of the circuiu involved. This receivu, be-
mg adouble ruper-heterodyne, the alignment proce-
dun is ~ven more involved than is USlal.
Uncke Ronnal service the receiver will stay in alill:n·
ment
for extremely long periods of time, consequrntly
realip:nment should not be attemptw. unle.ss .1.11 other
pouible awes of a puticular trouble lave hem elim-
inated. When it hu been detumined that any realign-
ment should be attempt~ agreat deal of caution
should be. aercised in ma.king th~ adjmtmenu. as any
required readjustment should not cowl mo~ than a
5light angular motion of the adjusting screw.
ALIGNMENT OF THE IF STAGES
The low frequency IF should be aliiflcd nrst. The
recommended method for aligning the low frequency
IF involves the use
of asweep frequency signal gen-
er.uar and an oscilloscope. Since these instruments are
not avaib.ble at the averai:e service stiltion the alter-
nate mrthod using an amplitude modulated signal ~en
crator and an output meter will be descnbed £rn.
The additional information ttquired for the visual
i1lignment method wilt be covered in alater pangnph.
The signal g£nerator .should be coupled to the grid
of the mixer tube VS th.rough ac:lpilcitance of ap-
proximately .0 Imfd. Aminiature tube adapter will
be required 10 milke the mixer grid connection avail-
able. Such an ildapter is manufactured by the Alden
Manufacturing Co. An output meter should be con-
nected across the output terminalll of the receiver or
the speaker voice coit. The receiver controla .mould
now be let aI follow,,:
The signal generator should be modulated 30 per-
cent at .400 cycles. Tum the selectivity switch to the
3kc position and advance the RF Gain control to
maximum. Set the signal generator frequency to 455
kc and adjust its output untit some deflection is noted
00 the output meter. Rdu to figure 3 for the Ioation
of the v:uious :IIlignm~t u1justmUits. Adjust L.n.
LH, Ll9, L38, L36 and Ll2 for maximum output. re-
ducing the signal Jiil:enerator output U1d the RF Gain
control urequired to prev~t overload or excessive
output. Now tum the Icleetivity switch to the narrow-
est position, .2 Ite. and .djuat the sillm.l gene-rator fre-
quency for the muimum output. This establishes the.
correct signal frequalCY by the 455 lee crystal for the
IP amplifier and the frequency of the siKnal R;tnen..tor
should not be disturbed for the remainder of the low
frequency IF alignment, unless it should be to recheck
this establishment of cryltal frequency to make sure
that the signal generator frequency hou not drifted
during the alignment. The selectivity switch is now
Control
ScJectivity
Send -Rc:ei ... -e
CW-Mod
Phasing
AVC-Mm
Audio Gain
RP Gain
Band Switch.
0;.1
Posibon
Stt tat
Receive
Mod
Arrow
M",
Set for ilpprox.. 10 volts
Stt t<n
US -3.45 mc
2.5 me
turned to the 3 kc position and L42. L41. L39. U8.
L36 and L32 are again adjusted for maximum output.
Now tum the selectivity switch to tbe 1.1 Icc po!;tion
and adjust L37 for maximum output. Before. chang-
ing this set·up the BFO should be turned on by throw-
ing the CW-Mod switch to CW and checked for 1;UO
beat with the BFO knob diiil at its uro reading. If
necessary L44 should be. adju5ted for zero output. 1'h.UI
check and adjustment of the BFO should be done with
the signal generator carrier unmodulatcd.
Th£ procedure for the visua1 m£thod of aligning the
low frequency IF should be the I!ilme as the above ex-
cr.:pt that the adjustments are m:llde for both maximum
amplitudr.: and coincidence of. the oscillolcope images.
The oscilloscope vertical input should be connected
acro" the diode detector load resistance. from the
junction of R64 and R65 to chassis.
The high frequency If should be aligned next. Set
the band switch to the 7.4 -14.8 me band. The st.-
l«tivity switch should be in the 3 Itc position. Adjust
the signal genelOl.tor frequency to 3.955 tnc and adjust
L31, LB and L34 for maximum output.
The 3.05 me cry5ta1 used in the secood osallator is
held to avery dose frequency tolerance. However, if
it is desired that WI oscillator frequency be exactly
3.5 me to permit its we as afrequencY standa.rd, as
hereinafter described, this may be accomplished by
adjusting capacitor CIOI, underneath the chusis. The
exact procedure is as follows; Set the receiver to 7.0
mc on the 3.45 -7.4 me band. Temporarily connect,
by means of ajumper, the center and the open tennin-
als on llwitch 54 at the rear of the tuning unit. Attach
atwo foot length of insulated wire to the antenna
tuminal and dress the free end around the tube shield
on the 3.S me oscillator tube V8 with the CW-Mod
switch on CW rock the tuning control slightly until
a beu note is heard in the headphones or speaker.
Now throw the CW -Mod switch to Mod and
couple a1.0 mc frequency .!.ta.ndard to the antenn], in-
put tenninal. Adjust ca.pacitor ClOI for urn beat.
R'emove the jUlrlper from 54 and remove the two foot.
test lead. If appreciable adjustment of CtOI was ~
quired it is advisilble to repeat the high frequency IF
alignment.
The 3.5 me oscill",tor mOlY now be uled all afre-
quency standard at multiples of 3.5 mc from 10.5 me
upwards, by temporarily connecting the two foot
tength of wire <l.S deacribed above.

ALIGNMENT OF THE RF AMPLIFIER & HF OSCILLATOR
To adequately align the RF Amplifier and HF Os-
cillator an accurately calibrated signal generator and
an
output meter are required. The frequencies re-
quired are shown in table
3. The location of the ad·
justments is shown in Figure
3. The use of Table 3
Uld Figure 3should be made in following this part of
the alignment which will now be described for one
frequency band.
The same procedure should then be
followed for the other frequency bands.
To align the .54-1.35 me band the signal generator
is coupled to the antenna input terminal through a
100 ohm carbon resistor.
The generator should be
modulated
30 percent at 400 cycles and the output
meter connected acl"Olls tne fcceiver output terminals.
The receiver controls should be set as follows:
Control
Selectivity
Send-Receive
CW-Mod
AVC~Man
Audio Gain
RF Gain
Band Switch
Limiter
Position
Jkc
R.et:eive
Mod
See Text
Set for approx. 20 volts
See text
set for band to be aligned
off
Set the receiver and signal generator dials to .56 me.
The RP Gain control should be set at maximum and
the AVe -Man .switch set on Ave. The HP Osc. L
adjustment shown
in Pigure J, should now be set for
maximum output. Then the Ant., 1st RF and 2nd RF
L adjwstment:.!l .mould be set for maximum output. The
receiver and signal generator dials are now set to 1.3
me and the eadjustments, shown in Figure J, should
be adjusted for maximum output in the same order,
beginning with
the Osc Cadjustment and then mak-
ing the eadjustments for the Ant, 1st RF and 2nd
RF.
This procedure should be carefully repeated un-
til no increase in output can be realized. The Ave-
Man switch should then be set to Man and the signal
generator should be set for approximately :3 micro
volts. The Land eadjustments should now be
checked for maximum output, adjusting the RP Gain
control as found necessary
to maintain the output at
approximately 20 volts.
Following the frequencies, shown in Table 3, align
the remaining bands using the same procedure as
above.
TABLE No.3
RF AND HF OSCILLATOR ALIGNMENT FREQUENCIES AND ADJUSTMENT DESIGNATIONS
FREQ. BAND
INMC
.H-1.35 1.35-3 .. 45
3.45-7.'" 7 .... -+U
14.8-29.7
29.7-''''.0
RF fS HF OSC
ADJUST LAT.
.56 1.. 3.75
7.'
13.0 10.0
RF fi HF OSC
ADJUST CAT.
1.3
3.'
7.1S H.S 29.0 S2.0
TABLE No.4
APPROXIMATE SIGNAL INPUT AT IF '" loP STAGES FOR 20 VOLTS OUTPUT
Output measured acroas a600 ohm resistive load at output terminals of receiver. RP signals modulated
30 percent at 400 cycles. Signals applied to tube grids through a .01 mfd capacitor. Selectivity switch at 3 kc
AVe-MAN switch on MAN. CW-MOD switch on MOD, RP Gain and Audio Gain at maximum.
BAND SWITCH
FREQUENCY INPUT TO
APPROX. INPUT
My Audio -400 cyda Pin S, V17 l.'
~I.
A,y
Audio .0400 cycles Pin 2, V16B
.J ~I.
1.35-1 . .045 me: Mod RF .455 k" Pin 1. Vll .35 volts
US-1 . .04S me
ModRF.04SS h:
Pin I, VIO 6000 miC1'ov())ts
1.3S-3 . .045 me
Mod RF "''' ke
Pin I, V9
110 microvolts
1.3S-3."'5 me ModRF .o45S k.e Pin 1, V7
-40 miel'OV(llts
1.3'-3.45 me
Mod RF 4" Ite
Pin 7, V,
6' mierovoltl
7."'0-'.04.8 me Mod RF 3.95S me Pin 7, VS
.040 miel'OV(llts
7. .040-1.04.8 me ModRP 1.955 me
Pin 7, V6
150 microvolts
13

ee
e[]8
8v
'\
T8
ee@
1"'-
/
0
~c
e
GND
0
L41 L42
ANT
0
OT50
L
~
0c
.3
e0
\.
,/
I LM L331
15
ona
@~
L38 L39 00
OT40
L32
Ctot 00
r-----~;) "",
2R
OOOOOgl
',0
T'
000000
®',0
000000
lee!
0)~
L3'
123456
L: ________ ~
00
L37 L38
00
OT30
@He0
a
8? L44
TOP VIEW OF CHASSIS
SHOWING ALIGNMENT ADJUSTMENTS
riG. 3
• AUDIO AND OVERALL FIDELITY CURVES·
5
CURVE - Audio frequency amplifier. Input to phono terminals.
--------- CURVE -Owroll fideliiy at 2.5 mc. Modulation 30 percent.
Selectivity switch in 13 kc position.
RF Gain set for 20 volts output at 400 cycles.
Output measured across Q 600 ohm resistive load.
Audio gain control 01 maximum for both curves.
m,ooo
<000
CYCLES PER SECOND
F'IG.4
'00
-,
:y
5
o
ai
c
z

•SELECTIVITY CURVES
Overall at 2Megacycles.
1
NUMBERS DENOTE SELECTIVITY SWITCH POSITIONS
i.2 AND 3 NON CRYSTAL - 4,5 AND 6 CRYSTAL
2 3 456 654 3 2
0
I-IIt
III
III
11111
tN-
,
I
~
....
J
10
too
iOO 1
w
u
Z
<t
Z
o
13
a::
13
::E
;::
115 10
505
KC OFF RESONANCE
FIG.S
10 15
/5

VII
CONVERSION OF TABLE
MODEL RECEIVER FOR RACK MOUNTING
The SP·600 Receiver is designed for either table
nbinet or IOlck mountinll_ When uble. models are
ordered, the receiver is r.ot supplied with •bottom
'Cover p~te since the cabinet serves this purpose. When
nck models are ordered the receiver is supplied with
il bottom cover plate, but is not supplied with atop
cover pla.te since in most ~ses the rack. is of the cab-
inet type.
Acover plate kit is provided. on separa.te order, for
conversion (0 rack mounting where table moods have
been ordered and where the covers are desired.
The following inSUUctions should be followed when
insu.lling the cover kit; To install the bottom cover
piau, remove the two
rtar corner nul: plate bad:ets
by removing the three .screws at the lower rear ends
of the JarK"t side mountinr brackets and replace these
two nut plate brackets with the two slightly shorter
one! from
the kit, using the same ~ws. Remove the
nut and lockwamer from the screw, nearest the bot,
tom edge
of the chassis, holding capacitor C1St (see
bottom of chassis photograph). Insta.ll the short angle
bracket, from the kit, using
the same screw from
which the nut a.nd washer were removed. with the
ta.pped (smaller end) of the bracket replacing the nut.
The bottom CQver plate is now installed using the five
10,32 screws from the kit iUld the two lO'32 screws
that previously held the bottom of the receiver to the
cabinet. To in.so.lI the tOp cover plate assembly, place
the cover with tbe angles being downwa.rd. to~rd the
&:husis and with pressure applied at the rear of the
plate. to Migbdy compress the rubber channel against
the rear of the front panel, .secure the auembly in
place with the four 6-H 5(:r~$ from the kit, engaging
them in the tapped holes in the brackeu through the
dearance holes In the side mounting bn.ckets.
'0

TABLE No.5
PARTS LIST
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, 45, 75,
lIO, 112, 113
C37. 57, 61
C39, 59, 99, 134
C60,88
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, 147.
148, 156, 157
CtOI
CUI
ell4
C119,125
e120,126
el2a,lSt,ISS,
159, 160
C129A, 12gB,
IS2A,152B
el30
Cl3I,133
CI37
C140
C141,142
C143, 149
C144
elSO
C161A, B. C
El
DESCRIPTION
Capacitor, variable,
S sections .
Capacitor, .01 mfd .
Capacitor, 20 mmf .
Capacitor, 2400 mmf .
Capacitor, 33 mmf .
Capacitor, 1500 mmf.
Capacitor,7 mmi .
Capacitor, 1000 mmf .
Capacitor, 15 mmi .
Capacitor, 100 mmf .
Capacitor, 85 mmi .
Capacitor, 51 mmf .
Capacitor, 12 mmi .
Capacitor, 2200 mmf .
Capacitor, 39 mmf .
Capacitor, variable .
Capacitor, 220 mmi .
Capacitor, 3300 mmf .
Capacitor, 404 mmi .
Capacitor,S mmi .
Capacitor, 810 mmi .
Capacitor, 10 mmi. .
Capacitor, 1200 mmi .
Capacitor, 120 mmi .
Capacitor, 190 mmf .
Capacitor, 92' mmf .
Capacitor, 51 mmf .
Capacitor, 379 mmf .
Capacitor, 42 mmi .
Capacitor, 610 mmf.
Capacitor, 65 mmi .
Capacitor, .022
mid .
Capacitor, variable .
Capacitor, variable .
Capacitor, 270 mmf .
Capacitor, 300 mmf .
Capacitor, 1300 mmi .
Capacitor, 10 mfd, 100V
HS C;I,n, El~ctrQlytic.
Capacitor, 2x.05 mfd
HS Can, Paper .
Capacitor, 27 mmf .
Capacitor, 430 mmi .
Capacitor, .25 mid 200V.
Capacitor, 100:1 mmi_
Capacitor, 100 mmi .
Capacitor, 5100 mmi .
Capacitor •. 05 mid ..
Capacitor, 2500 mmf
800V ... ,.... . ....
Capacitor, 3 x 20 mfd
450V. HS Can. Elec-
trolytic .
2
Screw Terminal, Phone
Input, .
Hammarlund
Part No.
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
17
Symbol
Designations
E'
&3,4,5,6
E7
EO
E9, 10,11, 12
E13,H
E15, 16
E17
E18
Fl
n
J4,5
Ll
L2
L'
L.
L5
L7, 14, 24, 35
LO
L'
LIO
LU
LI'
DESCRIPTION
4 Screw Terminal, Audio
Output .
Dial Lamp, No. 47
]4azda .. , ..
Dial Lamp Socket
Assembly .
2
Solder Term. strip .
1
Solder term. strip
(Jeft) .
1
Solder term. strip
(right) .
6
Solder term. strip .
8
Solder term. strip .
15
Solder tenn. strip .. ,.
3 Solder term. strip
(meter) .
Fuse, 3Amp .
Fuse Holder .
Fuse Holder, Spare .
Antenna Input Socket..
IF Output Socket .
Phone Jack , .
Power or Relay
receptacle .
RF Input usembly, in-
cludes C2. 3, Ll and
Switch contacts for
SIA .
RF Input assembly, in-
cludes C4. 5. L2 and
Switch contacts for
SIA .
RF Input assembly. in-
cludes C6, 7. 8, L3 and
Switch contacts for
SIA .
RF Input aSlIcmbly, in-
cludes C9, 10, 11, L4
and Switch contacts
for SIA .
RF Input assembly, in-
cludes C12. 13, 14, L5
and Switch contacts
for SIA .
RF Input assembly, in·
dudes CIS. 16, 17, L6
and Switch contactl
for SIA .
RF Choke, 192 micro·
henriel ..
RF TranlfClrmer assem·
sembly, includes C26,
27,
LB, R1 and Switch
contacts ior SIB .
RF Transformer assem-
bly, includes C28, 29,
L9, R8 and Switch con-
tactl for SiB .
RF Transfarmer assem-
bly, includes C30, 31,
32, LI0 and Switch
contacts fQr SiB .....
RF Transformer assem·
bly, includes C33, 34,
35,
Lll. RIO and
Switch contacts for
SIB .
RF Transformer assm·
bly, includes C36, 37,
L12
and Switch con-
tacts for SIB .
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

PARTS LIST (Continued)
Symbol
Designations
DESCRIPTION
Hammarlund
Part No.
Symbol
Desirnations
DESCRIPTION
Hammarlund
Part No.
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
"'
RF Transformer assem-
bly, includes e38, 39,
LI3 and Switch con-
tacts for SIB .
Same all LB, includes
C<46, 47, LIS, Rl1 and
Switch contacts for
SIC .
Same as L9, includes
C48, 49, L16, RI8 and
Switch contacts for
SIC .
Same a. LIO, includes
eso, 51, 52, Ll1, Rig
and Switch contactlJ
for SIC .
Same all Lll. includes
C53, 5-4, 55, LIB, H2O
and Switch (;onta~s
for SIC .
Same as L12, inc1udcli
C56, 51, L19 and
Switch contacts for
SIC .
Same as LI3, includes
e58, 59, L20 and
Switch contacts for
SiC "
RF Cboke, 1 millihenry
RF Choke, 10 millihen-
ries .. , .
RF Choke, 25 mUlihen-
ries .
HF Osc. alsembly, in-
cludes C76, 77, 78,
L25 and Switch con-
tacts f(X" SID .
HF Osc. assembly, in.
dudes C81, 82, L26
and Switch contacts
for SiD .
HF Osc. assembly, in-
cludes C83. 84, 85,
L27 and Switch con-
tact$ for SID.
HF Osc. assembly, in-
cludes C86, 87, 88, 89.
L28 and Switch con-
tacts for SiD .
HF Osc. assembly in-
cludes C90, 91, 92, 93,
L29 and Switch con-
tacts for SID .......
HF Osc. assembly, in-
cludes C94, 95, 95, L30,
and Switch contacts
for SID .
RF Choke, 3.8 millihen·
ries .
RF Choke, 2 ohms de .
RF Choke, 2.7 ohms de.
Ist Filter Choke 8.5 Hy,
170 ohms dc .
2nd Filter Choke 20 Hy,
+40 ohms dc .
Tuning Meter .
Power plug and cord.
Antenna Input Plug.
Antenna Adapter Con-
nector _
Cable Connector Plug
(for }2) ....
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
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, 105,
106,107,108,
109,110
R5, IS,
32
R7,8, 17, 18
R9,19
RIO, 11,20,21,
"
R22, 23, 64. 65.
71
R24,25
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, 95
R87,88
R93
/8
Resistor S10K ohms !1
watt 19317-76BF
Resistor 10K ohms Y2
watt 19309-278BF
Resistor 33K ohms 7'2
watt 19309-262BF
Resistor 1000 ohms n
watt __ .. .. .. 19309·49BF
Resistor 510 ohms %
watt . .... 193og_170BF
Resistor 51 ohms n
watt 19309_193BF
Resistor 24 ohms 7'2
watt .... ,.......... 19309.189BF
Res;stor 22 ohms Y2
watt . .. .. 19309-9BF
Resistor 47K ohms 7'2
watt 19309-89BF
Resistor 180 ohms 7'2.
watt......... 19309-31BF
Resistor 150 ohms tii
watt ..... ,........... 19309.259BF
Resistor 6800 ohms 7'2.
watt ..... , ..... ,..... 19309-69BF
Resistor 2200 ohms 7'2
watt ..... ,...... ..... 19309·57BF
Resiaor 1500 ohmlJ 7'2.
watt........ . ... ..... 19309-53BF
Resistor lOOK ohms Yz
watt ..... _. ... 19309_97BF
Resistor 22K ohms 7'2
watt... .. .19309-178BF
Resistor- 20K ohms 1
watt............ ..... 19310-179BF
Resistor 10 ohms 7'2
watt........ . .... .... 19309-IBF
Resistor 100 ohms Yo:
watt . .. ........ 19309-2SBF
Resistor- 2200 ohm. 1
watt. .19310-57BF
Resistor- 1 megohm ~
watt ' .. .19309-12IBF
Resistor 27K ohms 7'2
watt. ... .. ....... .. . . 19309-83BF
Resistor 18K ohms tii
watt... .19309.79BF
Resistor variable 1000
Ohmli 15363-1
Resistor- 20K ohms 7'2.
watt. .. .19309-218BF
Resistor 5CK ohms 1
watt...... .. 1!)310-18CBF
Resistor 470K ohms y,;
watt ......... .. 19309-113BF
Resistor 680 ohms y,;
watt...... .19309-45BF
Resistor variable 500K
ohms 15342-11
Resistor 2500 ohm 10
watts 19396-1
Resistor 82K ohms tii
watt . .. 19309-287BF
Resistor 120K ohms !1.
watt 19J09-181BF
Resistor variable SOK
ohms includes switch
S10 15342-21

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 ohms Y2
watt "
Resistor 3.3 me,ohms
Yz watt .........•..•.
Resistor 360 ohms 1 watt
Rellistor vil.riil.ble 25K
ohms .," "." .
Switch, bue and sprine:
assembly .
Crysal selector switch.
Crystal switch .
Swit~h. ~onver1lion
sWltchmg .
Selectivity switch, 3 set-
tion .
TonIe Switch SPST ..
Toggle Switch DPST ...
Toggle Switch DPDT.
Switch "ON-OFF" part
of R93 ....
Switch, DPDT, spring
return .
Mixer plate coil assem·
bly, includes C67, 69,
70, L31, 32, R31. "
IF Transformer assem-
bly, includes C97, 93.,
99, L33, 34, R35 .
Crystal Filter assembly,
includes CI07, 110,111,
112,
113, 114, L36, 37,
R41, Ya .
IF Transformer, includes
C1I7, 118. 119, 120,
L38, 39, 40, R49., ....
Same as T4, includes
C123,
124, 125, 125,
L41, 42. 43, R54 .....
Beat Frequency Osc.
assy., includes Cl3Il,
131,
132, 133. 134, L44.
45. 46. R76, 77 .
Transformer, Audio
Output ,.
Transformer. Power .
Tube socket. miniature.
Tube socket. octal
Hammarlund
Part No.
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
31183_01
31116-01
31114-GI
31102-01
31102-Gl
31106-01
31029-2
31086-2
15989.4
16082-1
/9
Symbol
Designations
X4
XS
X16
X2l
Vl,2,3,4.5,6
Y7
Y8
Miscellaneous
DESCRIPTION
Tube socket, miniature,
ceramic, less center
shield .
Tube socket, miniature,
ceramic, with center
shield .
Tube socket. "Noval" ..
Crystal socket, ceramic,
for crystals VI to V6
Crystal, order special,
specify
signal fre-
quency .
Crystal, 3.5mc ..
Crystal, 455kc .
Wrench, set screw No.6
Wrench. set screw NO.8
Wrench •• et screw No. 10
Snap Button Plue _
Shaft Coupling, riiid.
Shaft Coupling. flexible,
soft .
Shaft Coupling. flexible.
stiff .
Spring, retainer for RF
coil assemblies .
Sprinl, retainer for RF
coil .
Sprine. grounding for IF
transformer shields
Spring, conversion
switch .... .... ..
Spring, indicator slide.
Spring, band change
detent .
Knob. frequency control
Knob, tuning lock .
Knob &: Skirt (larle) .
Knob &: Dial (RF O .. in)
Knob &: Di..l
(Audio Gain) .
Knob a: Dial
(Crystal Phasing) ...
Knob a: Dial
(Beat Frcq. O.e.) ....
Knob a: Dial
(Selectivity) .
Chart, frequency control
Spring. anti-backb.lih ...
Hilmmarlund
P,.rt No.
15989·5
15989-3
16100-1
16092-5
31473-stlec.
31130·1
31471-1
11806·2
11806-3
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

,
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-
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..
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